The S-Lang C Library Reference John E. Davis Jul 4, 2018 ____________________________________________________________ 1. Functions dealing with UTF-8 encoded strings 1.1. SLutf8_skip_char Synopsis Skip past a UTF-8 encoded character Usage SLuchar_Type *SLutf8_skip_char (SLuchar_Type *u, SLuchar_Type *umax) Description The SLutf8_skip_char function returns a pointer to the character immediately following the UTF-8 encoded character at u. It will make no attempt to examine the bytes at the position umax and beyond. If the bytes at u do not represent a valid or legal UTF-8 encoded sequence, a pointer to the byte following u will be returned. Notes Unicode combining characters are treated as distinct characters by this function. See Also SLutf8_skip_chars, SLutf8_bskip_char, SLutf8_strlen 1.2. SLutf8_skip_chars Synopsis Skip past a specified number of characters in a UTF-8 encoded string Usage SLuchar_Type *SLutf8_skip_chars (u, umax, num, dnum, ignore_combining) SLuchar_Type *u, *umax; unsigned int num; unsigned int *dnum; int ignore_combining; Description This functions attempts to skip forward past num UTF-8 encoded characters at u returning the actual number skipped via the parameter dnum. It will make no attempt to examine bytes at umax and beyond. Unicode combining characters will not be counted if ignore_combining is non-zero, otherwise they will be treated as distinct characters. If the input contains an invalid or illegal UTF-8 sequence, then each byte in the sequence will be treated as a single character. See Also SLutf8_skip_char, SLutf8_bskip_chars 1.3. SLutf8_bskip_char Synopsis Skip backward past a UTF-8 encoded character Usage SLuchar_Type *SLutf8_bskip_char (SLuchar_Type *umin, SLuchar_Type *u) Description The SLutf8_bskip_char skips backward to the start of the UTF-8 encoded character immediately before the position u. The function will make no attempt to examine characters before the position umin. UTF-8 combining characters are treated as distinct characters. See Also SLutf8_bskip_chars, SLutf8_skip_char 1.4. SLutf8_bskip_chars Synopsis Skip backward past a specified number of UTF-8 encoded characters Usage SLuchar_Type *SLutf8_bskip_chars (umin, u, num, dnum, ignore_combining) SLuchar_Type *umin, *u; unsigned int num; unsigned int *dnum; int ignore_combining; Description This functions attempts to skip backward past num UTF-8 encoded characters occurring immediately before u. It returns the the actual number skipped via the parameter dnum. No attempt will be made to examine the bytes occurring before umin. Unicode combining characters will not be counted if ignore_combining is non-zero, otherwise they will be treated as distinct characters. If the input contains an invalid or illegal UTF-8 sequence, then each byte in the sequence will be treated as a single character. See Also SLutf8_skip_char, SLutf8_bskip_chars 1.5. SLutf8_decode Synopsis Decode a UTF-8 encoded character sequence Usage SLuchar_Type *SLutf8_decode (u, umax, w, nconsumedp SLuchar_Type *u, *umax; SLwchar_Type *w; unsigned int *nconsumedp; Description The SLutf8_decode function decodes the UTF-8 encoded character occurring at u and returns the decoded character via the parameter w. No attempt will be made to examine the bytes at umax and beyond. If the parameter nconsumedp is non-NULL, then the number of bytes consumed by the function will be returned to it. If the sequence at u is invalid or illegal, the function will return NULL and with the number of bytes consumed by the function equal to the size of the invalid sequence. Otherwise the function will return a pointer to byte following encoded sequence. See Also SLutf8_decode, SLutf8_strlen, SLutf8_skip_char 1.6. SLutf8_encode Synopsis UTF-8 encode a character Usage SLuchar_Type *SLutf8_encode (w, u, ulen) SLwchar_Type w; SLuchar_Type *u; unsigned int ulen; Description This function UTF-8 encodes the Unicode character represented by w and stored the encoded representation in the buffer of size ulen bytes at u. The function will return NULL if the size of the buffer is too small to represent the UTF-8 encoded character, otherwise it will return a pointer to the byte following encoded representation. Notes This function does not null terminate the resulting byte sequence. The function SLutf8_encode_null_terminate may be used for that purpose. To guarantee that the buffer is large enough to hold the encoded bytes, its size should be at least SLUTF8_MAX_BLEN bytes. The function will encode illegal Unicode characters, i.e., characters in the range 0xD800-0xFFFF (the UTF-16 surrogates) and 0xFFFE-0xFFFF. See Also SLutf8_decode, SLutf8_encode_bytes, SLutf8_encode_null_terminate 1.7. SLutf8_strlen Synopsis Determine the number of characters in a UTF-8 sequence Usage unsigned int SLutf8_strlen (SLuchar_Type *s, int ignore_combining) Description This function may be used to determine the number of characters represented by the null-terminated UTF-8 byte sequence. If the ignore_combining parameter is non-zero, then Unicode combining characters will not be counted. See Also SLutf8_skip_chars, SLutf8_decode 1.8. SLutf8_extract_utf8_char Synopsis Extract a UTF-8 encoded character Usage SLuchar_Type *SLutf8_extract_utf8_char (u, umax, buf) SLuchar_Type *u, *umax, *buf; Description This function extracts the bytes representing UTF-8 encoded character at u and places them in the buffer buf, and then null terminates the result. The buffer is assumed to consist of at least SLUTF8_MAX_BLEN+1 bytes, where the extra byte may be necessary for null termination. No attempt will be made to examine the characters at umax and beyond. If the byte-sequence at u is an illegal or invalid UTF-8 sequence, then the byte at u will be copied to the buffer. The function returns a pointer to the byte following copied bytes. Notes One may think of this function as the single byte analogue of if (u < umax) { buf[0] = *u++; buf[1] = 0; } See Also SLutf8_decode, SLutf8_skip_char 1.9. SLutf8_encode_null_terminate Synopsis UTF-8 encode a character and null terminate the result Usage SLuchar_Type *SLutf8_encode_null_terminate (w, buf) SLwchar_Type w; SLuchar_Type *buf; Description This function has the same functionality as SLutf8_encode, except that it also null terminates the encoded sequences. The buffer buf, where the encoded sequence is placed, is assumed to consist of at least SLUTF8_MAX_BLEN+1 bytes. See Also SLutf8_encode 1.10. SLutf8_strup Synopsis Uppercase a UTF-8 encoded string Usage SLuchar_Type *SLutf8_strup (SLuchar_Type *u, SLuchar_Type *umax) Description The SLutf8_strup function returns the uppercase equivalent of UTF-8 encoded sequence of umax-u bytes at u. The result will be returned as a null-terminated SLstring and should be freed with SLang_free_slstring when it is nolonger needed. If the function encounters an invalid of illegal byte sequence, then the byte- sequence will be copied as as-is. See Also SLutf8_strlow, SLwchar_toupper 1.11. SLutf8_strlo Synopsis Lowercase a UTF-8 encoded string Usage SLuchar_Type *SLutf8_strlo (SLuchar_Type *u, SLuchar_Type *umax) Description The SLutf8_strlo function returns the lowercase equivalent of UTF-8 encoded sequence of umax-u bytes at u. The result will be returned as a null-terminated SLstring and should be freed with SLang_free_slstring when it is nolonger needed. If the function encounters an invalid of illegal byte sequence, then the byte- sequence will be copied as as-is. See Also SLutf8_strlow, SLwchar_toupper 1.12. SLutf8_subst_wchar Synopsis Replace a character in a UTF-8 encoded string Usage SLstr_Type *SLutf8_subst_wchar (u, umax, wch, nth,ignore_combining) SLuchar_Type *u, *umax; SLwchar_Type wch; unsigned int nth; int ignore_combining; Description The SLutf8_subst_wchar function replaces the UTF-8 sequence representing the nth character of u by the UTF-8 representation of the character wch. If the value of the ignore_combining parameter is non-zero, then combining characters will not be counted when computing the position of the nth character. In addition, if the nth character contains any combining characters, then the byte-sequence associated with those characters will also be replaced. Since the byte sequence representing wch could be longer than the sequence of the nth character, the function returns a new copy of the resulting string as an SLSTRING. Hence, the calling function should call SLang_free_slstring when the result is nolonger needed. See Also SLutf8_strup, SLutf8_strlow, SLutf8_skip_chars, SLutf8_strlen 1.13. SLutf8_compare Synopsis Compare two UTF-8 encoded sequences Usage int SLutf8_compare (a, amax, b, bmax, nchars, case_sensitive) SLuchar_Type *a, *amax; SLuchar_Type *b, *bmax; unsigned int nchars; int case_sensitive; Description This function compares nchars of one UTF-8 encoded character sequence to another by performing a character by character comparison. The function returns 0, +1, or -1 according to whether the string a is is equal to, greater than, or less than the string at b. At most nchars characters will be tested. The parameters amax and bmax serve as upper boundaries of the strings a and b, resp. If the value of the case_sensitive parameter is non-zero, then a case-sensitive comparison will be performed, otherwise characters will be compared in a case-insensitive manner. Notes For case-sensitive comparisons, this function is analogous to the standard C library's strncmp function. However, SLutf8_compare can also cope with invalid or illegal UTF-8 sequences. See Also SLutf8_strup, SLutf8_strlen, SLutf8_strlen 2. Character classification functions 2.1. SLwchar_toupper Synopsis Uppercase a Unicode character Usage SLwchar_Type SLwchar_toupper (SLwchar_Type wc) Description SLwchar_toupper returns the uppercase equivalent of the specified character. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_tolower, SLwchar_isupper, SLutf8_strup 2.2. SLwchar_tolower Synopsis Lowercase a Unicode character Usage SLwchar_Type SLwchar_tolower (SLwchar_Type wc) Description SLwchar_tolower returns the lowercase equivalent of the specified character. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_toupper, SLwchar_islower, SLutf8_strlow 2.3. SLwchar_wcwidth Synopsis Determine the displayable width of a wide character Usage int SLwchar_wcwidth (SLwchar_Type wc) Description This function returns the number of columns necessary to display the specified Unicode character. Combining characters are meant to be combined with other characters and, as such, have 0 width. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_iscntrl 2.4. SLwchar_isalnum Synopsis Determine if a Unicode character is alphanumeric Usage int SLwchar_isalnum (SLwchar_Type wc) Description SLwchar_isalnum returns a non-zero value if the Unicode character is alphanumeric, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isalpha, SLwchar_isdigit, SLwchar_iscntrl 2.5. SLwchar_isalpha Synopsis Determine if a Unicode character is an alphabetic character Usage int SLwchar_isalpha (SLwchar_Type wc) Description SLwchar_isalpha returns a non-zero value if the Unicode character is alphabetic, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isalnum, SLwchar_isalpha, SLwchar_isdigit, SLwchar_iscntrl 2.6. SLwchar_isblank Synopsis Determine if a Unicode character is a blank Usage int SLwchar_isblank (SLwchar_Type wc) Description SLwchar_isblank returns a non-zero value if the Unicode character is a blank one (space or tab), otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit, SLwchar_iscntrl 2.7. SLwchar_iscntrl Synopsis Determine if a Unicode character is a control character Usage int SLwchar_iscntrl (SLwchar_Type wc) Description SLwchar_isblank returns a non-zero value if the Unicode character is a control character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit, SLwchar_isprint 2.8. SLwchar_isdigit Synopsis Determine if a Unicode character is a digit Usage int SLwchar_isdigit (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a digit, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_isalpha, SLwchar_isxdigit, SLwchar_isprint 2.9. SLwchar_isgraph Synopsis Determine if a non-space Unicode character is printable Usage int SLwchar_isgraph (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a non-space printable character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit, SLwchar_isprint 2.10. SLwchar_islower Synopsis Determine if a Unicode character is alphanumeric Usage int SLwchar_islower (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a lowercase one, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isupper, SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit, SLwchar_iscntrl 2.11. SLwchar_isprint Synopsis Determine if a Unicode character is printable Usage int SLwchar_isprint (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a printable one (includes space), otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isgraph, SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit 2.12. SLwchar_ispunct Synopsis Determine if a Unicode character is a punctuation character Usage int SLwchar_ispunct (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a punctuation character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit, SLwchar_isprint 2.13. SLwchar_isspace Synopsis Determine if a Unicode character is a whitespace character Usage int SLwchar_isspace (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a whitespace character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isblank, SLwchar_isalpha, SLwchar_isdigit, SLwchar_ispunct 2.14. SLwchar_isupper Synopsis Determine if a Unicode character is uppercase Usage int SLwchar_isupper (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is an uppercase character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_islower, SLwchar_isspace, SLwchar_isalpha, SLwchar_isdigit 2.15. SLwchar_isxdigit Synopsis Determine if a Unicode character is a hexidecimal digit Usage int SLwchar_isxdigit (SLwchar_Type wc) Description This function returns a non-zero value if the specified Unicode character is a hexadecimal digit character, otherwise it returns 0. Notes If the library is not in UTF-8 mode, then the current locale will be used. See Also SLwchar_isdigit, SLwchar_isspace, SLwchar_isalpha, SLwchar_ispunct 3. SLsearch interface Functions 3.1. SLsearch_new Synopsis Create an SLsearch_Type object Usage SLsearch_Type *SLsearch_new (SLuchar_Type *key, int search_flags) Description The SLsearch_new function instantiates an SLsearch_Type object for use in ordinary searches (non-regular expression) by the functions in the SLsearch interface. The first argument key is a pointer to a null terminated string that specifies the character string to be searched. This character string may not contain any embedded null characters. The second argument search_flags is used to specify how the search is to be performed. It is a bit-mapped integer whose value is constructed by the bitwise-or of zero or more of the following: SLSEARCH_CASELESS The search shall be performed in a case-insensitive manner. SLSEARCH_UTF8 Both the search string and the text to be searched is UTF-8 encoded. Upon sucess, the function returns the newly created object, and NULL otherwise. When the search object is nolonger needed, it should be freed via the SLsearch_delete function. See Also SLsearch_delete, SLsearch_forward, SLsearch_backward 3.2. SLsearch_delete Synopsis Free the memory associated with a SLsearch_Type object Usage SLsearch_delete (SLsearch_Type *) Description This function should be called to free the memory associated with a SLsearch_Type object created by the SLsearch_new function. Failure to do so will result in a memory leak. See Also SLsearch_new, SLsearch_forward, SLsearch_backward 3.3. SLsearch_forward Synopsis Search forward in a buffer Usage SLuchar_Type SLsearch_forward (st, pmin, pmax) SLsearch_Type *st; SLuchar_Type *pmin, *pmax; Description The SLsearch_forward function searches forward in the buffer defined by the pointers pmin and pmax. The starting point for the search is at the beginning of the buffer at pmin. At no point will the bytes at pmax and beyond be examined. The first parameter st, obtained by a prior call to SLsearch_new, specifies the object to found. be found from a previous call to SLsearch_new. If the object was found, the pointer to the beginning of it will be returned. Otherwise, SLsearch_forward will return NULL. The length of the object may be obtained via the SLsearch_match_len function. Notes This function uses the Boyer-Moore search algorithm when possible. See Also SLsearch_new, SLsearch_backward, SLsearch_delete, SLsearch_match_len 3.4. SLsearch_backward Synopsis Search backward in a buffer Usage SLuchar_Type SLsearch_forward (st, pmin, pstart, pmax) SLsearch_Type *st; SLuchar_Type *pmin, *pstart, *pmax; Description The SLsearch_forward function searches backward in the buffer defined by the pointers pmin and pmax. The starting point for the search is at the position pstart. At no point will the bytes at pmax and beyond be examined. The first parameter st, obtained by a prior call to SLsearch_new, specifies the object to found. If the object was found, the pointer to the beginning of it will be returned. Otherwise, SLsearch_forward will return NULL. The length of the object may be obtained via the SLsearch_match_len function. Notes This function uses the Boyer-Moore search algorithm when possible. It is possible for the end of match to appear after the point where the search began (pstart). See Also SLsearch_new, SLsearch_forward, SLsearch_delete, SLsearch_match_len 3.5. SLsearch_match_len Synopsis Get the length of the previous match Usage unsigned int SLsearch_match_len (SLsearch_Type *st) Description The SLsearch_match_len function returns the length of the match from the most recent search involving the specified SLsearch_Type object. If the most recent search was unsuccessful, the function will return 0. See Also SLsearch_forward, SLsearch_backward, SLsearch_new, SLsearch_delete 4. Screen Management (SLsmg) functions 4.1. SLsmg_fill_region Synopsis Fill a rectangular region with a character Usage void SLsmg_fill_region (r, c, nr, nc, ch) int r int c unsigned int nr unsigned int nc unsigned char ch Description The SLsmg_fill_region function may be used to a rectangular region with the character ch in the current color. The rectangle's upper left corner is at row r and column c, and spans nr rows and nc columns. The position of the virtual cursor will be left at (r, c). See Also SLsmg_write_char, SLsmg_set_color 4.2. SLsmg_set_char_set Synopsis Turn on or off line drawing characters Usage void SLsmg_set_char_set (int a); Description SLsmg_set_char_set may be used to select or deselect the line drawing character set as the current character set. If a is non- zero, the line drawing character set will be selected. Otherwise, the standard character set will be selected. Notes There is no guarantee that this function will actually enable the use of line drawing characters. All it does is cause subsequent characters to be rendered using the terminal's alternate character set. Such character sets usually contain line drawing characters. See Also SLsmg_write_char, SLtt_get_terminfo 4.3. int SLsmg_Scroll_Hash_Border; Synopsis Set the size of the border for the scroll hash Usage int SLsmg_Scroll_Hash_Border = 0; Description This variable may be used to ignore the characters that occur at the beginning and the end of a row when performing the hash calculation to determine whether or not a line has scrolled. The default value is zero which means that all the characters on a line will be used. See Also SLsmg_refresh 4.4. SLsmg_suspend_smg Synopsis Suspend screen management Usage int SLsmg_suspend_smg (void) Description SLsmg_suspend_smg can be used to suspend the state of the screen management facility during suspension of the program. Use of this function will reset the display back to its default state. The funtion SLsmg_resume_smg should be called after suspension. It returns zero upon success, or -1 upon error. This function is similar to SLsmg_reset_smg except that the state of the display prior to calling SLsmg_suspend_smg is saved. See Also SLsmg_resume_smg, SLsmg_reset_smg 4.5. SLsmg_resume_smg Synopsis Resume screen management Usage int SLsmg_resume_smg (void) Description SLsmg_resume_smg should be called after SLsmg_suspend_smg to redraw the display exactly like it was before SLsmg_suspend_smg was called. It returns zero upon success, or -1 upon error. See Also SLsmg_suspend_smg 4.6. SLsmg_erase_eol Synopsis Erase to the end of the row Usage void SLsmg_erase_eol (void); Description SLsmg_erase_eol erases all characters from the current position to the end of the line. The newly created space is given the color of the current color. This function has no effect on the position of the virtual cursor. See Also SLsmg_gotorc, SLsmg_erase_eos, SLsmg_fill_region 4.7. SLsmg_gotorc Synopsis Move the virtual cursor Usage void SLsmg_gotorc (int r, int c) Description The SLsmg_gotorc function moves the virtual cursor to the row r and column c. The first row and first column is specified by r = 0 and c = 0. See Also SLsmg_refresh 4.8. SLsmg_erase_eos Synopsis Erase to the end of the screen Usage void SLsmg_erase_eos (void); Description The SLsmg_erase_eos is like SLsmg_erase_eol except that it erases all text from the current position to the end of the display. The current color will be used to set the background of the erased area. See Also SLsmg_erase_eol 4.9. SLsmg_reverse_video Synopsis Set the current color to 1 Usage void SLsmg_reverse_video (void); Description This function is nothing more than SLsmg_set_color(1). See Also SLsmg_set_color 4.10. SLsmg_set_color (int) Synopsis Set the current color Usage void SLsmg_set_color (int c); Description SLsmg_set_color is used to set the current color. The parameter c is really a color object descriptor. Actual foreground and background colors as well as other visual attributes may be associated with a color descriptor via the SLtt_set_color function. Example This example defines color 7 to be green foreground on black background and then displays some text in this color: SLtt_set_color (7, NULL, "green", "black"); SLsmg_set_color (7); SLsmg_write_string ("Hello"); SLsmg_refresh (); Notes It is important to understand that the screen managment routines know nothing about the actual colors associated with a color descriptor. Only the descriptor itself is used by the SLsmg routines. The lower level SLtt interface converts the color descriptors to actual colors. Thus SLtt_set_color (7, NULL, "green", "black"); SLsmg_set_color (7); SLsmg_write_string ("Hello"); SLtt_set_color (7, NULL, "red", "blue"); SLsmg_write_string ("World"); SLsmg_refresh (); will result in "hello" displayed in red on blue and not green on black. See Also SLtt_set_color, SLtt_set_color_object 4.11. SLsmg_normal_video Synopsis Set the current color to 0 Usage void SLsmg_normal_video (void); Description SLsmg_normal_video sets the current color descriptor to 0. See Also SLsmg_set_color 4.12. SLsmg_printf Synopsis Format a string on the virtual display Usage void SLsmg_printf (char *fmt, ...) Description SLsmg_printf format a printf style variable argument list and writes it on the virtual display. The virtual cursor will be moved to the end of the string. See Also SLsmg_write_string, SLsmg_vprintf 4.13. SLsmg_vprintf Synopsis Format a string on the virtual display Usage void SLsmg_vprintf (char *fmt, va_list ap) Description SLsmg_vprintf formats a string in the manner of vprintf and writes the result to the display. The virtual cursor is advanced to the end of the string. See Also SLsmg_write_string, SLsmg_printf 4.14. SLsmg_write_string Synopsis Write a character string on the display Usage void SLsmg_write_string (char *s) Description The function SLsmg_write_string displays the string s on the virtual display at the current position and moves the position to the end of the string. See Also SLsmg_printf, SLsmg_write_nstring 4.15. SLsmg_write_nstring Synopsis Write the first n characters of a string on the display Usage void SLsmg_write_nstring (char *s, unsigned int n); Description SLsmg_write_nstring writes the first n characters of s to this virtual display. If the length of the string s is less than n, the spaces will used until n characters have been written. s can be NULL, in which case n spaces will be written. See Also SLsmg_write_string, SLsmg_write_nchars 4.16. SLsmg_write_char Synopsis Write a character to the virtual display Usage void SLsmg_write_char (char ch); Description SLsmg_write_char writes the character ch to the virtual display. See Also SLsmg_write_nchars, SLsmg_write_string 4.17. SLsmg_write_nchars Synopsis Write n characters to the virtual display Usage void SLsmg_write_nchars (char *s, unsigned int n); Description SLsmg_write_nchars writes at most n characters from the string s to the display. If the length of s is less than n, the whole length of the string will get written. This function differs from SLsmg_write_nstring in that SLsmg_write_nstring will pad the string to write exactly n characters. SLsmg_write_nchars does not perform any padding. See Also SLsmg_write_nchars, SLsmg_write_nstring 4.18. SLsmg_write_wrapped_string Synopsis Write a string to the display with wrapping Usage void SLsmg_write_wrapped_string (s, r, c, nr, nc, fill) char *s int r, c unsigned int nr, nc int fill Description SLsmg_write_wrapped_string writes the string s to the virtual display. The string will be confined to the rectangular region whose upper right corner is at row r and column c, and consists of nr rows and nc columns. The string will be wrapped at the boundaries of the box. If fill is non-zero, the last line to which characters have been written will get padded with spaces. Notes This function does not wrap on word boundaries. However, it will wrap when a newline charater is encountered. See Also SLsmg_write_string 4.19. SLsmg_cls Synopsis Clear the virtual display Usage void SLsmg_cls (void) Description SLsmg_cls erases the virtual display using the current color. This will cause the physical display to get cleared the next time SLsmg_refresh is called. Notes This function is not the same as SLsmg_gotorc (0,0); SLsmg_erase_eos (); since these statements do not guarantee that the physical screen will get cleared. See Also SLsmg_refresh, SLsmg_erase_eos 4.20. SLsmg_refresh Synopsis Update physical screen Usage void SLsmg_refresh (void) Description The SLsmg_refresh function updates the physical display to look like the virtual display. See Also SLsmg_suspend_smg, SLsmg_init_smg, SLsmg_reset_smg 4.21. SLsmg_touch_lines Synopsis Mark lines on the virtual display for redisplay Usage void SLsmg_touch_lines (int r, unsigned int nr) Description SLsmg_touch_lines marks the nr lines on the virtual display starting at row r for redisplay upon the next call to SLsmg_refresh. Notes This function should rarely be called, if ever. If you find that you need to call this function, then your application should be modified to properly use the SLsmg screen management routines. This function is provided only for curses compatibility. See Also SLsmg_refresh 4.22. SLsmg_init_smg Synopsis Initialize the SLsmg routines Usage int SLsmg_init_smg (void) Description The SLsmg_init_smg function initializes the SLsmg screen management routines. Specifically, this function allocates space for the virtual display and calls SLtt_init_video to put the terminal's physical display in the proper state. It is up to the caller to make sure that the SLtt routines are initialized via SLtt_get_terminfo before calling SLsmg_init_smg. This function should also be called any time the size of the physical display has changed so that it can reallocate a new virtual display to match the physical display. It returns zero upon success, or -1 upon failure. See Also SLsmg_reset_smg 4.23. SLsmg_reset_smg Synopsis Reset the SLsmg routines Usage int SLsmg_reset_smg (void); Description SLsmg_reset_smg resets the SLsmg screen management routines by freeing all memory allocated while it was active. It also calls SLtt_reset_video to put the terminal's display in it default state. See Also SLsmg_init_smg 4.24. SLsmg_char_at Synopsis Get the character at the current position on the virtual display Usage unsigned short SLsmg_char_at(void) Description The SLsmg_char_at function returns the character and its color at the current position on the virtual display. See Also SLsmg_read_raw, SLsmg_write_char 4.25. SLsmg_set_screen_start Synopsis Set the origin of the virtual display Usage void SLsmg_set_screen_start (int *r, int *c) Description SLsmg_set_screen_start sets the origin of the virtual display to the row *r and the column *c. If either r or c is NULL, then the corresponding value will be set to 0. Otherwise, the location specified by the pointers will be updated to reflect the old origin. See slang/demo/pager.c for how this function may be used to scroll horizontally. See Also SLsmg_init_smg 4.26. SLsmg_draw_hline Synopsis Draw a horizontal line Usage void SLsmg_draw_hline (unsigned int len) Description The SLsmg_draw_hline function draws a horizontal line of length len on the virtual display. The position of the virtual cursor is left at the end of the line. See Also SLsmg_draw_vline 4.27. SLsmg_draw_vline Synopsis Draw a vertical line Usage void SLsmg_draw_vline (unsigned int len); Description The SLsmg_draw_vline function draws a vertical line of length len on the virtual display. The position of the virtual cursor is left at the end of the line. See Also ?? 4.28. SLsmg_draw_object Synopsis Draw an object from the alternate character set Usage void SLsmg_draw_object (int r, int c, unsigned char obj) Description The SLsmg_draw_object function may be used to place the object specified by obj at row r and column c. The object is really a character from the alternate character set and may be specified using one of the following constants: SLSMG_HLINE_CHAR Horizontal line SLSMG_VLINE_CHAR Vertical line SLSMG_ULCORN_CHAR Upper left corner SLSMG_URCORN_CHAR Upper right corner SLSMG_LLCORN_CHAR Lower left corner SLSMG_LRCORN_CHAR Lower right corner SLSMG_CKBRD_CHAR Checkboard character SLSMG_RTEE_CHAR Right Tee SLSMG_LTEE_CHAR Left Tee SLSMG_UTEE_CHAR Up Tee SLSMG_DTEE_CHAR Down Tee SLSMG_PLUS_CHAR Plus or Cross character See Also SLsmg_draw_vline, SLsmg_draw_hline, SLsmg_draw_box 4.29. SLsmg_draw_box Synopsis Draw a box on the virtual display Usage void SLsmg_draw_box (int r, int c, unsigned int dr, unsigned int dc) Description SLsmg_draw_box uses the SLsmg_draw_hline and SLsmg_draw_vline functions to draw a rectangular box on the virtual display. The box's upper left corner is placed at row r and column c. The width and length of the box is specified by dc and dr, respectively. See Also SLsmg_draw_vline, SLsmg_draw_hline, SLsmg_draw_object 4.30. SLsmg_set_color_in_region Synopsis Change the color of a specifed region Usage void SLsmg_set_color_in_region (color, r, c, dr, dc) int color; int r, c; unsigned int dr, dc; Description SLsmg_set_color_in_region may be used to change the color of a rectangular region whose upper left corner is given by (r,c), and whose width and height is given by dc and dr, respectively. The color of the region is given by the color parameter. See Also SLsmg_draw_box, SLsmg_set_color 4.31. SLsmg_get_column Synopsis Get the column of the virtual cursor Usage int SLsmg_get_column(void); Description The SLsmg_get_column function returns the current column of the virtual cursor on the virtual display. See Also SLsmg_get_row, SLsmg_gotorc 4.32. SLsmg_get_row Synopsis Get the row of the virtual cursor Usage int SLsmg_get_row(void); Description The SLsmg_get_row function returns the current row of the virtual cursor on the virtual display. See Also SLsmg_get_column, SLsmg_gotorc 4.33. SLsmg_forward Synopsis Move the virtual cursor forward n columns Usage void SLsmg_forward (int n); Description The SLsmg_forward function moves the virtual cursor forward n columns. See Also SLsmg_gotorc 4.34. SLsmg_write_color_chars Synopsis Write characters with color descriptors to virtual display Usage void SLsmg_write_color_chars (unsigned short *s, unsigned int len) Description The SLsmg_write_color_chars function may be used to write len characters, each with a different color descriptor to the virtual display. Each character and its associated color are encoded as an unsigned short such that the lower eight bits form the character and the next eight bits form the color. See Also SLsmg_char_at, SLsmg_write_raw 4.35. SLsmg_read_raw Synopsis Read characters from the virtual display Usage unsigned int SLsmg_read_raw (SLsmg_Char_Type *buf, unsigned int len) Description SLsmg_read_raw attempts to read len characters from the current position on the virtual display into the buffer specified by buf. It returns the number of characters actually read. This number will be less than len if an attempt is made to read past the right margin of the display. Notes The purpose of the pair of functions, SLsmg_read_raw and SLsmg_write_raw, is to permit one to copy the contents of one region of the virtual display to another region. See Also SLsmg_char_at, SLsmg_write_raw 4.36. SLsmg_write_raw Synopsis Write characters directly to the virtual display Usage unsigned int SLsmg_write_raw (unsigned short *buf, unsigned int len) Description The SLsmg_write_raw function attempts to write len characters specified by buf to the display at the current position. It returns the number of characters successfully written, which will be less than len if an attempt is made to write past the right margin. Notes The purpose of the pair of functions, SLsmg_read_raw and SLsmg_write_raw, is to permit one to copy the contents of one region of the virtual display to another region. See Also SLsmg_read_raw 5. Functions that deal with the interpreter 5.1. SLallocate_load_type Synopsis Allocate a SLang_Load_Type object Usage SLang_Load_Type *SLallocate_load_type (char *name) Description The SLallocate_load_type function allocates and initializes space for a SLang_Load_Type object and returns it. Upon failure, the function returns NULL. The parameter name must uniquely identify the object. For example, if the object represents a file, then name could be the absolute path name of the file. See Also SLdeallocate_load_type, SLang_load_object 5.2. SLdeallocate_load_type Synopsis Free a SLang_Load_Type object Usage void SLdeallocate_load_type (SLang_Load_Type *slt) Description This function frees the memory associated with a SLang_Load_Type object that was acquired from a call to the SLallocate_load_type function. See Also SLallocate_load_type, SLang_load_object 5.3. SLang_load_object Synopsis Load an object into the interpreter Usage int SLang_load_object (SLang_Load_Type *obj) Description The function SLang_load_object is a generic function that may be used to loaded an object of type SLang_Load_Type into the interpreter. For example, the functions SLang_load_file and SLang_load_string are wrappers around this function to load a file and a string, respectively. See Also SLang_load_file, SLang_load_string, SLallocate_load_type 5.4. SLclass_allocate_class Synopsis Allocate a class for a new data type Usage SLang_Class_Type *SLclass_allocate_class (char *name) Description The purpose of this function is to allocate and initialize space that defines a new data type or class called name. If successful, a pointer to the class is returned, or upon failure the function returns NULL. This function does not automatically create the new data type. Callback functions must first be associated with the data type via functions such as SLclass_set_push_function, and the data type must be registered with the interpreter via SLclass_register_class. See the S-Lang library programmer's guide for more information. See Also SLclass_register_class, SLclass_set_push_function 5.5. SLclass_register_class Synopsis Register a new data type with the interpreter Usage int SLclass_register_class (cl, type, sizeof_type, class_type) SLang_Class_Type *cl SLtype type unsigned int sizeof_type SLclass_Type class_type Description The SLclass_register_class function is used to register a new class or data type with the interpreter. If successful, the function returns 0, or upon failure, it returns -1. The first parameter, cl, must have been previously obtained via the SLclass_allocate_class function. The second parameter, type specifies the data type of the new class. If set to SLANG_VOID_TYPE then the library will automatically allocate an unused value for the class (the allocated value can then be found using the SLclass_get_class_id function), otherwise a value greater than 255 should be used. The values in the range 0-255 are reserved for internal use by the library. The size that the data type represents in bytes is specified by the third parameter, sizeof_type. This value should not be confused with the sizeof the structure that represents the data type, unless the data type is of class SLANG_CLASS_TYPE_VECTOR or SLANG_CLASS_TYPE_SCALAR. For pointer objects, the value of this parameter is just sizeof(void *). The final parameter specifies the class type of the data type. It must be one of the values: SLANG_CLASS_TYPE_SCALAR SLANG_CLASS_TYPE_VECTOR SLANG_CLASS_TYPE_PTR SLANG_CLASS_TYPE_MMT The SLANG_CLASS_TYPE_SCALAR indicates that the new data type is a scalar. Examples of scalars in SLANG_INT_TYPE and SLANG_DOU- BLE_TYPE. Setting class_type to SLANG_CLASS_TYPE_VECTOR implies that the new data type is a vector, or a 1-d array of scalar types. An example of a data type of this class is the SLANG_COMPLEX_TYPE, which represents complex numbers. SLANG_CLASS_TYPE_PTR specifies the data type is of a pointer type. Examples of data types of this class include SLANG_STRING_TYPE and SLANG_ARRAY_TYPE. Such types must provide for their own memory management. Data types of class SLANG_CLASS_TYPE_MMT are pointer types except that the memory management, i.e., creation and destruction of the type, is handled by the interpreter. Such a type is called a memory managed type. An example of this data type is the SLANG_FILEPTR_TYPE. Notes See the S-Lang Library C Programmer's Guide for more information. See Also SLclass_allocate_class, SLclass_get_class_id 5.6. SLclass_set_string_function Synopsis Set a data type's string representation callback Usage int SLclass_set_string_function (cl, sfun) SLang_Class_Type *cl char *(*sfun) (SLtype, VOID_STAR); Description The SLclass_set_string_function routine is used to define a callback function, sfun, that will be used when a string representation of an object of the data type represented by cl is needed. cl must have already been obtained via a call to SLclass_allocate_class. When called, sfun will be passed two arguments: an SLtype which represents the data type, and the address of the object for which a string represetation is required. The callback function must return a malloced string. Upon success, SLclass_set_string_function returns zero, or upon error it returns -1. Example A callback function that handles both SLANG_STRING_TYPE and SLANG_INT_TYPE variables looks like: char *string_and_int_callback (SLtype type, VOID_STAR addr) { char buf[64]; switch (type) { case SLANG_STRING_TYPE: return SLmake_string (*(char **)addr); case SLANG_INTEGER_TYPE: sprintf (buf, "%d", *(int *)addr); return SLmake_string (buf); } return NULL; } Notes The default string callback simply returns the name of the data type. See Also SLclass_allocate_class, SLclass_register_class 5.7. SLclass_set_destroy_function Synopsis Set the destroy method callback for a data type Usage int SLclass_set_destroy_function (cl, destroy_fun) SLang_Class_Type *cl void (*destroy_fun) (SLtype, VOID_STAR); Description SLclass_set_destroy_function is used to set the destroy callback for a data type. The data type's class cl must have been previously obtained via a call to SLclass_allocate_class. When called, destroy_fun will be passed two arguments: an SLtype which represents the data type, and the address of the object to be destroyed. SLclass_set_destroy_function returns zero upon success, and -1 upon failure. Example The destroy method for SLANG_STRING_TYPE looks like: static void string_destroy (SLtype type, VOID_STAR ptr) { char *s = *(char **) ptr; if (s != NULL) SLang_free_slstring (*(char **) s); } Notes Data types of class SLANG_CLASS_TYPE_SCALAR do not require a destroy callback. However, other classes do. See Also SLclass_allocate_class, SLclass_register_class 5.8. SLclass_set_push_function Synopsis Set the push callback for a new data type Usage int SLclass_set_push_function (cl, push_fun) SLang_Class_Type *cl int (*push_fun) (SLtype, VOID_STAR); Description SLclass_set_push_function is used to set the push callback for a new data type specified by cl, which must have been previously obtained via SLclass_allocate_class. The parameter push_fun is a pointer to the push callback. It is required to take two arguments: an SLtype representing the data type, and the address of the object to be pushed. It must return zero upon success, or -1 upon failure. SLclass_set_push_function returns zero upon success, or -1 upon failure. Example The push callback for SLANG_COMPLEX_TYPE looks like: static int complex_push (SLtype type, VOID_STAR ptr) { double *z = *(double **) ptr; return SLang_push_complex (z[0], z[1]); } See Also SLclass_allocate_class, SLclass_register_class 5.9. SLclass_set_pop_function Synopsis Set the pop callback for a new data type Usage int SLclass_set_pop_function (cl, pop_fun) SLang_Class_Type *cl int (*pop_fun) (SLtype, VOID_STAR); Description SLclass_set_pop_function is used to set the callback for popping an object from the stack for a new data type specified by cl, which must have been previously obtained via SLclass_allocate_class. The parameter pop_fun is a pointer to the pop callback function, which is required to take two arguments: an unsigned character representing the data type, and the address of the object to be popped. It must return zero upon success, or -1 upon failure. SLclass_set_pop_function returns zero upon success, or -1 upon failure. Example The pop callback for SLANG_COMPLEX_TYPE looks like: static int complex_push (SLtype type, VOID_STAR ptr) { double *z = *(double **) ptr; return SLang_pop_complex (&z[0], &z[1]); } See Also SLclass_allocate_class, SLclass_register_class 5.10. SLclass_get_datatype_name Synopsis Get the name of a data type Usage char *SLclass_get_datatype_name (SLtype type) Description The SLclass_get_datatype_name function returns the name of the data type specified by type. For example, if type is SLANG_INT_TYPE, the string "Integer_Type" will be returned. This function returns a pointer that should not be modified or freed. See Also SLclass_allocate_class, SLclass_register_class 5.11. SLang_free_mmt Synopsis Free a memory managed type Usage void SLang_free_mmt (SLang_MMT_Type *mmt) Description The SLang_MMT_Type function is used to free a memory managed data type. See Also SLang_object_from_mmt, SLang_create_mmt 5.12. SLang_object_from_mmt Synopsis Get a pointer to the value of a memory managed type Usage VOID_STAR SLang_object_from_mmt (SLang_MMT_Type *mmt) Description The SLang_object_from_mmt function returns a pointer to the actual object whose memory is being managed by the interpreter. See Also SLang_free_mmt, SLang_create_mmt 5.13. SLang_create_mmt Synopsis Create a memory managed data type Usage SLang_MMT_Type *SLang_create_mmt (SLtype t, VOID_STAR ptr) Description The SLang_create_mmt function returns a pointer to a new memory managed object. This object contains information necessary to manage the memory associated with the pointer ptr which represents the application defined data type of type t. See Also SLang_object_from_mmt, SLang_push_mmt, SLang_free_mmt 5.14. SLang_push_mmt Synopsis Push a memory managed type Usage int SLang_push_mmt (SLang_MMT_Type *mmt) Description This function is used to push a memory managed type onto the interpreter stack. It returns zero upon success, or -1 upon failure. See Also SLang_create_mmt, SLang_pop_mmt 5.15. SLang_pop_mmt Synopsis Pop a memory managed data type Usage SLang_MMT_Type *SLang_pop_mmt (SLtype t) Description The SLang_pop_mmt function may be used to pop a memory managed type of type t from the stack. It returns a pointer to the memory managed object upon success, or NULL upon failure. The function SLang_object_from_mmt should be used to access the actual pointer to the data type. See Also SLang_object_from_mmt, SLang_push_mmt 5.16. SLang_inc_mmt Synopsis Increment a memory managed type reference count Usage void SLang_inc_mmt (SLang_MMT_Type *mmt); Description The SLang_inc_mmt function may be used to increment the reference count associated with the memory managed data type given by mmt. See Also SLang_free_mmt, SLang_create_mmt, SLang_pop_mmt, SLang_pop_mmt 5.17. SLadd_intrin_fun_table Synopsis Add a table of intrinsic functions to the interpreter Usage int SLadd_intrin_fun_table(SLang_Intrin_Fun_Type *tbl, char *pp_name); Description The SLadd_intrin_fun_table function adds an array, or table, of SLang_Intrin_Fun_Type objects to the interpreter. The first parameter, tbl specifies the table to be added. The second parameter pp_name, if non-NULL will be added to the list of preprocessor symbols. This function returns -1 upon failure or zero upon success. Notes A table should only be loaded one time and it is considered to be an error on the part of the application if it loads a table more than once. See Also SLadd_intrin_var_table, SLadd_intrinsic_function, SLdefine_for_ifdef 5.18. SLadd_intrin_var_table Synopsis Add a table of intrinsic variables to the interpreter Usage int SLadd_intrin_var_table (SLang_Intrin_Var_Type *tbl, char *pp_name); Description The SLadd_intrin_var_table function adds an array, or table, of SLang_Intrin_Var_Type objects to the interpreter. The first parameter, tbl specifies the table to be added. The second parameter pp_name, if non-NULL will be added to the list of preprocessor symbols. This function returns -1 upon failure or zero upon success. Notes A table should only be loaded one time and it is considered to be an error on the part of the application if it loads a table more than once. See Also SLadd_intrin_var_table, SLadd_intrinsic_function, SLdefine_for_ifdef 5.19. SLang_load_file Synopsis Load a file into the interpreter Usage int SLang_load_file (char *fn) Description The SLang_load_file function opens the file whose name is specified by fn and feeds it to the interpreter, line by line, for execution. If fn is NULL, the function will take input from stdin. If no error occurs, it returns 0; otherwise, it returns -1, and sets SLang_Error accordingly. For example, if it fails to open the file, it will return -1 with SLang_Error set to SL_OBJ_NOPEN. Notes If the hook SLang_Load_File_Hook declared as int (*SLang_Load_File_Hook)(char *); is non-NULL, the function point to by it will be used to load the file. For example, the jed editor uses this hook to load files via its own routines. See Also SLang_load_object, SLang_load_string 5.20. SLang_restart Synopsis Reset the interpreter after an error Usage void SLang_restart (int full) Description The SLang_restart function should be called by the application at top level if an error occurs. If the parameter full is non- zero, any objects on the S-Lang run time stack will be removed from the stack; otherwise, the stack will be left intact. Any time the stack is believed to be trashed, this routine should be called with a non-zero argument (e.g., if setjmp/longjmp is called). Calling SLang_restart does not reset the global variable SLang_Error to zero. It is up to the application to reset that variable to zero after calling SLang_restart. Example while (1) { if (SLang_Error) { SLang_restart (1); SLang_Error = 0; } (void) SLang_load_file (NULL); } See Also SLang_init_slang, SLang_load_file 5.21. SLang_byte_compile_file Synopsis Byte-compile a file for faster loading Usage int SLang_byte_compile_file(char *fn, int reserved) Description The SLang_byte_compile_file function ``byte-compiles'' the file fn for faster loading by the interpreter. This produces a new file whose filename is equivalent to the one specified by fn, except that a 'c' is appended to the name. For example, if fn is set to init.sl, then the new file will have the name init.slc. The meaning of the second parameter, reserved, is reserved for future use. For now, set it to 0. The function returns zero upon success, or -1 upon error and sets SLang_Error accordingly. See Also SLang_load_file, SLang_init_slang 5.22. SLang_autoload Synopsis Autoload a function from a file Usage int SLang_autoload(char *funct, char *filename) Description The SLang_autoload function may be used to associate a slang function name funct with the file filename such that if funct has not already been defined when needed, it will be loaded from filename. SLang_autoload has no effect if funct has already been defined. Otherwise it declares funct as a user-defined S-Lang function. It returns 0 upon success, or -1 upon error. See Also SLang_load_file, SLang_is_defined 5.23. SLang_load_string Synopsis Interpret a string Usage int SLang_load_string(char *str) Description The SLang_load_string function feeds the string specified by str to the interpreter for execution. It returns zero upon success, or -1 upon failure. See Also SLang_load_file, SLang_load_object 5.24. SLdo_pop Synopsis Delete an object from the stack Usage int SLdo_pop(void) Description This function removes an object from the top of the interpeter's run-time stack and frees any memory associated with it. It returns zero upon success, or -1 upon error (most likely due to a stack-underflow). See Also SLdo_pop_n, SLang_pop_integer, SLang_pop_string 5.25. SLdo_pop_n Synopsis Delete n objects from the stack Usage int SLdo_pop_n (unsigned int n) Description The SLdo_pop_n function removes the top n objects from the interpreter's run-time stack and frees all memory associated with the objects. It returns zero upon success, or -1 upon error (most likely due to a stack-underflow). See Also SLdo_pop, SLang_pop_integer, SLang_pop_string 5.26. SLang_pop_integer Synopsis Pop an integer off the stack Usage int SLang_pop_integer (int *i) Description The SLang_pop_integer function removes an integer from the top of the interpreter's run-time stack and returns its value via the pointer i. If successful, it returns zero. However, if the top stack item is not of type SLANG_INT_TYPE, or the stack is empty, the function will return -1 and set SLang_Error accordingly. See Also SLang_push_integer, SLang_pop_double 5.27. SLpop_string Synopsis Pop a string from the stack Usage int SLpop_string (char **strptr); Description The SLpop_string function pops a string from the stack and returns it as a malloced pointer. It is up to the calling routine to free this string via a call to free or SLfree. If successful, SLpop_string returns zero. However, if the top stack item is not of type SLANG_STRING_TYPE, or the stack is empty, the function will return -1 and set SLang_Error accordingly. Example define print_string (void) { char *s; if (-1 == SLpop_string (&s)) return; fputs (s, stdout); SLfree (s); } Notes This function should not be confused with SLang_pop_slstring, which pops a hashed string from the stack. See Also SLang_pop_slstring. SLfree 5.28. SLang_pop_string Synopsis Pop a string from the stack Usage int SLang_pop_string(char **strptr, int *do_free) Description The SLpop_string function pops a string from the stack and returns it as a malloced pointer via strptr. After the function returns, the integer pointed to by the second parameter will be set to a non-zero value if *strptr should be freed via free or SLfree. If successful, SLpop_string returns zero. However, if the top stack item is not of type SLANG_STRING_TYPE, or the stack is empty, the function will return -1 and set SLang_Error accordingly. Notes This function is considered obsolete and should not be used by applications. If one requires a malloced string for modification, SLpop_string should be used. If one requires a constant string that will not be modifed by the application, SLang_pop_slstring should be used. See Also SLang_pop_slstring, SLpop_string 5.29. SLang_pop_slstring Synopsis Pop a hashed string from the stack Usage int SLang_pop_slstring (char **s_ptr) Description The SLang_pop_slstring function pops a hashed string from the S- Lang run-time stack and returns it via s_ptr. It returns zero if successful, or -1 upon failure. The resulting string should be freed via a call to SLang_free_slstring after use. Example void print_string (void) { char *s; if (-1 == SLang_pop_slstring (&s)) return; fprintf (stdout, "%s\n", s); SLang_free_slstring (s); } Notes SLang_free_slstring is the preferred function for popping strings. This is a result of the fact that the interpreter uses hashed strings as the native representation for string data. One must never free a hashed string using free or SLfree. In addition, one must never make any attempt to modify a hashed string and doing so will result in memory corruption. See Also SLang_free_slstring, SLpop_string 5.30. SLang_pop_double Synopsis Pop a double from the stack Usage int SLang_pop_double (double *dptr) Description The SLang_pop_double function pops a double precision number from the stack and returns it via dptr. This function returns 0 upon success, otherwise it returns -1 and sets SLang_Error accordingly. See Also SLang_pop_integer, SLang_push_double 5.31. SLang_pop_complex Synopsis Pop a complex number from the stack Usage int SLang_pop_complex (double *re, double *im) Description SLang_pop_complex pops a complex number from the stack and returns it via the parameters re and im as the real and imaginary parts of the complex number, respectively. This function automatically converts objects of type SLANG_DOUBLE_TYPE and SLANG_INT_TYPE to SLANG_COMPLEX_TYPE, if necessary. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. See Also SLang_pop_integer, SLang_pop_double, SLang_push_complex 5.32. SLang_push_complex Synopsis Push a complex number onto the stack Usage int SLang_push_complex (double re, double im) Description SLang_push_complex may be used to push the complex number whose real and imaginary parts are given by re and im, respectively. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. See Also SLang_pop_complex, SLang_push_double 5.33. SLang_push_double Synopsis Push a double onto the stack Usage int SLang_push_double(double d) Description SLang_push_double may be used to push the double precision floating point number d onto the interpreter's run-time stack. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. See Also SLang_pop_double, SLang_push_integer 5.34. SLang_push_string Synopsis Push a string onto the stack Usage int SLang_push_string (char *s) Description SLang_push_string pushes a copy of the string specified by s onto the interpreter's run-time stack. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. Notes If s is NULL, this function pushes NULL (SLANG_NULL_TYPE) onto the stack. See Also SLang_push_malloced_string 5.35. SLang_push_integer Synopsis Push an integer onto the stack Usage int SLang_push_integer (int i) Description SLang_push_integer the integer i onto the interpreter's run-time stack. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. See Also SLang_pop_integer, SLang_push_double, SLang_push_string 5.36. SLang_push_malloced_string Synopsis Push a malloced string onto the stack Usage int SLang_push_malloced_string (char *s); Description SLang_push_malloced_string may be used to push a malloced string onto the interpreter's run-time stack. It returns zero upon success, or -1 upon error setting SLang_Error accordingly. Example The following example illustrates that it is up to the calling routine to free the string if SLang_push_malloced_string fails: int push_hello (void) { char *s = malloc (6); if (s == NULL) return -1; strcpy (s, "hello"); if (-1 == SLang_push_malloced_string (s)) { free (s); return -1; } return 0; } Example The function SLang_create_slstring returns a hashed string. Such a string may not be malloced and should not be passed to SLang_push_malloced_string. Notes If s is NULL, this function pushes NULL (SLANG_NULL_TYPE) onto the stack. See Also SLang_push_string, SLmake_string 5.37. SLang_is_defined Synopsis Check to see if the interpreter defines an object Usage int SLang_is_defined (char *nm) Description The SLang_is_defined function may be used to determine whether or not a variable or function whose name is given by em has been defined. It returns zero if no such object has been defined. Otherwise it returns a non-zero value according to the following table: 1 intrinsic function 2 user-defined slang function -1 intrinsic variable -2 user-defined global variable Note that variables correspond to negative numbers and functions are represented by positive numbers. See Also SLadd_intrinsic_function, SLang_run_hooks, SLang_execute_function 5.38. SLang_run_hooks Synopsis Run a user-defined hook with arguments Usage int SLang_run_hooks (char *fname, unsigned int n, ...) Description The SLang_run_hooks function may be used to execute a user- defined function named fname. Before execution of the function, the n string arguments specified by the variable parameter list are pushed onto the stack. If the function fname does not exist, SLang_run_hooks returns zero; otherwise, it returns 1 upon successful execution of the function, or -1 if an error occurred. Example The jed editor uses SLang_run_hooks to setup the mode of a buffer based on the filename extension of the file associated with the buffer: char *ext = get_filename_extension (filename); if (ext == NULL) return -1; if (-1 == SLang_run_hooks ("mode_hook", 1, ext)) return -1; return 0; See Also SLang_is_defined, SLang_execute_function 5.39. SLang_execute_function Synopsis Execute a user or intrinsic function Usage int SLang_execute_function (char *fname) Description This function may be used to execute either a user-defined function or an intrinisic function. The name of the function is specified by fname. It returns zero if fname is not defined, or 1 if the function was successfully executed, or -1 upon error. Notes The function SLexecute_function may be a better alternative for some uses. See Also SLang_run_hooks, SLexecute_function, SLang_is_defined 5.40. SLang_get_function Synopsis Get a pointer to a S-Lang function Usage SLang_Name_Type *SLang_get_function (char *fname) Description This function returns a pointer to the internal S-Lang table entry of a function whose name is given by fname. It returns NULL upon failure. The value returned by this function can be used SLexecute_function to call the function directly from C. See Also SLexecute_function 5.41. SLexecute_function Synopsis Execute a S-Lang or intrinsic function Usage int SLexecute_function (SLang_Name_Type *nt) Description The SLexecute_function allows an application to call the S-Lang function specified by the SLang_Name_Type pointer nt. This parameter must be non NULL and must have been previously obtained by a call to SLang_get_function. Example Consider the S-Lang function: define my_fun (x) { return x^2 - 2; } Suppose that it is desired to call this function many times with different values of x. There are at least two ways to do this. The easiest way is to use SLang_execute_function by passing the string "my_fun". A better way that is much faster is to use SLexe- cute_function: int sum_a_function (char *fname, double *result) { double sum, x, y; SLang_Name_Type *nt; if (NULL == (nt = SLang_get_function (fname))) return -1; sum = 0; for (x = 0; x < 10.0; x += 0.1) { SLang_start_arg_list (); if (-1 == SLang_push_double (x)) return -1; SLang_end_arg_list (); if (-1 == SLexecute_function (nt)) return -1; if (-1 == SLang_pop_double (&y)) return -1; sum += y; } return sum; } Although not necessary in this case, SLang_start_arg_list and SLang_end_arg_list were used to provide the function with informa- tion about the number of parameters passed to it. See Also SLang_get_function, SLang_start_arg_list, SLang_end_arg_list 5.42. SLang_peek_at_stack Synopsis Find the type of object on the top of the stack Usage int SLang_peek_at_stack (void) Description The SLang_peek_at_stack function is useful for determining the data type of the object at the top of the stack. It returns the data type, or -1 upon a stack-underflow error. It does not remove anything from the stack. See Also SLang_pop_string, SLang_pop_integer 5.43. SLang_pop_fileptr Synopsis Pop a file pointer Usage int SLang_pop_fileptr (SLang_MMT_Type **mmt, FILE **fp) Description SLang_pop_fileptr pops a file pointer from the S-Lang run-time stack. It returns zero upon success, or -1 upon failure. A S-Lang file pointer (SLANG_FILEPTR_TYPE) is actually a memory managed object. For this reason, SLang_pop_fileptr also returns the memory managed object via the argument list. It is up to the calling routine to call SLang_free_mmt to free the object. Example The following example illustrates an application defined intrinsic function that writes a user defined double precision number to a file. Note the use of SLang_free_mmt: int write_double (void) { double t; SLang_MMT_Type *mmt; FILE *fp; int status; if (-1 == SLang_pop_double (&d, NULL, NULL)) return -1; if (-1 == SLang_pop_fileptr (&mmt, &fp)) return -1; status = fwrite (&d, sizeof (double), 1, fp); SLang_free_mmt (mmt); return status; } This function can be used by a S-Lang function as follows: define write_some_values () { variable fp, d; fp = fopen ("myfile.dat", "wb"); if (fp == NULL) error ("file failed to open"); for (d = 0; d < 10.0; d += 0.1) { if (-1 == write_double (fp, d)) error ("write failed"); } if (-1 == fclose (fp)) error ("fclose failed"); } See Also SLang_free_mmt, SLang_pop_double 5.44. SLadd_intrinsic_function Synopsis Add a new intrinsic function to the interpreter Usage int SLadd_intrinsic_function (name, f, type, nargs, ...) char *name FVOID_STAR f SLtype type unsigned int nargs Description The SLadd_intrinsic_function function may be used to add a new intrinsic function. The S-Lang name of the function is specified by name and the actual function pointer is given by f, cast to FVOID_STAR. The third parameter, type specifies the return type of the function and must be one of the following values: SLANG_VOID_TYPE (returns nothing) SLANG_INT_TYPE (returns int) SLANG_DOUBLE_TYPE (returns double) SLANG_STRING_TYPE (returns char *) The nargs parameter specifies the number of parameters to pass to the function. The variable argument list following nargs must con- sists of nargs integers which specify the data type of each argu- ment. The function returns zero upon success or -1 upon failure. Example The jed editor uses this function to change the system intrinsic function to the following: static int jed_system (char *cmd) { if (Jed_Secure_Mode) { msg_error ("Access denied."); return -1; } return SLsystem (cmd); } After initializing the interpreter with SLang_init_slang, jed calls SLadd_intrinsic_function to substitute the above definition for the default S-Lang definition: if (-1 == SLadd_intrinsic_function ("system", (FVOID_STAR)jed_system, SLANG_INT_TYPE, 1, SLANG_STRING_TYPE)) return -1; See Also SLadd_intrinsic_variable, SLadd_intrinsic_array 5.45. SLadd_intrinsic_variable Synopsis Add an intrinsic variable to the interpreter Usage int SLadd_intrinsic_variable (name, addr, type, rdonly) char *name VOID_STAR addr SLtype type int rdonly Description The SLadd_intrinsic_variable function adds an intrinsic variable called name to the interpeter. The second parameter addr specifies the address of the variable (cast to VOID_STAR). The third parameter, type, specifies the data type of the variable. If the fourth parameter, rdonly, is non-zero, the variable will interpreted by the interpreter as read-only. If successful, SLadd_intrinsic_variable returns zero, otherwise it returns -1. Example Suppose that My_Global_Int is a global variable (at least not a local one): int My_Global_Int; It can be added to the interpreter via the function call if (-1 == SLadd_intrinsic_variable ("MyGlobalInt", (VOID_STAR)&My_Global_Int, SLANG_INT_TYPE, 0)) exit (1); Notes The current implementation requires all pointer type intrinsic variables to be read-only. For example, char *My_Global_String; is of type SLANG_STRING_TYPE, and must be declared as read-only. Finally, not that char My_Global_Char_Buf[256]; is not a SLANG_STRING_TYPE object. This difference is very impor- tant because internally the interpreter dereferences the address passed to it to get to the value of the variable. See Also SLadd_intrinsic_function, SLadd_intrinsic_array 5.46. SLclass_add_unary_op Synopsis ?? Usage int SLclass_add_unary_op (SLtype,int (*) (int, SLtype, VOID_STAR, unsigned int, VOID_STAR), int (*) (int, SLtype, SLtype *)); Description ?? See Also ?? 5.47. SLclass_add_app_unary_op Synopsis ?? Usage int SLclass_add_app_unary_op (SLtype, int (*) (int,SLtype, VOID_STAR, unsigned int,VOID_STAR),int (*) (int, SLtype, SLtype *)); Description ?? See Also ?? 5.48. SLclass_add_binary_op Synopsis ?? Usage int SLclass_add_binary_op (SLtype, SLtype,int (*)(int, SLtype, VOID_STAR, unsigned int,SLtype, VOID_STAR, unsigned int,VOID_STAR),int (*) (int, SLtype, SLtype, SLtype *)); Description ?? See Also ?? 5.49. SLclass_add_math_op Synopsis ?? Usage int SLclass_add_math_op (SLtype,int (*)(int,SLtype, VOID_STAR, unsigned int,VOID_STAR),int (*)(int, SLtype, SLtype *)); Description ?? See Also ?? 5.50. SLclass_add_typecast Synopsis ?? Usage int SLclass_add_typecast (SLtype, SLtype int (*)_PROTO((SLtype, VOID_STAR, unsigned int,SLtype, VOID_STAR)),int); Description ?? See Also ?? 6. Library Initialization Functions 6.1. SLang_init_slang Synopsis Initialize the interpreter Usage int SLang_init_slang (void) Description The SLang_init_slang function must be called by all applications that use the S-Lang interpreter. It initializes the interpreter, defines the built-in data types, and adds a set of core intrinsic functions. The function returns 0 upon success, or -1 upon failure. See Also SLang_init_slfile, SLang_init_slmath, SLang_init_slunix 6.2. SLang_init_slfile Synopsis Initialize the interpreter file I/O intrinsics Usage int SLang_init_slfile (void) Description This function initializes the interpreters file I/O intrinsic functions. This function adds intrinsic functions such as fopen, fclose, and fputs to the interpreter. It returns 0 if successful, or -1 upon error. Notes Before this function can be called, it is first necessary to call SLang_init_slang. It also adds the preprocessor symbol __SLFILE__ to the interpreter. See Also SLang_init_slang, SLang_init_slunix, SLang_init_slmath 6.3. SLang_init_slmath Synopsis Initialize the interpreter math intrinsics Usage int SLang_init_slmath (void) Description The SLang_init_slmath function initializes the interpreter's mathematical intrinsic functions and makes them available to the language. The intrinsic functions include sin, cos, tan, etc... It returns 0 if successful, or -1 upon failure. Notes This function must be called after SLang_init_slang. It adds the preprocessor symbol __SLMATH__ to the interpreter. See Also SLang_init_slang, SLang_init_slfile, SLang_init_slunix 6.4. SLang_init_slunix Synopsis Make available some unix system calls to the interpreter Usage int SLang_init_slunix (void) Description The SLang_init_slunix function initializes the interpreter's unix system call intrinsic functions and makes them available to the language. Examples of functions made available by SLang_init_slunix include chmod, chown, and stat_file. It returns 0 if successful, or -1 upon failure. Notes This function must be called after SLang_init_slang. It adds the preprocessor symbol __SLUNIX__ to the interpreter. See Also SLang_init_slang, SLang_init_slfile, SLang_init_slmath 7. Miscellaneous Functions 7.1. SLcurrent_time_string Synopsis Get the current time as a string Usage char *SLcurrent_time_string (void) Description The SLcurrent_time_string function uses the C library function ctime to obtain a string representation of the current date and time in the form "Wed Dec 10 12:50:28 1997" However, unlike the ctime function, a newline character is not present in the string. The returned value points to a statically allocated memory block which may get overwritten on subsequent function calls. See Also SLmake_string 7.2. SLatoi Synopsis Convert a text string to an integer Usage int SLatoi(unsigned char *str Description SLatoi parses the string str to interpret it as an integer value. Unlike atoi, SLatoi can also parse strings containing integers expressed in hexidecimal (e.g., "0x7F") and octal (e.g., "012".) notation. See Also SLang_guess_type 7.3. SLextract_list_element Synopsis Extract a substring of a delimited string Usage int SLextract_list_element (dlist, nth, delim, buf, buflen) char *dlist; unsigned int nth; char delim; char *buf; unsigned int buflen; Description SLextract_list_element may be used to obtain the nth element of a list of strings, dlist, that are delimited by the character delim. The routine copies the nth element of dlist to the buffer buf whose size is buflen characters. It returns zero upon success, or -1 if dlist does not contain an nth element. Example A delimited list of strings may be turned into an array of strings as follows. For conciseness, all malloc error checking has been omitted. int list_to_array (char *list, char delim, char ***ap) { unsigned int nth; char **a; char buf[1024]; /* Determine the size of the array */ nth = 0; while (0 == SLextract_list_element (list, nth, delim, buf, sizeof(buf))) nth++; ap = (char **) SLmalloc ((nth + 1) * sizeof (char **)); nth = 0; while (0 == SLextract_list_element (list, nth, delim, buf, sizeof(buf))) { a[nth] = SLmake_string (buf); nth++; } a[nth] = NULL; *ap = a; return 0; } See Also SLmalloc, SLmake_string 8. Error and Messaging Functions 8.1. SLang_verror Synopsis Signal an error with a message Usage void SLang_verror (int code, char *fmt, ...); Description The SLang_verror function sets SLang_Error to code if SLang_Error is 0. It also displays the error message implied by the printf variable argument list using fmt as the format. Example FILE *open_file (char *file) { char *file = "my_file.dat"; if (NULL == (fp = fopen (file, "w"))) SLang_verror (SL_INTRINSIC_ERROR, "Unable to open %s", file); return fp; } See Also SLang_vmessage, SLang_exit_error 8.2. SLang_doerror Synopsis Signal an error Usage void SLang_doerror (char *err_str) Description The SLang_doerror function displays the string err_str to the error device and signals a S-Lang error. Notes SLang_doerror is considered to obsolete. Applications should use the SLang_verror function instead. See Also SLang_verror, SLang_exit_error 8.3. SLang_vmessage Synopsis Display a message to the message device Usage void SLang_vmessage (char *fmt, ...) Description This function prints a printf style formatted variable argument list to the message device. The default message device is stdout. See Also SLang_verror 8.4. SLang_exit_error Synopsis Exit the program and display an error message Usage void SLang_exit_error (char *fmt, ...) Description The SLang_exit_error function terminates the program and displays an error message using a printf type variable argument list. The default behavior to this function is to write the message to stderr and exit with the exit system call. If the function pointer SLang_Exit_Error_Hook is non-NULL, the function to which it points will be called. This permits an application to perform whatever cleanup is necessary. This hook has the prototype: void (*SLang_Exit_Error_Hook)(char *, va_list); See Also SLang_verror, exit 9. String and Memory Allocation Functions 9.1. SLmake_string Synopsis Duplicate a string Usage char *SLmake_string (char *s) Description The SLmake_string function creates a new copy of the string s, via malloc, and returns it. Upon failure it returns NULL. Since the resulting string is malloced, it should be freed when nolonger needed via a call to either free or SLfree. Notes SLmake_string should not be confused with the function SLang_create_slstring, which performs a similar function. See Also SLmake_nstring, SLfree, SLmalloc, SLang_create_slstring 9.2. SLmake_nstring Synopsis Duplicate a substring Usage char *SLmake_nstring (char *s, unsigned int n) Description This function is like SLmake_string except that it creates a null terminated string formed from the first n characters of s. Upon failure, it returns NULL, otherwise it returns the new string. When nolonger needed, the returned string should be freed with SLfree. See Also SLmake_string, SLfree, SLang_create_nslstring 9.3. SLang_create_nslstring Synopsis Created a hashed substring Usage char *SLang_create_nslstring (char *s, unsigned int n) Description SLang_create_nslstring is like SLang_create_slstring except that only the first n characters of s are used to create the hashed string. Upon error, it returns NULL, otherwise it returns the hashed substring. Such a string must be freed by the function SLang_free_slstring. Notes Do not use free or SLfree to free the string returned by SLang_create_slstring or SLang_create_nslstring. Also it is important that no attempt is made to modify the hashed string returned by either of these functions. If one needs to modify a string, the functions SLmake_string or SLmake_nstring should be used instead. See Also SLang_free_slstring, SLang_create_slstring, SLmake_nstring 9.4. SLang_create_slstring Synopsis Create a hashed string Usage char *SLang_create_slstring (char *s) Description The SLang_create_slstring creates a copy of s and returns it as a hashed string. Upon error, the function returns NULL, otherwise it returns the hashed string. Such a string must only be freed via the SLang_free_slstring function. Notes Do not use free or SLfree to free the string returned by SLang_create_slstring or SLang_create_nslstring. Also it is important that no attempt is made to modify the hashed string returned by either of these functions. If one needs to modify a string, the functions SLmake_string or SLmake_nstring should be used instead. See Also SLang_free_slstring, SLang_create_nslstring, SLmake_string 9.5. SLang_free_slstring Synopsis Free a hashed string Usage void SLang_free_slstring (char *s) Description The SLang_free_slstring function is used to free a hashed string such as one returned by SLang_create_slstring, SLang_create_nslstring, or SLang_create_static_slstring. If s is NULL, the routine does nothing. See Also SLang_create_slstring, SLang_create_nslstring, SLang_create_static_slstring 9.6. SLang_concat_slstrings Synopsis Concatenate two strings to produce a hashed string Usage char *SLang_concat_slstrings (char *a, char *b) Description The SLang_concat_slstrings function concatenates two strings, a and b, and returns the result as a hashed string. Upon failure, NULL is returned. Notes A hashed string can only be freed using SLang_free_slstring. Never use free or SLfree to free a hashed string, otherwise memory corruption will result. See Also SLang_free_slstring, SLang_create_slstring 9.7. SLang_create_static_slstring Synopsis Create a hashed string Usage char *SLang_create_static_slstring (char *s_literal) Description The SLang_create_static_slstring creates a hashed string from the string literal s_literal and returns the result. Upon failure it returns NULL. Example char *create_hello (void) { return SLang_create_static_slstring ("hello"); } Notes This function should only be used with string literals. See Also SLang_create_slstring, SLang_create_nslstring 9.8. SLmalloc Synopsis Allocate some memory Usage char *SLmalloc (unsigned int nbytes) Description This function uses malloc to allocate nbytes of memory. Upon error it returns NULL; otherwise it returns a pointer to the allocated memory. One should use SLfree to free the memory after use. See Also SLfree, SLrealloc, SLcalloc 9.9. SLcalloc Synopsis Allocate some memory Usage char *SLcalloc (unsigned int num_elem, unsigned int elem_size) Description This function uses calloc to allocate memory for num_elem objects with each of size elem_size and returns the result. In addition, the newly allocated memory is zeroed. Upon error it returns NULL; otherwise it returns a pointer to the allocated memory. One should use SLfree to free the memory after use. See Also SLmalloc, SLrealloc, SLfree 9.10. SLfree Synopsis Free some allocated memory Usage void SLfree (char *ptr) Description The SLfree function deallocates the memory specified by ptr, which may be NULL in which case the function does nothing. Notes Never use this function to free a hashed string returned by one of the family of slstring functions, e.g., SLang_pop_slstring. See Also SLmalloc, SLcalloc, SLrealloc, SLmake_string 9.11. SLrealloc Synopsis Resize a dynamic memory block Usage char *SLrealloc (char *ptr, unsigned int new_size) Description The SLrealloc uses the realloc function to resize the memory block specified by ptr to the new size new_size. If ptr is NULL, the function call is equivalent to SLmalloc(new_size). Similarly, if new_size is zero, the function call is equivalent to SLfree(ptr). If the function fails, or if new_size is zero, NULL is returned. Otherwise a pointer is returned to the (possibly moved) new block of memory. See Also SLfree, SLmalloc, SLcalloc 10. Keyboard Input Functions 10.1. SLang_init_tty Synopsis Initialize the terminal keyboard interface Usage int SLang_init_tty (int intr_ch, int no_flow_ctrl, int opost) Description SLang_init_tty initializes the terminal for single character input. If the first parameter intr_ch is in the range 0-255, it will be used as the interrupt character, e.g., under Unix this character will generate a SIGINT signal. Otherwise, if it is -1, the interrupt character will be left unchanged. If the second parameter no_flow_ctrl is non-zero, flow control (XON/XOFF) processing will be enabled. If the last parmeter opost is non-zero, output processing by the terminal will be enabled. If one intends to use this function in conjunction with the S-Lang screen management routines (SLsmg), this paramete shold be set to zero. SLang_init_tty returns zero upon success, or -1 upon error. Notes Terminal I/O is a complex subject. The S-Lang interface presents a simplification that the author has found useful in practice. For example, the only special character processing that SLang_init_tty enables is that of the SIGINT character, and the generation of other signals via the keyboard is disabled. However, generation of the job control signal SIGTSTP is possible via the SLtty_set_suspend_state function. Under Unix, the integer variable SLang_TT_Read_FD is used to specify the input descriptor for the terminal. If SLang_TT_Read_FD represents a terminal device as determined via the isatty system call, then it will be used as the terminal file descriptor. Otherwise, the terminal device /dev/tty will used as the input device. The default value of SLang_TT_Read_FD is -1 which causes /dev/tty to be used. So, if you prefer to use stdin for input, then set SLang_TT_Read_FD to fileno(stdin) before calling SLang_init_tty. If the variable SLang_TT_Baud_Rate is zero when this function is called, the function will attempt to determine the baud rate by querying the terminal driver and set SLang_TT_Baud_Rate to that value. See Also SLang_reset_tty, SLang_getkey, SLtty_set_suspend_state 10.2. SLang_reset_tty Synopsis Reset the terminal Usage void SLang_reset_tty (void) Description SLang_reset_tty resets the terminal interface back to the state it was in before SLang_init_tty was called. See Also SLang_init_tty 10.3. SLtty_set_suspend_state Synopsis Enable or disable keyboard suspension Usage void SLtty_set_suspend_state (int s) Description The SLtty_set_suspend_state function may be used to enable or disable keyboard generation of the SIGTSTP job control signal. If s is non-zero, generation of this signal via the terminal interface will be enabled, otherwise it will be disabled. This function should only be called after the terminal driver has be initialized via SLang_init_tty. The SLang_init_tty always disables the generation of SIGTSTP via the keyboard. See Also SLang_init_tty 10.4. SLang_getkey Synopsis Read a character from the keyboard Usage unsigned int SLang_getkey (void); Description The SLang_getkey reads a single character from the terminal and returns it. The terminal must first be initialized via a call to SLang_init_tty before this function can be called. Upon success, SLang_getkey returns the character read from the terminal, otherwise it returns SLANG_GETKEY_ERROR. See Also SLang_init_tty, SLang_input_pending, SLang_ungetkey 10.5. SLang_ungetkey_string Synopsis Unget a key string Usage int SLang_ungetkey_string (unsigned char *buf, unsigned int n) Description The SLang_ungetkey_string function may be used to push the n characters pointed to by buf onto the buffered input stream that SLgetkey uses. If there is not enough room for the characters, -1 is returned and none are buffered. Otherwise, it returns zero. Notes The difference between SLang_buffer_keystring and SLang_ungetkey_string is that the SLang_buffer_keystring appends the characters to the end of the getkey buffer, whereas SLang_ungetkey_string inserts the characters at the beginning of the input buffer. See Also SLang_ungetkey, SLang_getkey 10.6. SLang_buffer_keystring Synopsis Append a keystring to the input buffer Usage int SLang_buffer_keystring (unsigned char *b, unsigned int len) Description SLang_buffer_keystring places the len characters specified by b at the end of the buffer that SLang_getkey uses. Upon success it returns 0; otherwise, no characters are buffered and it returns -1. Notes The difference between SLang_buffer_keystring and SLang_ungetkey_string is that the SLang_buffer_keystring appends the characters to the end of the getkey buffer, whereas SLang_ungetkey_string inserts the characters at the beginning of the input buffer. See Also SLang_getkey, SLang_ungetkey, SLang_ungetkey_string 10.7. SLang_ungetkey Synopsis Push a character back onto the input buffer Usage int SLang_ungetkey (unsigned char ch) Description SLang_ungetkey pushes the character ch back onto the SLgetkey input stream. Upon success, it returns zero, otherwise it returns 1. Example This function is implemented as: int SLang_ungetkey (unsigned char ch) { return SLang_ungetkey_string(&ch, 1); } See Also SLang_getkey, SLang_ungetkey_string 10.8. SLang_flush_input Synopsis Discard all keyboard input waiting to be read Usage void SLang_flush_input (void) Description SLang_flush_input discards all input characters waiting to be read by the SLang_getkey function. See Also SLang_getkey 10.9. SLang_input_pending Synopsis Check to see if input is pending Usage int SLang_input_pending (int tsecs) Description SLang_input_pending may be used to see if an input character is available to be read without causing SLang_getkey to block. It will wait up to tsecs tenths of a second if no characters are immediately available for reading. If tsecs is less than zero, then SLang_input_pending will wait -tsecs milliseconds for input, otherwise tsecs represents 1/10 of a second intervals. Notes Not all systems support millisecond resolution. See Also SLang_getkey 10.10. SLang_set_abort_signal Synopsis Set the signal to trap SIGINT Usage void SLang_set_abort_signal (void (*f)(int)); Description SLang_set_abort_signal sets the function that gets triggered when the user presses the interrupt key (SIGINT) to the function f. If f is NULL the default handler will get installed. Example The default interrupt handler on a Unix system is: static void default_sigint (int sig) { SLKeyBoard_Quit = 1; if (SLang_Ignore_User_Abort == 0) SLang_Error = SL_USER_BREAK; SLsignal_intr (SIGINT, default_sigint); } Notes For Unix programmers, the name of this function may appear misleading since it is associated with SIGINT and not SIGABRT. The origin of the name stems from the original intent of the function: to allow the user to abort the running of a S-Lang interpreter function. See Also SLang_init_tty, SLsignal_intr 11. Keymap Functions 11.1. SLkm_define_key Synopsis Define a key in a keymap Usage int SLkm_define_key (char *seq, FVOID_STAR f, SLKeyMap_List_Type *km) Description SLkm_define_key associates the key sequence seq with the function pointer f in the keymap specified by km. Upon success, it returns zero, otherwise it returns a negative integer upon error. See Also SLkm_define_keysym, SLang_define_key 11.2. SLang_define_key Synopsis Define a key in a keymap Usage int SLang_define_key(char *seq, char *fun, SLKeyMap_List_Type *km) Description SLang_define_key associates the key sequence seq with the function whose name is fun in the keymap specified by km. See Also SLkm_define_keysym, SLkm_define_key 11.3. SLkm_define_keysym Synopsis Define a keysym in a keymap Usage int SLkm_define_keysym (seq, ks, km) char *seq; unsigned int ks; SLKeyMap_List_Type *km; Description SLkm_define_keysym associates the key sequence seq with the keysym ks in the keymap km. Keysyms whose value is less than or equal to 0x1000 is reserved by the library and should not be used. See Also SLkm_define_key, SLang_define_key 11.4. SLang_undefine_key Synopsis Undefined a key from a keymap Usage void SLang_undefine_key(char *seq, SLKeyMap_List_Type *km); Description SLang_undefine_key removes the key sequence seq from the keymap km. See Also SLang_define_key 11.5. SLang_create_keymap Synopsis Create a new keymap Usage SLKeyMap_List_Type *SLang_create_keymap (name, km) char *name; SLKeyMap_List_Type *km; Description SLang_create_keymap creates a new keymap called name by copying the key definitions from the keymap km. If km is NULL, the newly created keymap will be empty and it is up to the calling routine to initialize it via the SLang_define_key and SLkm_define_keysym functions. SLang_create_keymap returns a pointer to the new keymap, or NULL upon failure. See Also SLang_define_key, SLkm_define_keysym 11.6. SLang_do_key Synopsis Read a keysequence and return its keymap entry Usage SLang_Key_Type *SLang_do_key (kml, getkey) SLKeyMap_List_Type *kml; int (*getkey)(void); Description The SLang_do_key function reads characters using the function specified by the getkey function pointer and uses the key sequence to return the appropriate entry in the keymap specified by kml. SLang_do_key returns NULL if the key sequence is not defined by the keymap, otherwise it returns a pointer to an object of type SLang_Key_Type, which is defined in slang.h as #define SLANG_MAX_KEYMAP_KEY_SEQ 14 typedef struct SLang_Key_Type { struct SLang_Key_Type *next; union { char *s; FVOID_STAR f; unsigned int keysym; } f; unsigned char type; /* type of function */ #define SLKEY_F_INTERPRET 0x01 #define SLKEY_F_INTRINSIC 0x02 #define SLKEY_F_KEYSYM 0x03 unsigned char str[SLANG_MAX_KEYMAP_KEY_SEQ + 1];/* key sequence */ } SLang_Key_Type; The type field specifies which field of the union f should be used. If type is SLKEY_F_INTERPRET, then f.s is a string that should be passed to the interpreter for evaluation. If type is SLKEY_F_IN- TRINSIC, then f.f refers to function that should be called. Other- wise, type is SLKEY_F_KEYSYM and f.keysym represents the value of the keysym that is associated with the key sequence. See Also SLkm_define_keysym, SLkm_define_key 11.7. SLang_find_key_function Synopsis Obtain a function pointer associated with a keymap Usage FVOID_STAR SLang_find_key_function (fname, km); char *fname; SLKeyMap_List_Type *km; Description The SLang_find_key_function routine searches through the SLKeymap_Function_Type list of functions associated with the keymap km for the function with name fname. If a matching function is found, a pointer to the function will be returned, otherwise SLang_find_key_function will return NULL. See Also SLang_create_keymap, SLang_find_keymap 11.8. SLang_find_keymap Synopsis Find a keymap Usage SLKeyMap_List_Type *SLang_find_keymap (char *keymap_name); Description The SLang_find_keymap function searches through the list of keymaps looking for one whose name is keymap_name. If a matching keymap is found, the function returns a pointer to the keymap. It returns NULL if no such keymap exists. See Also SLang_create_keymap, SLang_find_key_function 11.9. SLang_process_keystring Synopsis Un-escape a key-sequence Usage char *SLang_process_keystring (char *kseq); Description The SLang_process_keystring function converts an escaped key sequence to its raw form by converting two-character combinations such as ^A to the single character Ctrl-A (ASCII 1). In addition, if the key sequence contains constructs such as ^(XX), where XX represents a two-character termcap specifier, the termcap escape sequence will be looked up and substituted. Upon success, SLang_process_keystring returns a raw key-sequence whose first character represents the total length of the key- sequence, including the length specifier itself. It returns NULL upon failure. Example Consider the following examples: SLang_process_keystring ("^X^C"); SLang_process_keystring ("^[[A"); The first example will return a pointer to a buffer of three char- acters whose ASCII values are given by {3,24,3}. Similarly, the second example will return a pointer to the four characters {4,27,91,65}. Finally, the result of SLang_process_keystring ("^[^(ku)"); will depend upon the termcap/terminfo capability "ku", which repre- sents the escape sequence associated with the terminal's UP arrow key. For an ANSI terminal whose UP arrow produces "ESC [ A", the result will be 5,27,27,91,65. Notes SLang_process_keystring returns a pointer to a static area that will be overwritten on subsequent calls. See Also SLang_define_key, SLang_make_keystring 11.10. SLang_make_keystring Synopsis Make a printable key sequence Usage char *SLang_make_keystring (unsigned char *ks); Description The SLang_make_keystring function takes a raw key sequence ks and converts it to a printable form by converting characters such as ASCII 1 (ctrl-A) to ^A. That is, it performs the opposite function of SLang_process_keystring. Notes This function returns a pointer to a static area that will be overwritten on the next call to SLang_make_keystring. See Also SLang_process_keystring 12. Undocumented Functions The following functions are not yet documented: 12.1. SLprep_open_prep Synopsis ?? Usage int SLprep_open_prep (SLPreprocess_Type *); Description ?? See Also ?? 12.2. SLprep_close_prep Synopsis ?? Usage void SLprep_close_prep (SLPreprocess_Type *); Description ?? See Also ?? 12.3. SLprep_line_ok Synopsis ?? Usage int SLprep_line_ok (char *, SLPreprocess_Type *); Description ?? See Also ?? 12.4. SLdefine_for_ifdef Synopsis ?? Usage int SLdefine_for_ifdef (char *); Description ?? See Also ?? 12.5. SLang_Read_Line_Type * SLang_rline_save_line (SLang_RLine_Info_Type *); Synopsis ?? Usage SLang_Read_Line_Type * SLang_rline_save_line (SLang_RLine_Info_Type *); Description ?? See Also ?? 12.6. int SLang_init_readline (SLang_RLine_Info_Type *); Synopsis ?? Usage int SLang_init_readline (SLang_RLine_Info_Type *); Description ?? See Also ?? 12.7. int SLang_read_line (SLang_RLine_Info_Type *); Synopsis ?? Usage int SLang_read_line (SLang_RLine_Info_Type *); Description ?? See Also ?? 12.8. int SLang_rline_insert (char *); Synopsis ?? Usage int SLang_rline_insert (char *); Description ?? See Also ?? 12.9. void SLrline_redraw (SLang_RLine_Info_Type *); Synopsis ?? Usage void SLrline_redraw (SLang_RLine_Info_Type *); Description ?? See Also ?? 12.10. int SLtt_flush_output (void); Synopsis ?? Usage int SLtt_flush_output (void); Description ?? See Also ?? 12.11. void SLtt_set_scroll_region(int, int); Synopsis ?? Usage void SLtt_set_scroll_region(int, int); Description ?? See Also ?? 12.12. void SLtt_reset_scroll_region(void); Synopsis ?? Usage void SLtt_reset_scroll_region(void); Description ?? See Also ?? 12.13. void SLtt_reverse_video (int); Synopsis ?? Usage void SLtt_reverse_video (int); Description ?? See Also ?? 12.14. void SLtt_bold_video (void); Synopsis ?? Usage void SLtt_bold_video (void); Description ?? See Also ?? 12.15. void SLtt_begin_insert(void); Synopsis ?? Usage void SLtt_begin_insert(void); Description ?? See Also ?? 12.16. void SLtt_end_insert(void); Synopsis ?? Usage void SLtt_end_insert(void); Description ?? See Also ?? 12.17. void SLtt_del_eol(void); Synopsis ?? Usage void SLtt_del_eol(void); Description ?? See Also ?? 12.18. void SLtt_goto_rc (int, int); Synopsis ?? Usage void SLtt_goto_rc (int, int); Description ?? See Also ?? 12.19. void SLtt_delete_nlines(int); Synopsis ?? Usage void SLtt_delete_nlines(int); Description ?? See Also ?? 12.20. void SLtt_delete_char(void); Synopsis ?? Usage void SLtt_delete_char(void); Description ?? See Also ?? 12.21. void SLtt_erase_line(void); Synopsis ?? Usage void SLtt_erase_line(void); Description ?? See Also ?? 12.22. void SLtt_normal_video(void); Synopsis ?? Usage void SLtt_normal_video(void); Description ?? See Also ?? 12.23. void SLtt_cls(void); Synopsis ?? Usage void SLtt_cls(void); Description ?? See Also ?? 12.24. void SLtt_beep(void); Synopsis ?? Usage void SLtt_beep(void); Description ?? See Also ?? 12.25. void SLtt_reverse_index(int); Synopsis ?? Usage void SLtt_reverse_index(int); Description ?? See Also ?? 12.26. void SLtt_smart_puts(unsigned short *, unsigned short *, int, int); Synopsis ?? Usage void SLtt_smart_puts(unsigned short *, unsigned short *, int, int); Description ?? See Also ?? 12.27. void SLtt_write_string (char *); Synopsis ?? Usage void SLtt_write_string (char *); Description ?? See Also ?? 12.28. void SLtt_putchar(char); Synopsis ?? Usage void SLtt_putchar(char); Description ?? See Also ?? 12.29. int SLtt_init_video (void); Synopsis ?? Usage int SLtt_init_video (void); Description ?? See Also ?? 12.30. int SLtt_reset_video (void); Synopsis ?? Usage int SLtt_reset_video (void); Description ?? See Also ?? 12.31. void SLtt_get_terminfo(void); Synopsis ?? Usage void SLtt_get_terminfo(void); Description ?? See Also ?? 12.32. void SLtt_get_screen_size (void); Synopsis ?? Usage void SLtt_get_screen_size (void); Description ?? See Also ?? 12.33. int SLtt_set_cursor_visibility (int); Synopsis ?? Usage int SLtt_set_cursor_visibility (int); Description ?? See Also ?? 12.34. int SLtt_initialize (char *); Synopsis ?? Usage int SLtt_initialize (char *); Description ?? See Also ?? 12.35. void SLtt_enable_cursor_keys(void); Synopsis ?? Usage void SLtt_enable_cursor_keys(void); Description ?? See Also ?? 12.36. void SLtt_set_term_vtxxx(int *); Synopsis ?? Usage void SLtt_set_term_vtxxx(int *); Description ?? See Also ?? 12.37. void SLtt_set_color_esc (int, char *); Synopsis ?? Usage void SLtt_set_color_esc (int, char *); Description ?? See Also ?? 12.38. void SLtt_wide_width(void); Synopsis ?? Usage void SLtt_wide_width(void); Description ?? See Also ?? 12.39. void SLtt_narrow_width(void); Synopsis ?? Usage void SLtt_narrow_width(void); Description ?? See Also ?? 12.40. int SLtt_set_mouse_mode (int, int); Synopsis ?? Usage int SLtt_set_mouse_mode (int, int); Description ?? See Also ?? 12.41. void SLtt_set_alt_char_set (int); Synopsis ?? Usage void SLtt_set_alt_char_set (int); Description ?? See Also ?? 12.42. int SLtt_write_to_status_line (char *, int); Synopsis ?? Usage int SLtt_write_to_status_line (char *, int); Description ?? See Also ?? 12.43. void SLtt_disable_status_line (void); Synopsis ?? Usage void SLtt_disable_status_line (void); Description ?? See Also ?? 12.44. char *SLtt_tgetstr (char *); Synopsis ?? Usage char *SLtt_tgetstr (char *); Description ?? See Also ?? 12.45. int SLtt_tgetnum (char *); Synopsis ?? Usage int SLtt_tgetnum (char *); Description ?? See Also ?? 12.46. int SLtt_tgetflag (char *); Synopsis ?? Usage int SLtt_tgetflag (char *); Description ?? See Also ?? 12.47. char *SLtt_tigetent (char *); Synopsis ?? Usage char *SLtt_tigetent (char *); Description ?? See Also ?? 12.48. char *SLtt_tigetstr (char *, char **); Synopsis ?? Usage char *SLtt_tigetstr (char *, char **); Description ?? See Also ?? 12.49. int SLtt_tigetnum (char *, char **); Synopsis ?? Usage int SLtt_tigetnum (char *, char **); Description ?? See Also ?? 12.50. SLtt_Char_Type SLtt_get_color_object (int); Synopsis ?? Usage SLtt_Char_Type SLtt_get_color_object (int); Description ?? See Also ?? 12.51. void SLtt_set_color_object (int, SLtt_Char_Type); Synopsis ?? Usage void SLtt_set_color_object (int, SLtt_Char_Type); Description ?? See Also ?? 12.52. void SLtt_set_color (int, char *, char *, char *); Synopsis ?? Usage void SLtt_set_color (int, char *, char *, char *); Description ?? See Also ?? 12.53. void SLtt_set_mono (int, char *, SLtt_Char_Type); Synopsis ?? Usage void SLtt_set_mono (int, char *, SLtt_Char_Type); Description ?? See Also ?? 12.54. void SLtt_add_color_attribute (int, SLtt_Char_Type); Synopsis ?? Usage void SLtt_add_color_attribute (int, SLtt_Char_Type); Description ?? See Also ?? 12.55. void SLtt_set_color_fgbg (int, SLtt_Char_Type, SLtt_Char_Type); Synopsis ?? Usage void SLtt_set_color_fgbg (int, SLtt_Char_Type, SLtt_Char_Type); Description ?? See Also ?? 12.56. int SLkp_define_keysym (char *, unsigned int); Synopsis ?? Usage int SLkp_define_keysym (char *, unsigned int); Description ?? See Also ?? 12.57. int SLkp_init (void); Synopsis ?? Usage int SLkp_init (void); Description ?? See Also ?? 12.58. int SLkp_getkey (void); Synopsis ?? Usage int SLkp_getkey (void); Description ?? See Also ?? 12.59. int SLscroll_find_top (SLscroll_Window_Type *); Synopsis ?? Usage int SLscroll_find_top (SLscroll_Window_Type *); Description ?? See Also ?? 12.60. int SLscroll_find_line_num (SLscroll_Window_Type *); Synopsis ?? Usage int SLscroll_find_line_num (SLscroll_Window_Type *); Description ?? See Also ?? 12.61. unsigned int SLscroll_next_n (SLscroll_Window_Type *, unsigned int); Synopsis ?? Usage unsigned int SLscroll_next_n (SLscroll_Window_Type *, unsigned int); Description ?? See Also ?? 12.62. unsigned int SLscroll_prev_n (SLscroll_Window_Type *, unsigned int); Synopsis ?? Usage unsigned int SLscroll_prev_n (SLscroll_Window_Type *, unsigned int); Description ?? See Also ?? 12.63. int SLscroll_pageup (SLscroll_Window_Type *); Synopsis ?? Usage int SLscroll_pageup (SLscroll_Window_Type *); Description ?? See Also ?? 12.64. int SLscroll_pagedown (SLscroll_Window_Type *); Synopsis ?? Usage int SLscroll_pagedown (SLscroll_Window_Type *); Description ?? See Also ?? 12.65. SLSig_Fun_Type *SLsignal (int, SLSig_Fun_Type *); Synopsis ?? Usage SLSig_Fun_Type *SLsignal (int, SLSig_Fun_Type *); Description ?? See Also ?? 12.66. SLSig_Fun_Type *SLsignal_intr (int, SLSig_Fun_Type *); Synopsis ?? Usage SLSig_Fun_Type *SLsignal_intr (int, SLSig_Fun_Type *); Description ?? See Also ?? 12.67. int SLsig_block_signals (void); Synopsis ?? Usage int SLsig_block_signals (void); Description ?? See Also ?? 12.68. int SLsig_unblock_signals (void); Synopsis ?? Usage int SLsig_unblock_signals (void); Description ?? See Also ?? 12.69. int SLsystem (char *); Synopsis ?? Usage int SLsystem (char *); Description ?? See Also ?? 12.70. void SLadd_at_handler (long *, char *); Synopsis ?? Usage void SLadd_at_handler (long *, char *); Description ?? See Also ?? 12.71. void SLang_define_case(int *, int *); Synopsis ?? Usage void SLang_define_case(int *, int *); Description ?? See Also ?? 12.72. void SLang_init_case_tables (void); Synopsis ?? Usage void SLang_init_case_tables (void); Description ?? See Also ?? 12.73. unsigned char *SLang_regexp_match(unsigned char *, unsigned int, SLRegexp_Type *); Synopsis ?? Usage unsigned char *SLang_regexp_match(unsigned char *, unsigned int, SLRegexp_Type *); Description ?? See Also ?? 12.74. int SLang_regexp_compile (SLRegexp_Type *); Synopsis ?? Usage int SLang_regexp_compile (SLRegexp_Type *); Description ?? See Also ?? 12.75. char *SLregexp_quote_string (char *, char *, unsigned int); Synopsis ?? Usage char *SLregexp_quote_string (char *, char *, unsigned int); Description ?? See Also ?? 12.76. int SLcmd_execute_string (char *, SLcmd_Cmd_Table_Type *); Synopsis ?? Usage int SLcmd_execute_string (char *, SLcmd_Cmd_Table_Type *); Description ?? See Also ?? 12.77. SLcomplex_abs Synopsis Returns the norm of a complex number Usage double SLcomplex_abs (double *z)} Description The SLcomplex_abs function returns the absolute value or the norm of the complex number given by z. See Also SLcomplex_times 12.78. double *SLcomplex_times (double *, double *, double *); Synopsis ?? Usage double *SLcomplex_times (double *, double *, double *); Description ?? See Also ?? 12.79. double *SLcomplex_divide (double *, double *, double *); Synopsis ?? Usage double *SLcomplex_divide (double *, double *, double *); Description ?? See Also ?? 12.80. double *SLcomplex_sin (double *, double *); Synopsis ?? Usage double *SLcomplex_sin (double *, double *); Description ?? See Also ?? 12.81. double *SLcomplex_cos (double *, double *); Synopsis ?? Usage double *SLcomplex_cos (double *, double *); Description ?? See Also ?? 12.82. double *SLcomplex_tan (double *, double *); Synopsis ?? Usage double *SLcomplex_tan (double *, double *); Description ?? See Also ?? 12.83. double *SLcomplex_asin (double *, double *); Synopsis ?? Usage double *SLcomplex_asin (double *, double *); Description ?? See Also ?? 12.84. double *SLcomplex_acos (double *, double *); Synopsis ?? Usage double *SLcomplex_acos (double *, double *); Description ?? See Also ?? 12.85. double *SLcomplex_atan (double *, double *); Synopsis ?? Usage double *SLcomplex_atan (double *, double *); Description ?? See Also ?? 12.86. double *SLcomplex_exp (double *, double *); Synopsis ?? Usage double *SLcomplex_exp (double *, double *); Description ?? See Also ?? 12.87. double *SLcomplex_log (double *, double *); Synopsis ?? Usage double *SLcomplex_log (double *, double *); Description ?? See Also ?? 12.88. double *SLcomplex_log10 (double *, double *); Synopsis ?? Usage double *SLcomplex_log10 (double *, double *); Description ?? See Also ?? 12.89. double *SLcomplex_sqrt (double *, double *); Synopsis ?? Usage double *SLcomplex_sqrt (double *, double *); Description ?? See Also ?? 12.90. double *SLcomplex_sinh (double *, double *); Synopsis ?? Usage double *SLcomplex_sinh (double *, double *); Description ?? See Also ?? 12.91. double *SLcomplex_cosh (double *, double *); Synopsis ?? Usage double *SLcomplex_cosh (double *, double *); Description ?? See Also ?? 12.92. double *SLcomplex_tanh (double *, double *); Synopsis ?? Usage double *SLcomplex_tanh (double *, double *); Description ?? See Also ?? 12.93. double *SLcomplex_pow (double *, double *, double *); Synopsis ?? Usage double *SLcomplex_pow (double *, double *, double *); Description ?? See Also ?? 12.94. double SLmath_hypot (double x, double y); Synopsis ?? Usage double SLmath_hypot (double x, double y); Description ?? See Also ?? extern double *SLcomplex_asinh (double *, double *); 12.95. double *SLcomplex_acosh (double *, double *); Synopsis ?? Usage double *SLcomplex_acosh (double *, double *); Description ?? See Also ?? 12.96. double *SLcomplex_atanh (double *, double *); Synopsis ?? Usage double *SLcomplex_atanh (double *, double *); Description ?? See Also ?? 12.97. char *SLdebug_malloc (unsigned long); Synopsis ?? Usage char *SLdebug_malloc (unsigned long); Description ?? See Also ?? 12.98. char *SLdebug_calloc (unsigned long, unsigned long); Synopsis ?? Usage char *SLdebug_calloc (unsigned long, unsigned long); Description ?? See Also ?? 12.99. char *SLdebug_realloc (char *, unsigned long); Synopsis ?? Usage char *SLdebug_realloc (char *, unsigned long); Description ?? See Also ?? 12.100. void SLdebug_free (char *); Synopsis ?? Usage void SLdebug_free (char *); Description ?? See Also ?? 12.101. void SLmalloc_dump_statistics (void); Synopsis ?? Usage void SLmalloc_dump_statistics (void); Description ?? See Also ?? 12.102. char *SLstrcpy(register char *, register char *); Synopsis ?? Usage char *SLstrcpy(register char *, register char *); Description ?? See Also ?? 12.103. int SLstrcmp(register char *, register char *); Synopsis ?? Usage int SLstrcmp(register char *, register char *); Description ?? See Also ?? 12.104. char *SLstrncpy(char *, register char *, register int); Synopsis ?? Usage char *SLstrncpy(char *, register char *, register int); Description ?? See Also ?? 12.105. void SLmemset (char *, char, int); Synopsis ?? Usage void SLmemset (char *, char, int); Description ?? See Also ?? 12.106. void SLexpand_escaped_string (register char *, register char *, register char *); Synopsis ?? Usage void SLexpand_escaped_string (register char *, register char *, register char *); Description ?? See Also ?? 12.107. void SLmake_lut (unsigned char *, unsigned char *, unsigned char); Synopsis ?? Usage void SLmake_lut (unsigned char *, unsigned char *, unsigned char); Description ?? See Also ?? 12.108. int SLang_guess_type (char *); Synopsis ?? Usage int SLang_guess_type (char *); Description ?? See Also ??