1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.37.2.2 2002/11/12 14:28:18 oes Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/Attic/miscutil.c,v $
6 * Purpose : zalloc, hash_string, safe_strerror, strcmpic,
7 * strncmpic, chomp, and MinGW32 strdup
9 * These are each too small to deserve their own file
10 * but don't really fit in any other file.
12 * Copyright : Written by and Copyright (C) 2001 the SourceForge
13 * Privoxy team. http://www.privoxy.org/
15 * Based on the Internet Junkbuster originally written
16 * by and Copyright (C) 1997 Anonymous Coders and
17 * Junkbusters Corporation. http://www.junkbusters.com
19 * This program is free software; you can redistribute it
20 * and/or modify it under the terms of the GNU General
21 * Public License as published by the Free Software
22 * Foundation; either version 2 of the License, or (at
23 * your option) any later version.
25 * This program is distributed in the hope that it will
26 * be useful, but WITHOUT ANY WARRANTY; without even the
27 * implied warranty of MERCHANTABILITY or FITNESS FOR A
28 * PARTICULAR PURPOSE. See the GNU General Public
29 * License for more details.
31 * The GNU General Public License should be included with
32 * this file. If not, you can view it at
33 * http://www.gnu.org/copyleft/gpl.html
34 * or write to the Free Software Foundation, Inc., 59
35 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 * $Log: miscutil.c,v $
39 * Revision 1.37.2.2 2002/11/12 14:28:18 oes
40 * Proper backtracking in simplematch; fixes bug #632888
42 * Revision 1.37.2.1 2002/09/25 12:58:51 oes
43 * Made strcmpic and strncmpic safe against NULL arguments
44 * (which are now treated as empty strings).
46 * Revision 1.37 2002/04/26 18:29:43 jongfoster
47 * Fixing this Visual C++ warning:
48 * miscutil.c(710) : warning C4090: '=' : different 'const' qualifiers
50 * Revision 1.36 2002/04/26 12:55:38 oes
51 * New function string_toupper
53 * Revision 1.35 2002/03/26 22:29:55 swa
54 * we have a new homepage!
56 * Revision 1.34 2002/03/24 13:25:43 swa
57 * name change related issues
59 * Revision 1.33 2002/03/07 03:46:53 oes
60 * Fixed compiler warnings etc
62 * Revision 1.32 2002/03/06 23:02:57 jongfoster
65 * Revision 1.31 2002/03/05 04:52:42 oes
66 * Deleted non-errlog debugging code
68 * Revision 1.30 2002/03/04 18:27:42 oes
69 * - Deleted deletePidFile
70 * - Made write_pid_file use the --pidfile option value
71 * (or no PID file, if the option was absent)
72 * - Played styleguide police
74 * Revision 1.29 2002/03/04 02:08:02 david__schmidt
75 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
77 * Revision 1.28 2002/03/03 09:18:03 joergs
78 * Made jumbjuster work on AmigaOS again.
80 * Revision 1.27 2002/01/21 00:52:32 jongfoster
81 * Adding string_join()
83 * Revision 1.26 2001/12/30 14:07:32 steudten
84 * - Add signal handling (unix)
85 * - Add SIGHUP handler (unix)
86 * - Add creation of pidfile (unix)
87 * - Add action 'top' in rc file (RH)
88 * - Add entry 'SIGNALS' to manpage
89 * - Add exit message to logfile (unix)
91 * Revision 1.25 2001/11/13 00:16:38 jongfoster
92 * Replacing references to malloc.h with the standard stdlib.h
93 * (See ANSI or K&R 2nd Ed)
95 * Revision 1.24 2001/11/05 21:41:43 steudten
96 * Add changes to be a real daemon just for unix os.
97 * (change cwd to /, detach from controlling tty, set
98 * process group and session leader to the own process.
100 * Add some fatal-error log message for failed malloc().
101 * Add '-d' if compiled with 'configure --with-debug' to
102 * enable debug output.
104 * Revision 1.23 2001/10/29 03:48:10 david__schmidt
105 * OS/2 native needed a snprintf() routine. Added one to miscutil, brackedted
106 * by and __OS2__ ifdef.
108 * Revision 1.22 2001/10/26 17:39:38 oes
109 * Moved ijb_isspace and ijb_tolower to project.h
111 * Revision 1.21 2001/10/23 21:27:50 jongfoster
112 * Standardising error codes in string_append
113 * make_path() no longer adds '\\' if the dir already ends in '\\' (this
114 * is just copying a UNIX-specific fix to the Windows-specific part)
116 * Revision 1.20 2001/10/22 15:33:56 david__schmidt
117 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
118 * filters.c. Added a FIXME in front of the offending code. I'll gladly
119 * put in a better/more robust fix for all parties if one is presented...
120 * It seems that just returning 200 instead of 404 would pretty much fix
121 * it for everyone, but I don't know all the history of the problem.
123 * Revision 1.19 2001/10/14 22:02:57 jongfoster
124 * New function string_append() which is like strsav(), but running
125 * out of memory isn't automatically FATAL.
127 * Revision 1.18 2001/09/20 13:33:43 steudten
129 * change long to int as return value in hash_string(). Remember the wraparound
130 * for int = long = sizeof(4) - thats maybe not what we want.
132 * Revision 1.17 2001/09/13 20:51:29 jongfoster
133 * Fixing potential problems with characters >=128 in simplematch()
134 * This was also a compiler warning.
136 * Revision 1.16 2001/09/10 10:56:59 oes
137 * Silenced compiler warnings
139 * Revision 1.15 2001/07/13 14:02:24 oes
140 * Removed vim-settings
142 * Revision 1.14 2001/06/29 21:45:41 oes
143 * Indentation, CRLF->LF, Tab-> Space
145 * Revision 1.13 2001/06/29 13:32:14 oes
146 * Removed logentry from cancelled commit
148 * Revision 1.12 2001/06/09 10:55:28 jongfoster
149 * Changing BUFSIZ ==> BUFFER_SIZE
151 * Revision 1.11 2001/06/07 23:09:19 jongfoster
152 * Cosmetic indentation changes.
154 * Revision 1.10 2001/06/07 14:51:38 joergs
155 * make_path() no longer adds '/' if the dir already ends in '/'.
157 * Revision 1.9 2001/06/07 14:43:17 swa
158 * slight mistake in make_path, unix path style is /.
160 * Revision 1.8 2001/06/05 22:32:01 jongfoster
161 * New function make_path() to splice directory and file names together.
163 * Revision 1.7 2001/06/03 19:12:30 oes
164 * introduced bindup()
166 * Revision 1.6 2001/06/01 18:14:49 jongfoster
167 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
168 * in config.h if appropriate) rather than the NO_STRERR macro.
170 * Revision 1.5 2001/06/01 10:31:51 oes
171 * Added character class matching to trivimatch; renamed to simplematch
173 * Revision 1.4 2001/05/31 17:32:31 oes
175 * - Enhanced domain part globbing with infix and prefix asterisk
176 * matching and optional unanchored operation
178 * Revision 1.3 2001/05/29 23:10:09 oes
181 * - Introduced chomp()
182 * - Moved strsav() from showargs to miscutil
184 * Revision 1.2 2001/05/29 09:50:24 jongfoster
185 * Unified blocklist/imagelist/permissionslist.
186 * File format is still under discussion, but the internal changes
189 * Also modified interceptor behaviour:
190 * - We now intercept all URLs beginning with one of the following
191 * prefixes (and *only* these prefixes):
193 * * http://ijbswa.sf.net/config/
194 * * http://ijbswa.sourceforge.net/config/
195 * - New interceptors "home page" - go to http://i.j.b/ to see it.
196 * - Internal changes so that intercepted and fast redirect pages
197 * are not replaced with an image.
198 * - Interceptors now have the option to send a binary page direct
199 * to the client. (i.e. ijb-send-banner uses this)
200 * - Implemented show-url-info interceptor. (Which is why I needed
201 * the above interceptors changes - a typical URL is
202 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
203 * The previous mechanism would not have intercepted that, and
204 * if it had been intercepted then it then it would have replaced
207 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
208 * Initial import of version 2.9.3 source tree
211 *********************************************************************/
217 #include <sys/types.h>
219 #if !defined(_WIN32) && !defined(__OS2__)
221 #endif /* #if !defined(_WIN32) && !defined(__OS2__) */
227 #include "miscutil.h"
231 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
233 /*********************************************************************
237 * Description : Malloc some memory and set it to '\0'.
238 * The way calloc() ought to be -acjc
241 * 1 : size = Size of memory chunk to return.
243 * Returns : Pointer to newly malloc'd memory chunk.
245 *********************************************************************/
246 void *zalloc(size_t size)
250 if ((ret = (void *)malloc(size)) != NULL)
252 memset(ret, 0, size);
261 /*********************************************************************
263 * Function : write_pid_file
265 * Description : Writes a pid file with the pid of the main process
271 *********************************************************************/
272 void write_pid_file(void)
277 * If no --pidfile option was given,
278 * we can live without one.
280 if (pidfile == NULL) return;
282 if ((fp = fopen(pidfile, "w")) == NULL)
284 log_error(LOG_LEVEL_INFO, "can't open pidfile '%s': %E", pidfile);
288 fprintf(fp, "%u\n", (unsigned int) getpid());
294 #endif /* def unix */
297 /*********************************************************************
299 * Function : hash_string
301 * Description : Take a string and compute a (hopefuly) unique numeric
302 * integer value. This has several uses, but being able
303 * to "switch" a string the one of my favorites.
306 * 1 : s : string to be hashed.
308 * Returns : an unsigned long variable with the hashed value.
310 *********************************************************************/
311 unsigned int hash_string( const char* s )
326 /*********************************************************************
330 * Description : For some reason (which is beyond me), gcc and WIN32
331 * don't like strdup. When a "free" is executed on a
332 * strdup'd ptr, it can at times freez up! So I just
333 * replaced it and problem was solved.
336 * 1 : s = string to duplicate
338 * Returns : Pointer to newly malloc'ed copy of the string.
340 *********************************************************************/
341 char *strdup( const char *s )
343 char * result = (char *)malloc( strlen(s)+1 );
353 #endif /* def __MINGW32__ */
357 /*********************************************************************
359 * Function : safe_strerror
361 * Description : Variant of the library routine strerror() which will
362 * work on systems without the library routine, and
363 * which should never return NULL.
366 * 1 : err = the `errno' of the last operation.
368 * Returns : An "English" string of the last `errno'. Allocated
369 * with strdup(), so caller frees. May be NULL if the
370 * system is out of memory.
372 *********************************************************************/
373 char *safe_strerror(int err)
376 char buf[BUFFER_SIZE];
381 #endif /* HAVE_STRERROR */
385 sprintf(buf, "(errno = %d)", err);
394 /*********************************************************************
396 * Function : strcmpic
398 * Description : Case insensitive string comparison
401 * 1 : s1 = string 1 to compare
402 * 2 : s2 = string 2 to compare
404 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
406 *********************************************************************/
407 int strcmpic(const char *s1, const char *s2)
414 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
420 return(ijb_tolower(*s1) - ijb_tolower(*s2));
425 /*********************************************************************
427 * Function : strncmpic
429 * Description : Case insensitive string comparison (upto n characters)
432 * 1 : s1 = string 1 to compare
433 * 2 : s2 = string 2 to compare
434 * 3 : n = maximum characters to compare
436 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
438 *********************************************************************/
439 int strncmpic(const char *s1, const char *s2, size_t n)
441 if (n <= 0) return(0);
447 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
456 return(ijb_tolower(*s1) - ijb_tolower(*s2));
461 /*********************************************************************
465 * Description : In-situ-eliminate all leading and trailing whitespace
469 * 1 : s : string to be chomped.
471 * Returns : chomped string
473 *********************************************************************/
474 char *chomp(char *string)
479 * strip trailing whitespace
481 p = string + strlen(string);
482 while (p > string && ijb_isspace(*(p-1)))
489 * find end of leading whitespace
492 while (*q && ijb_isspace(*q))
498 * if there was any, move the rest forwards
513 /*********************************************************************
517 * Description : Reallocate "old" and append text to it. This makes
518 * it easier to append to malloc'd strings.
519 * Running out of memory is a FATAL error.
522 * 1 : old = Old text that is to be extended. Will be
523 * free()d by this routine. May be NULL.
524 * 2 : text_to_append = Text to be appended to old.
527 * Returns : Pointer to newly malloc'ed appended string.
528 * If there is no text to append, return old. Caller
531 *********************************************************************/
532 char *strsav(char *old, const char *text_to_append)
534 size_t old_len, new_len = 0;
537 if ((text_to_append == NULL) || (*text_to_append == '\0'))
544 if ((p = strdup(text_to_append)) == NULL)
546 log_error(LOG_LEVEL_FATAL, "strdup() failed!");
547 /* Never get here - LOG_LEVEL_FATAL causes program exit */
552 old_len = strlen(old);
553 new_len = old_len + strlen(text_to_append) + 1;
555 if ((p = realloc(old, new_len)) == NULL)
557 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
558 /* Never get here - LOG_LEVEL_FATAL causes program exit */
561 strcpy(p + old_len, text_to_append);
566 /*********************************************************************
568 * Function : string_append
570 * Description : Reallocate target_string and append text to it.
571 * This makes it easier to append to malloc'd strings.
572 * This is similar to the (removed) strsav(), but
573 * running out of memory isn't catastrophic.
577 * The following style provides sufficient error
578 * checking for this routine, with minimal clutter
579 * in the source code. It is recommended if you
580 * have many calls to this function:
582 * char * s = strdup(...); // don't check for error
583 * string_append(&s, ...); // don't check for error
584 * string_append(&s, ...); // don't check for error
585 * string_append(&s, ...); // don't check for error
586 * if (NULL == s) { ... handle error ... }
590 * char * s = strdup(...); // don't check for error
591 * string_append(&s, ...); // don't check for error
592 * string_append(&s, ...); // don't check for error
593 * if (string_append(&s, ...)) {... handle error ...}
596 * 1 : target_string = Pointer to old text that is to be
597 * extended. *target_string will be free()d by this
598 * routine. target_string must be non-NULL.
599 * If *target_string is NULL, this routine will
600 * do nothing and return with an error - this allows
601 * you to make many calls to this routine and only
602 * check for errors after the last one.
603 * 2 : text_to_append = Text to be appended to old.
606 * Returns : JB_ERR_OK on success, and sets *target_string
607 * to newly malloc'ed appended string. Caller
608 * must free(*target_string).
609 * JB_ERR_MEMORY on out-of-memory. (And free()s
610 * *target_string and sets it to NULL).
611 * JB_ERR_MEMORY if *target_string is NULL.
613 *********************************************************************/
614 jb_err string_append(char **target_string, const char *text_to_append)
619 assert(target_string);
620 assert(text_to_append);
622 if (*target_string == NULL)
624 return JB_ERR_MEMORY;
627 if (*text_to_append == '\0')
632 old_len = strlen(*target_string);
634 if (NULL == (new_string = realloc(*target_string,
635 strlen(text_to_append) + old_len + 1)))
637 free(*target_string);
639 *target_string = NULL;
640 return JB_ERR_MEMORY;
643 strcpy(new_string + old_len, text_to_append);
645 *target_string = new_string;
650 /*********************************************************************
652 * Function : string_join
654 * Description : Join two strings together. Frees BOTH the original
655 * strings. If either or both input strings are NULL,
656 * fails as if it had run out of memory.
658 * For comparison, string_append requires that the
659 * second string is non-NULL, and doesn't free it.
661 * Rationale: Too often, we want to do
662 * string_append(s, html_encode(s2)). That assert()s
663 * if s2 is NULL or if html_encode() runs out of memory.
664 * It also leaks memory. Proper checking is cumbersome.
665 * The solution: string_join(s, html_encode(s2)) is safe,
666 * and will free the memory allocated by html_encode().
669 * 1 : target_string = Pointer to old text that is to be
670 * extended. *target_string will be free()d by this
671 * routine. target_string must be non-NULL.
672 * 2 : text_to_append = Text to be appended to old.
674 * Returns : JB_ERR_OK on success, and sets *target_string
675 * to newly malloc'ed appended string. Caller
676 * must free(*target_string).
677 * JB_ERR_MEMORY on out-of-memory, or if
678 * *target_string or text_to_append is NULL. (In
679 * this case, frees *target_string and text_to_append,
680 * sets *target_string to NULL).
682 *********************************************************************/
683 jb_err string_join(char **target_string, char *text_to_append)
687 assert(target_string);
689 if (text_to_append == NULL)
691 freez(*target_string);
692 return JB_ERR_MEMORY;
695 err = string_append(target_string, text_to_append);
697 free(text_to_append);
703 /*********************************************************************
705 * Function : string_toupper
707 * Description : Produce a copy of string with all convertible
708 * characters converted to uppercase.
711 * 1 : string = string to convert
713 * Returns : Uppercase copy of string if possible,
714 * NULL on out-of-memory or if string was NULL.
716 *********************************************************************/
717 char *string_toupper(const char *string)
722 if (!string || ((result = (char *) zalloc(strlen(string) + 1)) == NULL))
732 *p++ = toupper(*q++);
740 /*********************************************************************
742 * Function : simplematch
744 * Description : String matching, with a (greedy) '*' wildcard that
745 * stands for zero or more arbitrary characters and
746 * character classes in [], which take both enumerations
750 * 1 : pattern = pattern for matching
751 * 2 : text = text to be matched
753 * Returns : 0 if match, else nonzero
755 *********************************************************************/
756 int simplematch(char *pattern, char *text)
758 unsigned char *pat = (unsigned char *) pattern;
759 unsigned char *txt = (unsigned char *) text;
760 unsigned char *fallback = pat;
763 unsigned char lastchar = 'a';
765 unsigned char charmap[32];
770 /* EOF pattern but !EOF text? */
776 /* '*' in the pattern? */
780 /* The pattern ends afterwards? Speed up the return. */
786 /* Else, set wildcard mode and remember position after '*' */
791 /* Character range specification? */
794 memset(charmap, '\0', sizeof(charmap));
796 while (*++pat != ']')
802 else if (*pat == '-')
804 if ((*++pat == ']') || *pat == '\0')
808 for(i = lastchar; i <= *pat; i++)
810 charmap[i / 8] |= (1 << (i % 8));
815 charmap[*pat / 8] |= (1 << (*pat % 8));
819 } /* -END- if Character range specification */
823 * Char match, or char range match?
827 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
837 * No match && no wildcard: No luck
841 else if (pat != fallback)
844 * Wildcard mode && nonmatch beyond fallback: Rewind pattern
852 /* Cut off extra '*'s */
853 if(*pat == '*') pat++;
855 /* If this is the pattern's end, fine! */
861 /*********************************************************************
865 * Description : Duplicate the first n characters of a string that may
866 * contain '\0' characters.
869 * 1 : string = string to be duplicated
870 * 2 : len = number of bytes to duplicate
872 * Returns : pointer to copy, or NULL if failiure
874 *********************************************************************/
875 char *bindup(const char *string, size_t len)
879 if (NULL == (duplicate = (char *)malloc(len)))
885 memcpy(duplicate, string, len);
893 /*********************************************************************
895 * Function : make_path
897 * Description : Takes a directory name and a file name, returns
898 * the complete path. Handles windows/unix differences.
899 * If the file name is already an absolute path, or if
900 * the directory name is NULL or empty, it returns
904 * 1 : dir: Name of directory or NULL for none.
905 * 2 : file: Name of file. Should not be NULL or empty.
907 * Returns : "dir/file" (Or on windows, "dir\file").
908 * It allocates the string on the heap. Caller frees.
909 * Returns NULL in error (i.e. NULL file or out of
912 *********************************************************************/
913 char * make_path(const char * dir, const char * file)
924 strncpy(path,dir+2,512);
928 strncpy(path,dir+1,512);
933 strncpy(path,dir,512);
939 if(AddPart(path,file,512))
945 #else /* ndef AMIGA */
947 if ((file == NULL) || (*file == '\0'))
949 return NULL; /* Error */
952 if ((dir == NULL) || (*dir == '\0') /* No directory specified */
953 #if defined(_WIN32) || defined(__OS2__)
954 || (*file == '\\') || (file[1] == ':') /* Absolute path (DOS) */
955 #else /* ifndef _WIN32 || __OS2__ */
956 || (*file == '/') /* Absolute path (U*ix) */
957 #endif /* ifndef _WIN32 || __OS2__ */
967 if ( *dir != '/' && basedir && *basedir )
969 path = malloc( strlen( basedir ) + strlen(dir) + strlen(file) + 3);
970 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
971 strcpy(path, basedir);
977 path = malloc(strlen(dir) + strlen(file) + 2);
978 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
983 path = malloc(strlen(dir) + strlen(file) + 2);
984 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
987 #endif /* defined unix */
989 #if defined(_WIN32) || defined(__OS2__)
990 if(path[strlen(path)-1] != '\\')
994 #else /* ifndef _WIN32 || __OS2__ */
995 if(path[strlen(path)-1] != '/')
999 #endif /* ifndef _WIN32 || __OS2__ */
1004 #endif /* ndef AMIGA */
1009 * What follows is a portable snprintf routine, written by Mark Martinec.
1010 * See: http://www.ijs.si/software/snprintf/
1011 * Anyone who needs it can add a define for themselves... so far, only
1012 * OS/2 (native) lacks snprintf.
1015 - a portable implementation of snprintf,
1016 including vsnprintf.c, asnprintf, vasnprintf, asprintf, vasprintf
1018 snprintf is a routine to convert numeric and string arguments to
1019 formatted strings. It is similar to sprintf(3) provided in a system's
1020 C library, yet it requires an additional argument - the buffer size -
1021 and it guarantees never to store anything beyond the given buffer,
1022 regardless of the format or arguments to be formatted. Some newer
1023 operating systems do provide snprintf in their C library, but many do
1024 not or do provide an inadequate (slow or idiosyncratic) version, which
1025 calls for a portable implementation of this routine.
1029 Mark Martinec <mark.martinec@ijs.si>, April 1999, June 2000
1030 Copyright © 1999, Mark Martinec
1036 #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
1037 #define PORTABLE_SNPRINTF_VERSION_MINOR 2
1039 #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
1040 # if defined(NEED_SNPRINTF_ONLY)
1041 # undef NEED_SNPRINTF_ONLY
1043 # if !defined(PREFER_PORTABLE_SNPRINTF)
1044 # define PREFER_PORTABLE_SNPRINTF
1048 #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
1049 #define SOLARIS_COMPATIBLE
1052 #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1053 #define HPUX_COMPATIBLE
1056 #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
1057 #define DIGITAL_UNIX_COMPATIBLE
1060 #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
1061 #define PERL_COMPATIBLE
1064 #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
1065 #define LINUX_COMPATIBLE
1068 #include <sys/types.h>
1079 #define isdigit(c) ((c) >= '0' && (c) <= '9')
1081 /* For copying strings longer or equal to 'breakeven_point'
1082 * it is more efficient to call memcpy() than to do it inline.
1083 * The value depends mostly on the processor architecture,
1084 * but also on the compiler and its optimization capabilities.
1085 * The value is not critical, some small value greater than zero
1086 * will be just fine if you don't care to squeeze every drop
1087 * of performance out of the code.
1089 * Small values favor memcpy, large values favor inline code.
1091 #if defined(__alpha__) || defined(__alpha)
1092 # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
1094 #if defined(__i386__) || defined(__i386)
1095 # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
1098 # define breakeven_point 10 /* HP-PA - gcc */
1100 #if defined(__sparc__) || defined(__sparc)
1101 # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
1104 /* some other values of possible interest: */
1105 /* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
1106 /* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
1108 #ifndef breakeven_point
1109 # define breakeven_point 6 /* some reasonable one-size-fits-all value */
1112 #define fast_memcpy(d,s,n) \
1113 { register size_t nn = (size_t)(n); \
1114 if (nn >= breakeven_point) memcpy((d), (s), nn); \
1115 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1116 register char *dd; register const char *ss; \
1117 for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
1119 #define fast_memset(d,c,n) \
1120 { register size_t nn = (size_t)(n); \
1121 if (nn >= breakeven_point) memset((d), (int)(c), nn); \
1122 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1123 register char *dd; register const int cc=(int)(c); \
1124 for (dd=(d); nn>0; nn--) *dd++ = cc; } }
1128 #if defined(NEED_ASPRINTF)
1129 int asprintf (char **ptr, const char *fmt, /*args*/ ...);
1131 #if defined(NEED_VASPRINTF)
1132 int vasprintf (char **ptr, const char *fmt, va_list ap);
1134 #if defined(NEED_ASNPRINTF)
1135 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
1137 #if defined(NEED_VASNPRINTF)
1138 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
1141 #if defined(HAVE_SNPRINTF)
1142 /* declare our portable snprintf routine under name portable_snprintf */
1143 /* declare our portable vsnprintf routine under name portable_vsnprintf */
1145 /* declare our portable routines under names snprintf and vsnprintf */
1146 #define portable_snprintf snprintf
1147 #if !defined(NEED_SNPRINTF_ONLY)
1148 #define portable_vsnprintf vsnprintf
1152 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1153 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
1154 #if !defined(NEED_SNPRINTF_ONLY)
1155 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
1161 static char credits[] = "\n\
1162 @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
1163 @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
1164 @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
1166 #if defined(NEED_ASPRINTF)
1167 int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
1173 va_start(ap, fmt); /* measure the required size */
1174 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1176 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1177 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1178 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1182 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1184 assert(str_l2 == str_l);
1190 #if defined(NEED_VASPRINTF)
1191 int vasprintf(char **ptr, const char *fmt, va_list ap) {
1197 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1198 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1201 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1202 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1203 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1205 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1206 assert(str_l2 == str_l);
1212 #if defined(NEED_ASNPRINTF)
1213 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
1218 va_start(ap, fmt); /* measure the required size */
1219 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1221 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1222 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1223 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1224 if (str_m == 0) { /* not interested in resulting string, just return size */
1226 *ptr = (char *) malloc(str_m);
1227 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1231 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1233 assert(str_l2 == str_l);
1240 #if defined(NEED_VASNPRINTF)
1241 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
1246 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1247 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1250 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1251 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1252 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1253 if (str_m == 0) { /* not interested in resulting string, just return size */
1255 *ptr = (char *) malloc(str_m);
1256 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1258 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1259 assert(str_l2 == str_l);
1267 * If the system does have snprintf and the portable routine is not
1268 * specifically required, this module produces no code for snprintf/vsnprintf.
1270 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1272 #if !defined(NEED_SNPRINTF_ONLY)
1273 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1278 str_l = portable_vsnprintf(str, str_m, fmt, ap);
1284 #if defined(NEED_SNPRINTF_ONLY)
1285 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1287 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
1290 #if defined(NEED_SNPRINTF_ONLY)
1294 const char *p = fmt;
1296 /* In contrast with POSIX, the ISO C99 now says
1297 * that str can be NULL and str_m can be 0.
1298 * This is more useful than the old: if (str_m < 1) return -1; */
1300 #if defined(NEED_SNPRINTF_ONLY)
1306 /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
1307 /* but the following code achieves better performance for cases
1308 * where format string is long and contains few conversions */
1309 const char *q = strchr(p+1,'%');
1310 size_t n = !q ? strlen(p) : (q-p);
1311 if (str_l < str_m) {
1312 size_t avail = str_m-str_l;
1313 fast_memcpy(str+str_l, p, (n>avail?avail:n));
1317 const char *starting_p;
1318 size_t min_field_width = 0, precision = 0;
1319 int zero_padding = 0, precision_specified = 0, justify_left = 0;
1320 int alternate_form = 0, force_sign = 0;
1321 int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
1322 the ' ' flag should be ignored. */
1323 char length_modifier = '\0'; /* allowed values: \0, h, l, L */
1324 char tmp[32];/* temporary buffer for simple numeric->string conversion */
1326 const char *str_arg; /* string address in case of string argument */
1327 size_t str_arg_l; /* natural field width of arg without padding
1329 unsigned char uchar_arg;
1330 /* unsigned char argument value - only defined for c conversion.
1331 N.B. standard explicitly states the char argument for
1332 the c conversion is unsigned */
1334 size_t number_of_zeros_to_pad = 0;
1335 /* number of zeros to be inserted for numeric conversions
1336 as required by the precision or minimal field width */
1338 size_t zero_padding_insertion_ind = 0;
1339 /* index into tmp where zero padding is to be inserted */
1341 char fmt_spec = '\0';
1342 /* current conversion specifier character */
1344 str_arg = credits;/* just to make compiler happy (defined but not used)*/
1346 starting_p = p; p++; /* skip '%' */
1348 while (*p == '0' || *p == '-' || *p == '+' ||
1349 *p == ' ' || *p == '#' || *p == '\'') {
1351 case '0': zero_padding = 1; break;
1352 case '-': justify_left = 1; break;
1353 case '+': force_sign = 1; space_for_positive = 0; break;
1354 case ' ': force_sign = 1;
1355 /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
1356 #ifdef PERL_COMPATIBLE
1357 /* ... but in Perl the last of ' ' and '+' applies */
1358 space_for_positive = 1;
1361 case '#': alternate_form = 1; break;
1366 /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
1368 /* parse field width */
1371 p++; j = va_arg(ap, int);
1372 if (j >= 0) min_field_width = j;
1373 else { min_field_width = -j; justify_left = 1; }
1374 } else if (isdigit((int)(*p))) {
1375 /* size_t could be wider than unsigned int;
1376 make sure we treat argument like common implementations do */
1377 unsigned int uj = *p++ - '0';
1378 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1379 min_field_width = uj;
1381 /* parse precision */
1383 p++; precision_specified = 1;
1385 int j = va_arg(ap, int);
1387 if (j >= 0) precision = j;
1389 precision_specified = 0; precision = 0;
1391 * Solaris 2.6 man page claims that in this case the precision
1392 * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
1393 * claim that this case should be treated as unspecified precision,
1394 * which is what we do here.
1397 } else if (isdigit((int)(*p))) {
1398 /* size_t could be wider than unsigned int;
1399 make sure we treat argument like common implementations do */
1400 unsigned int uj = *p++ - '0';
1401 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1405 /* parse 'h', 'l' and 'll' length modifiers */
1406 if (*p == 'h' || *p == 'l') {
1407 length_modifier = *p; p++;
1408 if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
1409 #ifdef SNPRINTF_LONGLONG_SUPPORT
1410 length_modifier = '2'; /* double l encoded as '2' */
1412 length_modifier = 'l'; /* treat it as a single 'l' */
1418 /* common synonyms: */
1420 case 'i': fmt_spec = 'd'; break;
1421 case 'D': fmt_spec = 'd'; length_modifier = 'l'; break;
1422 case 'U': fmt_spec = 'u'; length_modifier = 'l'; break;
1423 case 'O': fmt_spec = 'o'; length_modifier = 'l'; break;
1426 /* get parameter value, do initial processing */
1428 case '%': /* % behaves similar to 's' regarding flags and field widths */
1429 case 'c': /* c behaves similar to 's' regarding flags and field widths */
1431 length_modifier = '\0'; /* wint_t and wchar_t not supported */
1432 /* the result of zero padding flag with non-numeric conversion specifier*/
1433 /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
1434 /* Digital Unix and Linux does not. */
1435 #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1436 zero_padding = 0; /* turn zero padding off for string conversions */
1443 int j = va_arg(ap, int);
1444 uchar_arg = (unsigned char) j; /* standard demands unsigned char */
1445 str_arg = (const char *) &uchar_arg;
1449 str_arg = va_arg(ap, const char *);
1450 if (!str_arg) str_arg_l = 0;
1451 /* make sure not to address string beyond the specified precision !!! */
1452 else if (!precision_specified) str_arg_l = strlen(str_arg);
1453 /* truncate string if necessary as requested by precision */
1454 else if (precision == 0) str_arg_l = 0;
1456 /* memchr on HP does not like n > 2^31 !!! */
1457 const char *q = memchr(str_arg, '\0',
1458 precision <= 0x7fffffff ? precision : 0x7fffffff);
1459 str_arg_l = !q ? precision : (q-str_arg);
1465 case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': {
1466 /* NOTE: the u, o, x, X and p conversion specifiers imply
1467 the value is unsigned; d implies a signed value */
1470 /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
1471 +1 if greater than zero (or nonzero for unsigned arguments),
1472 -1 if negative (unsigned argument is never negative) */
1474 int int_arg = 0; unsigned int uint_arg = 0;
1475 /* only defined for length modifier h, or for no length modifiers */
1477 long int long_arg = 0; unsigned long int ulong_arg = 0;
1478 /* only defined for length modifier l */
1480 void *ptr_arg = NULL;
1481 /* pointer argument value -only defined for p conversion */
1483 #ifdef SNPRINTF_LONGLONG_SUPPORT
1484 long long int long_long_arg = 0;
1485 unsigned long long int ulong_long_arg = 0;
1486 /* only defined for length modifier ll */
1488 if (fmt_spec == 'p') {
1489 /* HPUX 10: An l, h, ll or L before any other conversion character
1490 * (other than d, i, u, o, x, or X) is ignored.
1492 * not specified, but seems to behave as HPUX does.
1493 * Solaris: If an h, l, or L appears before any other conversion
1494 * specifier (other than d, i, u, o, x, or X), the behavior
1495 * is undefined. (Actually %hp converts only 16-bits of address
1496 * and %llp treats address as 64-bit data which is incompatible
1497 * with (void *) argument on a 32-bit system).
1499 #ifdef SOLARIS_COMPATIBLE
1500 # ifdef SOLARIS_BUG_COMPATIBLE
1501 /* keep length modifiers even if it represents 'll' */
1503 if (length_modifier == '2') length_modifier = '\0';
1506 length_modifier = '\0';
1508 ptr_arg = va_arg(ap, void *);
1509 if (ptr_arg != NULL) arg_sign = 1;
1510 } else if (fmt_spec == 'd') { /* signed */
1511 switch (length_modifier) {
1514 /* It is non-portable to specify a second argument of char or short
1515 * to va_arg, because arguments seen by the called function
1516 * are not char or short. C converts char and short arguments
1517 * to int before passing them to a function.
1519 int_arg = va_arg(ap, int);
1520 if (int_arg > 0) arg_sign = 1;
1521 else if (int_arg < 0) arg_sign = -1;
1524 long_arg = va_arg(ap, long int);
1525 if (long_arg > 0) arg_sign = 1;
1526 else if (long_arg < 0) arg_sign = -1;
1528 #ifdef SNPRINTF_LONGLONG_SUPPORT
1530 long_long_arg = va_arg(ap, long long int);
1531 if (long_long_arg > 0) arg_sign = 1;
1532 else if (long_long_arg < 0) arg_sign = -1;
1536 } else { /* unsigned */
1537 switch (length_modifier) {
1540 uint_arg = va_arg(ap, unsigned int);
1541 if (uint_arg) arg_sign = 1;
1544 ulong_arg = va_arg(ap, unsigned long int);
1545 if (ulong_arg) arg_sign = 1;
1547 #ifdef SNPRINTF_LONGLONG_SUPPORT
1549 ulong_long_arg = va_arg(ap, unsigned long long int);
1550 if (ulong_long_arg) arg_sign = 1;
1555 str_arg = tmp; str_arg_l = 0;
1557 * For d, i, u, o, x, and X conversions, if precision is specified,
1558 * the '0' flag should be ignored. This is so with Solaris 2.6,
1559 * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
1561 #ifndef PERL_COMPATIBLE
1562 if (precision_specified) zero_padding = 0;
1564 if (fmt_spec == 'd') {
1565 if (force_sign && arg_sign >= 0)
1566 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1567 /* leave negative numbers for sprintf to handle,
1568 to avoid handling tricky cases like (short int)(-32768) */
1569 #ifdef LINUX_COMPATIBLE
1570 } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
1571 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1573 } else if (alternate_form) {
1574 if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') )
1575 { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
1576 /* alternate form should have no effect for p conversion, but ... */
1577 #ifdef HPUX_COMPATIBLE
1578 else if (fmt_spec == 'p'
1579 /* HPUX 10: for an alternate form of p conversion,
1580 * a nonzero result is prefixed by 0x. */
1581 #ifndef HPUX_BUG_COMPATIBLE
1582 /* Actually it uses 0x prefix even for a zero value. */
1585 ) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; }
1588 zero_padding_insertion_ind = str_arg_l;
1589 if (!precision_specified) precision = 1; /* default precision is 1 */
1590 if (precision == 0 && arg_sign == 0
1591 #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1593 /* HPUX 10 man page claims: With conversion character p the result of
1594 * converting a zero value with a precision of zero is a null string.
1595 * Actually HP returns all zeroes, and Linux returns "(nil)". */
1598 /* converted to null string */
1599 /* When zero value is formatted with an explicit precision 0,
1600 the resulting formatted string is empty (d, i, u, o, x, X, p). */
1602 char f[5]; int f_l = 0;
1603 f[f_l++] = '%'; /* construct a simple format string for sprintf */
1604 if (!length_modifier) { }
1605 else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
1606 else f[f_l++] = length_modifier;
1607 f[f_l++] = fmt_spec; f[f_l++] = '\0';
1608 if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
1609 else if (fmt_spec == 'd') { /* signed */
1610 switch (length_modifier) {
1612 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
1613 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
1614 #ifdef SNPRINTF_LONGLONG_SUPPORT
1615 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
1618 } else { /* unsigned */
1619 switch (length_modifier) {
1621 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
1622 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
1623 #ifdef SNPRINTF_LONGLONG_SUPPORT
1624 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
1628 /* include the optional minus sign and possible "0x"
1629 in the region before the zero padding insertion point */
1630 if (zero_padding_insertion_ind < str_arg_l &&
1631 tmp[zero_padding_insertion_ind] == '-') {
1632 zero_padding_insertion_ind++;
1634 if (zero_padding_insertion_ind+1 < str_arg_l &&
1635 tmp[zero_padding_insertion_ind] == '0' &&
1636 (tmp[zero_padding_insertion_ind+1] == 'x' ||
1637 tmp[zero_padding_insertion_ind+1] == 'X') ) {
1638 zero_padding_insertion_ind += 2;
1641 { size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
1642 if (alternate_form && fmt_spec == 'o'
1643 #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
1646 #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
1648 /* unless zero is already the first character */
1649 && !(zero_padding_insertion_ind < str_arg_l
1650 && tmp[zero_padding_insertion_ind] == '0')
1652 ) { /* assure leading zero for alternate-form octal numbers */
1653 if (!precision_specified || precision < num_of_digits+1) {
1654 /* precision is increased to force the first character to be zero,
1655 except if a zero value is formatted with an explicit precision
1657 precision = num_of_digits+1; precision_specified = 1;
1660 /* zero padding to specified precision? */
1661 if (num_of_digits < precision)
1662 number_of_zeros_to_pad = precision - num_of_digits;
1664 /* zero padding to specified minimal field width? */
1665 if (!justify_left && zero_padding) {
1666 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1667 if (n > 0) number_of_zeros_to_pad += n;
1671 default: /* unrecognized conversion specifier, keep format string as-is*/
1672 zero_padding = 0; /* turn zero padding off for non-numeric convers. */
1673 #ifndef DIGITAL_UNIX_COMPATIBLE
1674 justify_left = 1; min_field_width = 0; /* reset flags */
1676 #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1677 /* keep the entire format string unchanged */
1678 str_arg = starting_p; str_arg_l = p - starting_p;
1679 /* well, not exactly so for Linux, which does something inbetween,
1680 * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
1682 /* discard the unrecognized conversion, just keep *
1683 * the unrecognized conversion character */
1684 str_arg = p; str_arg_l = 0;
1686 if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
1687 if not at end-of-string */
1690 if (*p) p++; /* step over the just processed conversion specifier */
1691 /* insert padding to the left as requested by min_field_width;
1692 this does not include the zero padding in case of numerical conversions*/
1693 if (!justify_left) { /* left padding with blank or zero */
1694 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1696 if (str_l < str_m) {
1697 size_t avail = str_m-str_l;
1698 fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
1703 /* zero padding as requested by the precision or by the minimal field width
1704 * for numeric conversions required? */
1705 if (number_of_zeros_to_pad <= 0) {
1706 /* will not copy first part of numeric right now, *
1707 * force it to be copied later in its entirety */
1708 zero_padding_insertion_ind = 0;
1710 /* insert first part of numerics (sign or '0x') before zero padding */
1711 int n = zero_padding_insertion_ind;
1713 if (str_l < str_m) {
1714 size_t avail = str_m-str_l;
1715 fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
1719 /* insert zero padding as requested by the precision or min field width */
1720 n = number_of_zeros_to_pad;
1722 if (str_l < str_m) {
1723 size_t avail = str_m-str_l;
1724 fast_memset(str+str_l, '0', (n>avail?avail:n));
1729 /* insert formatted string
1730 * (or as-is conversion specifier for unknown conversions) */
1731 { int n = str_arg_l - zero_padding_insertion_ind;
1733 if (str_l < str_m) {
1734 size_t avail = str_m-str_l;
1735 fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
1741 /* insert right padding */
1742 if (justify_left) { /* right blank padding to the field width */
1743 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1745 if (str_l < str_m) {
1746 size_t avail = str_m-str_l;
1747 fast_memset(str+str_l, ' ', (n>avail?avail:n));
1754 #if defined(NEED_SNPRINTF_ONLY)
1757 if (str_m > 0) { /* make sure the string is null-terminated
1758 even at the expense of overwriting the last character
1759 (shouldn't happen, but just in case) */
1760 str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
1762 /* Return the number of characters formatted (excluding trailing null
1763 * character), that is, the number of characters that would have been
1764 * written to the buffer if it were large enough.
1766 * The value of str_l should be returned, but str_l is of unsigned type
1767 * size_t, and snprintf is int, possibly leading to an undetected
1768 * integer overflow, resulting in a negative return value, which is illegal.
1769 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1770 * Should errno be set to EOVERFLOW and EOF returned in this case???
1775 #endif /* __OS2__ */