1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.41 2006/08/18 16:03:17 david__schmidt Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/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 1.41 2006/08/18 16:03:17 david__schmidt
40 * Tweak for OS/2 build happiness.
42 * Revision 1.40 2006/08/17 17:15:10 fabiankeil
43 * - Back to timegm() using GnuPG's replacement if necessary.
44 * Using mktime() and localtime() could add a on hour offset if
45 * the randomize factor was big enough to lead to a summer/wintertime
48 * - Removed now-useless Privoxy 3.0.3 compatibility glue.
50 * - Moved randomization code into pick_from_range().
52 * - Changed parse_header_time definition.
53 * time_t isn't guaranteed to be signed and
54 * if it isn't, -1 isn't available as error code.
55 * Changed some variable types in client_if_modified_since()
56 * because of the same reason.
58 * Revision 1.39 2006/07/18 14:48:46 david__schmidt
59 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
60 * with what was really the latest development (the v_3_0_branch branch)
62 * Revision 1.37.2.4 2003/12/01 14:45:14 oes
63 * Fixed two more problems with wildcarding in simplematch()
65 * Revision 1.37.2.3 2003/11/20 11:39:24 oes
66 * Bugfix: The "?" wildcard for domain names had never been implemented. Ooops\!
68 * Revision 1.37.2.2 2002/11/12 14:28:18 oes
69 * Proper backtracking in simplematch; fixes bug #632888
71 * Revision 1.37.2.1 2002/09/25 12:58:51 oes
72 * Made strcmpic and strncmpic safe against NULL arguments
73 * (which are now treated as empty strings).
75 * Revision 1.37 2002/04/26 18:29:43 jongfoster
76 * Fixing this Visual C++ warning:
77 * miscutil.c(710) : warning C4090: '=' : different 'const' qualifiers
79 * Revision 1.36 2002/04/26 12:55:38 oes
80 * New function string_toupper
82 * Revision 1.35 2002/03/26 22:29:55 swa
83 * we have a new homepage!
85 * Revision 1.34 2002/03/24 13:25:43 swa
86 * name change related issues
88 * Revision 1.33 2002/03/07 03:46:53 oes
89 * Fixed compiler warnings etc
91 * Revision 1.32 2002/03/06 23:02:57 jongfoster
94 * Revision 1.31 2002/03/05 04:52:42 oes
95 * Deleted non-errlog debugging code
97 * Revision 1.30 2002/03/04 18:27:42 oes
98 * - Deleted deletePidFile
99 * - Made write_pid_file use the --pidfile option value
100 * (or no PID file, if the option was absent)
101 * - Played styleguide police
103 * Revision 1.29 2002/03/04 02:08:02 david__schmidt
104 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
106 * Revision 1.28 2002/03/03 09:18:03 joergs
107 * Made jumbjuster work on AmigaOS again.
109 * Revision 1.27 2002/01/21 00:52:32 jongfoster
110 * Adding string_join()
112 * Revision 1.26 2001/12/30 14:07:32 steudten
113 * - Add signal handling (unix)
114 * - Add SIGHUP handler (unix)
115 * - Add creation of pidfile (unix)
116 * - Add action 'top' in rc file (RH)
117 * - Add entry 'SIGNALS' to manpage
118 * - Add exit message to logfile (unix)
120 * Revision 1.25 2001/11/13 00:16:38 jongfoster
121 * Replacing references to malloc.h with the standard stdlib.h
122 * (See ANSI or K&R 2nd Ed)
124 * Revision 1.24 2001/11/05 21:41:43 steudten
125 * Add changes to be a real daemon just for unix os.
126 * (change cwd to /, detach from controlling tty, set
127 * process group and session leader to the own process.
129 * Add some fatal-error log message for failed malloc().
130 * Add '-d' if compiled with 'configure --with-debug' to
131 * enable debug output.
133 * Revision 1.23 2001/10/29 03:48:10 david__schmidt
134 * OS/2 native needed a snprintf() routine. Added one to miscutil, brackedted
135 * by and __OS2__ ifdef.
137 * Revision 1.22 2001/10/26 17:39:38 oes
138 * Moved ijb_isspace and ijb_tolower to project.h
140 * Revision 1.21 2001/10/23 21:27:50 jongfoster
141 * Standardising error codes in string_append
142 * make_path() no longer adds '\\' if the dir already ends in '\\' (this
143 * is just copying a UNIX-specific fix to the Windows-specific part)
145 * Revision 1.20 2001/10/22 15:33:56 david__schmidt
146 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
147 * filters.c. Added a FIXME in front of the offending code. I'll gladly
148 * put in a better/more robust fix for all parties if one is presented...
149 * It seems that just returning 200 instead of 404 would pretty much fix
150 * it for everyone, but I don't know all the history of the problem.
152 * Revision 1.19 2001/10/14 22:02:57 jongfoster
153 * New function string_append() which is like strsav(), but running
154 * out of memory isn't automatically FATAL.
156 * Revision 1.18 2001/09/20 13:33:43 steudten
158 * change long to int as return value in hash_string(). Remember the wraparound
159 * for int = long = sizeof(4) - thats maybe not what we want.
161 * Revision 1.17 2001/09/13 20:51:29 jongfoster
162 * Fixing potential problems with characters >=128 in simplematch()
163 * This was also a compiler warning.
165 * Revision 1.16 2001/09/10 10:56:59 oes
166 * Silenced compiler warnings
168 * Revision 1.15 2001/07/13 14:02:24 oes
169 * Removed vim-settings
171 * Revision 1.14 2001/06/29 21:45:41 oes
172 * Indentation, CRLF->LF, Tab-> Space
174 * Revision 1.13 2001/06/29 13:32:14 oes
175 * Removed logentry from cancelled commit
177 * Revision 1.12 2001/06/09 10:55:28 jongfoster
178 * Changing BUFSIZ ==> BUFFER_SIZE
180 * Revision 1.11 2001/06/07 23:09:19 jongfoster
181 * Cosmetic indentation changes.
183 * Revision 1.10 2001/06/07 14:51:38 joergs
184 * make_path() no longer adds '/' if the dir already ends in '/'.
186 * Revision 1.9 2001/06/07 14:43:17 swa
187 * slight mistake in make_path, unix path style is /.
189 * Revision 1.8 2001/06/05 22:32:01 jongfoster
190 * New function make_path() to splice directory and file names together.
192 * Revision 1.7 2001/06/03 19:12:30 oes
193 * introduced bindup()
195 * Revision 1.6 2001/06/01 18:14:49 jongfoster
196 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
197 * in config.h if appropriate) rather than the NO_STRERR macro.
199 * Revision 1.5 2001/06/01 10:31:51 oes
200 * Added character class matching to trivimatch; renamed to simplematch
202 * Revision 1.4 2001/05/31 17:32:31 oes
204 * - Enhanced domain part globbing with infix and prefix asterisk
205 * matching and optional unanchored operation
207 * Revision 1.3 2001/05/29 23:10:09 oes
210 * - Introduced chomp()
211 * - Moved strsav() from showargs to miscutil
213 * Revision 1.2 2001/05/29 09:50:24 jongfoster
214 * Unified blocklist/imagelist/permissionslist.
215 * File format is still under discussion, but the internal changes
218 * Also modified interceptor behaviour:
219 * - We now intercept all URLs beginning with one of the following
220 * prefixes (and *only* these prefixes):
222 * * http://ijbswa.sf.net/config/
223 * * http://ijbswa.sourceforge.net/config/
224 * - New interceptors "home page" - go to http://i.j.b/ to see it.
225 * - Internal changes so that intercepted and fast redirect pages
226 * are not replaced with an image.
227 * - Interceptors now have the option to send a binary page direct
228 * to the client. (i.e. ijb-send-banner uses this)
229 * - Implemented show-url-info interceptor. (Which is why I needed
230 * the above interceptors changes - a typical URL is
231 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
232 * The previous mechanism would not have intercepted that, and
233 * if it had been intercepted then it then it would have replaced
236 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
237 * Initial import of version 2.9.3 source tree
240 *********************************************************************/
246 #include <sys/types.h>
248 #if !defined(_WIN32) && !defined(__OS2__)
250 #endif /* #if !defined(_WIN32) && !defined(__OS2__) */
257 #endif /* #ifndef HAVE_TIMEGM */
260 #include "miscutil.h"
264 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
266 /*********************************************************************
270 * Description : Malloc some memory and set it to '\0'.
271 * The way calloc() ought to be -acjc
274 * 1 : size = Size of memory chunk to return.
276 * Returns : Pointer to newly malloc'd memory chunk.
278 *********************************************************************/
279 void *zalloc(size_t size)
283 if ((ret = (void *)malloc(size)) != NULL)
285 memset(ret, 0, size);
294 /*********************************************************************
296 * Function : write_pid_file
298 * Description : Writes a pid file with the pid of the main process
304 *********************************************************************/
305 void write_pid_file(void)
310 * If no --pidfile option was given,
311 * we can live without one.
313 if (pidfile == NULL) return;
315 if ((fp = fopen(pidfile, "w")) == NULL)
317 log_error(LOG_LEVEL_INFO, "can't open pidfile '%s': %E", pidfile);
321 fprintf(fp, "%u\n", (unsigned int) getpid());
327 #endif /* def unix */
330 /*********************************************************************
332 * Function : hash_string
334 * Description : Take a string and compute a (hopefuly) unique numeric
335 * integer value. This has several uses, but being able
336 * to "switch" a string the one of my favorites.
339 * 1 : s : string to be hashed.
341 * Returns : an unsigned long variable with the hashed value.
343 *********************************************************************/
344 unsigned int hash_string( const char* s )
359 /*********************************************************************
363 * Description : For some reason (which is beyond me), gcc and WIN32
364 * don't like strdup. When a "free" is executed on a
365 * strdup'd ptr, it can at times freez up! So I just
366 * replaced it and problem was solved.
369 * 1 : s = string to duplicate
371 * Returns : Pointer to newly malloc'ed copy of the string.
373 *********************************************************************/
374 char *strdup( const char *s )
376 char * result = (char *)malloc( strlen(s)+1 );
386 #endif /* def __MINGW32__ */
390 /*********************************************************************
392 * Function : safe_strerror
394 * Description : Variant of the library routine strerror() which will
395 * work on systems without the library routine, and
396 * which should never return NULL.
399 * 1 : err = the `errno' of the last operation.
401 * Returns : An "English" string of the last `errno'. Allocated
402 * with strdup(), so caller frees. May be NULL if the
403 * system is out of memory.
405 *********************************************************************/
406 char *safe_strerror(int err)
409 char buf[BUFFER_SIZE];
414 #endif /* HAVE_STRERROR */
418 sprintf(buf, "(errno = %d)", err);
427 /*********************************************************************
429 * Function : strcmpic
431 * Description : Case insensitive string comparison
434 * 1 : s1 = string 1 to compare
435 * 2 : s2 = string 2 to compare
437 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
439 *********************************************************************/
440 int strcmpic(const char *s1, const char *s2)
447 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
453 return(ijb_tolower(*s1) - ijb_tolower(*s2));
458 /*********************************************************************
460 * Function : strncmpic
462 * Description : Case insensitive string comparison (upto n characters)
465 * 1 : s1 = string 1 to compare
466 * 2 : s2 = string 2 to compare
467 * 3 : n = maximum characters to compare
469 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
471 *********************************************************************/
472 int strncmpic(const char *s1, const char *s2, size_t n)
474 if (n <= 0) return(0);
480 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
489 return(ijb_tolower(*s1) - ijb_tolower(*s2));
494 /*********************************************************************
498 * Description : In-situ-eliminate all leading and trailing whitespace
502 * 1 : s : string to be chomped.
504 * Returns : chomped string
506 *********************************************************************/
507 char *chomp(char *string)
512 * strip trailing whitespace
514 p = string + strlen(string);
515 while (p > string && ijb_isspace(*(p-1)))
522 * find end of leading whitespace
525 while (*q && ijb_isspace(*q))
531 * if there was any, move the rest forwards
546 /*********************************************************************
550 * Description : Reallocate "old" and append text to it. This makes
551 * it easier to append to malloc'd strings.
552 * Running out of memory is a FATAL error.
555 * 1 : old = Old text that is to be extended. Will be
556 * free()d by this routine. May be NULL.
557 * 2 : text_to_append = Text to be appended to old.
560 * Returns : Pointer to newly malloc'ed appended string.
561 * If there is no text to append, return old. Caller
564 *********************************************************************/
565 char *strsav(char *old, const char *text_to_append)
567 size_t old_len, new_len = 0;
570 if ((text_to_append == NULL) || (*text_to_append == '\0'))
577 if ((p = strdup(text_to_append)) == NULL)
579 log_error(LOG_LEVEL_FATAL, "strdup() failed!");
580 /* Never get here - LOG_LEVEL_FATAL causes program exit */
585 old_len = strlen(old);
586 new_len = old_len + strlen(text_to_append) + 1;
588 if ((p = realloc(old, new_len)) == NULL)
590 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
591 /* Never get here - LOG_LEVEL_FATAL causes program exit */
594 strcpy(p + old_len, text_to_append);
599 /*********************************************************************
601 * Function : string_append
603 * Description : Reallocate target_string and append text to it.
604 * This makes it easier to append to malloc'd strings.
605 * This is similar to the (removed) strsav(), but
606 * running out of memory isn't catastrophic.
610 * The following style provides sufficient error
611 * checking for this routine, with minimal clutter
612 * in the source code. It is recommended if you
613 * have many calls to this function:
615 * char * s = strdup(...); // don't check for error
616 * string_append(&s, ...); // don't check for error
617 * string_append(&s, ...); // don't check for error
618 * string_append(&s, ...); // don't check for error
619 * if (NULL == s) { ... handle error ... }
623 * char * s = strdup(...); // don't check for error
624 * string_append(&s, ...); // don't check for error
625 * string_append(&s, ...); // don't check for error
626 * if (string_append(&s, ...)) {... handle error ...}
629 * 1 : target_string = Pointer to old text that is to be
630 * extended. *target_string will be free()d by this
631 * routine. target_string must be non-NULL.
632 * If *target_string is NULL, this routine will
633 * do nothing and return with an error - this allows
634 * you to make many calls to this routine and only
635 * check for errors after the last one.
636 * 2 : text_to_append = Text to be appended to old.
639 * Returns : JB_ERR_OK on success, and sets *target_string
640 * to newly malloc'ed appended string. Caller
641 * must free(*target_string).
642 * JB_ERR_MEMORY on out-of-memory. (And free()s
643 * *target_string and sets it to NULL).
644 * JB_ERR_MEMORY if *target_string is NULL.
646 *********************************************************************/
647 jb_err string_append(char **target_string, const char *text_to_append)
652 assert(target_string);
653 assert(text_to_append);
655 if (*target_string == NULL)
657 return JB_ERR_MEMORY;
660 if (*text_to_append == '\0')
665 old_len = strlen(*target_string);
667 if (NULL == (new_string = realloc(*target_string,
668 strlen(text_to_append) + old_len + 1)))
670 free(*target_string);
672 *target_string = NULL;
673 return JB_ERR_MEMORY;
676 strcpy(new_string + old_len, text_to_append);
678 *target_string = new_string;
683 /*********************************************************************
685 * Function : string_join
687 * Description : Join two strings together. Frees BOTH the original
688 * strings. If either or both input strings are NULL,
689 * fails as if it had run out of memory.
691 * For comparison, string_append requires that the
692 * second string is non-NULL, and doesn't free it.
694 * Rationale: Too often, we want to do
695 * string_append(s, html_encode(s2)). That assert()s
696 * if s2 is NULL or if html_encode() runs out of memory.
697 * It also leaks memory. Proper checking is cumbersome.
698 * The solution: string_join(s, html_encode(s2)) is safe,
699 * and will free the memory allocated by html_encode().
702 * 1 : target_string = Pointer to old text that is to be
703 * extended. *target_string will be free()d by this
704 * routine. target_string must be non-NULL.
705 * 2 : text_to_append = Text to be appended to old.
707 * Returns : JB_ERR_OK on success, and sets *target_string
708 * to newly malloc'ed appended string. Caller
709 * must free(*target_string).
710 * JB_ERR_MEMORY on out-of-memory, or if
711 * *target_string or text_to_append is NULL. (In
712 * this case, frees *target_string and text_to_append,
713 * sets *target_string to NULL).
715 *********************************************************************/
716 jb_err string_join(char **target_string, char *text_to_append)
720 assert(target_string);
722 if (text_to_append == NULL)
724 freez(*target_string);
725 return JB_ERR_MEMORY;
728 err = string_append(target_string, text_to_append);
730 free(text_to_append);
736 /*********************************************************************
738 * Function : string_toupper
740 * Description : Produce a copy of string with all convertible
741 * characters converted to uppercase.
744 * 1 : string = string to convert
746 * Returns : Uppercase copy of string if possible,
747 * NULL on out-of-memory or if string was NULL.
749 *********************************************************************/
750 char *string_toupper(const char *string)
755 if (!string || ((result = (char *) zalloc(strlen(string) + 1)) == NULL))
765 *p++ = toupper(*q++);
773 /*********************************************************************
775 * Function : simplematch
777 * Description : String matching, with a (greedy) '*' wildcard that
778 * stands for zero or more arbitrary characters and
779 * character classes in [], which take both enumerations
783 * 1 : pattern = pattern for matching
784 * 2 : text = text to be matched
786 * Returns : 0 if match, else nonzero
788 *********************************************************************/
789 int simplematch(char *pattern, char *text)
791 unsigned char *pat = (unsigned char *) pattern;
792 unsigned char *txt = (unsigned char *) text;
793 unsigned char *fallback = pat;
796 unsigned char lastchar = 'a';
798 unsigned char charmap[32];
803 /* EOF pattern but !EOF text? */
816 /* '*' in the pattern? */
820 /* The pattern ends afterwards? Speed up the return. */
826 /* Else, set wildcard mode and remember position after '*' */
831 /* Character range specification? */
834 memset(charmap, '\0', sizeof(charmap));
836 while (*++pat != ']')
842 else if (*pat == '-')
844 if ((*++pat == ']') || *pat == '\0')
848 for(i = lastchar; i <= *pat; i++)
850 charmap[i / 8] |= (1 << (i % 8));
855 charmap[*pat / 8] |= (1 << (*pat % 8));
859 } /* -END- if Character range specification */
863 * Char match, or char range match?
867 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
877 * No match && no wildcard: No luck
881 else if (pat != fallback)
884 * Increment text pointer if in char range matching
891 * Wildcard mode && nonmatch beyond fallback: Rewind pattern
895 * Restart matching from current text pointer
902 /* Cut off extra '*'s */
903 if(*pat == '*') pat++;
905 /* If this is the pattern's end, fine! */
911 /*********************************************************************
915 * Description : Duplicate the first n characters of a string that may
916 * contain '\0' characters.
919 * 1 : string = string to be duplicated
920 * 2 : len = number of bytes to duplicate
922 * Returns : pointer to copy, or NULL if failiure
924 *********************************************************************/
925 char *bindup(const char *string, size_t len)
929 if (NULL == (duplicate = (char *)malloc(len)))
935 memcpy(duplicate, string, len);
943 /*********************************************************************
945 * Function : make_path
947 * Description : Takes a directory name and a file name, returns
948 * the complete path. Handles windows/unix differences.
949 * If the file name is already an absolute path, or if
950 * the directory name is NULL or empty, it returns
954 * 1 : dir: Name of directory or NULL for none.
955 * 2 : file: Name of file. Should not be NULL or empty.
957 * Returns : "dir/file" (Or on windows, "dir\file").
958 * It allocates the string on the heap. Caller frees.
959 * Returns NULL in error (i.e. NULL file or out of
962 *********************************************************************/
963 char * make_path(const char * dir, const char * file)
974 strncpy(path,dir+2,512);
978 strncpy(path,dir+1,512);
983 strncpy(path,dir,512);
989 if(AddPart(path,file,512))
995 #else /* ndef AMIGA */
997 if ((file == NULL) || (*file == '\0'))
999 return NULL; /* Error */
1002 if ((dir == NULL) || (*dir == '\0') /* No directory specified */
1003 #if defined(_WIN32) || defined(__OS2__)
1004 || (*file == '\\') || (file[1] == ':') /* Absolute path (DOS) */
1005 #else /* ifndef _WIN32 || __OS2__ */
1006 || (*file == '/') /* Absolute path (U*ix) */
1007 #endif /* ifndef _WIN32 || __OS2__ */
1010 return strdup(file);
1017 if ( *dir != '/' && basedir && *basedir )
1019 path = malloc( strlen( basedir ) + strlen(dir) + strlen(file) + 3);
1020 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1021 strcpy(path, basedir);
1027 path = malloc(strlen(dir) + strlen(file) + 2);
1028 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1033 path = malloc(strlen(dir) + strlen(file) + 2);
1034 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1037 #endif /* defined unix */
1039 #if defined(_WIN32) || defined(__OS2__)
1040 if(path[strlen(path)-1] != '\\')
1044 #else /* ifndef _WIN32 || __OS2__ */
1045 if(path[strlen(path)-1] != '/')
1049 #endif /* ifndef _WIN32 || __OS2__ */
1054 #endif /* ndef AMIGA */
1058 /*********************************************************************
1060 * Function : pick_from_range
1062 * Description : Pick a positive number out of a given range.
1063 * Should only be used if randomness would be nice,
1064 * but isn't really necessary.
1067 * 1 : range: Highest possible number to pick.
1069 * Returns : Picked number.
1071 *********************************************************************/
1073 long int pick_from_range(long int range)
1077 unsigned int weak_seed;
1079 weak_seed = (unsigned int)((unsigned int)time(NULL) | (unsigned int)range);
1082 * Some rand implementations aren't that random and return mostly
1083 * lower numbers. Low entropy doesn't matter for the header times,
1084 * but higher "random" factors are prefered.
1086 number = (rand() * 12345) % (long int)(range + 1);
1087 /* Overflows don't matter either, positive numbers do. */
1093 number = random() % range + 1;
1094 #endif /* (ifndef HAVE_RANDOM) */
1100 /*********************************************************************
1104 * Description : libc replacement function for the inverse of gmtime()
1105 * Copyright (C) 2004 Free Software Foundation, Inc.
1106 * Code copied from GnuPG with minor style changes.
1109 * 1 : tm: Broken-down time struct.
1111 * Returns : tm converted into time_t seconds.
1113 *********************************************************************/
1115 time_t timegm(struct tm *tm)
1128 old_zone=malloc(3+strlen(zone)+1);
1131 strcpy(old_zone,"TZ=");
1132 strcat(old_zone,zone);
1138 #ifdef HAVE_UNSETENV
1147 #endif /* (ifndef HAVE_TIMEGM) */
1151 * What follows is a portable snprintf routine, written by Mark Martinec.
1152 * See: http://www.ijs.si/software/snprintf/
1153 * Anyone who needs it can add a define for themselves... so far, only
1154 * OS/2 (native) lacks snprintf.
1157 - a portable implementation of snprintf,
1158 including vsnprintf.c, asnprintf, vasnprintf, asprintf, vasprintf
1160 snprintf is a routine to convert numeric and string arguments to
1161 formatted strings. It is similar to sprintf(3) provided in a system's
1162 C library, yet it requires an additional argument - the buffer size -
1163 and it guarantees never to store anything beyond the given buffer,
1164 regardless of the format or arguments to be formatted. Some newer
1165 operating systems do provide snprintf in their C library, but many do
1166 not or do provide an inadequate (slow or idiosyncratic) version, which
1167 calls for a portable implementation of this routine.
1171 Mark Martinec <mark.martinec@ijs.si>, April 1999, June 2000
1172 Copyright © 1999, Mark Martinec
1178 #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
1179 #define PORTABLE_SNPRINTF_VERSION_MINOR 2
1181 #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
1182 # if defined(NEED_SNPRINTF_ONLY)
1183 # undef NEED_SNPRINTF_ONLY
1185 # if !defined(PREFER_PORTABLE_SNPRINTF)
1186 # define PREFER_PORTABLE_SNPRINTF
1190 #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
1191 #define SOLARIS_COMPATIBLE
1194 #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1195 #define HPUX_COMPATIBLE
1198 #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
1199 #define DIGITAL_UNIX_COMPATIBLE
1202 #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
1203 #define PERL_COMPATIBLE
1206 #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
1207 #define LINUX_COMPATIBLE
1210 #include <sys/types.h>
1221 #define isdigit(c) ((c) >= '0' && (c) <= '9')
1223 /* For copying strings longer or equal to 'breakeven_point'
1224 * it is more efficient to call memcpy() than to do it inline.
1225 * The value depends mostly on the processor architecture,
1226 * but also on the compiler and its optimization capabilities.
1227 * The value is not critical, some small value greater than zero
1228 * will be just fine if you don't care to squeeze every drop
1229 * of performance out of the code.
1231 * Small values favor memcpy, large values favor inline code.
1233 #if defined(__alpha__) || defined(__alpha)
1234 # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
1236 #if defined(__i386__) || defined(__i386)
1237 # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
1240 # define breakeven_point 10 /* HP-PA - gcc */
1242 #if defined(__sparc__) || defined(__sparc)
1243 # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
1246 /* some other values of possible interest: */
1247 /* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
1248 /* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
1250 #ifndef breakeven_point
1251 # define breakeven_point 6 /* some reasonable one-size-fits-all value */
1254 #define fast_memcpy(d,s,n) \
1255 { register size_t nn = (size_t)(n); \
1256 if (nn >= breakeven_point) memcpy((d), (s), nn); \
1257 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1258 register char *dd; register const char *ss; \
1259 for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
1261 #define fast_memset(d,c,n) \
1262 { register size_t nn = (size_t)(n); \
1263 if (nn >= breakeven_point) memset((d), (int)(c), nn); \
1264 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1265 register char *dd; register const int cc=(int)(c); \
1266 for (dd=(d); nn>0; nn--) *dd++ = cc; } }
1270 #if defined(NEED_ASPRINTF)
1271 int asprintf (char **ptr, const char *fmt, /*args*/ ...);
1273 #if defined(NEED_VASPRINTF)
1274 int vasprintf (char **ptr, const char *fmt, va_list ap);
1276 #if defined(NEED_ASNPRINTF)
1277 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
1279 #if defined(NEED_VASNPRINTF)
1280 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
1283 #if defined(HAVE_SNPRINTF)
1284 /* declare our portable snprintf routine under name portable_snprintf */
1285 /* declare our portable vsnprintf routine under name portable_vsnprintf */
1287 /* declare our portable routines under names snprintf and vsnprintf */
1288 #define portable_snprintf snprintf
1289 #if !defined(NEED_SNPRINTF_ONLY)
1290 #define portable_vsnprintf vsnprintf
1294 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1295 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
1296 #if !defined(NEED_SNPRINTF_ONLY)
1297 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
1303 static char credits[] = "\n\
1304 @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
1305 @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
1306 @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
1308 #if defined(NEED_ASPRINTF)
1309 int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
1315 va_start(ap, fmt); /* measure the required size */
1316 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1318 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1319 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1320 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1324 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1326 assert(str_l2 == str_l);
1332 #if defined(NEED_VASPRINTF)
1333 int vasprintf(char **ptr, const char *fmt, va_list ap) {
1339 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1340 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1343 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1344 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1345 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1347 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1348 assert(str_l2 == str_l);
1354 #if defined(NEED_ASNPRINTF)
1355 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
1360 va_start(ap, fmt); /* measure the required size */
1361 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1363 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1364 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1365 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1366 if (str_m == 0) { /* not interested in resulting string, just return size */
1368 *ptr = (char *) malloc(str_m);
1369 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1373 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1375 assert(str_l2 == str_l);
1382 #if defined(NEED_VASNPRINTF)
1383 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
1388 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1389 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1392 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1393 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1394 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1395 if (str_m == 0) { /* not interested in resulting string, just return size */
1397 *ptr = (char *) malloc(str_m);
1398 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1400 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1401 assert(str_l2 == str_l);
1409 * If the system does have snprintf and the portable routine is not
1410 * specifically required, this module produces no code for snprintf/vsnprintf.
1412 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1414 #if !defined(NEED_SNPRINTF_ONLY)
1415 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1420 str_l = portable_vsnprintf(str, str_m, fmt, ap);
1426 #if defined(NEED_SNPRINTF_ONLY)
1427 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1429 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
1432 #if defined(NEED_SNPRINTF_ONLY)
1436 const char *p = fmt;
1438 /* In contrast with POSIX, the ISO C99 now says
1439 * that str can be NULL and str_m can be 0.
1440 * This is more useful than the old: if (str_m < 1) return -1; */
1442 #if defined(NEED_SNPRINTF_ONLY)
1448 /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
1449 /* but the following code achieves better performance for cases
1450 * where format string is long and contains few conversions */
1451 const char *q = strchr(p+1,'%');
1452 size_t n = !q ? strlen(p) : (q-p);
1453 if (str_l < str_m) {
1454 size_t avail = str_m-str_l;
1455 fast_memcpy(str+str_l, p, (n>avail?avail:n));
1459 const char *starting_p;
1460 size_t min_field_width = 0, precision = 0;
1461 int zero_padding = 0, precision_specified = 0, justify_left = 0;
1462 int alternate_form = 0, force_sign = 0;
1463 int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
1464 the ' ' flag should be ignored. */
1465 char length_modifier = '\0'; /* allowed values: \0, h, l, L */
1466 char tmp[32];/* temporary buffer for simple numeric->string conversion */
1468 const char *str_arg; /* string address in case of string argument */
1469 size_t str_arg_l; /* natural field width of arg without padding
1471 unsigned char uchar_arg;
1472 /* unsigned char argument value - only defined for c conversion.
1473 N.B. standard explicitly states the char argument for
1474 the c conversion is unsigned */
1476 size_t number_of_zeros_to_pad = 0;
1477 /* number of zeros to be inserted for numeric conversions
1478 as required by the precision or minimal field width */
1480 size_t zero_padding_insertion_ind = 0;
1481 /* index into tmp where zero padding is to be inserted */
1483 char fmt_spec = '\0';
1484 /* current conversion specifier character */
1486 str_arg = credits;/* just to make compiler happy (defined but not used)*/
1488 starting_p = p; p++; /* skip '%' */
1490 while (*p == '0' || *p == '-' || *p == '+' ||
1491 *p == ' ' || *p == '#' || *p == '\'') {
1493 case '0': zero_padding = 1; break;
1494 case '-': justify_left = 1; break;
1495 case '+': force_sign = 1; space_for_positive = 0; break;
1496 case ' ': force_sign = 1;
1497 /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
1498 #ifdef PERL_COMPATIBLE
1499 /* ... but in Perl the last of ' ' and '+' applies */
1500 space_for_positive = 1;
1503 case '#': alternate_form = 1; break;
1508 /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
1510 /* parse field width */
1513 p++; j = va_arg(ap, int);
1514 if (j >= 0) min_field_width = j;
1515 else { min_field_width = -j; justify_left = 1; }
1516 } else if (isdigit((int)(*p))) {
1517 /* size_t could be wider than unsigned int;
1518 make sure we treat argument like common implementations do */
1519 unsigned int uj = *p++ - '0';
1520 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1521 min_field_width = uj;
1523 /* parse precision */
1525 p++; precision_specified = 1;
1527 int j = va_arg(ap, int);
1529 if (j >= 0) precision = j;
1531 precision_specified = 0; precision = 0;
1533 * Solaris 2.6 man page claims that in this case the precision
1534 * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
1535 * claim that this case should be treated as unspecified precision,
1536 * which is what we do here.
1539 } else if (isdigit((int)(*p))) {
1540 /* size_t could be wider than unsigned int;
1541 make sure we treat argument like common implementations do */
1542 unsigned int uj = *p++ - '0';
1543 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1547 /* parse 'h', 'l' and 'll' length modifiers */
1548 if (*p == 'h' || *p == 'l') {
1549 length_modifier = *p; p++;
1550 if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
1551 #ifdef SNPRINTF_LONGLONG_SUPPORT
1552 length_modifier = '2'; /* double l encoded as '2' */
1554 length_modifier = 'l'; /* treat it as a single 'l' */
1560 /* common synonyms: */
1562 case 'i': fmt_spec = 'd'; break;
1563 case 'D': fmt_spec = 'd'; length_modifier = 'l'; break;
1564 case 'U': fmt_spec = 'u'; length_modifier = 'l'; break;
1565 case 'O': fmt_spec = 'o'; length_modifier = 'l'; break;
1568 /* get parameter value, do initial processing */
1570 case '%': /* % behaves similar to 's' regarding flags and field widths */
1571 case 'c': /* c behaves similar to 's' regarding flags and field widths */
1573 length_modifier = '\0'; /* wint_t and wchar_t not supported */
1574 /* the result of zero padding flag with non-numeric conversion specifier*/
1575 /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
1576 /* Digital Unix and Linux does not. */
1577 #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1578 zero_padding = 0; /* turn zero padding off for string conversions */
1585 int j = va_arg(ap, int);
1586 uchar_arg = (unsigned char) j; /* standard demands unsigned char */
1587 str_arg = (const char *) &uchar_arg;
1591 str_arg = va_arg(ap, const char *);
1592 if (!str_arg) str_arg_l = 0;
1593 /* make sure not to address string beyond the specified precision !!! */
1594 else if (!precision_specified) str_arg_l = strlen(str_arg);
1595 /* truncate string if necessary as requested by precision */
1596 else if (precision == 0) str_arg_l = 0;
1598 /* memchr on HP does not like n > 2^31 !!! */
1599 const char *q = memchr(str_arg, '\0',
1600 precision <= 0x7fffffff ? precision : 0x7fffffff);
1601 str_arg_l = !q ? precision : (q-str_arg);
1607 case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': {
1608 /* NOTE: the u, o, x, X and p conversion specifiers imply
1609 the value is unsigned; d implies a signed value */
1612 /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
1613 +1 if greater than zero (or nonzero for unsigned arguments),
1614 -1 if negative (unsigned argument is never negative) */
1616 int int_arg = 0; unsigned int uint_arg = 0;
1617 /* only defined for length modifier h, or for no length modifiers */
1619 long int long_arg = 0; unsigned long int ulong_arg = 0;
1620 /* only defined for length modifier l */
1622 void *ptr_arg = NULL;
1623 /* pointer argument value -only defined for p conversion */
1625 #ifdef SNPRINTF_LONGLONG_SUPPORT
1626 long long int long_long_arg = 0;
1627 unsigned long long int ulong_long_arg = 0;
1628 /* only defined for length modifier ll */
1630 if (fmt_spec == 'p') {
1631 /* HPUX 10: An l, h, ll or L before any other conversion character
1632 * (other than d, i, u, o, x, or X) is ignored.
1634 * not specified, but seems to behave as HPUX does.
1635 * Solaris: If an h, l, or L appears before any other conversion
1636 * specifier (other than d, i, u, o, x, or X), the behavior
1637 * is undefined. (Actually %hp converts only 16-bits of address
1638 * and %llp treats address as 64-bit data which is incompatible
1639 * with (void *) argument on a 32-bit system).
1641 #ifdef SOLARIS_COMPATIBLE
1642 # ifdef SOLARIS_BUG_COMPATIBLE
1643 /* keep length modifiers even if it represents 'll' */
1645 if (length_modifier == '2') length_modifier = '\0';
1648 length_modifier = '\0';
1650 ptr_arg = va_arg(ap, void *);
1651 if (ptr_arg != NULL) arg_sign = 1;
1652 } else if (fmt_spec == 'd') { /* signed */
1653 switch (length_modifier) {
1656 /* It is non-portable to specify a second argument of char or short
1657 * to va_arg, because arguments seen by the called function
1658 * are not char or short. C converts char and short arguments
1659 * to int before passing them to a function.
1661 int_arg = va_arg(ap, int);
1662 if (int_arg > 0) arg_sign = 1;
1663 else if (int_arg < 0) arg_sign = -1;
1666 long_arg = va_arg(ap, long int);
1667 if (long_arg > 0) arg_sign = 1;
1668 else if (long_arg < 0) arg_sign = -1;
1670 #ifdef SNPRINTF_LONGLONG_SUPPORT
1672 long_long_arg = va_arg(ap, long long int);
1673 if (long_long_arg > 0) arg_sign = 1;
1674 else if (long_long_arg < 0) arg_sign = -1;
1678 } else { /* unsigned */
1679 switch (length_modifier) {
1682 uint_arg = va_arg(ap, unsigned int);
1683 if (uint_arg) arg_sign = 1;
1686 ulong_arg = va_arg(ap, unsigned long int);
1687 if (ulong_arg) arg_sign = 1;
1689 #ifdef SNPRINTF_LONGLONG_SUPPORT
1691 ulong_long_arg = va_arg(ap, unsigned long long int);
1692 if (ulong_long_arg) arg_sign = 1;
1697 str_arg = tmp; str_arg_l = 0;
1699 * For d, i, u, o, x, and X conversions, if precision is specified,
1700 * the '0' flag should be ignored. This is so with Solaris 2.6,
1701 * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
1703 #ifndef PERL_COMPATIBLE
1704 if (precision_specified) zero_padding = 0;
1706 if (fmt_spec == 'd') {
1707 if (force_sign && arg_sign >= 0)
1708 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1709 /* leave negative numbers for sprintf to handle,
1710 to avoid handling tricky cases like (short int)(-32768) */
1711 #ifdef LINUX_COMPATIBLE
1712 } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
1713 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1715 } else if (alternate_form) {
1716 if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') )
1717 { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
1718 /* alternate form should have no effect for p conversion, but ... */
1719 #ifdef HPUX_COMPATIBLE
1720 else if (fmt_spec == 'p'
1721 /* HPUX 10: for an alternate form of p conversion,
1722 * a nonzero result is prefixed by 0x. */
1723 #ifndef HPUX_BUG_COMPATIBLE
1724 /* Actually it uses 0x prefix even for a zero value. */
1727 ) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; }
1730 zero_padding_insertion_ind = str_arg_l;
1731 if (!precision_specified) precision = 1; /* default precision is 1 */
1732 if (precision == 0 && arg_sign == 0
1733 #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1735 /* HPUX 10 man page claims: With conversion character p the result of
1736 * converting a zero value with a precision of zero is a null string.
1737 * Actually HP returns all zeroes, and Linux returns "(nil)". */
1740 /* converted to null string */
1741 /* When zero value is formatted with an explicit precision 0,
1742 the resulting formatted string is empty (d, i, u, o, x, X, p). */
1744 char f[5]; int f_l = 0;
1745 f[f_l++] = '%'; /* construct a simple format string for sprintf */
1746 if (!length_modifier) { }
1747 else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
1748 else f[f_l++] = length_modifier;
1749 f[f_l++] = fmt_spec; f[f_l++] = '\0';
1750 if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
1751 else if (fmt_spec == 'd') { /* signed */
1752 switch (length_modifier) {
1754 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
1755 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
1756 #ifdef SNPRINTF_LONGLONG_SUPPORT
1757 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
1760 } else { /* unsigned */
1761 switch (length_modifier) {
1763 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
1764 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
1765 #ifdef SNPRINTF_LONGLONG_SUPPORT
1766 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
1770 /* include the optional minus sign and possible "0x"
1771 in the region before the zero padding insertion point */
1772 if (zero_padding_insertion_ind < str_arg_l &&
1773 tmp[zero_padding_insertion_ind] == '-') {
1774 zero_padding_insertion_ind++;
1776 if (zero_padding_insertion_ind+1 < str_arg_l &&
1777 tmp[zero_padding_insertion_ind] == '0' &&
1778 (tmp[zero_padding_insertion_ind+1] == 'x' ||
1779 tmp[zero_padding_insertion_ind+1] == 'X') ) {
1780 zero_padding_insertion_ind += 2;
1783 { size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
1784 if (alternate_form && fmt_spec == 'o'
1785 #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
1788 #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
1790 /* unless zero is already the first character */
1791 && !(zero_padding_insertion_ind < str_arg_l
1792 && tmp[zero_padding_insertion_ind] == '0')
1794 ) { /* assure leading zero for alternate-form octal numbers */
1795 if (!precision_specified || precision < num_of_digits+1) {
1796 /* precision is increased to force the first character to be zero,
1797 except if a zero value is formatted with an explicit precision
1799 precision = num_of_digits+1; precision_specified = 1;
1802 /* zero padding to specified precision? */
1803 if (num_of_digits < precision)
1804 number_of_zeros_to_pad = precision - num_of_digits;
1806 /* zero padding to specified minimal field width? */
1807 if (!justify_left && zero_padding) {
1808 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1809 if (n > 0) number_of_zeros_to_pad += n;
1813 default: /* unrecognized conversion specifier, keep format string as-is*/
1814 zero_padding = 0; /* turn zero padding off for non-numeric convers. */
1815 #ifndef DIGITAL_UNIX_COMPATIBLE
1816 justify_left = 1; min_field_width = 0; /* reset flags */
1818 #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1819 /* keep the entire format string unchanged */
1820 str_arg = starting_p; str_arg_l = p - starting_p;
1821 /* well, not exactly so for Linux, which does something inbetween,
1822 * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
1824 /* discard the unrecognized conversion, just keep *
1825 * the unrecognized conversion character */
1826 str_arg = p; str_arg_l = 0;
1828 if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
1829 if not at end-of-string */
1832 if (*p) p++; /* step over the just processed conversion specifier */
1833 /* insert padding to the left as requested by min_field_width;
1834 this does not include the zero padding in case of numerical conversions*/
1835 if (!justify_left) { /* left padding with blank or zero */
1836 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1838 if (str_l < str_m) {
1839 size_t avail = str_m-str_l;
1840 fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
1845 /* zero padding as requested by the precision or by the minimal field width
1846 * for numeric conversions required? */
1847 if (number_of_zeros_to_pad <= 0) {
1848 /* will not copy first part of numeric right now, *
1849 * force it to be copied later in its entirety */
1850 zero_padding_insertion_ind = 0;
1852 /* insert first part of numerics (sign or '0x') before zero padding */
1853 int n = zero_padding_insertion_ind;
1855 if (str_l < str_m) {
1856 size_t avail = str_m-str_l;
1857 fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
1861 /* insert zero padding as requested by the precision or min field width */
1862 n = number_of_zeros_to_pad;
1864 if (str_l < str_m) {
1865 size_t avail = str_m-str_l;
1866 fast_memset(str+str_l, '0', (n>avail?avail:n));
1871 /* insert formatted string
1872 * (or as-is conversion specifier for unknown conversions) */
1873 { int n = str_arg_l - zero_padding_insertion_ind;
1875 if (str_l < str_m) {
1876 size_t avail = str_m-str_l;
1877 fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
1883 /* insert right padding */
1884 if (justify_left) { /* right blank padding to the field width */
1885 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1887 if (str_l < str_m) {
1888 size_t avail = str_m-str_l;
1889 fast_memset(str+str_l, ' ', (n>avail?avail:n));
1896 #if defined(NEED_SNPRINTF_ONLY)
1899 if (str_m > 0) { /* make sure the string is null-terminated
1900 even at the expense of overwriting the last character
1901 (shouldn't happen, but just in case) */
1902 str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
1904 /* Return the number of characters formatted (excluding trailing null
1905 * character), that is, the number of characters that would have been
1906 * written to the buffer if it were large enough.
1908 * The value of str_l should be returned, but str_l is of unsigned type
1909 * size_t, and snprintf is int, possibly leading to an undetected
1910 * integer overflow, resulting in a negative return value, which is illegal.
1911 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1912 * Should errno be set to EOVERFLOW and EOF returned in this case???
1917 #endif /* __OS2__ */