1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.40 2006/08/17 17:15:10 fabiankeil 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 1.40 2006/08/17 17:15:10 fabiankeil
40 * - Back to timegm() using GnuPG's replacement if necessary.
41 * Using mktime() and localtime() could add a on hour offset if
42 * the randomize factor was big enough to lead to a summer/wintertime
45 * - Removed now-useless Privoxy 3.0.3 compatibility glue.
47 * - Moved randomization code into pick_from_range().
49 * - Changed parse_header_time definition.
50 * time_t isn't guaranteed to be signed and
51 * if it isn't, -1 isn't available as error code.
52 * Changed some variable types in client_if_modified_since()
53 * because of the same reason.
55 * Revision 1.39 2006/07/18 14:48:46 david__schmidt
56 * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
57 * with what was really the latest development (the v_3_0_branch branch)
59 * Revision 1.37.2.4 2003/12/01 14:45:14 oes
60 * Fixed two more problems with wildcarding in simplematch()
62 * Revision 1.37.2.3 2003/11/20 11:39:24 oes
63 * Bugfix: The "?" wildcard for domain names had never been implemented. Ooops\!
65 * Revision 1.37.2.2 2002/11/12 14:28:18 oes
66 * Proper backtracking in simplematch; fixes bug #632888
68 * Revision 1.37.2.1 2002/09/25 12:58:51 oes
69 * Made strcmpic and strncmpic safe against NULL arguments
70 * (which are now treated as empty strings).
72 * Revision 1.37 2002/04/26 18:29:43 jongfoster
73 * Fixing this Visual C++ warning:
74 * miscutil.c(710) : warning C4090: '=' : different 'const' qualifiers
76 * Revision 1.36 2002/04/26 12:55:38 oes
77 * New function string_toupper
79 * Revision 1.35 2002/03/26 22:29:55 swa
80 * we have a new homepage!
82 * Revision 1.34 2002/03/24 13:25:43 swa
83 * name change related issues
85 * Revision 1.33 2002/03/07 03:46:53 oes
86 * Fixed compiler warnings etc
88 * Revision 1.32 2002/03/06 23:02:57 jongfoster
91 * Revision 1.31 2002/03/05 04:52:42 oes
92 * Deleted non-errlog debugging code
94 * Revision 1.30 2002/03/04 18:27:42 oes
95 * - Deleted deletePidFile
96 * - Made write_pid_file use the --pidfile option value
97 * (or no PID file, if the option was absent)
98 * - Played styleguide police
100 * Revision 1.29 2002/03/04 02:08:02 david__schmidt
101 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
103 * Revision 1.28 2002/03/03 09:18:03 joergs
104 * Made jumbjuster work on AmigaOS again.
106 * Revision 1.27 2002/01/21 00:52:32 jongfoster
107 * Adding string_join()
109 * Revision 1.26 2001/12/30 14:07:32 steudten
110 * - Add signal handling (unix)
111 * - Add SIGHUP handler (unix)
112 * - Add creation of pidfile (unix)
113 * - Add action 'top' in rc file (RH)
114 * - Add entry 'SIGNALS' to manpage
115 * - Add exit message to logfile (unix)
117 * Revision 1.25 2001/11/13 00:16:38 jongfoster
118 * Replacing references to malloc.h with the standard stdlib.h
119 * (See ANSI or K&R 2nd Ed)
121 * Revision 1.24 2001/11/05 21:41:43 steudten
122 * Add changes to be a real daemon just for unix os.
123 * (change cwd to /, detach from controlling tty, set
124 * process group and session leader to the own process.
126 * Add some fatal-error log message for failed malloc().
127 * Add '-d' if compiled with 'configure --with-debug' to
128 * enable debug output.
130 * Revision 1.23 2001/10/29 03:48:10 david__schmidt
131 * OS/2 native needed a snprintf() routine. Added one to miscutil, brackedted
132 * by and __OS2__ ifdef.
134 * Revision 1.22 2001/10/26 17:39:38 oes
135 * Moved ijb_isspace and ijb_tolower to project.h
137 * Revision 1.21 2001/10/23 21:27:50 jongfoster
138 * Standardising error codes in string_append
139 * make_path() no longer adds '\\' if the dir already ends in '\\' (this
140 * is just copying a UNIX-specific fix to the Windows-specific part)
142 * Revision 1.20 2001/10/22 15:33:56 david__schmidt
143 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
144 * filters.c. Added a FIXME in front of the offending code. I'll gladly
145 * put in a better/more robust fix for all parties if one is presented...
146 * It seems that just returning 200 instead of 404 would pretty much fix
147 * it for everyone, but I don't know all the history of the problem.
149 * Revision 1.19 2001/10/14 22:02:57 jongfoster
150 * New function string_append() which is like strsav(), but running
151 * out of memory isn't automatically FATAL.
153 * Revision 1.18 2001/09/20 13:33:43 steudten
155 * change long to int as return value in hash_string(). Remember the wraparound
156 * for int = long = sizeof(4) - thats maybe not what we want.
158 * Revision 1.17 2001/09/13 20:51:29 jongfoster
159 * Fixing potential problems with characters >=128 in simplematch()
160 * This was also a compiler warning.
162 * Revision 1.16 2001/09/10 10:56:59 oes
163 * Silenced compiler warnings
165 * Revision 1.15 2001/07/13 14:02:24 oes
166 * Removed vim-settings
168 * Revision 1.14 2001/06/29 21:45:41 oes
169 * Indentation, CRLF->LF, Tab-> Space
171 * Revision 1.13 2001/06/29 13:32:14 oes
172 * Removed logentry from cancelled commit
174 * Revision 1.12 2001/06/09 10:55:28 jongfoster
175 * Changing BUFSIZ ==> BUFFER_SIZE
177 * Revision 1.11 2001/06/07 23:09:19 jongfoster
178 * Cosmetic indentation changes.
180 * Revision 1.10 2001/06/07 14:51:38 joergs
181 * make_path() no longer adds '/' if the dir already ends in '/'.
183 * Revision 1.9 2001/06/07 14:43:17 swa
184 * slight mistake in make_path, unix path style is /.
186 * Revision 1.8 2001/06/05 22:32:01 jongfoster
187 * New function make_path() to splice directory and file names together.
189 * Revision 1.7 2001/06/03 19:12:30 oes
190 * introduced bindup()
192 * Revision 1.6 2001/06/01 18:14:49 jongfoster
193 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
194 * in config.h if appropriate) rather than the NO_STRERR macro.
196 * Revision 1.5 2001/06/01 10:31:51 oes
197 * Added character class matching to trivimatch; renamed to simplematch
199 * Revision 1.4 2001/05/31 17:32:31 oes
201 * - Enhanced domain part globbing with infix and prefix asterisk
202 * matching and optional unanchored operation
204 * Revision 1.3 2001/05/29 23:10:09 oes
207 * - Introduced chomp()
208 * - Moved strsav() from showargs to miscutil
210 * Revision 1.2 2001/05/29 09:50:24 jongfoster
211 * Unified blocklist/imagelist/permissionslist.
212 * File format is still under discussion, but the internal changes
215 * Also modified interceptor behaviour:
216 * - We now intercept all URLs beginning with one of the following
217 * prefixes (and *only* these prefixes):
219 * * http://ijbswa.sf.net/config/
220 * * http://ijbswa.sourceforge.net/config/
221 * - New interceptors "home page" - go to http://i.j.b/ to see it.
222 * - Internal changes so that intercepted and fast redirect pages
223 * are not replaced with an image.
224 * - Interceptors now have the option to send a binary page direct
225 * to the client. (i.e. ijb-send-banner uses this)
226 * - Implemented show-url-info interceptor. (Which is why I needed
227 * the above interceptors changes - a typical URL is
228 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
229 * The previous mechanism would not have intercepted that, and
230 * if it had been intercepted then it then it would have replaced
233 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
234 * Initial import of version 2.9.3 source tree
237 *********************************************************************/
243 #include <sys/types.h>
245 #if !defined(_WIN32) && !defined(__OS2__)
247 #endif /* #if !defined(_WIN32) && !defined(__OS2__) */
254 #endif /* #ifndef HAVE_TIMEGM */
257 #include "miscutil.h"
261 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
263 /*********************************************************************
267 * Description : Malloc some memory and set it to '\0'.
268 * The way calloc() ought to be -acjc
271 * 1 : size = Size of memory chunk to return.
273 * Returns : Pointer to newly malloc'd memory chunk.
275 *********************************************************************/
276 void *zalloc(size_t size)
280 if ((ret = (void *)malloc(size)) != NULL)
282 memset(ret, 0, size);
291 /*********************************************************************
293 * Function : write_pid_file
295 * Description : Writes a pid file with the pid of the main process
301 *********************************************************************/
302 void write_pid_file(void)
307 * If no --pidfile option was given,
308 * we can live without one.
310 if (pidfile == NULL) return;
312 if ((fp = fopen(pidfile, "w")) == NULL)
314 log_error(LOG_LEVEL_INFO, "can't open pidfile '%s': %E", pidfile);
318 fprintf(fp, "%u\n", (unsigned int) getpid());
324 #endif /* def unix */
327 /*********************************************************************
329 * Function : hash_string
331 * Description : Take a string and compute a (hopefuly) unique numeric
332 * integer value. This has several uses, but being able
333 * to "switch" a string the one of my favorites.
336 * 1 : s : string to be hashed.
338 * Returns : an unsigned long variable with the hashed value.
340 *********************************************************************/
341 unsigned int hash_string( const char* s )
356 /*********************************************************************
360 * Description : For some reason (which is beyond me), gcc and WIN32
361 * don't like strdup. When a "free" is executed on a
362 * strdup'd ptr, it can at times freez up! So I just
363 * replaced it and problem was solved.
366 * 1 : s = string to duplicate
368 * Returns : Pointer to newly malloc'ed copy of the string.
370 *********************************************************************/
371 char *strdup( const char *s )
373 char * result = (char *)malloc( strlen(s)+1 );
383 #endif /* def __MINGW32__ */
387 /*********************************************************************
389 * Function : safe_strerror
391 * Description : Variant of the library routine strerror() which will
392 * work on systems without the library routine, and
393 * which should never return NULL.
396 * 1 : err = the `errno' of the last operation.
398 * Returns : An "English" string of the last `errno'. Allocated
399 * with strdup(), so caller frees. May be NULL if the
400 * system is out of memory.
402 *********************************************************************/
403 char *safe_strerror(int err)
406 char buf[BUFFER_SIZE];
411 #endif /* HAVE_STRERROR */
415 sprintf(buf, "(errno = %d)", err);
424 /*********************************************************************
426 * Function : strcmpic
428 * Description : Case insensitive string comparison
431 * 1 : s1 = string 1 to compare
432 * 2 : s2 = string 2 to compare
434 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
436 *********************************************************************/
437 int strcmpic(const char *s1, const char *s2)
444 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
450 return(ijb_tolower(*s1) - ijb_tolower(*s2));
455 /*********************************************************************
457 * Function : strncmpic
459 * Description : Case insensitive string comparison (upto n characters)
462 * 1 : s1 = string 1 to compare
463 * 2 : s2 = string 2 to compare
464 * 3 : n = maximum characters to compare
466 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
468 *********************************************************************/
469 int strncmpic(const char *s1, const char *s2, size_t n)
471 if (n <= 0) return(0);
477 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
486 return(ijb_tolower(*s1) - ijb_tolower(*s2));
491 /*********************************************************************
495 * Description : In-situ-eliminate all leading and trailing whitespace
499 * 1 : s : string to be chomped.
501 * Returns : chomped string
503 *********************************************************************/
504 char *chomp(char *string)
509 * strip trailing whitespace
511 p = string + strlen(string);
512 while (p > string && ijb_isspace(*(p-1)))
519 * find end of leading whitespace
522 while (*q && ijb_isspace(*q))
528 * if there was any, move the rest forwards
543 /*********************************************************************
547 * Description : Reallocate "old" and append text to it. This makes
548 * it easier to append to malloc'd strings.
549 * Running out of memory is a FATAL error.
552 * 1 : old = Old text that is to be extended. Will be
553 * free()d by this routine. May be NULL.
554 * 2 : text_to_append = Text to be appended to old.
557 * Returns : Pointer to newly malloc'ed appended string.
558 * If there is no text to append, return old. Caller
561 *********************************************************************/
562 char *strsav(char *old, const char *text_to_append)
564 size_t old_len, new_len = 0;
567 if ((text_to_append == NULL) || (*text_to_append == '\0'))
574 if ((p = strdup(text_to_append)) == NULL)
576 log_error(LOG_LEVEL_FATAL, "strdup() failed!");
577 /* Never get here - LOG_LEVEL_FATAL causes program exit */
582 old_len = strlen(old);
583 new_len = old_len + strlen(text_to_append) + 1;
585 if ((p = realloc(old, new_len)) == NULL)
587 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
588 /* Never get here - LOG_LEVEL_FATAL causes program exit */
591 strcpy(p + old_len, text_to_append);
596 /*********************************************************************
598 * Function : string_append
600 * Description : Reallocate target_string and append text to it.
601 * This makes it easier to append to malloc'd strings.
602 * This is similar to the (removed) strsav(), but
603 * running out of memory isn't catastrophic.
607 * The following style provides sufficient error
608 * checking for this routine, with minimal clutter
609 * in the source code. It is recommended if you
610 * have many calls to this function:
612 * char * s = strdup(...); // don't check for error
613 * string_append(&s, ...); // don't check for error
614 * string_append(&s, ...); // don't check for error
615 * string_append(&s, ...); // don't check for error
616 * if (NULL == s) { ... handle error ... }
620 * char * s = strdup(...); // don't check for error
621 * string_append(&s, ...); // don't check for error
622 * string_append(&s, ...); // don't check for error
623 * if (string_append(&s, ...)) {... handle error ...}
626 * 1 : target_string = Pointer to old text that is to be
627 * extended. *target_string will be free()d by this
628 * routine. target_string must be non-NULL.
629 * If *target_string is NULL, this routine will
630 * do nothing and return with an error - this allows
631 * you to make many calls to this routine and only
632 * check for errors after the last one.
633 * 2 : text_to_append = Text to be appended to old.
636 * Returns : JB_ERR_OK on success, and sets *target_string
637 * to newly malloc'ed appended string. Caller
638 * must free(*target_string).
639 * JB_ERR_MEMORY on out-of-memory. (And free()s
640 * *target_string and sets it to NULL).
641 * JB_ERR_MEMORY if *target_string is NULL.
643 *********************************************************************/
644 jb_err string_append(char **target_string, const char *text_to_append)
649 assert(target_string);
650 assert(text_to_append);
652 if (*target_string == NULL)
654 return JB_ERR_MEMORY;
657 if (*text_to_append == '\0')
662 old_len = strlen(*target_string);
664 if (NULL == (new_string = realloc(*target_string,
665 strlen(text_to_append) + old_len + 1)))
667 free(*target_string);
669 *target_string = NULL;
670 return JB_ERR_MEMORY;
673 strcpy(new_string + old_len, text_to_append);
675 *target_string = new_string;
680 /*********************************************************************
682 * Function : string_join
684 * Description : Join two strings together. Frees BOTH the original
685 * strings. If either or both input strings are NULL,
686 * fails as if it had run out of memory.
688 * For comparison, string_append requires that the
689 * second string is non-NULL, and doesn't free it.
691 * Rationale: Too often, we want to do
692 * string_append(s, html_encode(s2)). That assert()s
693 * if s2 is NULL or if html_encode() runs out of memory.
694 * It also leaks memory. Proper checking is cumbersome.
695 * The solution: string_join(s, html_encode(s2)) is safe,
696 * and will free the memory allocated by html_encode().
699 * 1 : target_string = Pointer to old text that is to be
700 * extended. *target_string will be free()d by this
701 * routine. target_string must be non-NULL.
702 * 2 : text_to_append = Text to be appended to old.
704 * Returns : JB_ERR_OK on success, and sets *target_string
705 * to newly malloc'ed appended string. Caller
706 * must free(*target_string).
707 * JB_ERR_MEMORY on out-of-memory, or if
708 * *target_string or text_to_append is NULL. (In
709 * this case, frees *target_string and text_to_append,
710 * sets *target_string to NULL).
712 *********************************************************************/
713 jb_err string_join(char **target_string, char *text_to_append)
717 assert(target_string);
719 if (text_to_append == NULL)
721 freez(*target_string);
722 return JB_ERR_MEMORY;
725 err = string_append(target_string, text_to_append);
727 free(text_to_append);
733 /*********************************************************************
735 * Function : string_toupper
737 * Description : Produce a copy of string with all convertible
738 * characters converted to uppercase.
741 * 1 : string = string to convert
743 * Returns : Uppercase copy of string if possible,
744 * NULL on out-of-memory or if string was NULL.
746 *********************************************************************/
747 char *string_toupper(const char *string)
752 if (!string || ((result = (char *) zalloc(strlen(string) + 1)) == NULL))
762 *p++ = toupper(*q++);
770 /*********************************************************************
772 * Function : simplematch
774 * Description : String matching, with a (greedy) '*' wildcard that
775 * stands for zero or more arbitrary characters and
776 * character classes in [], which take both enumerations
780 * 1 : pattern = pattern for matching
781 * 2 : text = text to be matched
783 * Returns : 0 if match, else nonzero
785 *********************************************************************/
786 int simplematch(char *pattern, char *text)
788 unsigned char *pat = (unsigned char *) pattern;
789 unsigned char *txt = (unsigned char *) text;
790 unsigned char *fallback = pat;
793 unsigned char lastchar = 'a';
795 unsigned char charmap[32];
800 /* EOF pattern but !EOF text? */
813 /* '*' in the pattern? */
817 /* The pattern ends afterwards? Speed up the return. */
823 /* Else, set wildcard mode and remember position after '*' */
828 /* Character range specification? */
831 memset(charmap, '\0', sizeof(charmap));
833 while (*++pat != ']')
839 else if (*pat == '-')
841 if ((*++pat == ']') || *pat == '\0')
845 for(i = lastchar; i <= *pat; i++)
847 charmap[i / 8] |= (1 << (i % 8));
852 charmap[*pat / 8] |= (1 << (*pat % 8));
856 } /* -END- if Character range specification */
860 * Char match, or char range match?
864 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
874 * No match && no wildcard: No luck
878 else if (pat != fallback)
881 * Wildcard mode && nonmatch beyond fallback: Rewind pattern
888 /* Cut off extra '*'s */
889 if(*pat == '*') pat++;
891 /* If this is the pattern's end, fine! */
897 /*********************************************************************
901 * Description : Duplicate the first n characters of a string that may
902 * contain '\0' characters.
905 * 1 : string = string to be duplicated
906 * 2 : len = number of bytes to duplicate
908 * Returns : pointer to copy, or NULL if failiure
910 *********************************************************************/
911 char *bindup(const char *string, size_t len)
915 if (NULL == (duplicate = (char *)malloc(len)))
921 memcpy(duplicate, string, len);
929 /*********************************************************************
931 * Function : make_path
933 * Description : Takes a directory name and a file name, returns
934 * the complete path. Handles windows/unix differences.
935 * If the file name is already an absolute path, or if
936 * the directory name is NULL or empty, it returns
940 * 1 : dir: Name of directory or NULL for none.
941 * 2 : file: Name of file. Should not be NULL or empty.
943 * Returns : "dir/file" (Or on windows, "dir\file").
944 * It allocates the string on the heap. Caller frees.
945 * Returns NULL in error (i.e. NULL file or out of
948 *********************************************************************/
949 char * make_path(const char * dir, const char * file)
960 strncpy(path,dir+2,512);
964 strncpy(path,dir+1,512);
969 strncpy(path,dir,512);
975 if(AddPart(path,file,512))
981 #else /* ndef AMIGA */
983 if ((file == NULL) || (*file == '\0'))
985 return NULL; /* Error */
988 if ((dir == NULL) || (*dir == '\0') /* No directory specified */
989 #if defined(_WIN32) || defined(__OS2__)
990 || (*file == '\\') || (file[1] == ':') /* Absolute path (DOS) */
991 #else /* ifndef _WIN32 || __OS2__ */
992 || (*file == '/') /* Absolute path (U*ix) */
993 #endif /* ifndef _WIN32 || __OS2__ */
1003 if ( *dir != '/' && basedir && *basedir )
1005 path = malloc( strlen( basedir ) + strlen(dir) + strlen(file) + 3);
1006 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1007 strcpy(path, basedir);
1013 path = malloc(strlen(dir) + strlen(file) + 2);
1014 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1019 path = malloc(strlen(dir) + strlen(file) + 2);
1020 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
1023 #endif /* defined unix */
1025 #if defined(_WIN32) || defined(__OS2__)
1026 if(path[strlen(path)-1] != '\\')
1030 #else /* ifndef _WIN32 || __OS2__ */
1031 if(path[strlen(path)-1] != '/')
1035 #endif /* ifndef _WIN32 || __OS2__ */
1040 #endif /* ndef AMIGA */
1044 /*********************************************************************
1046 * Function : pick_from_range
1048 * Description : Pick a positive number out of a given range.
1049 * Should only be used if randomness would be nice,
1050 * but isn't really necessary.
1053 * 1 : range: Highest possible number to pick.
1055 * Returns : Picked number.
1057 *********************************************************************/
1059 long int pick_from_range(long int range)
1063 unsigned int weak_seed;
1065 weak_seed = (unsigned int)((unsigned int)time(NULL) | (unsigned int)range);
1068 * Some rand implementations aren't that random and return mostly
1069 * lower numbers. Low entropy doesn't matter for the header times,
1070 * but higher "random" factors are prefered.
1072 number = (rand() * 12345) % (long int)(range + 1);
1073 /* Overflows don't matter either, positive numbers do. */
1079 number = random() % range + 1;
1080 #endif /* (ifndef HAVE_RANDOM) */
1086 /*********************************************************************
1090 * Description : libc replacement function for the inverse of gmtime()
1091 * Copyright (C) 2004 Free Software Foundation, Inc.
1092 * Code copied from GnuPG with minor style changes.
1095 * 1 : tm: Broken-down time struct.
1097 * Returns : tm converted into time_t seconds.
1099 *********************************************************************/
1101 time_t timegm(struct tm *tm)
1114 old_zone=malloc(3+strlen(zone)+1);
1117 strcpy(old_zone,"TZ=");
1118 strcat(old_zone,zone);
1124 #ifdef HAVE_UNSETENV
1133 #endif /* (ifndef HAVE_TIMEGM) */
1137 * What follows is a portable snprintf routine, written by Mark Martinec.
1138 * See: http://www.ijs.si/software/snprintf/
1139 * Anyone who needs it can add a define for themselves... so far, only
1140 * OS/2 (native) lacks snprintf.
1143 - a portable implementation of snprintf,
1144 including vsnprintf.c, asnprintf, vasnprintf, asprintf, vasprintf
1146 snprintf is a routine to convert numeric and string arguments to
1147 formatted strings. It is similar to sprintf(3) provided in a system's
1148 C library, yet it requires an additional argument - the buffer size -
1149 and it guarantees never to store anything beyond the given buffer,
1150 regardless of the format or arguments to be formatted. Some newer
1151 operating systems do provide snprintf in their C library, but many do
1152 not or do provide an inadequate (slow or idiosyncratic) version, which
1153 calls for a portable implementation of this routine.
1157 Mark Martinec <mark.martinec@ijs.si>, April 1999, June 2000
1158 Copyright © 1999, Mark Martinec
1164 #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
1165 #define PORTABLE_SNPRINTF_VERSION_MINOR 2
1167 #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
1168 # if defined(NEED_SNPRINTF_ONLY)
1169 # undef NEED_SNPRINTF_ONLY
1171 # if !defined(PREFER_PORTABLE_SNPRINTF)
1172 # define PREFER_PORTABLE_SNPRINTF
1176 #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
1177 #define SOLARIS_COMPATIBLE
1180 #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1181 #define HPUX_COMPATIBLE
1184 #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
1185 #define DIGITAL_UNIX_COMPATIBLE
1188 #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
1189 #define PERL_COMPATIBLE
1192 #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
1193 #define LINUX_COMPATIBLE
1196 #include <sys/types.h>
1207 #define isdigit(c) ((c) >= '0' && (c) <= '9')
1209 /* For copying strings longer or equal to 'breakeven_point'
1210 * it is more efficient to call memcpy() than to do it inline.
1211 * The value depends mostly on the processor architecture,
1212 * but also on the compiler and its optimization capabilities.
1213 * The value is not critical, some small value greater than zero
1214 * will be just fine if you don't care to squeeze every drop
1215 * of performance out of the code.
1217 * Small values favor memcpy, large values favor inline code.
1219 #if defined(__alpha__) || defined(__alpha)
1220 # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
1222 #if defined(__i386__) || defined(__i386)
1223 # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
1226 # define breakeven_point 10 /* HP-PA - gcc */
1228 #if defined(__sparc__) || defined(__sparc)
1229 # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
1232 /* some other values of possible interest: */
1233 /* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
1234 /* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
1236 #ifndef breakeven_point
1237 # define breakeven_point 6 /* some reasonable one-size-fits-all value */
1240 #define fast_memcpy(d,s,n) \
1241 { register size_t nn = (size_t)(n); \
1242 if (nn >= breakeven_point) memcpy((d), (s), nn); \
1243 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1244 register char *dd; register const char *ss; \
1245 for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
1247 #define fast_memset(d,c,n) \
1248 { register size_t nn = (size_t)(n); \
1249 if (nn >= breakeven_point) memset((d), (int)(c), nn); \
1250 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1251 register char *dd; register const int cc=(int)(c); \
1252 for (dd=(d); nn>0; nn--) *dd++ = cc; } }
1256 #if defined(NEED_ASPRINTF)
1257 int asprintf (char **ptr, const char *fmt, /*args*/ ...);
1259 #if defined(NEED_VASPRINTF)
1260 int vasprintf (char **ptr, const char *fmt, va_list ap);
1262 #if defined(NEED_ASNPRINTF)
1263 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
1265 #if defined(NEED_VASNPRINTF)
1266 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
1269 #if defined(HAVE_SNPRINTF)
1270 /* declare our portable snprintf routine under name portable_snprintf */
1271 /* declare our portable vsnprintf routine under name portable_vsnprintf */
1273 /* declare our portable routines under names snprintf and vsnprintf */
1274 #define portable_snprintf snprintf
1275 #if !defined(NEED_SNPRINTF_ONLY)
1276 #define portable_vsnprintf vsnprintf
1280 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1281 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
1282 #if !defined(NEED_SNPRINTF_ONLY)
1283 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
1289 static char credits[] = "\n\
1290 @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
1291 @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
1292 @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
1294 #if defined(NEED_ASPRINTF)
1295 int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
1301 va_start(ap, fmt); /* measure the required size */
1302 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1304 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1305 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1306 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1310 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1312 assert(str_l2 == str_l);
1318 #if defined(NEED_VASPRINTF)
1319 int vasprintf(char **ptr, const char *fmt, va_list ap) {
1325 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1326 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1329 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1330 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1331 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1333 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1334 assert(str_l2 == str_l);
1340 #if defined(NEED_ASNPRINTF)
1341 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
1346 va_start(ap, fmt); /* measure the required size */
1347 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1349 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1350 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1351 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1352 if (str_m == 0) { /* not interested in resulting string, just return size */
1354 *ptr = (char *) malloc(str_m);
1355 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1359 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1361 assert(str_l2 == str_l);
1368 #if defined(NEED_VASNPRINTF)
1369 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
1374 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1375 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1378 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1379 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1380 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1381 if (str_m == 0) { /* not interested in resulting string, just return size */
1383 *ptr = (char *) malloc(str_m);
1384 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1386 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1387 assert(str_l2 == str_l);
1395 * If the system does have snprintf and the portable routine is not
1396 * specifically required, this module produces no code for snprintf/vsnprintf.
1398 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1400 #if !defined(NEED_SNPRINTF_ONLY)
1401 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1406 str_l = portable_vsnprintf(str, str_m, fmt, ap);
1412 #if defined(NEED_SNPRINTF_ONLY)
1413 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1415 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
1418 #if defined(NEED_SNPRINTF_ONLY)
1422 const char *p = fmt;
1424 /* In contrast with POSIX, the ISO C99 now says
1425 * that str can be NULL and str_m can be 0.
1426 * This is more useful than the old: if (str_m < 1) return -1; */
1428 #if defined(NEED_SNPRINTF_ONLY)
1434 /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
1435 /* but the following code achieves better performance for cases
1436 * where format string is long and contains few conversions */
1437 const char *q = strchr(p+1,'%');
1438 size_t n = !q ? strlen(p) : (q-p);
1439 if (str_l < str_m) {
1440 size_t avail = str_m-str_l;
1441 fast_memcpy(str+str_l, p, (n>avail?avail:n));
1445 const char *starting_p;
1446 size_t min_field_width = 0, precision = 0;
1447 int zero_padding = 0, precision_specified = 0, justify_left = 0;
1448 int alternate_form = 0, force_sign = 0;
1449 int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
1450 the ' ' flag should be ignored. */
1451 char length_modifier = '\0'; /* allowed values: \0, h, l, L */
1452 char tmp[32];/* temporary buffer for simple numeric->string conversion */
1454 const char *str_arg; /* string address in case of string argument */
1455 size_t str_arg_l; /* natural field width of arg without padding
1457 unsigned char uchar_arg;
1458 /* unsigned char argument value - only defined for c conversion.
1459 N.B. standard explicitly states the char argument for
1460 the c conversion is unsigned */
1462 size_t number_of_zeros_to_pad = 0;
1463 /* number of zeros to be inserted for numeric conversions
1464 as required by the precision or minimal field width */
1466 size_t zero_padding_insertion_ind = 0;
1467 /* index into tmp where zero padding is to be inserted */
1469 char fmt_spec = '\0';
1470 /* current conversion specifier character */
1472 str_arg = credits;/* just to make compiler happy (defined but not used)*/
1474 starting_p = p; p++; /* skip '%' */
1476 while (*p == '0' || *p == '-' || *p == '+' ||
1477 *p == ' ' || *p == '#' || *p == '\'') {
1479 case '0': zero_padding = 1; break;
1480 case '-': justify_left = 1; break;
1481 case '+': force_sign = 1; space_for_positive = 0; break;
1482 case ' ': force_sign = 1;
1483 /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
1484 #ifdef PERL_COMPATIBLE
1485 /* ... but in Perl the last of ' ' and '+' applies */
1486 space_for_positive = 1;
1489 case '#': alternate_form = 1; break;
1494 /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
1496 /* parse field width */
1499 p++; j = va_arg(ap, int);
1500 if (j >= 0) min_field_width = j;
1501 else { min_field_width = -j; justify_left = 1; }
1502 } else if (isdigit((int)(*p))) {
1503 /* size_t could be wider than unsigned int;
1504 make sure we treat argument like common implementations do */
1505 unsigned int uj = *p++ - '0';
1506 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1507 min_field_width = uj;
1509 /* parse precision */
1511 p++; precision_specified = 1;
1513 int j = va_arg(ap, int);
1515 if (j >= 0) precision = j;
1517 precision_specified = 0; precision = 0;
1519 * Solaris 2.6 man page claims that in this case the precision
1520 * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
1521 * claim that this case should be treated as unspecified precision,
1522 * which is what we do here.
1525 } else if (isdigit((int)(*p))) {
1526 /* size_t could be wider than unsigned int;
1527 make sure we treat argument like common implementations do */
1528 unsigned int uj = *p++ - '0';
1529 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1533 /* parse 'h', 'l' and 'll' length modifiers */
1534 if (*p == 'h' || *p == 'l') {
1535 length_modifier = *p; p++;
1536 if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
1537 #ifdef SNPRINTF_LONGLONG_SUPPORT
1538 length_modifier = '2'; /* double l encoded as '2' */
1540 length_modifier = 'l'; /* treat it as a single 'l' */
1546 /* common synonyms: */
1548 case 'i': fmt_spec = 'd'; break;
1549 case 'D': fmt_spec = 'd'; length_modifier = 'l'; break;
1550 case 'U': fmt_spec = 'u'; length_modifier = 'l'; break;
1551 case 'O': fmt_spec = 'o'; length_modifier = 'l'; break;
1554 /* get parameter value, do initial processing */
1556 case '%': /* % behaves similar to 's' regarding flags and field widths */
1557 case 'c': /* c behaves similar to 's' regarding flags and field widths */
1559 length_modifier = '\0'; /* wint_t and wchar_t not supported */
1560 /* the result of zero padding flag with non-numeric conversion specifier*/
1561 /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
1562 /* Digital Unix and Linux does not. */
1563 #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1564 zero_padding = 0; /* turn zero padding off for string conversions */
1571 int j = va_arg(ap, int);
1572 uchar_arg = (unsigned char) j; /* standard demands unsigned char */
1573 str_arg = (const char *) &uchar_arg;
1577 str_arg = va_arg(ap, const char *);
1578 if (!str_arg) str_arg_l = 0;
1579 /* make sure not to address string beyond the specified precision !!! */
1580 else if (!precision_specified) str_arg_l = strlen(str_arg);
1581 /* truncate string if necessary as requested by precision */
1582 else if (precision == 0) str_arg_l = 0;
1584 /* memchr on HP does not like n > 2^31 !!! */
1585 const char *q = memchr(str_arg, '\0',
1586 precision <= 0x7fffffff ? precision : 0x7fffffff);
1587 str_arg_l = !q ? precision : (q-str_arg);
1593 case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': {
1594 /* NOTE: the u, o, x, X and p conversion specifiers imply
1595 the value is unsigned; d implies a signed value */
1598 /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
1599 +1 if greater than zero (or nonzero for unsigned arguments),
1600 -1 if negative (unsigned argument is never negative) */
1602 int int_arg = 0; unsigned int uint_arg = 0;
1603 /* only defined for length modifier h, or for no length modifiers */
1605 long int long_arg = 0; unsigned long int ulong_arg = 0;
1606 /* only defined for length modifier l */
1608 void *ptr_arg = NULL;
1609 /* pointer argument value -only defined for p conversion */
1611 #ifdef SNPRINTF_LONGLONG_SUPPORT
1612 long long int long_long_arg = 0;
1613 unsigned long long int ulong_long_arg = 0;
1614 /* only defined for length modifier ll */
1616 if (fmt_spec == 'p') {
1617 /* HPUX 10: An l, h, ll or L before any other conversion character
1618 * (other than d, i, u, o, x, or X) is ignored.
1620 * not specified, but seems to behave as HPUX does.
1621 * Solaris: If an h, l, or L appears before any other conversion
1622 * specifier (other than d, i, u, o, x, or X), the behavior
1623 * is undefined. (Actually %hp converts only 16-bits of address
1624 * and %llp treats address as 64-bit data which is incompatible
1625 * with (void *) argument on a 32-bit system).
1627 #ifdef SOLARIS_COMPATIBLE
1628 # ifdef SOLARIS_BUG_COMPATIBLE
1629 /* keep length modifiers even if it represents 'll' */
1631 if (length_modifier == '2') length_modifier = '\0';
1634 length_modifier = '\0';
1636 ptr_arg = va_arg(ap, void *);
1637 if (ptr_arg != NULL) arg_sign = 1;
1638 } else if (fmt_spec == 'd') { /* signed */
1639 switch (length_modifier) {
1642 /* It is non-portable to specify a second argument of char or short
1643 * to va_arg, because arguments seen by the called function
1644 * are not char or short. C converts char and short arguments
1645 * to int before passing them to a function.
1647 int_arg = va_arg(ap, int);
1648 if (int_arg > 0) arg_sign = 1;
1649 else if (int_arg < 0) arg_sign = -1;
1652 long_arg = va_arg(ap, long int);
1653 if (long_arg > 0) arg_sign = 1;
1654 else if (long_arg < 0) arg_sign = -1;
1656 #ifdef SNPRINTF_LONGLONG_SUPPORT
1658 long_long_arg = va_arg(ap, long long int);
1659 if (long_long_arg > 0) arg_sign = 1;
1660 else if (long_long_arg < 0) arg_sign = -1;
1664 } else { /* unsigned */
1665 switch (length_modifier) {
1668 uint_arg = va_arg(ap, unsigned int);
1669 if (uint_arg) arg_sign = 1;
1672 ulong_arg = va_arg(ap, unsigned long int);
1673 if (ulong_arg) arg_sign = 1;
1675 #ifdef SNPRINTF_LONGLONG_SUPPORT
1677 ulong_long_arg = va_arg(ap, unsigned long long int);
1678 if (ulong_long_arg) arg_sign = 1;
1683 str_arg = tmp; str_arg_l = 0;
1685 * For d, i, u, o, x, and X conversions, if precision is specified,
1686 * the '0' flag should be ignored. This is so with Solaris 2.6,
1687 * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
1689 #ifndef PERL_COMPATIBLE
1690 if (precision_specified) zero_padding = 0;
1692 if (fmt_spec == 'd') {
1693 if (force_sign && arg_sign >= 0)
1694 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1695 /* leave negative numbers for sprintf to handle,
1696 to avoid handling tricky cases like (short int)(-32768) */
1697 #ifdef LINUX_COMPATIBLE
1698 } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
1699 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1701 } else if (alternate_form) {
1702 if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') )
1703 { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
1704 /* alternate form should have no effect for p conversion, but ... */
1705 #ifdef HPUX_COMPATIBLE
1706 else if (fmt_spec == 'p'
1707 /* HPUX 10: for an alternate form of p conversion,
1708 * a nonzero result is prefixed by 0x. */
1709 #ifndef HPUX_BUG_COMPATIBLE
1710 /* Actually it uses 0x prefix even for a zero value. */
1713 ) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; }
1716 zero_padding_insertion_ind = str_arg_l;
1717 if (!precision_specified) precision = 1; /* default precision is 1 */
1718 if (precision == 0 && arg_sign == 0
1719 #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1721 /* HPUX 10 man page claims: With conversion character p the result of
1722 * converting a zero value with a precision of zero is a null string.
1723 * Actually HP returns all zeroes, and Linux returns "(nil)". */
1726 /* converted to null string */
1727 /* When zero value is formatted with an explicit precision 0,
1728 the resulting formatted string is empty (d, i, u, o, x, X, p). */
1730 char f[5]; int f_l = 0;
1731 f[f_l++] = '%'; /* construct a simple format string for sprintf */
1732 if (!length_modifier) { }
1733 else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
1734 else f[f_l++] = length_modifier;
1735 f[f_l++] = fmt_spec; f[f_l++] = '\0';
1736 if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
1737 else if (fmt_spec == 'd') { /* signed */
1738 switch (length_modifier) {
1740 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
1741 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
1742 #ifdef SNPRINTF_LONGLONG_SUPPORT
1743 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
1746 } else { /* unsigned */
1747 switch (length_modifier) {
1749 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
1750 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
1751 #ifdef SNPRINTF_LONGLONG_SUPPORT
1752 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
1756 /* include the optional minus sign and possible "0x"
1757 in the region before the zero padding insertion point */
1758 if (zero_padding_insertion_ind < str_arg_l &&
1759 tmp[zero_padding_insertion_ind] == '-') {
1760 zero_padding_insertion_ind++;
1762 if (zero_padding_insertion_ind+1 < str_arg_l &&
1763 tmp[zero_padding_insertion_ind] == '0' &&
1764 (tmp[zero_padding_insertion_ind+1] == 'x' ||
1765 tmp[zero_padding_insertion_ind+1] == 'X') ) {
1766 zero_padding_insertion_ind += 2;
1769 { size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
1770 if (alternate_form && fmt_spec == 'o'
1771 #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
1774 #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
1776 /* unless zero is already the first character */
1777 && !(zero_padding_insertion_ind < str_arg_l
1778 && tmp[zero_padding_insertion_ind] == '0')
1780 ) { /* assure leading zero for alternate-form octal numbers */
1781 if (!precision_specified || precision < num_of_digits+1) {
1782 /* precision is increased to force the first character to be zero,
1783 except if a zero value is formatted with an explicit precision
1785 precision = num_of_digits+1; precision_specified = 1;
1788 /* zero padding to specified precision? */
1789 if (num_of_digits < precision)
1790 number_of_zeros_to_pad = precision - num_of_digits;
1792 /* zero padding to specified minimal field width? */
1793 if (!justify_left && zero_padding) {
1794 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1795 if (n > 0) number_of_zeros_to_pad += n;
1799 default: /* unrecognized conversion specifier, keep format string as-is*/
1800 zero_padding = 0; /* turn zero padding off for non-numeric convers. */
1801 #ifndef DIGITAL_UNIX_COMPATIBLE
1802 justify_left = 1; min_field_width = 0; /* reset flags */
1804 #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1805 /* keep the entire format string unchanged */
1806 str_arg = starting_p; str_arg_l = p - starting_p;
1807 /* well, not exactly so for Linux, which does something inbetween,
1808 * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
1810 /* discard the unrecognized conversion, just keep *
1811 * the unrecognized conversion character */
1812 str_arg = p; str_arg_l = 0;
1814 if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
1815 if not at end-of-string */
1818 if (*p) p++; /* step over the just processed conversion specifier */
1819 /* insert padding to the left as requested by min_field_width;
1820 this does not include the zero padding in case of numerical conversions*/
1821 if (!justify_left) { /* left padding with blank or zero */
1822 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1824 if (str_l < str_m) {
1825 size_t avail = str_m-str_l;
1826 fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
1831 /* zero padding as requested by the precision or by the minimal field width
1832 * for numeric conversions required? */
1833 if (number_of_zeros_to_pad <= 0) {
1834 /* will not copy first part of numeric right now, *
1835 * force it to be copied later in its entirety */
1836 zero_padding_insertion_ind = 0;
1838 /* insert first part of numerics (sign or '0x') before zero padding */
1839 int n = zero_padding_insertion_ind;
1841 if (str_l < str_m) {
1842 size_t avail = str_m-str_l;
1843 fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
1847 /* insert zero padding as requested by the precision or min field width */
1848 n = number_of_zeros_to_pad;
1850 if (str_l < str_m) {
1851 size_t avail = str_m-str_l;
1852 fast_memset(str+str_l, '0', (n>avail?avail:n));
1857 /* insert formatted string
1858 * (or as-is conversion specifier for unknown conversions) */
1859 { int n = str_arg_l - zero_padding_insertion_ind;
1861 if (str_l < str_m) {
1862 size_t avail = str_m-str_l;
1863 fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
1869 /* insert right padding */
1870 if (justify_left) { /* right blank padding to the field width */
1871 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1873 if (str_l < str_m) {
1874 size_t avail = str_m-str_l;
1875 fast_memset(str+str_l, ' ', (n>avail?avail:n));
1882 #if defined(NEED_SNPRINTF_ONLY)
1885 if (str_m > 0) { /* make sure the string is null-terminated
1886 even at the expense of overwriting the last character
1887 (shouldn't happen, but just in case) */
1888 str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
1890 /* Return the number of characters formatted (excluding trailing null
1891 * character), that is, the number of characters that would have been
1892 * written to the buffer if it were large enough.
1894 * The value of str_l should be returned, but str_l is of unsigned type
1895 * size_t, and snprintf is int, possibly leading to an undetected
1896 * integer overflow, resulting in a negative return value, which is illegal.
1897 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1898 * Should errno be set to EOVERFLOW and EOF returned in this case???
1903 #endif /* __OS2__ */