1 const char miscutil_rcs[] = "$Id: miscutil.c,v 1.37 2002/04/26 18:29:43 jongfoster Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa//current/Attic/miscutil.c,v $
6 * Purpose : zalloc, hash_string, safe_strerror, strcmpic,
7 * strncmpic, chomp, and MinGW32 strdup
9 * These are each too small to deserve their own file
10 * but don't really fit in any other file.
12 * Copyright : Written by and Copyright (C) 2001 the SourceForge
13 * Privoxy team. http://www.privoxy.org/
15 * Based on the Internet Junkbuster originally written
16 * by and Copyright (C) 1997 Anonymous Coders and
17 * Junkbusters Corporation. http://www.junkbusters.com
19 * This program is free software; you can redistribute it
20 * and/or modify it under the terms of the GNU General
21 * Public License as published by the Free Software
22 * Foundation; either version 2 of the License, or (at
23 * your option) any later version.
25 * This program is distributed in the hope that it will
26 * be useful, but WITHOUT ANY WARRANTY; without even the
27 * implied warranty of MERCHANTABILITY or FITNESS FOR A
28 * PARTICULAR PURPOSE. See the GNU General Public
29 * License for more details.
31 * The GNU General Public License should be included with
32 * this file. If not, you can view it at
33 * http://www.gnu.org/copyleft/gpl.html
34 * or write to the Free Software Foundation, Inc., 59
35 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 * $Log: miscutil.c,v $
39 * Revision 1.37 2002/04/26 18:29:43 jongfoster
40 * Fixing this Visual C++ warning:
41 * miscutil.c(710) : warning C4090: '=' : different 'const' qualifiers
43 * Revision 1.36 2002/04/26 12:55:38 oes
44 * New function string_toupper
46 * Revision 1.35 2002/03/26 22:29:55 swa
47 * we have a new homepage!
49 * Revision 1.34 2002/03/24 13:25:43 swa
50 * name change related issues
52 * Revision 1.33 2002/03/07 03:46:53 oes
53 * Fixed compiler warnings etc
55 * Revision 1.32 2002/03/06 23:02:57 jongfoster
58 * Revision 1.31 2002/03/05 04:52:42 oes
59 * Deleted non-errlog debugging code
61 * Revision 1.30 2002/03/04 18:27:42 oes
62 * - Deleted deletePidFile
63 * - Made write_pid_file use the --pidfile option value
64 * (or no PID file, if the option was absent)
65 * - Played styleguide police
67 * Revision 1.29 2002/03/04 02:08:02 david__schmidt
68 * Enable web editing of actions file on OS/2 (it had been broken all this time!)
70 * Revision 1.28 2002/03/03 09:18:03 joergs
71 * Made jumbjuster work on AmigaOS again.
73 * Revision 1.27 2002/01/21 00:52:32 jongfoster
74 * Adding string_join()
76 * Revision 1.26 2001/12/30 14:07:32 steudten
77 * - Add signal handling (unix)
78 * - Add SIGHUP handler (unix)
79 * - Add creation of pidfile (unix)
80 * - Add action 'top' in rc file (RH)
81 * - Add entry 'SIGNALS' to manpage
82 * - Add exit message to logfile (unix)
84 * Revision 1.25 2001/11/13 00:16:38 jongfoster
85 * Replacing references to malloc.h with the standard stdlib.h
86 * (See ANSI or K&R 2nd Ed)
88 * Revision 1.24 2001/11/05 21:41:43 steudten
89 * Add changes to be a real daemon just for unix os.
90 * (change cwd to /, detach from controlling tty, set
91 * process group and session leader to the own process.
93 * Add some fatal-error log message for failed malloc().
94 * Add '-d' if compiled with 'configure --with-debug' to
95 * enable debug output.
97 * Revision 1.23 2001/10/29 03:48:10 david__schmidt
98 * OS/2 native needed a snprintf() routine. Added one to miscutil, brackedted
99 * by and __OS2__ ifdef.
101 * Revision 1.22 2001/10/26 17:39:38 oes
102 * Moved ijb_isspace and ijb_tolower to project.h
104 * Revision 1.21 2001/10/23 21:27:50 jongfoster
105 * Standardising error codes in string_append
106 * make_path() no longer adds '\\' if the dir already ends in '\\' (this
107 * is just copying a UNIX-specific fix to the Windows-specific part)
109 * Revision 1.20 2001/10/22 15:33:56 david__schmidt
110 * Special-cased OS/2 out of the Netscape-abort-on-404-in-js problem in
111 * filters.c. Added a FIXME in front of the offending code. I'll gladly
112 * put in a better/more robust fix for all parties if one is presented...
113 * It seems that just returning 200 instead of 404 would pretty much fix
114 * it for everyone, but I don't know all the history of the problem.
116 * Revision 1.19 2001/10/14 22:02:57 jongfoster
117 * New function string_append() which is like strsav(), but running
118 * out of memory isn't automatically FATAL.
120 * Revision 1.18 2001/09/20 13:33:43 steudten
122 * change long to int as return value in hash_string(). Remember the wraparound
123 * for int = long = sizeof(4) - thats maybe not what we want.
125 * Revision 1.17 2001/09/13 20:51:29 jongfoster
126 * Fixing potential problems with characters >=128 in simplematch()
127 * This was also a compiler warning.
129 * Revision 1.16 2001/09/10 10:56:59 oes
130 * Silenced compiler warnings
132 * Revision 1.15 2001/07/13 14:02:24 oes
133 * Removed vim-settings
135 * Revision 1.14 2001/06/29 21:45:41 oes
136 * Indentation, CRLF->LF, Tab-> Space
138 * Revision 1.13 2001/06/29 13:32:14 oes
139 * Removed logentry from cancelled commit
141 * Revision 1.12 2001/06/09 10:55:28 jongfoster
142 * Changing BUFSIZ ==> BUFFER_SIZE
144 * Revision 1.11 2001/06/07 23:09:19 jongfoster
145 * Cosmetic indentation changes.
147 * Revision 1.10 2001/06/07 14:51:38 joergs
148 * make_path() no longer adds '/' if the dir already ends in '/'.
150 * Revision 1.9 2001/06/07 14:43:17 swa
151 * slight mistake in make_path, unix path style is /.
153 * Revision 1.8 2001/06/05 22:32:01 jongfoster
154 * New function make_path() to splice directory and file names together.
156 * Revision 1.7 2001/06/03 19:12:30 oes
157 * introduced bindup()
159 * Revision 1.6 2001/06/01 18:14:49 jongfoster
160 * Changing the calls to strerr() to check HAVE_STRERR (which is defined
161 * in config.h if appropriate) rather than the NO_STRERR macro.
163 * Revision 1.5 2001/06/01 10:31:51 oes
164 * Added character class matching to trivimatch; renamed to simplematch
166 * Revision 1.4 2001/05/31 17:32:31 oes
168 * - Enhanced domain part globbing with infix and prefix asterisk
169 * matching and optional unanchored operation
171 * Revision 1.3 2001/05/29 23:10:09 oes
174 * - Introduced chomp()
175 * - Moved strsav() from showargs to miscutil
177 * Revision 1.2 2001/05/29 09:50:24 jongfoster
178 * Unified blocklist/imagelist/permissionslist.
179 * File format is still under discussion, but the internal changes
182 * Also modified interceptor behaviour:
183 * - We now intercept all URLs beginning with one of the following
184 * prefixes (and *only* these prefixes):
186 * * http://ijbswa.sf.net/config/
187 * * http://ijbswa.sourceforge.net/config/
188 * - New interceptors "home page" - go to http://i.j.b/ to see it.
189 * - Internal changes so that intercepted and fast redirect pages
190 * are not replaced with an image.
191 * - Interceptors now have the option to send a binary page direct
192 * to the client. (i.e. ijb-send-banner uses this)
193 * - Implemented show-url-info interceptor. (Which is why I needed
194 * the above interceptors changes - a typical URL is
195 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
196 * The previous mechanism would not have intercepted that, and
197 * if it had been intercepted then it then it would have replaced
200 * Revision 1.1.1.1 2001/05/15 13:59:00 oes
201 * Initial import of version 2.9.3 source tree
204 *********************************************************************/
210 #include <sys/types.h>
212 #if !defined(_WIN32) && !defined(__OS2__)
214 #endif /* #if !defined(_WIN32) && !defined(__OS2__) */
220 #include "miscutil.h"
224 const char miscutil_h_rcs[] = MISCUTIL_H_VERSION;
226 /*********************************************************************
230 * Description : Malloc some memory and set it to '\0'.
231 * The way calloc() ought to be -acjc
234 * 1 : size = Size of memory chunk to return.
236 * Returns : Pointer to newly malloc'd memory chunk.
238 *********************************************************************/
239 void *zalloc(size_t size)
243 if ((ret = (void *)malloc(size)) != NULL)
245 memset(ret, 0, size);
254 /*********************************************************************
256 * Function : write_pid_file
258 * Description : Writes a pid file with the pid of the main process
264 *********************************************************************/
265 void write_pid_file(void)
270 * If no --pidfile option was given,
271 * we can live without one.
273 if (pidfile == NULL) return;
275 if ((fp = fopen(pidfile, "w")) == NULL)
277 log_error(LOG_LEVEL_INFO, "can't open pidfile '%s': %E", pidfile);
281 fprintf(fp, "%u\n", (unsigned int) getpid());
287 #endif /* def unix */
290 /*********************************************************************
292 * Function : hash_string
294 * Description : Take a string and compute a (hopefuly) unique numeric
295 * integer value. This has several uses, but being able
296 * to "switch" a string the one of my favorites.
299 * 1 : s : string to be hashed.
301 * Returns : an unsigned long variable with the hashed value.
303 *********************************************************************/
304 unsigned int hash_string( const char* s )
319 /*********************************************************************
323 * Description : For some reason (which is beyond me), gcc and WIN32
324 * don't like strdup. When a "free" is executed on a
325 * strdup'd ptr, it can at times freez up! So I just
326 * replaced it and problem was solved.
329 * 1 : s = string to duplicate
331 * Returns : Pointer to newly malloc'ed copy of the string.
333 *********************************************************************/
334 char *strdup( const char *s )
336 char * result = (char *)malloc( strlen(s)+1 );
346 #endif /* def __MINGW32__ */
350 /*********************************************************************
352 * Function : safe_strerror
354 * Description : Variant of the library routine strerror() which will
355 * work on systems without the library routine, and
356 * which should never return NULL.
359 * 1 : err = the `errno' of the last operation.
361 * Returns : An "English" string of the last `errno'. Allocated
362 * with strdup(), so caller frees. May be NULL if the
363 * system is out of memory.
365 *********************************************************************/
366 char *safe_strerror(int err)
369 char buf[BUFFER_SIZE];
374 #endif /* HAVE_STRERROR */
378 sprintf(buf, "(errno = %d)", err);
387 /*********************************************************************
389 * Function : strcmpic
391 * Description : Case insensitive string comparison
394 * 1 : s1 = string 1 to compare
395 * 2 : s2 = string 2 to compare
397 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
399 *********************************************************************/
400 int strcmpic(const char *s1, const char *s2)
407 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
413 return(ijb_tolower(*s1) - ijb_tolower(*s2));
418 /*********************************************************************
420 * Function : strncmpic
422 * Description : Case insensitive string comparison (upto n characters)
425 * 1 : s1 = string 1 to compare
426 * 2 : s2 = string 2 to compare
427 * 3 : n = maximum characters to compare
429 * Returns : 0 if s1==s2, Negative if s1<s2, Positive if s1>s2
431 *********************************************************************/
432 int strncmpic(const char *s1, const char *s2, size_t n)
434 if (n <= 0) return(0);
440 if ( ( *s1 != *s2 ) && ( ijb_tolower(*s1) != ijb_tolower(*s2) ) )
449 return(ijb_tolower(*s1) - ijb_tolower(*s2));
454 /*********************************************************************
458 * Description : In-situ-eliminate all leading and trailing whitespace
462 * 1 : s : string to be chomped.
464 * Returns : chomped string
466 *********************************************************************/
467 char *chomp(char *string)
472 * strip trailing whitespace
474 p = string + strlen(string);
475 while (p > string && ijb_isspace(*(p-1)))
482 * find end of leading whitespace
485 while (*q && ijb_isspace(*q))
491 * if there was any, move the rest forwards
506 /*********************************************************************
510 * Description : Reallocate "old" and append text to it. This makes
511 * it easier to append to malloc'd strings.
512 * Running out of memory is a FATAL error.
515 * 1 : old = Old text that is to be extended. Will be
516 * free()d by this routine. May be NULL.
517 * 2 : text_to_append = Text to be appended to old.
520 * Returns : Pointer to newly malloc'ed appended string.
521 * If there is no text to append, return old. Caller
524 *********************************************************************/
525 char *strsav(char *old, const char *text_to_append)
527 size_t old_len, new_len = 0;
530 if ((text_to_append == NULL) || (*text_to_append == '\0'))
537 if ((p = strdup(text_to_append)) == NULL)
539 log_error(LOG_LEVEL_FATAL, "strdup() failed!");
540 /* Never get here - LOG_LEVEL_FATAL causes program exit */
545 old_len = strlen(old);
546 new_len = old_len + strlen(text_to_append) + 1;
548 if ((p = realloc(old, new_len)) == NULL)
550 log_error(LOG_LEVEL_FATAL, "realloc(%d) bytes failed!", new_len);
551 /* Never get here - LOG_LEVEL_FATAL causes program exit */
554 strcpy(p + old_len, text_to_append);
559 /*********************************************************************
561 * Function : string_append
563 * Description : Reallocate target_string and append text to it.
564 * This makes it easier to append to malloc'd strings.
565 * This is similar to the (removed) strsav(), but
566 * running out of memory isn't catastrophic.
570 * The following style provides sufficient error
571 * checking for this routine, with minimal clutter
572 * in the source code. It is recommended if you
573 * have many calls to this function:
575 * char * s = strdup(...); // don't check for error
576 * string_append(&s, ...); // don't check for error
577 * string_append(&s, ...); // don't check for error
578 * string_append(&s, ...); // don't check for error
579 * if (NULL == s) { ... handle error ... }
583 * char * s = strdup(...); // don't check for error
584 * string_append(&s, ...); // don't check for error
585 * string_append(&s, ...); // don't check for error
586 * if (string_append(&s, ...)) {... handle error ...}
589 * 1 : target_string = Pointer to old text that is to be
590 * extended. *target_string will be free()d by this
591 * routine. target_string must be non-NULL.
592 * If *target_string is NULL, this routine will
593 * do nothing and return with an error - this allows
594 * you to make many calls to this routine and only
595 * check for errors after the last one.
596 * 2 : text_to_append = Text to be appended to old.
599 * Returns : JB_ERR_OK on success, and sets *target_string
600 * to newly malloc'ed appended string. Caller
601 * must free(*target_string).
602 * JB_ERR_MEMORY on out-of-memory. (And free()s
603 * *target_string and sets it to NULL).
604 * JB_ERR_MEMORY if *target_string is NULL.
606 *********************************************************************/
607 jb_err string_append(char **target_string, const char *text_to_append)
612 assert(target_string);
613 assert(text_to_append);
615 if (*target_string == NULL)
617 return JB_ERR_MEMORY;
620 if (*text_to_append == '\0')
625 old_len = strlen(*target_string);
627 if (NULL == (new_string = realloc(*target_string,
628 strlen(text_to_append) + old_len + 1)))
630 free(*target_string);
632 *target_string = NULL;
633 return JB_ERR_MEMORY;
636 strcpy(new_string + old_len, text_to_append);
638 *target_string = new_string;
643 /*********************************************************************
645 * Function : string_join
647 * Description : Join two strings together. Frees BOTH the original
648 * strings. If either or both input strings are NULL,
649 * fails as if it had run out of memory.
651 * For comparison, string_append requires that the
652 * second string is non-NULL, and doesn't free it.
654 * Rationale: Too often, we want to do
655 * string_append(s, html_encode(s2)). That assert()s
656 * if s2 is NULL or if html_encode() runs out of memory.
657 * It also leaks memory. Proper checking is cumbersome.
658 * The solution: string_join(s, html_encode(s2)) is safe,
659 * and will free the memory allocated by html_encode().
662 * 1 : target_string = Pointer to old text that is to be
663 * extended. *target_string will be free()d by this
664 * routine. target_string must be non-NULL.
665 * 2 : text_to_append = Text to be appended to old.
667 * Returns : JB_ERR_OK on success, and sets *target_string
668 * to newly malloc'ed appended string. Caller
669 * must free(*target_string).
670 * JB_ERR_MEMORY on out-of-memory, or if
671 * *target_string or text_to_append is NULL. (In
672 * this case, frees *target_string and text_to_append,
673 * sets *target_string to NULL).
675 *********************************************************************/
676 jb_err string_join(char **target_string, char *text_to_append)
680 assert(target_string);
682 if (text_to_append == NULL)
684 freez(*target_string);
685 return JB_ERR_MEMORY;
688 err = string_append(target_string, text_to_append);
690 free(text_to_append);
696 /*********************************************************************
698 * Function : string_toupper
700 * Description : Produce a copy of string with all convertible
701 * characters converted to uppercase.
704 * 1 : string = string to convert
706 * Returns : Uppercase copy of string if possible,
707 * NULL on out-of-memory or if string was NULL.
709 *********************************************************************/
710 char *string_toupper(const char *string)
715 if (!string || ((result = (char *) zalloc(strlen(string) + 1)) == NULL))
725 *p++ = toupper(*q++);
733 /*********************************************************************
735 * Function : simplematch
737 * Description : String matching, with a (greedy) '*' wildcard that
738 * stands for zero or more arbitrary characters and
739 * character classes in [], which take both enumerations
743 * 1 : pattern = pattern for matching
744 * 2 : text = text to be matched
746 * Returns : 0 if match, else nonzero
748 *********************************************************************/
749 int simplematch(char *pattern, char *text)
751 unsigned char *pat = (unsigned char *) pattern;
752 unsigned char *txt = (unsigned char *) text;
753 unsigned char *fallback = pat;
756 unsigned char lastchar = 'a';
758 unsigned char charmap[32];
764 /* EOF pattern but !EOF text? */
770 /* '*' in the pattern? */
774 /* The pattern ends afterwards? Speed up the return. */
780 /* Else, set wildcard mode and remember position after '*' */
785 /* Character range specification? */
788 memset(charmap, '\0', sizeof(charmap));
790 while (*++pat != ']')
796 else if (*pat == '-')
798 if ((*++pat == ']') || *pat == '\0')
802 for(i = lastchar; i <= *pat; i++)
804 charmap[i / 8] |= (1 << (i % 8));
809 charmap[*pat / 8] |= (1 << (*pat % 8));
813 } /* -END- if Character range specification */
816 /* Compare: Char match, or char range match*/
818 || ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
820 /* Sucess, go ahead */
825 /* In wildcard mode, just try again after failiure */
840 /* Cut off extra '*'s */
841 if(*pat == '*') pat++;
843 /* If this is the pattern's end, fine! */
849 /*********************************************************************
853 * Description : Duplicate the first n characters of a string that may
854 * contain '\0' characters.
857 * 1 : string = string to be duplicated
858 * 2 : len = number of bytes to duplicate
860 * Returns : pointer to copy, or NULL if failiure
862 *********************************************************************/
863 char *bindup(const char *string, size_t len)
867 if (NULL == (duplicate = (char *)malloc(len)))
873 memcpy(duplicate, string, len);
881 /*********************************************************************
883 * Function : make_path
885 * Description : Takes a directory name and a file name, returns
886 * the complete path. Handles windows/unix differences.
887 * If the file name is already an absolute path, or if
888 * the directory name is NULL or empty, it returns
892 * 1 : dir: Name of directory or NULL for none.
893 * 2 : file: Name of file. Should not be NULL or empty.
895 * Returns : "dir/file" (Or on windows, "dir\file").
896 * It allocates the string on the heap. Caller frees.
897 * Returns NULL in error (i.e. NULL file or out of
900 *********************************************************************/
901 char * make_path(const char * dir, const char * file)
912 strncpy(path,dir+2,512);
916 strncpy(path,dir+1,512);
921 strncpy(path,dir,512);
927 if(AddPart(path,file,512))
933 #else /* ndef AMIGA */
935 if ((file == NULL) || (*file == '\0'))
937 return NULL; /* Error */
940 if ((dir == NULL) || (*dir == '\0') /* No directory specified */
941 #if defined(_WIN32) || defined(__OS2__)
942 || (*file == '\\') || (file[1] == ':') /* Absolute path (DOS) */
943 #else /* ifndef _WIN32 || __OS2__ */
944 || (*file == '/') /* Absolute path (U*ix) */
945 #endif /* ifndef _WIN32 || __OS2__ */
955 if ( *dir != '/' && basedir && *basedir )
957 path = malloc( strlen( basedir ) + strlen(dir) + strlen(file) + 3);
958 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
959 strcpy(path, basedir);
965 path = malloc(strlen(dir) + strlen(file) + 2);
966 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
971 path = malloc(strlen(dir) + strlen(file) + 2);
972 if (!path ) log_error(LOG_LEVEL_FATAL, "malloc failed!");
975 #endif /* defined unix */
977 #if defined(_WIN32) || defined(__OS2__)
978 if(path[strlen(path)-1] != '\\')
982 #else /* ifndef _WIN32 || __OS2__ */
983 if(path[strlen(path)-1] != '/')
987 #endif /* ifndef _WIN32 || __OS2__ */
992 #endif /* ndef AMIGA */
997 * What follows is a portable snprintf routine, written by Mark Martinec.
998 * See: http://www.ijs.si/software/snprintf/
999 * Anyone who needs it can add a define for themselves... so far, only
1000 * OS/2 (native) lacks snprintf.
1003 - a portable implementation of snprintf,
1004 including vsnprintf.c, asnprintf, vasnprintf, asprintf, vasprintf
1006 snprintf is a routine to convert numeric and string arguments to
1007 formatted strings. It is similar to sprintf(3) provided in a system's
1008 C library, yet it requires an additional argument - the buffer size -
1009 and it guarantees never to store anything beyond the given buffer,
1010 regardless of the format or arguments to be formatted. Some newer
1011 operating systems do provide snprintf in their C library, but many do
1012 not or do provide an inadequate (slow or idiosyncratic) version, which
1013 calls for a portable implementation of this routine.
1017 Mark Martinec <mark.martinec@ijs.si>, April 1999, June 2000
1018 Copyright © 1999, Mark Martinec
1024 #define PORTABLE_SNPRINTF_VERSION_MAJOR 2
1025 #define PORTABLE_SNPRINTF_VERSION_MINOR 2
1027 #if defined(NEED_ASPRINTF) || defined(NEED_ASNPRINTF) || defined(NEED_VASPRINTF) || defined(NEED_VASNPRINTF)
1028 # if defined(NEED_SNPRINTF_ONLY)
1029 # undef NEED_SNPRINTF_ONLY
1031 # if !defined(PREFER_PORTABLE_SNPRINTF)
1032 # define PREFER_PORTABLE_SNPRINTF
1036 #if defined(SOLARIS_BUG_COMPATIBLE) && !defined(SOLARIS_COMPATIBLE)
1037 #define SOLARIS_COMPATIBLE
1040 #if defined(HPUX_BUG_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1041 #define HPUX_COMPATIBLE
1044 #if defined(DIGITAL_UNIX_BUG_COMPATIBLE) && !defined(DIGITAL_UNIX_COMPATIBLE)
1045 #define DIGITAL_UNIX_COMPATIBLE
1048 #if defined(PERL_BUG_COMPATIBLE) && !defined(PERL_COMPATIBLE)
1049 #define PERL_COMPATIBLE
1052 #if defined(LINUX_BUG_COMPATIBLE) && !defined(LINUX_COMPATIBLE)
1053 #define LINUX_COMPATIBLE
1056 #include <sys/types.h>
1067 #define isdigit(c) ((c) >= '0' && (c) <= '9')
1069 /* For copying strings longer or equal to 'breakeven_point'
1070 * it is more efficient to call memcpy() than to do it inline.
1071 * The value depends mostly on the processor architecture,
1072 * but also on the compiler and its optimization capabilities.
1073 * The value is not critical, some small value greater than zero
1074 * will be just fine if you don't care to squeeze every drop
1075 * of performance out of the code.
1077 * Small values favor memcpy, large values favor inline code.
1079 #if defined(__alpha__) || defined(__alpha)
1080 # define breakeven_point 2 /* AXP (DEC Alpha) - gcc or cc or egcs */
1082 #if defined(__i386__) || defined(__i386)
1083 # define breakeven_point 12 /* Intel Pentium/Linux - gcc 2.96 */
1086 # define breakeven_point 10 /* HP-PA - gcc */
1088 #if defined(__sparc__) || defined(__sparc)
1089 # define breakeven_point 33 /* Sun Sparc 5 - gcc 2.8.1 */
1092 /* some other values of possible interest: */
1093 /* #define breakeven_point 8 */ /* VAX 4000 - vaxc */
1094 /* #define breakeven_point 19 */ /* VAX 4000 - gcc 2.7.0 */
1096 #ifndef breakeven_point
1097 # define breakeven_point 6 /* some reasonable one-size-fits-all value */
1100 #define fast_memcpy(d,s,n) \
1101 { register size_t nn = (size_t)(n); \
1102 if (nn >= breakeven_point) memcpy((d), (s), nn); \
1103 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1104 register char *dd; register const char *ss; \
1105 for (ss=(s), dd=(d); nn>0; nn--) *dd++ = *ss++; } }
1107 #define fast_memset(d,c,n) \
1108 { register size_t nn = (size_t)(n); \
1109 if (nn >= breakeven_point) memset((d), (int)(c), nn); \
1110 else if (nn > 0) { /* proc call overhead is worth only for large strings*/\
1111 register char *dd; register const int cc=(int)(c); \
1112 for (dd=(d); nn>0; nn--) *dd++ = cc; } }
1116 #if defined(NEED_ASPRINTF)
1117 int asprintf (char **ptr, const char *fmt, /*args*/ ...);
1119 #if defined(NEED_VASPRINTF)
1120 int vasprintf (char **ptr, const char *fmt, va_list ap);
1122 #if defined(NEED_ASNPRINTF)
1123 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...);
1125 #if defined(NEED_VASNPRINTF)
1126 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap);
1129 #if defined(HAVE_SNPRINTF)
1130 /* declare our portable snprintf routine under name portable_snprintf */
1131 /* declare our portable vsnprintf routine under name portable_vsnprintf */
1133 /* declare our portable routines under names snprintf and vsnprintf */
1134 #define portable_snprintf snprintf
1135 #if !defined(NEED_SNPRINTF_ONLY)
1136 #define portable_vsnprintf vsnprintf
1140 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1141 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...);
1142 #if !defined(NEED_SNPRINTF_ONLY)
1143 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap);
1149 static char credits[] = "\n\
1150 @(#)snprintf.c, v2.2: Mark Martinec, <mark.martinec@ijs.si>\n\
1151 @(#)snprintf.c, v2.2: Copyright 1999, Mark Martinec. Frontier Artistic License applies.\n\
1152 @(#)snprintf.c, v2.2: http://www.ijs.si/software/snprintf/\n";
1154 #if defined(NEED_ASPRINTF)
1155 int asprintf(char **ptr, const char *fmt, /*args*/ ...) {
1161 va_start(ap, fmt); /* measure the required size */
1162 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1164 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1165 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1166 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1170 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1172 assert(str_l2 == str_l);
1178 #if defined(NEED_VASPRINTF)
1179 int vasprintf(char **ptr, const char *fmt, va_list ap) {
1185 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1186 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1189 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1190 *ptr = (char *) malloc(str_m = (size_t)str_l + 1);
1191 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1193 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1194 assert(str_l2 == str_l);
1200 #if defined(NEED_ASNPRINTF)
1201 int asnprintf (char **ptr, size_t str_m, const char *fmt, /*args*/ ...) {
1206 va_start(ap, fmt); /* measure the required size */
1207 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap);
1209 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1210 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1211 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1212 if (str_m == 0) { /* not interested in resulting string, just return size */
1214 *ptr = (char *) malloc(str_m);
1215 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1219 str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1221 assert(str_l2 == str_l);
1228 #if defined(NEED_VASNPRINTF)
1229 int vasnprintf (char **ptr, size_t str_m, const char *fmt, va_list ap) {
1234 va_copy(ap2, ap); /* don't consume the original ap, we'll need it again */
1235 str_l = portable_vsnprintf(NULL, (size_t)0, fmt, ap2);/*get required size*/
1238 assert(str_l >= 0); /* possible integer overflow if str_m > INT_MAX */
1239 if ((size_t)str_l + 1 < str_m) str_m = (size_t)str_l + 1; /* truncate */
1240 /* if str_m is 0, no buffer is allocated, just set *ptr to NULL */
1241 if (str_m == 0) { /* not interested in resulting string, just return size */
1243 *ptr = (char *) malloc(str_m);
1244 if (*ptr == NULL) { errno = ENOMEM; str_l = -1; }
1246 int str_l2 = portable_vsnprintf(*ptr, str_m, fmt, ap);
1247 assert(str_l2 == str_l);
1255 * If the system does have snprintf and the portable routine is not
1256 * specifically required, this module produces no code for snprintf/vsnprintf.
1258 #if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
1260 #if !defined(NEED_SNPRINTF_ONLY)
1261 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1266 str_l = portable_vsnprintf(str, str_m, fmt, ap);
1272 #if defined(NEED_SNPRINTF_ONLY)
1273 int portable_snprintf(char *str, size_t str_m, const char *fmt, /*args*/ ...) {
1275 int portable_vsnprintf(char *str, size_t str_m, const char *fmt, va_list ap) {
1278 #if defined(NEED_SNPRINTF_ONLY)
1282 const char *p = fmt;
1284 /* In contrast with POSIX, the ISO C99 now says
1285 * that str can be NULL and str_m can be 0.
1286 * This is more useful than the old: if (str_m < 1) return -1; */
1288 #if defined(NEED_SNPRINTF_ONLY)
1294 /* if (str_l < str_m) str[str_l++] = *p++; -- this would be sufficient */
1295 /* but the following code achieves better performance for cases
1296 * where format string is long and contains few conversions */
1297 const char *q = strchr(p+1,'%');
1298 size_t n = !q ? strlen(p) : (q-p);
1299 if (str_l < str_m) {
1300 size_t avail = str_m-str_l;
1301 fast_memcpy(str+str_l, p, (n>avail?avail:n));
1305 const char *starting_p;
1306 size_t min_field_width = 0, precision = 0;
1307 int zero_padding = 0, precision_specified = 0, justify_left = 0;
1308 int alternate_form = 0, force_sign = 0;
1309 int space_for_positive = 1; /* If both the ' ' and '+' flags appear,
1310 the ' ' flag should be ignored. */
1311 char length_modifier = '\0'; /* allowed values: \0, h, l, L */
1312 char tmp[32];/* temporary buffer for simple numeric->string conversion */
1314 const char *str_arg; /* string address in case of string argument */
1315 size_t str_arg_l; /* natural field width of arg without padding
1317 unsigned char uchar_arg;
1318 /* unsigned char argument value - only defined for c conversion.
1319 N.B. standard explicitly states the char argument for
1320 the c conversion is unsigned */
1322 size_t number_of_zeros_to_pad = 0;
1323 /* number of zeros to be inserted for numeric conversions
1324 as required by the precision or minimal field width */
1326 size_t zero_padding_insertion_ind = 0;
1327 /* index into tmp where zero padding is to be inserted */
1329 char fmt_spec = '\0';
1330 /* current conversion specifier character */
1332 str_arg = credits;/* just to make compiler happy (defined but not used)*/
1334 starting_p = p; p++; /* skip '%' */
1336 while (*p == '0' || *p == '-' || *p == '+' ||
1337 *p == ' ' || *p == '#' || *p == '\'') {
1339 case '0': zero_padding = 1; break;
1340 case '-': justify_left = 1; break;
1341 case '+': force_sign = 1; space_for_positive = 0; break;
1342 case ' ': force_sign = 1;
1343 /* If both the ' ' and '+' flags appear, the ' ' flag should be ignored */
1344 #ifdef PERL_COMPATIBLE
1345 /* ... but in Perl the last of ' ' and '+' applies */
1346 space_for_positive = 1;
1349 case '#': alternate_form = 1; break;
1354 /* If the '0' and '-' flags both appear, the '0' flag should be ignored. */
1356 /* parse field width */
1359 p++; j = va_arg(ap, int);
1360 if (j >= 0) min_field_width = j;
1361 else { min_field_width = -j; justify_left = 1; }
1362 } else if (isdigit((int)(*p))) {
1363 /* size_t could be wider than unsigned int;
1364 make sure we treat argument like common implementations do */
1365 unsigned int uj = *p++ - '0';
1366 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1367 min_field_width = uj;
1369 /* parse precision */
1371 p++; precision_specified = 1;
1373 int j = va_arg(ap, int);
1375 if (j >= 0) precision = j;
1377 precision_specified = 0; precision = 0;
1379 * Solaris 2.6 man page claims that in this case the precision
1380 * should be set to 0. Digital Unix 4.0, HPUX 10 and BSD man page
1381 * claim that this case should be treated as unspecified precision,
1382 * which is what we do here.
1385 } else if (isdigit((int)(*p))) {
1386 /* size_t could be wider than unsigned int;
1387 make sure we treat argument like common implementations do */
1388 unsigned int uj = *p++ - '0';
1389 while (isdigit((int)(*p))) uj = 10*uj + (unsigned int)(*p++ - '0');
1393 /* parse 'h', 'l' and 'll' length modifiers */
1394 if (*p == 'h' || *p == 'l') {
1395 length_modifier = *p; p++;
1396 if (length_modifier == 'l' && *p == 'l') { /* double l = long long */
1397 #ifdef SNPRINTF_LONGLONG_SUPPORT
1398 length_modifier = '2'; /* double l encoded as '2' */
1400 length_modifier = 'l'; /* treat it as a single 'l' */
1406 /* common synonyms: */
1408 case 'i': fmt_spec = 'd'; break;
1409 case 'D': fmt_spec = 'd'; length_modifier = 'l'; break;
1410 case 'U': fmt_spec = 'u'; length_modifier = 'l'; break;
1411 case 'O': fmt_spec = 'o'; length_modifier = 'l'; break;
1414 /* get parameter value, do initial processing */
1416 case '%': /* % behaves similar to 's' regarding flags and field widths */
1417 case 'c': /* c behaves similar to 's' regarding flags and field widths */
1419 length_modifier = '\0'; /* wint_t and wchar_t not supported */
1420 /* the result of zero padding flag with non-numeric conversion specifier*/
1421 /* is undefined. Solaris and HPUX 10 does zero padding in this case, */
1422 /* Digital Unix and Linux does not. */
1423 #if !defined(SOLARIS_COMPATIBLE) && !defined(HPUX_COMPATIBLE)
1424 zero_padding = 0; /* turn zero padding off for string conversions */
1431 int j = va_arg(ap, int);
1432 uchar_arg = (unsigned char) j; /* standard demands unsigned char */
1433 str_arg = (const char *) &uchar_arg;
1437 str_arg = va_arg(ap, const char *);
1438 if (!str_arg) str_arg_l = 0;
1439 /* make sure not to address string beyond the specified precision !!! */
1440 else if (!precision_specified) str_arg_l = strlen(str_arg);
1441 /* truncate string if necessary as requested by precision */
1442 else if (precision == 0) str_arg_l = 0;
1444 /* memchr on HP does not like n > 2^31 !!! */
1445 const char *q = memchr(str_arg, '\0',
1446 precision <= 0x7fffffff ? precision : 0x7fffffff);
1447 str_arg_l = !q ? precision : (q-str_arg);
1453 case 'd': case 'u': case 'o': case 'x': case 'X': case 'p': {
1454 /* NOTE: the u, o, x, X and p conversion specifiers imply
1455 the value is unsigned; d implies a signed value */
1458 /* 0 if numeric argument is zero (or if pointer is NULL for 'p'),
1459 +1 if greater than zero (or nonzero for unsigned arguments),
1460 -1 if negative (unsigned argument is never negative) */
1462 int int_arg = 0; unsigned int uint_arg = 0;
1463 /* only defined for length modifier h, or for no length modifiers */
1465 long int long_arg = 0; unsigned long int ulong_arg = 0;
1466 /* only defined for length modifier l */
1468 void *ptr_arg = NULL;
1469 /* pointer argument value -only defined for p conversion */
1471 #ifdef SNPRINTF_LONGLONG_SUPPORT
1472 long long int long_long_arg = 0;
1473 unsigned long long int ulong_long_arg = 0;
1474 /* only defined for length modifier ll */
1476 if (fmt_spec == 'p') {
1477 /* HPUX 10: An l, h, ll or L before any other conversion character
1478 * (other than d, i, u, o, x, or X) is ignored.
1480 * not specified, but seems to behave as HPUX does.
1481 * Solaris: If an h, l, or L appears before any other conversion
1482 * specifier (other than d, i, u, o, x, or X), the behavior
1483 * is undefined. (Actually %hp converts only 16-bits of address
1484 * and %llp treats address as 64-bit data which is incompatible
1485 * with (void *) argument on a 32-bit system).
1487 #ifdef SOLARIS_COMPATIBLE
1488 # ifdef SOLARIS_BUG_COMPATIBLE
1489 /* keep length modifiers even if it represents 'll' */
1491 if (length_modifier == '2') length_modifier = '\0';
1494 length_modifier = '\0';
1496 ptr_arg = va_arg(ap, void *);
1497 if (ptr_arg != NULL) arg_sign = 1;
1498 } else if (fmt_spec == 'd') { /* signed */
1499 switch (length_modifier) {
1502 /* It is non-portable to specify a second argument of char or short
1503 * to va_arg, because arguments seen by the called function
1504 * are not char or short. C converts char and short arguments
1505 * to int before passing them to a function.
1507 int_arg = va_arg(ap, int);
1508 if (int_arg > 0) arg_sign = 1;
1509 else if (int_arg < 0) arg_sign = -1;
1512 long_arg = va_arg(ap, long int);
1513 if (long_arg > 0) arg_sign = 1;
1514 else if (long_arg < 0) arg_sign = -1;
1516 #ifdef SNPRINTF_LONGLONG_SUPPORT
1518 long_long_arg = va_arg(ap, long long int);
1519 if (long_long_arg > 0) arg_sign = 1;
1520 else if (long_long_arg < 0) arg_sign = -1;
1524 } else { /* unsigned */
1525 switch (length_modifier) {
1528 uint_arg = va_arg(ap, unsigned int);
1529 if (uint_arg) arg_sign = 1;
1532 ulong_arg = va_arg(ap, unsigned long int);
1533 if (ulong_arg) arg_sign = 1;
1535 #ifdef SNPRINTF_LONGLONG_SUPPORT
1537 ulong_long_arg = va_arg(ap, unsigned long long int);
1538 if (ulong_long_arg) arg_sign = 1;
1543 str_arg = tmp; str_arg_l = 0;
1545 * For d, i, u, o, x, and X conversions, if precision is specified,
1546 * the '0' flag should be ignored. This is so with Solaris 2.6,
1547 * Digital UNIX 4.0, HPUX 10, Linux, FreeBSD, NetBSD; but not with Perl.
1549 #ifndef PERL_COMPATIBLE
1550 if (precision_specified) zero_padding = 0;
1552 if (fmt_spec == 'd') {
1553 if (force_sign && arg_sign >= 0)
1554 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1555 /* leave negative numbers for sprintf to handle,
1556 to avoid handling tricky cases like (short int)(-32768) */
1557 #ifdef LINUX_COMPATIBLE
1558 } else if (fmt_spec == 'p' && force_sign && arg_sign > 0) {
1559 tmp[str_arg_l++] = space_for_positive ? ' ' : '+';
1561 } else if (alternate_form) {
1562 if (arg_sign != 0 && (fmt_spec == 'x' || fmt_spec == 'X') )
1563 { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = fmt_spec; }
1564 /* alternate form should have no effect for p conversion, but ... */
1565 #ifdef HPUX_COMPATIBLE
1566 else if (fmt_spec == 'p'
1567 /* HPUX 10: for an alternate form of p conversion,
1568 * a nonzero result is prefixed by 0x. */
1569 #ifndef HPUX_BUG_COMPATIBLE
1570 /* Actually it uses 0x prefix even for a zero value. */
1573 ) { tmp[str_arg_l++] = '0'; tmp[str_arg_l++] = 'x'; }
1576 zero_padding_insertion_ind = str_arg_l;
1577 if (!precision_specified) precision = 1; /* default precision is 1 */
1578 if (precision == 0 && arg_sign == 0
1579 #if defined(HPUX_BUG_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1581 /* HPUX 10 man page claims: With conversion character p the result of
1582 * converting a zero value with a precision of zero is a null string.
1583 * Actually HP returns all zeroes, and Linux returns "(nil)". */
1586 /* converted to null string */
1587 /* When zero value is formatted with an explicit precision 0,
1588 the resulting formatted string is empty (d, i, u, o, x, X, p). */
1590 char f[5]; int f_l = 0;
1591 f[f_l++] = '%'; /* construct a simple format string for sprintf */
1592 if (!length_modifier) { }
1593 else if (length_modifier=='2') { f[f_l++] = 'l'; f[f_l++] = 'l'; }
1594 else f[f_l++] = length_modifier;
1595 f[f_l++] = fmt_spec; f[f_l++] = '\0';
1596 if (fmt_spec == 'p') str_arg_l += sprintf(tmp+str_arg_l, f, ptr_arg);
1597 else if (fmt_spec == 'd') { /* signed */
1598 switch (length_modifier) {
1600 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, int_arg); break;
1601 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, long_arg); break;
1602 #ifdef SNPRINTF_LONGLONG_SUPPORT
1603 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,long_long_arg); break;
1606 } else { /* unsigned */
1607 switch (length_modifier) {
1609 case 'h': str_arg_l+=sprintf(tmp+str_arg_l, f, uint_arg); break;
1610 case 'l': str_arg_l+=sprintf(tmp+str_arg_l, f, ulong_arg); break;
1611 #ifdef SNPRINTF_LONGLONG_SUPPORT
1612 case '2': str_arg_l+=sprintf(tmp+str_arg_l,f,ulong_long_arg);break;
1616 /* include the optional minus sign and possible "0x"
1617 in the region before the zero padding insertion point */
1618 if (zero_padding_insertion_ind < str_arg_l &&
1619 tmp[zero_padding_insertion_ind] == '-') {
1620 zero_padding_insertion_ind++;
1622 if (zero_padding_insertion_ind+1 < str_arg_l &&
1623 tmp[zero_padding_insertion_ind] == '0' &&
1624 (tmp[zero_padding_insertion_ind+1] == 'x' ||
1625 tmp[zero_padding_insertion_ind+1] == 'X') ) {
1626 zero_padding_insertion_ind += 2;
1629 { size_t num_of_digits = str_arg_l - zero_padding_insertion_ind;
1630 if (alternate_form && fmt_spec == 'o'
1631 #ifdef HPUX_COMPATIBLE /* ("%#.o",0) -> "" */
1634 #ifdef DIGITAL_UNIX_BUG_COMPATIBLE /* ("%#o",0) -> "00" */
1636 /* unless zero is already the first character */
1637 && !(zero_padding_insertion_ind < str_arg_l
1638 && tmp[zero_padding_insertion_ind] == '0')
1640 ) { /* assure leading zero for alternate-form octal numbers */
1641 if (!precision_specified || precision < num_of_digits+1) {
1642 /* precision is increased to force the first character to be zero,
1643 except if a zero value is formatted with an explicit precision
1645 precision = num_of_digits+1; precision_specified = 1;
1648 /* zero padding to specified precision? */
1649 if (num_of_digits < precision)
1650 number_of_zeros_to_pad = precision - num_of_digits;
1652 /* zero padding to specified minimal field width? */
1653 if (!justify_left && zero_padding) {
1654 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1655 if (n > 0) number_of_zeros_to_pad += n;
1659 default: /* unrecognized conversion specifier, keep format string as-is*/
1660 zero_padding = 0; /* turn zero padding off for non-numeric convers. */
1661 #ifndef DIGITAL_UNIX_COMPATIBLE
1662 justify_left = 1; min_field_width = 0; /* reset flags */
1664 #if defined(PERL_COMPATIBLE) || defined(LINUX_COMPATIBLE)
1665 /* keep the entire format string unchanged */
1666 str_arg = starting_p; str_arg_l = p - starting_p;
1667 /* well, not exactly so for Linux, which does something inbetween,
1668 * and I don't feel an urge to imitate it: "%+++++hy" -> "%+y" */
1670 /* discard the unrecognized conversion, just keep *
1671 * the unrecognized conversion character */
1672 str_arg = p; str_arg_l = 0;
1674 if (*p) str_arg_l++; /* include invalid conversion specifier unchanged
1675 if not at end-of-string */
1678 if (*p) p++; /* step over the just processed conversion specifier */
1679 /* insert padding to the left as requested by min_field_width;
1680 this does not include the zero padding in case of numerical conversions*/
1681 if (!justify_left) { /* left padding with blank or zero */
1682 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1684 if (str_l < str_m) {
1685 size_t avail = str_m-str_l;
1686 fast_memset(str+str_l, (zero_padding?'0':' '), (n>avail?avail:n));
1691 /* zero padding as requested by the precision or by the minimal field width
1692 * for numeric conversions required? */
1693 if (number_of_zeros_to_pad <= 0) {
1694 /* will not copy first part of numeric right now, *
1695 * force it to be copied later in its entirety */
1696 zero_padding_insertion_ind = 0;
1698 /* insert first part of numerics (sign or '0x') before zero padding */
1699 int n = zero_padding_insertion_ind;
1701 if (str_l < str_m) {
1702 size_t avail = str_m-str_l;
1703 fast_memcpy(str+str_l, str_arg, (n>avail?avail:n));
1707 /* insert zero padding as requested by the precision or min field width */
1708 n = number_of_zeros_to_pad;
1710 if (str_l < str_m) {
1711 size_t avail = str_m-str_l;
1712 fast_memset(str+str_l, '0', (n>avail?avail:n));
1717 /* insert formatted string
1718 * (or as-is conversion specifier for unknown conversions) */
1719 { int n = str_arg_l - zero_padding_insertion_ind;
1721 if (str_l < str_m) {
1722 size_t avail = str_m-str_l;
1723 fast_memcpy(str+str_l, str_arg+zero_padding_insertion_ind,
1729 /* insert right padding */
1730 if (justify_left) { /* right blank padding to the field width */
1731 int n = min_field_width - (str_arg_l+number_of_zeros_to_pad);
1733 if (str_l < str_m) {
1734 size_t avail = str_m-str_l;
1735 fast_memset(str+str_l, ' ', (n>avail?avail:n));
1742 #if defined(NEED_SNPRINTF_ONLY)
1745 if (str_m > 0) { /* make sure the string is null-terminated
1746 even at the expense of overwriting the last character
1747 (shouldn't happen, but just in case) */
1748 str[str_l <= str_m-1 ? str_l : str_m-1] = '\0';
1750 /* Return the number of characters formatted (excluding trailing null
1751 * character), that is, the number of characters that would have been
1752 * written to the buffer if it were large enough.
1754 * The value of str_l should be returned, but str_l is of unsigned type
1755 * size_t, and snprintf is int, possibly leading to an undetected
1756 * integer overflow, resulting in a negative return value, which is illegal.
1757 * Both XSH5 and ISO C99 (at least the draft) are silent on this issue.
1758 * Should errno be set to EOVERFLOW and EOF returned in this case???
1763 #endif /* __OS2__ */