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annotate lib/memcoll.c @ 7302:8a1a9361108c

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* _fpending.c: Include <config.h> unconditionally, since we no longer worry about uses that don't define HAVE_CONFIG_H. * acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c: * basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c: * canonicalize.c, chdir-long.c, chdir-safer.c, chown.c: * cloexec.c, close-stream.c, closeout.c, creat-safer.c: * cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c: * dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c: * exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c: * file-type.c, fileblocks.c, filemode.c, filenamecat.c: * fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c: * ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c: * getcwd.c, getdate.y, getdomainname.c, getgroups.c: * gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c: * getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c: * gettime.c, gettimeofday.c, getugroups.c, getusershell.c: * glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c: * human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c: * isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c: * malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c: * memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c: * mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c: * mountlist.c, nanosleep.c, obstack.c, open-safer.c: * openat-die.c, openat.c, pagealign_alloc.c, physmem.c: * pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c: * quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c: * realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c: * same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c: * sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c: * stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c: * strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c: * timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c: * utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c: * xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c: * xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c: * xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c: Likewise.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 13 Sep 2006 22:38:14 +0000
parents bf3b976f47a7
children bbbbbf4cd1c5
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1 /* Locale-specific memory comparison.
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2
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3 Copyright (C) 1999, 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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a48fb0e98c8c *** empty log message ***
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 /* Contributed by Paul Eggert <eggert@twinsun.com>. */
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20
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21 #include <config.h>
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22
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23 #include "memcoll.h"
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24
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25 #include <errno.h>
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26 #include <string.h>
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27
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28 /* Compare S1 (with length S1LEN) and S2 (with length S2LEN) according
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29 to the LC_COLLATE locale. S1 and S2 do not overlap, and are not
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30 adjacent. Perhaps temporarily modify the bytes after S1 and S2,
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31 but restore their original contents before returning. Set errno to an
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32 error number if there is an error, and to zero otherwise. */
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33 int
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34 memcoll (char *s1, size_t s1len, char *s2, size_t s2len)
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35 {
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36 int diff;
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37
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38 #if HAVE_STRCOLL
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39
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40 /* strcoll is slow on many platforms, so check for the common case
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41 where the arguments are bytewise equal. Otherwise, walk through
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42 the buffers using strcoll on each substring. */
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43
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44 if (s1len == s2len && memcmp (s1, s2, s1len) == 0)
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45 {
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46 errno = 0;
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47 diff = 0;
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48 }
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49 else
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50 {
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51 char n1 = s1[s1len];
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52 char n2 = s2[s2len];
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53
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54 s1[s1len++] = '\0';
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55 s2[s2len++] = '\0';
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56
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57 while (! (errno = 0, (diff = strcoll (s1, s2)) || errno))
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58 {
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59 /* strcoll found no difference, but perhaps it was fooled by NUL
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60 characters in the data. Work around this problem by advancing
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61 past the NUL chars. */
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62 size_t size1 = strlen (s1) + 1;
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63 size_t size2 = strlen (s2) + 1;
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64 s1 += size1;
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65 s2 += size2;
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66 s1len -= size1;
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67 s2len -= size2;
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68
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69 if (s1len == 0)
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70 {
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71 if (s2len != 0)
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72 diff = -1;
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73 break;
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74 }
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75 else if (s2len == 0)
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76 {
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77 diff = 1;
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78 break;
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79 }
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80 }
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81
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82 s1[s1len - 1] = n1;
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83 s2[s2len - 1] = n2;
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84 }
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85
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86 #else
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87
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88 diff = memcmp (s1, s2, s1len < s2len ? s1len : s2len);
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89 if (! diff)
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90 diff = s1len < s2len ? -1 : s1len != s2len;
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91 errno = 0;
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92
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93 #endif
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94
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95 return diff;
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96 }