mbsrchr() is the analogon of strrchr() that works with characters strings
(in other words, with strings also in multibyte locales).
2007-02-04 Bruno Haible <[EMAIL PROTECTED]>
New module mbsrchr.
* modules/mbsrchr: New file.
* lib/mbsrchr.c: New file.
* lib/string_.h (strrchr): Add a conditional link warning.
(mbsrchr): New declaration.
* m4/mbsrchr.m4: New file.
* m4/string_h.m4 (gl_STRING_MODULE_INDICATOR_DEFAULTS): Initialize
GNULIB_MBSRCHR.
* modules/string (string.h): Also substitute GNULIB_MBSRCHR.
* MODULES.html.sh (Internationalization functions): Add mbsrchr.
========================= modules/mbsrchr =====================================
Description:
mbsrchr() function: search a string for a character, from the end.
Files:
lib/mbsrchr.c
m4/mbsrchr.m4
m4/mbrtowc.m4
Depends-on:
mbuiter
string
configure.ac:
gl_FUNC_MBSRCHR
gl_STRING_MODULE_INDICATOR([mbsrchr])
Makefile.am:
lib_SOURCES += mbsrchr.c
Include:
<string.h>
License:
LGPL
Maintainer:
Bruno Haible
========================== lib/mbsrchr.c ======================================
/* Searching a string for the last occurrence of a character.
Copyright (C) 2007 Free Software Foundation, Inc.
Written by Bruno Haible <[EMAIL PROTECTED]>, 2007.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <config.h>
/* Specification. */
#include <string.h>
#if HAVE_MBRTOWC
# include "mbuiter.h"
#endif
/* Locate the last single-byte character C in the character string STRING,
and return a pointer to it. Return NULL if C is not found in STRING. */
char *
mbsrchr (const char *string, int c)
{
#if HAVE_MBRTOWC
if (MB_CUR_MAX > 1
/* Optimization: We know that ASCII characters < 0x30 don't occur as
part of multibyte characters longer than 1 byte. Hence, if c < 0x30,
the faster unibyte loop can be used. */
&& (unsigned char) c >= 0x30)
{
const char *result = NULL;
mbui_iterator_t iter;
for (mbui_init (iter, string);; mbui_advance (iter))
{
if (mb_len (mbui_cur (iter)) == 1
&& (unsigned char) * mbui_cur_ptr (iter) == (unsigned char) c)
result = mbui_cur_ptr (iter);
if (!mbui_avail (iter))
break;
}
return (char *) result;
}
else
#endif
return strrchr (string, c);
}
=========================== m4/mbsrchr.m4 =====================================
# mbsrchr.m4 serial 1
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_MBSRCHR],
[
gl_PREREQ_MBSRCHR
])
# Prerequisites of lib/mbsrchr.c.
AC_DEFUN([gl_PREREQ_MBSRCHR], [
AC_REQUIRE([gl_FUNC_MBRTOWC])
:
])
===============================================================================
--- MODULES.html.sh 5 Feb 2007 01:01:37 -0000 1.181
+++ MODULES.html.sh 5 Feb 2007 01:12:07 -0000
@@ -2162,6 +2162,7 @@
func_module localcharset
func_module hard-locale
func_module mbschr
+ func_module mbsrchr
func_module mbswidth
func_module memcasecmp
func_module memcoll
--- lib/string_.h 5 Feb 2007 01:01:37 -0000 1.8
+++ lib/string_.h 5 Feb 2007 01:12:07 -0000
@@ -213,6 +213,15 @@
# define strpbrk
strpbrk_is_unportable__use_gnulib_module_strpbrk_for_portability
#endif
+#if defined GNULIB_POSIXCHECK
+/* strrchr() does not work with multibyte strings if the locale encoding is
+ GB18030 and the character to be searched is a digit. */
+# undef strrchr
+# define strrchr(s,c) \
+ (GL_LINK_WARNING ("strrchr cannot work correctly on character strings in
some multibyte locales - use mbsrchr if you care about internationalization"), \
+ strrchr (s, c))
+#endif
+
/* Search the next delimiter (char listed in DELIM) starting at *STRINGP.
If one is found, overwrite it with a NUL, and advance *STRINGP
to point to the next char after it. Otherwise, set *STRINGP to NULL.
@@ -317,6 +326,15 @@
extern char * mbschr (const char *string, int c);
#endif
+#if @GNULIB_MBSRCHR@
+/* Locate the last single-byte character C in the character string STRING,
+ and return a pointer to it. Return NULL if C is not found in STRING.
+ Unlike strrchr(), this function works correctly in multibyte locales with
+ encodings such as GB18030. */
+# define mbsrchr rpl_mbsrchr /* avoid collision with HP-UX function */
+extern char * mbsrchr (const char *string, int c);
+#endif
+
#ifdef __cplusplus
}
--- m4/string_h.m4 5 Feb 2007 01:01:37 -0000 1.6
+++ m4/string_h.m4 5 Feb 2007 01:12:07 -0000
@@ -71,4 +71,5 @@
GNULIB_STRCASESTR=0; AC_SUBST([GNULIB_STRCASESTR])
GNULIB_STRTOK_R=0; AC_SUBST([GNULIB_STRTOK_R])
GNULIB_MBSCHR=0; AC_SUBST([GNULIB_MBSCHR])
+ GNULIB_MBSRCHR=0; AC_SUBST([GNULIB_MBSRCHR])
])
--- modules/string 5 Feb 2007 01:01:37 -0000 1.5
+++ modules/string 5 Feb 2007 01:12:07 -0000
@@ -22,6 +22,7 @@
{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
sed -e 's|@''ABSOLUTE_STRING_H''@|$(ABSOLUTE_STRING_H)|g' \
-e 's|@''GNULIB_MBSCHR''@|$(GNULIB_MBSCHR)|g' \
+ -e 's|@''GNULIB_MBSRCHR''@|$(GNULIB_MBSRCHR)|g' \
-e 's|@''GNULIB_MEMMEM''@|$(GNULIB_MEMMEM)|g' \
-e 's|@''GNULIB_MEMPCPY''@|$(GNULIB_MEMPCPY)|g' \
-e 's|@''GNULIB_MEMRCHR''@|$(GNULIB_MEMRCHR)|g' \
