From 809b538c774eb4689227b7b4fde2ff12f7b8a54a Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Mon, 5 Feb 2007 01:07:28 +0000
Subject: [PATCH] New module 'mbsrchr'.

---
 lib/mbsrchr.c   | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 m4/mbsrchr.m4   | 16 ++++++++++++++++
 modules/mbsrchr | 28 ++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+)
 create mode 100644 lib/mbsrchr.c
 create mode 100644 m4/mbsrchr.m4
 create mode 100644 modules/mbsrchr

diff --git a/lib/mbsrchr.c b/lib/mbsrchr.c
new file mode 100644
index 000000000..f3b280845
--- /dev/null
+++ b/lib/mbsrchr.c
@@ -0,0 +1,56 @@
+/* Searching a string for the last occurrence of a character.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 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);
+}
diff --git a/m4/mbsrchr.m4 b/m4/mbsrchr.m4
new file mode 100644
index 000000000..79d46dc24
--- /dev/null
+++ b/m4/mbsrchr.m4
@@ -0,0 +1,16 @@
+# 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])
+  :
+])
diff --git a/modules/mbsrchr b/modules/mbsrchr
new file mode 100644
index 000000000..2ff7b3885
--- /dev/null
+++ b/modules/mbsrchr
@@ -0,0 +1,28 @@
+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
+
-- 
2.11.0