1 files changed, 78 insertions, 0 deletions
diff --git a/lib/sh/mbschr.c b/lib/sh/mbschr.c
new file mode 100644
index 0000000..5143d64
--- /dev/null
+++ b/lib/sh/mbschr.c
@@ -0,0 +1,78 @@
+/* mbschr.c - strchr(3) that handles multibyte characters. */
+
+/* Copyright (C) 2002 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+#endif
+
+#include "bashansi.h"
+#include "shmbutil.h"
+
+#undef mbschr
+
+/* In some locales, the non-first byte of some multibyte characters have
+   the same value as some ascii character.  Faced with these strings, a
+   legacy strchr() might return the wrong value. */
+
+char *
+#if defined (PROTOTYPES)
+mbschr (const char *s, int c)
+#else
+mbschr (s, c)
+     const char *s;
+     int c;
+#endif
+{
+#if HANDLE_MULTIBYTE
+  char *pos;
+  mbstate_t state;
+  size_t strlength, mblength;
+
+  /* The locale encodings with said weird property are BIG5, BIG5-HKSCS,
+     GBK, GB18030, SHIFT_JIS, and JOHAB.  They exhibit the problem only
+     when c >= 0x30.  We can therefore use the faster bytewise search if
+     c <= 0x30. */
+  if ((unsigned char)c >= '0' && MB_CUR_MAX > 1)
+    {
+      pos = (char *)s;
+      memset (&state, '\0', sizeof(mbstate_t));
+      strlength = strlen (s);
+
+      while (strlength > 0)
+	{
+	  mblength = mbrlen (pos, strlength, &state);
+	  if (mblength == (size_t)-2 || mblength == (size_t)-1 || mblength == (size_t)0)
+	    mblength = 1;
+
+	  if (mblength == 1 && c == (unsigned char)*pos)
+	    return pos;
+
+	  strlength -= mblength;
+	  pos += mblength;
+	}
+
+      return ((char *)NULL);
+    }
+  else
+#endif
+  return (strchr (s, c));
+}