From 9d8085074991d5c0a42d6fc96a2d1a3ee918aad1 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 08:17:24 +0200
Subject: Adding upstream version 5.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 lib/sh/mbschr.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 lib/sh/mbschr.c

(limited to 'lib/sh/mbschr.c')

diff --git a/lib/sh/mbschr.c b/lib/sh/mbschr.c
new file mode 100644
index 0000000..639962d
--- /dev/null
+++ b/lib/sh/mbschr.c
@@ -0,0 +1,91 @@
+/* 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"
+
+extern int locale_mb_cur_max;
+extern int locale_utf8locale;
+
+#undef mbschr
+
+extern char *utf8_mbschr (const char *, int);	/* XXX */
+
+/* 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;
+
+  if (locale_utf8locale && c < 0x80)
+    return (utf8_mbschr (s, c));		/* XXX */
+
+  /* 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' && locale_mb_cur_max > 1)
+    {
+      pos = (char *)s;
+      memset (&state, '\0', sizeof(mbstate_t));
+      strlength = strlen (s);
+
+      while (strlength > 0)
+	{
+	  if (is_basic (*pos))
+	    mblength = 1;
+	  else
+	    {
+	      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));
+}
-- 
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