Bash-4.2 distribution sources and documentation

lib/sh/shmbchar.c

@@ -0,0 +1,92 @@
+/* Copyright (C) 2001, 2006, 2009, 2010 Free Software Foundation, Inc.
+
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+
+#include <config.h>
+
+#if defined (HANDLE_MULTIBYTE)
+#include <stdlib.h>
+#include <limits.h>
+
+#include <shmbutil.h>
+#include <shmbchar.h>
+
+#if IS_BASIC_ASCII
+
+/* Bit table of characters in the ISO C "basic character set".  */
+const unsigned int is_basic_table [UCHAR_MAX / 32 + 1] =
+{
+  0x00001a00,           /* '\t' '\v' '\f' */
+  0xffffffef,           /* ' '...'#' '%'...'?' */
+  0xfffffffe,           /* 'A'...'Z' '[' '\\' ']' '^' '_' */
+  0x7ffffffe            /* 'a'...'z' '{' '|' '}' '~' */
+  /* The remaining bits are 0.  */
+};
+
+#endif /* IS_BASIC_ASCII */
+
+size_t
+mbstrlen (s)
+     const char *s;
+{
+  size_t clen, nc;
+  mbstate_t mbs = { 0 }, mbsbak = { 0 };
+  int f;
+
+  nc = 0;
+  while (*s && (clen = (f = is_basic (*s)) ? 1 : mbrlen(s, MB_CUR_MAX, &mbs)) != 0)
+    {
+      if (MB_INVALIDCH(clen))
+	{
+	  clen = 1;	/* assume single byte */
+	  mbs = mbsbak;
+	}
+
+      if (f == 0)
+	mbsbak = mbs;
+
+      s += clen;
+      nc++;
+    }
+  return nc;
+}
+
+/* Return pointer to first multibyte char in S, or NULL if none. */
+char *
+mbsmbchar (s)
+     const char *s;
+{
+  char *t;
+  size_t clen;
+  mbstate_t mbs = { 0 };
+
+  for (t = (char *)s; *t; t++)
+    {
+      if (is_basic (*t))
+	continue;
+
+      clen = mbrlen (t, MB_CUR_MAX, &mbs);
+
+      if (clen == 0)
+        return 0;
+      if (MB_INVALIDCH(clen))
+	continue;
+
+      if (clen > 1)
+	return t;
+    }
+  return 0;
+}
+#endif