* lib/strspn.c: New.

[bison.git] / lib / strspn.c

diff --git a/lib/strspn.c b/lib/strspn.c
new file mode 100644 (file)
index 0000000..399d540
--- /dev/null
+++ b/lib/strspn.c
@@ -0,0 +1,59 @@
+/* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
+
+   NOTE: The canonical source of this file is maintained with the GNU
+   C Library.  Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License
+   as published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place -
+   Suite 330, Boston, MA 02111-1307, USA.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if defined _LIBC || HAVE_STRING_H
+# include <string.h>
+#else
+# include <strings.h>
+# ifndef strchr
+#  define strchr index
+# endif
+#endif
+
+#undef strspn
+
+/* Return the length of the maximum initial segment
+   of S which contains only characters in ACCEPT.  */
+size_t
+strspn (s, accept)
+     const char *s;
+     const char *accept;
+{
+  const char *p;
+  const char *a;
+  size_t count = 0;
+
+  for (p = s; *p != '\0'; ++p)
+    {
+      for (a = accept; *a != '\0'; ++a)
+       if (*p == *a)
+         break;
+      if (*a == '\0')
+       return count;
+      else
+       ++count;
+    }
+
+  return count;
+}