[Bug-gnulib] strchrnul patch to assume C89 or later

[Paul Eggert]

This one is a bit unusual, in that while fixing the signature I noted
a related bug.  Here is a patch:

2003-09-10  Paul Eggert  <address@hidden>

        * strchrnul.c (strchrnul): Define with a prototype.
        Fix bug: c_in was not converted to unsigned char before searching.
        * strchrnul.m4 (gl_PREREQ_STRCHRNUL): Don't check for string.h.

Index: lib/strchrnul.c
===================================================================
RCS file: /cvsroot/gnulib/gnulib/lib/strchrnul.c,v
retrieving revision 1.1
diff -p -u -r1.1 strchrnul.c
--- lib/strchrnul.c     10 Jun 2003 12:13:32 -0000      1.1
+++ lib/strchrnul.c     10 Sep 2003 07:07:01 -0000
@@ -20,12 +20,11 @@
 
 /* Find the first occurrence of C in S or the final NUL byte.  */
 char *
-strchrnul (s, c_in)
-     const char *s;
-     int c_in;
+strchrnul (const char *s, int c_in)
 {
-  while (*s && (*s != c_in))
+  unsigned char c = c_in;
+  while (*s && (*s != c))
     s++;
 
-  return (char*) s;
+  return (char *) s;
 }
Index: m4/strchrnul.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/strchrnul.m4,v
retrieving revision 1.1
diff -p -u -r1.1 strchrnul.m4
--- m4/strchrnul.m4     10 Jun 2003 12:13:32 -0000      1.1
+++ m4/strchrnul.m4     10 Sep 2003 07:07:01 -0000
@@ -1,4 +1,4 @@
-# strchrnul.m4 serial 1
+# strchrnul.m4 serial 2
 dnl Copyright (C) 2003 Free Software Foundation, Inc.
 dnl This file is free software, distributed under the terms of the GNU
 dnl General Public License.  As a special exception to the GNU General
@@ -18,6 +18,4 @@ AC_DEFUN([gl_FUNC_STRCHRNUL],
 ])
 
 # Prerequisites of lib/strchrnul.c.
-AC_DEFUN([gl_PREREQ_STRCHRNUL], [
-  AC_CHECK_HEADERS_ONCE(string.h)
-])
+AC_DEFUN([gl_PREREQ_STRCHRNUL], [:])