Support for strncasemp.

@@ -23,7 +23,7 @@
 
 	* mailbox/attachement.c (message_create_attachment): Use base_name().
 	* mailbox/mbx_mbox.c (mbox_tmpfile): Use base_name().
-	* configure.in: AC_REP_FUNC(vasprintf).
+	* configure.in: AC_REP_FUNC(vasprintf strcasecmp strncasecmp).
 	* include/mailutils/Makefile.am: Add property.h, parse822.h.
 	* lib/vasprintf.c: Taken from libit.
 	* lib/basename.c: Taken from libit/fileutils.

@@ -68,7 +68,7 @@ AC_FUNC_ALLOCA
 AC_FUNC_MMAP
 # FIXME: Provide the GNU one for loosing platforms
 AC_FUNC_FNMATCH
-AC_REPLACE_FUNCS(snprintf strtok_r vasprintf)
+AC_REPLACE_FUNCS(snprintf strtok_r vasprintf strncasecmp strcasecmp)
 AC_CHECK_FUNCS(mkstemp)
 
 dnl Check for libraries

+/* strcasecmp.c -- case insensitive string comparator
+   Copyright (C) 1998, 1999 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 2, 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, 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
+
+#ifdef LENGTH_LIMIT
+# define STRXCASECMP_FUNCTION strncasecmp
+# define STRXCASECMP_DECLARE_N , size_t n
+# define LENGTH_LIMIT_EXPR(Expr) Expr
+#else
+# define STRXCASECMP_FUNCTION strcasecmp
+# define STRXCASECMP_DECLARE_N /* empty */
+# define LENGTH_LIMIT_EXPR(Expr) 0
+#endif
+
+#include <sys/types.h>
+#include <ctype.h>
+
+#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
+
+/* Compare {{no more than N characters of }}strings S1 and S2,
+   ignoring case, returning less than, equal to or
+   greater than zero if S1 is lexicographically less
+   than, equal to or greater than S2.  */
+
+int
+STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_N)
+{
+  register const unsigned char *p1 = (const unsigned char *) s1;
+  register const unsigned char *p2 = (const unsigned char *) s2;
+  unsigned char c1, c2;
+
+  if (p1 == p2 || LENGTH_LIMIT_EXPR (n == 0))
+    return 0;
+
+  do
+    {
+      c1 = TOLOWER (*p1);
+      c2 = TOLOWER (*p2);
+
+      if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
+	break;
+
+      ++p1;
+      ++p2;
+    }
+  while (c1 == c2);
+
+  return c1 - c2;
+}

+#define LENGTH_LIMIT
+#include "strcasecmp.c"