strtoumax: fix typo in previous commit.

[gnulib.git] / lib / strncasecmp.c

diff --git a/lib/strncasecmp.c b/lib/strncasecmp.c
index 039be0d..b3b37fc 100644 (file)
--- a/lib/strncasecmp.c
+++ b/lib/strncasecmp.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1998 Free Software Foundation, Inc.
+/* strncasecmp.c -- case insensitive string comparator
+   Copyright (C) 1998-1999, 2005-2007, 2009-2013 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
@@ -11,22 +12,22 @@
    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.  */
+   along with this program; if not, see <http://www.gnu.org/licenses/>.  */
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+/* Specification.  */
+#include <string.h>
 
-#include <sys/types.h>
 #include <ctype.h>
+#include <limits.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.  */
+/* Compare no more than N bytes 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.
+   Note: This function cannot work correctly in multibyte locales.  */
 
 int
 strncasecmp (const char *s1, const char *s2, size_t n)
@@ -40,13 +41,22 @@ strncasecmp (const char *s1, const char *s2, size_t n)
 
   do
     {
-      c1 = TOLOWER (*p1++);
-      c2 = TOLOWER (*p2++);
+      c1 = TOLOWER (*p1);
+      c2 = TOLOWER (*p2);
 
       if (--n == 0 || c1 == '\0')
-       break;
+        break;
+
+      ++p1;
+      ++p2;
     }
   while (c1 == c2);
 
-  return c1 - c2;
+  if (UCHAR_MAX <= INT_MAX)
+    return c1 - c2;
+  else
+    /* On machines where 'char' and 'int' are types of the same size, the
+       difference of two 'unsigned char' values - including the sign bit -
+       doesn't fit in an 'int'.  */
+    return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
 }