[PATCH:xev 2/2] Use strncasecmp if available, instead of a tolower loop & strncmp

[Alan Coopersmith]

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 configure.ac |    3 +++
 xev.c        |   12 +++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 0af7b2d..6016d62 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,7 @@ AC_INIT([xev], [1.2.0],
         [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg], [xev])
 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_HEADERS([config.h])
+AC_USE_SYSTEM_EXTENSIONS
 
 # Initialize Automake
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
@@ -37,6 +38,8 @@ m4_ifndef([XORG_MACROS_VERSION],
 XORG_MACROS_VERSION(1.8)
 XORG_DEFAULT_OPTIONS
 
+AC_CHECK_FUNCS([strncasecmp])
+
 # Checks for pkg-config packages
 PKG_CHECK_MODULES(XEV, [xrandr >= 1.2 x11 xproto >= 7.0.17])
 
diff --git a/xev.c b/xev.c
index 34a46aa..298c5c1 100644
--- a/xev.c
+++ b/xev.c
@@ -32,6 +32,9 @@ from the X Consortium.
  * Author:  Jim Fulton, MIT X Consortium
  */
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
@@ -907,16 +910,19 @@ static int
 parse_backing_store (char *s)
 {
     size_t len = strlen (s);
+#ifndef HAVE_STRNCASECMP
     char *cp;
 
     for (cp = s; *cp; cp++) {
 	if (isascii (*cp) && isupper (*cp))
 	    *cp = tolower (*cp);
     }
+#define strncasecmp strncmp
+#endif
 
-    if (strncmp (s, "notuseful", len) == 0) return (NotUseful);
-    if (strncmp (s, "whenmapped", len) == 0) return (WhenMapped);
-    if (strncmp (s, "always", len) == 0) return (Always);
+    if (strncasecmp (s, "notuseful", len) == 0) return (NotUseful);
+    if (strncasecmp (s, "whenmapped", len) == 0) return (WhenMapped);
+    if (strncasecmp (s, "always", len) == 0) return (Always);
 
     usage ();
 }
-- 
1.7.9.2