[gnome-session] gnome-session-check-accelerated: Better kcmdline parsing

[Bastien Nocera <hadess src gnome org>]

commit 97088bda14ca8f1c2fa52326e208593722931689
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Nov 13 14:43:11 2012 +0100

    gnome-session-check-accelerated: Better kcmdline parsing
    
    https://bugzilla.gnome.org/show_bug.cgi?id=688252

 tools/gnome-session-check-accelerated-helper.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/tools/gnome-session-check-accelerated-helper.c b/tools/gnome-session-check-accelerated-helper.c
index cdbaa8e..46112f5 100644
--- a/tools/gnome-session-check-accelerated-helper.c
+++ b/tools/gnome-session-check-accelerated-helper.c
@@ -91,13 +91,17 @@ _print_error (const char *str)
         fprintf (stderr, "gnome-session-is-accelerated: %s\n", str);
 }
 
+#define CMDLINE_UNSET -1
+#define CMDLINE_NON_FALLBACK_FORCED 0
+#define CMDLINE_FALLBACK_FORCED 1
+
 static int
 _parse_kcmdline (void)
 {
         FILE *kcmdline;
         char *line = NULL;
         size_t line_len = 0;
-        int ret = -1;
+        int ret = CMDLINE_UNSET;
 
         kcmdline = fopen("/proc/cmdline", "r");
         if (kcmdline == NULL)
@@ -392,16 +396,17 @@ main (int argc, char **argv)
         int      ret = 1;
 
         kcmdline_parsed = _parse_kcmdline ();
-        if (kcmdline_parsed >= 0) {
-                if (kcmdline_parsed == 0) {
+        if (kcmdline_parsed > CMDLINE_UNSET) {
+                if (kcmdline_parsed == CMDLINE_NON_FALLBACK_FORCED) {
                         _print_error ("Non-fallback mode forced by kernel command line.");
                         ret = 0;
                         goto out;
-                } else if (kcmdline_parsed == 1) {
+                } else if (kcmdline_parsed == CMDLINE_FALLBACK_FORCED) {
                         _print_error ("Fallback mode forced by kernel command line.");
                         goto out;
-                } else
-                        _print_error ("Invalid value for gnome.fallback passed in kernel command line.");
+                } else {
+                        fprintf (stderr, "gnome-session-is-accelerated: Invalid value '%d' for gnome.fallback passed in kernel command line.\n", kcmdline_parsed);
+                }
         }
 
         display = XOpenDisplay (NULL);