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Diffstat (limited to 'xbacklight.c')
-rw-r--r--xbacklight.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/xbacklight.c b/xbacklight.c
index 214bd32..4f384cc 100644
--- a/xbacklight.c
+++ b/xbacklight.c
@@ -38,7 +38,7 @@ static char *program_name;
static xcb_atom_t backlight, backlight_new, backlight_legacy;
static void
-usage (void)
+usage (int exitcode)
{
fprintf(stderr, "usage: %s [options]\n%s", program_name,
" where options are:\n"
@@ -50,7 +50,14 @@ usage (void)
" -get\n"
" -time <fade time in milliseconds>\n"
" -steps <number of steps in fade>\n");
- exit (1);
+ exit (exitcode);
+}
+
+static void
+missing_arg (const char *option)
+{
+ fprintf(stderr, "%s: %s requires an argument\n", program_name, option);
+ usage(1);
}
static long
@@ -129,13 +136,13 @@ main (int argc, char **argv)
{
if (!strcmp (argv[i], "-display") || !strcmp ("-d", argv[i]))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
dpy_name = argv[i];
continue;
}
if (!strcmp (argv[i], "-set") || !strcmp (argv[i], "="))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
op = Set;
value = atoi (argv[i]);
continue;
@@ -148,7 +155,7 @@ main (int argc, char **argv)
}
if (!strcmp (argv[i], "-inc") || !strcmp (argv[i], "+"))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
op = Inc;
value = atoi (argv[i]);
continue;
@@ -161,7 +168,7 @@ main (int argc, char **argv)
}
if (!strcmp (argv[i], "-dec") || !strcmp (argv[i], "-"))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
op = Dec;
value = atoi (argv[i]);
continue;
@@ -179,21 +186,23 @@ main (int argc, char **argv)
}
if (!strcmp (argv[i], "-time"))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
total_time = atoi (argv[i]);
continue;
}
if (!strcmp (argv[i], "-steps"))
{
- if (++i >= argc) usage();
+ if (++i >= argc) missing_arg (argv[i-1]);
steps = atoi (argv[i]);
continue;
}
if (!strcmp (argv[i], "-help") || !strcmp (argv[i], "-?"))
{
- usage ();
+ usage (0);
}
- usage ();
+ fprintf(stderr, "%s: unrecognized argument '%s'\n",
+ program_name, argv[i]);
+ usage (1);
}
conn = xcb_connect (dpy_name, NULL);
ver_cookie = xcb_randr_query_version (conn, 1, 2);