gpiofind: add options to the help text

Also: move displaying the help message to a separate function.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>

diff --git a/gpiofind.c b/gpiofind.c
index fe714cd69c3383af04dff78ed52d0dce532cb4ca..8a276c3d25a4587b9181b33c80d3992df3d29d35 100644 (file)
--- a/gpiofind.c
+++ b/gpiofind.c
@@ -22,6 +22,14 @@ static const struct option longopts[] = {
 
 static const char *const shortopts = "+h";
 
+static void print_help(void)
+{
+       printf("Usage: %s <options> [NAME]\n", get_progname());
+       printf("Find a GPIO line by name.\n");
+       printf("Options:\n");
+       printf("  -h, --help:\t\tdisplay this message and exit\n");
+}
+
 int main(int argc, char **argv)
 {
        struct gpiod_line *line;
@@ -37,8 +45,7 @@ int main(int argc, char **argv)
 
                switch (optc) {
                case 'h':
-                       printf("Usage: %s [NAME]\n", get_progname());
-                       printf("Find a GPIO line by name.\n");
+                       print_help();
                        exit(EXIT_SUCCESS);
                case '?':
                        die("try %s --help", get_progname());