gpiofind: user tools-common

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

diff --git a/gpiofind.c b/gpiofind.c
index fe3eb64be4d12e2cbbf9d6bc694016975d57ee15..fe714cd69c3383af04dff78ed52d0dce532cb4ca 100644 (file)
--- a/gpiofind.c
+++ b/gpiofind.c
@@ -9,20 +9,50 @@
  */
 
 #include "gpiod.h"
+#include "tools-common.h"
 
 #include <stdio.h>
 #include <string.h>
+#include <getopt.h>
+
+static const struct option longopts[] = {
+       { "help", no_argument, NULL, 'h' },
+       { 0 },
+};
+
+static const char *const shortopts = "+h";
 
 int main(int argc, char **argv)
 {
        struct gpiod_line *line;
        struct gpiod_chip *chip;
+       int optc, opti;
 
-       if (argc < 2) {
-               fprintf(stderr, "%s: gpiochip must be specified\n", argv[0]);
-               return EXIT_FAILURE;
+       set_progname(argv[0]);
+
+       for (;;) {
+               optc = getopt_long(argc, argv, shortopts, longopts, &opti);
+               if (optc < 0)
+                       break;
+
+               switch (optc) {
+               case 'h':
+                       printf("Usage: %s [NAME]\n", get_progname());
+                       printf("Find a GPIO line by name.\n");
+                       exit(EXIT_SUCCESS);
+               case '?':
+                       die("try %s --help", get_progname());
+               default:
+                       abort();
+               }
        }
 
+       argc -= optind;
+       argv += optind;
+
+       if (argc != 1)
+               die("GPIO line name must be specified\n");
+
        line = gpiod_line_find_by_name(argv[1]);
        if (!line)
                return EXIT_FAILURE;