examples: simplify find_line_by_name

Simplify the find_line_by_name example by using
gpiod_chip_get_line_offset_from_name() rather than iterating over each
line in a chip.

Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

diff --git a/examples/find_line_by_name.c b/examples/find_line_by_name.c
index 16d2c4c981e2f3a8956b3a1de86453793f120742..346d258529356f25b3b3ad8477f7a073b03709ca 100644 (file)
--- a/examples/find_line_by_name.c
+++ b/examples/find_line_by_name.c
@@ -69,12 +69,9 @@ int main(void)
        static const char *const line_name = "GPIO19";
 
        struct gpiod_chip_info *cinfo;
-       struct gpiod_line_info *linfo;
-       unsigned int j, num_lines;
+       int i, num_chips, offset;
        struct gpiod_chip *chip;
        char **chip_paths;
-       const char *name;
-       int i, num_chips;
 
        /*
         * Names are not guaranteed unique, so this finds the first line with
@@ -85,26 +82,21 @@ int main(void)
                chip = gpiod_chip_open(chip_paths[i]);
                if (!chip)
                        continue;
+
+               offset = gpiod_chip_get_line_offset_from_name(chip, line_name);
+               if (offset == -1)
+                       goto close_chip;
+
                cinfo = gpiod_chip_get_info(chip);
                if (!cinfo)
-                       continue;
+                       goto close_chip;
 
-               num_lines = gpiod_chip_info_get_num_lines(cinfo);
-               for (j = 0; j < num_lines; j++) {
-                       linfo = gpiod_chip_get_line_info(chip, j);
-                       if (!linfo)
-                               continue;
-                       name = gpiod_line_info_get_name(linfo);
-                       if (name && (strcmp(line_name, name) == 0)) {
-                               printf("%s: %s %d\n", line_name,
-                                      gpiod_chip_info_get_name(cinfo), j);
-                               return EXIT_SUCCESS;
-                       }
-
-                       gpiod_line_info_free(linfo);
-               }
+               printf("%s: %s %d\n", line_name,
+                      gpiod_chip_info_get_name(cinfo), offset);
+
+               return EXIT_SUCCESS;
 
-               gpiod_chip_info_free(cinfo);
+close_chip:
                gpiod_chip_close(chip);
        }