core: implement gpiod_line_find_by_name()

Implement a routine for finding lines by name.

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

diff --git a/core.c b/core.c
index 2c6bd56dfd890a35e8ea379e22f7908d75409102..a90c2ecc4fe1af3e93961fcc39eee99d8d2b66a5 100644 (file)
--- a/core.c
+++ b/core.c
@@ -629,3 +629,31 @@ struct gpiod_chip * gpiod_chip_iter_next(struct gpiod_chip_iter *iter)
 
        return NULL;
 }
+
+struct gpiod_line * gpiod_line_find_by_name(const char *name)
+{
+       struct gpiod_chip_iter *chip_iter;
+       struct gpiod_line_iter line_iter;
+       struct gpiod_chip *chip;
+       struct gpiod_line *line;
+
+       chip_iter = gpiod_chip_iter_new();
+       if (!chip_iter)
+               return NULL;
+
+       gpiod_foreach_chip(chip_iter, chip) {
+               gpiod_line_iter_init(&line_iter, chip);
+               gpiod_foreach_line(&line_iter, line) {
+                       if (strcmp(gpiod_line_name(line), name) == 0) {
+                               /* TODO A separate function for that maybe? */
+                               closedir(chip_iter->dir);
+                               free(chip_iter);
+                               return line;
+                       }
+               }
+       }
+
+       gpiod_chip_iter_free(chip_iter);
+
+       return NULL;
+}

diff --git a/gpiod.h b/gpiod.h
index d223b1c068b25f7a453d4ce3d992563711bd6bf2..e228dd23a4fb2dd6277f3b519ba63d8c886c8272 100644 (file)
--- a/gpiod.h
+++ b/gpiod.h
@@ -135,6 +135,8 @@ int gpiod_line_set_value(struct gpiod_line *line, int value) GPIOD_API;
 int gpiod_line_set_value_bulk(struct gpiod_line_bulk *line_bulk,
                              int *values) GPIOD_API;
 
+struct gpiod_line * gpiod_line_find_by_name(const char *name) GPIOD_API;
+
 struct gpiod_chip;
 
 struct gpiod_chip * gpiod_chip_open(const char *path) GPIOD_API;