[libgpiod][PATCH 1/2] core: provide gpiod_line_bulk_clear()

[Bartosz Golaszewski <brgl@xxxxxxxx>]

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

Provide a helper function that allows to reset an existing bulk object.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
---
 include/gpiod.h | 6 ++++++
 lib/core.c      | 8 +++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/gpiod.h b/include/gpiod.h
index 8276f6a..7610eb1 100644
--- a/include/gpiod.h
+++ b/include/gpiod.h
@@ -649,6 +649,12 @@ gpiod_chip_find_lines(struct gpiod_chip *chip, const char **names) GPIOD_API;
  */
 struct gpiod_line_bulk *gpiod_line_bulk_new(unsigned int max_lines) GPIOD_API;
 
+/**
+ * @brief Reset a bulk object. Remove all lines and set size to 0.
+ * @param bulk Bulk object to reset.
+ */
+void gpiod_line_bulk_clear(struct gpiod_line_bulk *bulk) GPIOD_API;
+
 /**
  * @brief Release all resources allocated for this bulk object.
  * @param bulk Bulk object to free.
diff --git a/lib/core.c b/lib/core.c
index eb7d499..34f9017 100644
--- a/lib/core.c
+++ b/lib/core.c
@@ -106,12 +106,18 @@ struct gpiod_line_bulk *gpiod_line_bulk_new(unsigned int max_lines)
 	if (!bulk)
 		return NULL;
 
-	memset(bulk, 0, size);
 	bulk->max_lines = max_lines;
+	gpiod_line_bulk_clear(bulk);
 
 	return bulk;
 }
 
+void gpiod_line_bulk_clear(struct gpiod_line_bulk *bulk)
+{
+	bulk->num_lines = 0;
+	memset(bulk->lines, 0, bulk->max_lines * sizeof(struct line *));
+}
+
 void gpiod_line_bulk_free(struct gpiod_line_bulk *bulk)
 {
 	free(bulk);
-- 
2.29.1