From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Mon, 23 Oct 2017 10:47:55 +0000 (+0200)
Subject: core: implement gpiod_line_bulk_foreach_line_off()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5ba624dd6901c08cf2140b0487debafbb72079a1;p=qemu-gpiodev%2Flibgpiod.git

core: implement gpiod_line_bulk_foreach_line_off()

Implement a variant of gpiod_line_bulk_foreach_line() which allows to
store the loop state in an integer counter variable.

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

diff --git a/include/gpiod.h b/include/gpiod.h
index 0f2839d..fa4c7b9 100644
--- a/include/gpiod.h
+++ b/include/gpiod.h
@@ -468,6 +468,23 @@ gpiod_line_bulk_num_lines(struct gpiod_line_bulk *bulk)
 	     (lineptr) <= (bulk)->lines + ((bulk)->num_lines - 1);	\
 	     (lineptr)++, (line) = *(lineptr))
 
+/**
+ * @brief Iterate over all line handles held by a line bulk object.
+ * @param bulk Line bulk object.
+ * @param line GPIO line handle. On each iteration, the subsequent line handle
+ *             is assigned to this pointer.
+ * @param offset An integer variable used to store the loop state.
+ *
+ * This is a variant of ::gpiod_line_bulk_foreach_line which uses an integer
+ * variable (either signed or unsigned) to store the loop state. This offset
+ * variable is guaranteed to correspond with the offset of the current line in
+ * the bulk->lines array.
+ */
+#define gpiod_line_bulk_foreach_line_off(bulk, line, offset)		\
+	for ((offset) = 0, (line) = (bulk)->lines[0];			\
+	     (offset) < (bulk)->num_lines;				\
+	     (offset)++, (line) = (bulk)->lines[(offset)])
+
 /**
  * @}
  *