From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Wed, 4 Oct 2017 07:07:44 +0000 (+0200)
Subject: line: provide gpiod_line_bulk_foreach_line()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5f20e774798e930467bed054e0f3a52e2e7e9c1d;p=qemu-gpiodev%2Flibgpiod.git

line: provide gpiod_line_bulk_foreach_line()

Add a macro allowing to easily iterate over all lines held by a line
bulk object.

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

diff --git a/include/gpiod.h b/include/gpiod.h
index 8c672a9..438744f 100644
--- a/include/gpiod.h
+++ b/include/gpiod.h
@@ -442,6 +442,18 @@ gpiod_line_bulk_num_lines(struct gpiod_line_bulk *bulk)
 	return bulk->num_lines;
 }
 
+/**
+ * @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 lineptr Pointer to a GPIO line handle used to store the loop state.
+ */
+#define gpiod_line_bulk_foreach_line(bulk, line, lineptr)		\
+	for ((lineptr) = (bulk)->lines, (line) = *(lineptr);		\
+	     (lineptr) <= (bulk)->lines + ((bulk)->num_lines - 1);	\
+	     (lineptr)++, (line) = *(lineptr))
+
 /**
  * @}
  *
diff --git a/tests/tests-line.c b/tests/tests-line.c
index b238c9b..7d4e3e1 100644
--- a/tests/tests-line.c
+++ b/tests/tests-line.c
@@ -501,3 +501,40 @@ static void line_empty_consumer(void)
 TEST_DEFINE(line_empty_consumer,
 	    "line request - empty consumer string",
 	    0, { 8 });
+
+static void line_bulk_foreach(void)
+{
+	static const char *const line_names[] = { "gpio-mockup-A-0",
+						  "gpio-mockup-A-1",
+						  "gpio-mockup-A-2",
+						  "gpio-mockup-A-3" };
+
+	TEST_CLEANUP(test_close_chip) struct gpiod_chip *chip = NULL;
+	struct gpiod_line_bulk bulk = GPIOD_LINE_BULK_INITIALIZER;
+	struct gpiod_line *line, **lineptr;
+	int i;
+
+	chip = gpiod_chip_open(test_chip_path(0));
+	TEST_ASSERT_NOT_NULL(chip);
+
+	for (i = 0; i < 4; i++) {
+		line = gpiod_chip_get_line(chip, i);
+		TEST_ASSERT_NOT_NULL(line);
+
+		gpiod_line_bulk_add(&bulk, line);
+	}
+
+	i = 0;
+	gpiod_line_bulk_foreach_line(&bulk, line, lineptr)
+		TEST_ASSERT_STR_EQ(gpiod_line_name(line), line_names[i++]);
+
+	i = 0;
+	gpiod_line_bulk_foreach_line(&bulk, line, lineptr) {
+		TEST_ASSERT_STR_EQ(gpiod_line_name(line), line_names[i++]);
+		if (i == 2)
+			break;
+	}
+}
+TEST_DEFINE(line_bulk_foreach,
+	    "line bulk - iterate over all lines",
+	    TEST_FLAG_NAMED_LINES, { 8 });