Do not relay on libevdev for button/axis names, an prepare for device specific names, and add reverse lookup functions

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 29 insertions, 0 deletions

diff --git a/libgamepad_get_relative_axis_by_name.c b/libgamepad_get_relative_axis_by_name.c
new file mode 100644
index 0000000..f7f2a72
--- /dev/null
+++ b/libgamepad_get_relative_axis_by_name.c
@@ -0,0 +1,29 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int16_t
+libgamepad_get_relative_axis_by_name(const char *name)
+{
+	size_t code;
+	int saved_errno;
+	char *end;
+	if (!name || !*name)
+		return -1;
+	if (isdigit(*name)) {
+		saved_errno = errno;
+		errno = 0;
+		code = (size_t)strtoul(name, &end, 0);
+		if (errno || *end || code > (size_t)REL_MAX) {
+			errno = saved_errno;
+			return -1;
+		}
+		errno = saved_errno;
+		return (int16_t)code;
+	} else {
+		for (code = 0; code < ELEMSOF(libgamepad_relative_axis_names__); code++)
+			if (!strcasecmp(name, libgamepad_relative_axis_names__[code]))
+				return (int16_t)code;
+		return -1;
+	}
+}