If no device file is given, display the list

Code taken from evtest, but since I wrote that code I'm happy for the
relicensing. License picked for that code is MIT so we won't have to worry
about copying that code in the future.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

5 files changed, 132 insertions, 5 deletions

diff --git a/tools/Makefile.am b/tools/Makefile.am
index dd5bdd8..e471570 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -12,7 +12,8 @@ INCLUDES=-I$(top_srcdir)/include/
 
 AM_LDFLAGS = $(top_builddir)/src/libevemu.la
 
-evemu_describe_SOURCES = evemu-record.c
+evemu_describe_SOURCES = evemu-record.c find_event_devices.c find_event_devices.h
+evemu_record_SOURCES = evemu-record.c find_event_devices.c find_event_devices.h
 
 # man page generation
 if HAVE_DOCTOOLS
diff --git a/tools/evemu-describe.txt b/tools/evemu-describe.txt
index 8544169..a0469d5 100644
--- a/tools/evemu-describe.txt
+++ b/tools/evemu-describe.txt
@@ -9,9 +9,9 @@ NAME
 
 SYNOPSIS
 --------
-     evemu-describe /dev/input/eventX
+     evemu-describe [/dev/input/eventX]
 
-     evemu-record /dev/input/eventX
+     evemu-record [/dev/input/eventX]
 
 DESCRIPTION
 -----------
@@ -26,6 +26,10 @@ device created with evemu-device(1) emit the exact same event sequence.
 evemu-describe and evemu-record need to be able to read from the device; in
 most cases this means they must be run as root.
 
+If an event node is provided, evemu-describe and evemu-record use that event
+node. Otherwise, the user must interactively choose from a list of detected
+devices.
+
 DIAGNOSTICS
 -----------
 If evtest-record does not see any events even though the device is being
diff --git a/tools/evemu-record.c b/tools/evemu-record.c
index 38d49b9..8fe2a57 100644
--- a/tools/evemu-record.c
+++ b/tools/evemu-record.c
@@ -42,11 +42,14 @@
 #define _GNU_SOURCE
 #include "evemu.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <fcntl.h>
 #include <string.h>
 #include <unistd.h>
 #include <signal.h>
 
+#include "find_event_devices.h"
+
 #define INFINITE -1
 
 FILE *output;
@@ -89,17 +92,20 @@ int main(int argc, char *argv[])
 	int fd;
 	struct sigaction act;
 	char *prgm_name = program_invocation_short_name;
+	char *device;
 
 	if (prgm_name && (strcmp(prgm_name, "evemu-describe") == 0 ||
 			/* when run directly from the sources (not installed) */
 			strcmp(prgm_name, "lt-evemu-describe") == 0))
 		mode = EVEMU_DESCRIBE;
 
-	if (argc < 2) {
+	device = (argc < 2) ? find_event_devices() : strdup(argv[1]);
+
+	if (device == NULL) {
 		fprintf(stderr, "Usage: %s <device> [output file]\n", argv[0]);
 		return -1;
 	}
-	fd = open(argv[1], O_RDONLY | O_NONBLOCK);
+	fd = open(device, O_RDONLY | O_NONBLOCK);
 	if (fd < 0) {
 		fprintf(stderr, "error: could not open device\n");
 		return -1;
@@ -146,6 +152,7 @@ int main(int argc, char *argv[])
 	}
 
 out:
+	free(device);
 	close(fd);
 	if (output != stdout) {
 		fclose(output);
diff --git a/tools/find_event_devices.c b/tools/find_event_devices.c
new file mode 100644
index 0000000..fd3dc3a
--- /dev/null
+++ b/tools/find_event_devices.c
@@ -0,0 +1,85 @@
+/*****************************************************************************
+ * Copyright (C) 2013 Red Hat, Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ ****************************************************************************/
+
+#define _GNU_SOURCE
+#include <linux/input.h>
+#include <dirent.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+
+#define DEV_INPUT_EVENT "/dev/input"
+#define EVENT_DEV_NAME "event"
+
+static int is_event_device(const struct dirent *dir) {
+	return strncmp(EVENT_DEV_NAME, dir->d_name, 5) == 0;
+}
+
+char* find_event_devices(void)
+{
+	struct dirent **namelist;
+	int i, ndev, devnum;
+	char *filename;
+
+	ndev = scandir(DEV_INPUT_EVENT, &namelist, is_event_device, alphasort);
+	if (ndev <= 0)
+		return NULL;
+
+	fprintf(stderr, "Available devices:\n");
+
+	for (i = 0; i < ndev; i++)
+	{
+		char fname[64];
+		int fd = -1;
+		char name[256] = "???";
+
+		snprintf(fname, sizeof(fname),
+			 "%s/%s", DEV_INPUT_EVENT, namelist[i]->d_name);
+		fd = open(fname, O_RDONLY);
+		if (fd < 0)
+			continue;
+		ioctl(fd, EVIOCGNAME(sizeof(name)), name);
+
+		fprintf(stderr, "%s:	%s\n", fname, name);
+		close(fd);
+		free(namelist[i]);
+	}
+
+	fprintf(stderr, "Select the device event number [0-%d]: ", ndev - 1);
+	scanf("%d", &devnum);
+
+	if (devnum >= ndev || devnum < 0)
+		return NULL;
+
+	asprintf(&filename, "%s/%s%d",
+		 DEV_INPUT_EVENT, EVENT_DEV_NAME,
+		 devnum);
+
+	return filename;
+}
diff --git a/tools/find_event_devices.h b/tools/find_event_devices.h
new file mode 100644
index 0000000..04b87c1
--- /dev/null
+++ b/tools/find_event_devices.h
@@ -0,0 +1,30 @@
+/*****************************************************************************
+ * Copyright (C) 2013 Red Hat, Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ ****************************************************************************/
+
+#ifndef FIND_EVENT_DEVICES_H
+#define FIND_EVENT_DEVICES_H
+
+char* find_event_devices(void);
+
+#endif