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diff -Naur esekeyd-esekeyd-1.2.7/src/input.c esekeyd-esekeyd-1.2.7.patched/src/input.c
--- esekeyd-esekeyd-1.2.7/src/input.c 2010-07-04 16:23:51.000000000 -0400
+++ esekeyd-esekeyd-1.2.7.patched/src/input.c 2020-11-01 20:22:49.777498592 -0500
@@ -10,6 +10,14 @@
#include "esekey.h"
+#include <dirent.h>
+#define CLASS_DIR "/sys/class/input"
+#define DEV_DIR "/dev/input"
+
+#ifndef PATH_MAX
+# define PATH_MAX 1024
+#endif
+
signed char check_handlers (void)
{
FILE *fp = NULL;
@@ -45,32 +53,63 @@
return 0;
}
-signed char find_input_dev (void)
+/* return true if /dev/input/event<devno> is a keyboard.
+ This could also have been done by way of ioctls instead of reading
+ from /sys files. Hopefully the /sys API doesn't change...
+ It's documented thoroughly here:
+ https://unix.stackexchange.com/questions/74903/explain-ev-in-proc-bus-input-devices-data
+ */
+int is_keyboard(int devno)
{
- FILE *fp = NULL;
- signed char have_evdev = -2;
+ char filename[PATH_MAX + 1];
+ char *buf = NULL;
+ size_t len = 0, caps = 0;
+ size_t wantcaps = (1 << EV_SYN | 1 << EV_KEY | 1 << EV_MSC | 1 << EV_LED | 1 << EV_REP);
+ FILE *fp;
+
+ sprintf(filename, "%s/event%d/device/capabilities/ev", CLASS_DIR, devno);
+ if(!(fp = fopen(filename, "r"))) return 0;
+
+ getline(&buf, &len, fp);
+ fclose(fp);
+ if(!buf) return 0;
- fp = fopen (INPUT_DEVICES, "r");
+ caps = strtol(buf, NULL, 16);
+ free(buf);
- if (!fp)
+ return (caps & wantcaps) == wantcaps;
+}
+
+/* returns the highest-numbered keyboard found. The common case is
+ that the internal keyboard on a laptop is numbered lower than an external
+ keyboard, and we assume that if there's an external, it's the one the
+ user actually uses. If no keyboards are found, returns -1. */
+signed char find_input_dev (void)
+{
+ DIR *dir;
+ struct dirent *entry;
+ int last_kbd = -1;
+ char buf[PATH_MAX + 1];
+
+ dir = opendir(CLASS_DIR);
+ if(!dir) {
+ perror(CLASS_DIR);
return -1;
+ }
- while (!feof (fp))
- {
- char *buff = NULL;
- size_t len = 0;
- short int number = -2;
- getline (&buff, &len, fp);
- sscanf (buff, "H: Handlers=kbd event%hu", &number);
- free (buff);
- if (number > -1)
- {
- have_evdev = number;
- break;
+ while( (entry = readdir(dir)) ) {
+ sprintf(buf, "%s/%s", CLASS_DIR, entry->d_name);
+ if(strncmp(entry->d_name, "event", 5) == 0) {
+ int devno = atoi(entry->d_name + 5);
+ if(is_keyboard(devno)) {
+ fprintf(stderr, "event%d is a keyboard\n", devno);
+ if(devno > last_kbd) last_kbd = devno;
+ }
}
}
+ closedir(dir);
- fclose (fp);
+ fprintf(stderr, "Autodetected keyboard: %s/event%d\n", DEV_DIR, last_kbd);
- return have_evdev;
+ return last_kbd;
}
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