main.c

   1 /*
   2 description: sends a sequence of keystrokes to the hid device.
   3 parameters:
   4         device file (e.g. /dev/hidg0)
   5         keyboard layout (e.g. en_us; only a limited number are supported and they do not follow unix-naming conventions for convenience)
   6         the string to send (as whitespace is important, the `echo` way of concatenating all parameters is not supported. if your string has white space in it and you are in an interactive session, quote your string.
   7 */
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include "scancodes.h"
  12
  13 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod);
  14
  15 int main (int argc, char** argv) {
  16         if (argc != 4) {
  17                 fprintf (stderr, "Usage: %s <device file> <layout> \"<string>\"\n", argv[0]);
  18                 return 1;
  19         }
  20         FILE* hid_dev = fopen ("/dev/hidg0", "w");
  21         for (int i = 0; i < strlen (argv[3]); i++) {
  22
  23                 char tmp[UTF8_MAX_LENGTH] = {argv[3][i], argv[3][i+1], argv[3][i+2], '\0'};
  24                 //TODO: replace by something less stupid
  25                 if (argv[3][i] < 128) { // not multi byte
  26                         tmp[1] = '\0';
  27                 } else { // is multi byte
  28                         if (argv[3][i] < 0xe0) {
  29                         i++; //skip next thing
  30                         tmp[2] = 0;
  31                         } else {
  32                         i+=2; //WARN: fails on utf8 > 3 byte
  33                         }
  34                 }
  35
  36                 struct keysym* s = toscan (tmp);
  37                 if (s == NULL) {
  38                         fprintf (stderr, "Key Symbol not found.\n");
  39                         return 1;
  40                 }
  41                 switch (atoi (argv[2])) {
  42                 case 0:
  43                         fprintf (stderr, "This keyboard layout is reserved.\n");
  44                         return 1;
  45                 case 1: //en_us
  46                         send_key(hid_dev, s->en_us.key, s->en_us.mod);
  47                         break;
  48                 case 2: //de_at
  49                         send_key(hid_dev, s->de_at.key, s->de_at.mod);//, s->de_at.is_dead);
  50                         break;
  51                 case 3: //de_at-nodeadkeys
  52                         send_key(hid_dev, s->de_at.key, s->de_at.mod);
  53                         break;
  54                 default:
  55                         fprintf (stderr, "Unrecognised keyboard layout.\n");
  56                         return 1;
  57                 }
  58                 send_key(hid_dev, '\0', '\0');
  59         }
  60         fclose (hid_dev);
  61
  62         return 0;
  63 }
  64
  65 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod) {
  66         fprintf (hid_dev, "%c%c%c%c%c%c%c%c", mod, '\0', key, '\0', '\0', '\0', '\0', '\0');
  67 }