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 (1=en_us, 2=de_at, 3=de_at-nodeadkeys)
   6         unicode method: 1=gtk_holddown, 2=gtk_spaceend, 3=windows
   7         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.)
   8 */
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include "scancodes.h"
  13
  14 enum params {//argv-indices:
  15         P_EXE, //executable name
  16         P_DEV, //device file
  17         P_LAY, //layout
  18         P_UNI, //unicode method
  19         P_STR, //string to type
  20         NUM_P  //number of parameters
  21 };
  22 enum uni_m {//unicode methods:
  23         SKIP, //ignore any keys not on the layout
  24         GTK_HOLD, //hold ctrl and shift while entering hex values
  25         GTK_SPACE, //end hex sequence with spacebar
  26         WINDOWS //use alt+numpad
  27 };
  28 enum errors {
  29         ERR_SUCCESS, //no error
  30         ERR_ARGCOUNT, //wrong number of arguments
  31         ERR_SYMBOL, //symbol not in look up table
  32         ERR_LAYOUT, //parameter P_LAY does not contain a correct keyboard layout
  33         ERR_LAZY //i haven't done this
  34 };
  35
  36 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod);
  37 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout);
  38
  39 int main (int argc, char** argv) {
  40         if (argc != NUM_P) {
  41                 fprintf (stderr, "Usage: %s <device file> <layout> <unicode> \"<string>\"\n", argv[P_EXE]);
  42                 return ERR_ARGCOUNT;
  43         }
  44         FILE* hid_dev = fopen ("/dev/hidg0", "w");
  45         for (int i = 0; i < strlen (argv[P_STR]); i++) {
  46
  47                 char tmp[UTF8_MAX_LENGTH] = {argv[P_STR][i], argv[P_STR][i+1], argv[P_STR][i+2], '\0'};
  48                 //TODO: replace by something less stupid
  49                 if (argv[P_STR][i] < 128) { // not multi byte
  50                         tmp[1] = '\0';
  51                 } else { // is multi byte
  52                         if (argv[P_STR][i] < 0xe0) {
  53                         i++; //skip next thing
  54                         tmp[2] = 0;
  55                         } else {
  56                         i+=2; //WARN: fails on utf8 > 3 byte
  57                         }
  58                 }
  59
  60                 struct keysym* s = toscan (tmp);
  61                 if (s == NULL) {
  62                         fprintf (stderr, "Key Symbol not found.\n");
  63 fclose (hid_dev);
  64                         return ERR_SYMBOL;
  65                 }
  66                 struct layout* l = tolay (s, atoi (argv[P_LAY]));
  67                 if (l == NULL) {
  68                         fprintf (stderr, "Unrecognised keyboard layout.\n");
  69 fclose (hid_dev);
  70                         return ERR_LAYOUT;
  71                 }
  72                 if (l->key != 0x00) {
  73                         send_key(hid_dev, l->key, l->mod);
  74                         send_key(hid_dev, '\0', '\0'); //release all keys
  75                         if (l->is_dead) {
  76                                 //dead keys need to be pressed twice to show up
  77                                 send_key(hid_dev, l->key, l->mod);
  78                                 send_key(hid_dev, '\0', '\0'); //release all keys
  79                         }
  80                 } else {
  81                         //key does not exist in this layout, use unicode method
  82                         //fprintf (stderr, "Warning: Key '%s'(0x%x) not in this layout!\n", s->sym, s->unicode);
  83                         send_unicode (hid_dev, s->unicode, atoi (argv[P_UNI]), atoi(argv[P_LAY]));
  84                 }
  85         }
  86         fclose (hid_dev);
  87
  88         return ERR_SUCCESS;
  89 }
  90
  91 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod) {
  92         fprintf (hid_dev, "%c%c%c%c%c%c%c%c", mod, '\0', key, '\0', '\0', '\0', '\0', '\0');
  93 }
  94
  95 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout) {
  96         char buf[10];
  97         struct keysym* s;
  98         struct layout* l;
  99
 100         if (unicode == 0x00) {
 101                 fprintf (stderr, "Symbol not in lookup table!\n");
 102                 return ERR_SYMBOL;
 103         }
 104
 105         switch (method) {
 106         case SKIP:
 107                 break;
 108         case GTK_HOLD:
 109                 sprintf (buf, "%x", unicode);
 110                 s = toscan ("u");
 111                 l = tolay (s, layout);
 112                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 113                 for (int i = 0; i < strlen (buf); i++) {
 114                         s = toscan ((char[2]){buf[i], '\0'});
 115                         l = tolay (s, layout);
 116                         send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 117                 }
 118                 send_key (hid_dev, '\0', '\0');
 119                 break;
 120         case GTK_SPACE:
 121                 sprintf (buf, "%x ", unicode);
 122                 s = toscan ("u");
 123                 l = tolay (s, layout);
 124                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 125                 for (int i = 0; i < strlen (buf); i++) {
 126                         s = toscan ((char[2]){buf[i], '\0'});
 127                         l = tolay (s, layout);
 128                         send_key (hid_dev, l->key, MOD_NONE);
 129                 }
 130                 send_key (hid_dev, '\0', '\0');
 131                 break;
 132         case WINDOWS:
 133                 fprintf (stderr, "windows method not implemented!\n");
 134                 return ERR_LAZY;
 135         default:
 136                 fprintf (stderr, "unknown unicode method!\n");
 137                 return ERR_LAYOUT; //TODO: better error code
 138         }
 139         return ERR_SUCCESS;
 140 }