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         NUM_P  //number of parameters
  20 };
  21 enum uni_m {//unicode methods:
  22         SKIP, //ignore any keys not on the layout
  23         GTK_HOLD, //hold ctrl and shift while entering hex values
  24         GTK_SPACE, //end hex sequence with spacebar
  25         WINDOWS //use alt+numpad
  26 };
  27 enum errors {
  28         ERR_SUCCESS, //no error
  29         ERR_ARGCOUNT, //wrong number of arguments
  30         ERR_SYMBOL, //symbol not in look up table
  31         ERR_LAYOUT, //parameter P_LAY does not contain a correct keyboard layout
  32         ERR_LAZY //i haven't done this
  33 };
  34
  35 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod);
  36 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout);
  37
  38 int main (int argc, char** argv) {
  39         if (argc != NUM_P) {
  40                 fprintf (stderr, "Usage: %s <device file> <layout> <unicode>\n", argv[P_EXE]);
  41                 fprintf (stderr, "Takes string to type from stdin\n");
  42                 return ERR_ARGCOUNT;
  43         }
  44         FILE* hid_dev = fopen ("/dev/hidg0", "w");
  45         char in_string[256];
  46         fgets(in_string, 256, stdin);
  47         for (int i = 0; i < strlen (in_string); i++) {
  48
  49                 char tmp[UTF8_MAX_LENGTH] = {in_string[i], in_string[i+1], in_string[i+2], '\0'};
  50                 //TODO: replace by something less stupid
  51                 if (in_string[i] < 128) { // not multi byte
  52                         tmp[1] = '\0';
  53                 } else { // is multi byte
  54                         if (in_string[i] < 0xe0) {
  55                         i++; //skip next thing
  56                         tmp[2] = 0;
  57                         } else {
  58                         i+=2; //WARN: fails on utf8 > 3 byte
  59                         }
  60                 }
  61
  62                 struct keysym* s = toscan (tmp);
  63                 if (s == NULL) {
  64                         fprintf (stderr, "Key Symbol not found.\n");
  65 fclose (hid_dev);
  66                         return ERR_SYMBOL;
  67                 }
  68                 struct layout* l = tolay (s, atoi (argv[P_LAY]));
  69                 if (l == NULL) {
  70                         fprintf (stderr, "Unrecognised keyboard layout.\n");
  71 fclose (hid_dev);
  72                         return ERR_LAYOUT;
  73                 }
  74                 if (l->key != 0x00) {
  75                         send_key(hid_dev, l->key, l->mod);
  76                         send_key(hid_dev, '\0', '\0'); //release all keys
  77                         if (l->is_dead) {
  78                                 //dead keys need to be pressed twice to show up
  79                                 send_key(hid_dev, l->key, l->mod);
  80                                 send_key(hid_dev, '\0', '\0'); //release all keys
  81                         }
  82                 } else {
  83                         //key does not exist in this layout, use unicode method
  84                         //fprintf (stderr, "Warning: Key '%s'(0x%x) not in this layout!\n", s->sym, s->unicode);
  85                         send_unicode (hid_dev, s->unicode, atoi (argv[P_UNI]), atoi(argv[P_LAY]));
  86                 }
  87         }
  88         fclose (hid_dev);
  89
  90         return ERR_SUCCESS;
  91 }
  92
  93 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod) {
  94         fprintf (hid_dev, "%c%c%c%c%c%c%c%c", mod, '\0', key, '\0', '\0', '\0', '\0', '\0');
  95 }
  96
  97 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout) {
  98         char buf[10];
  99         struct keysym* s;
 100         struct layout* l;
 101
 102         if (unicode == 0x00) {
 103                 fprintf (stderr, "Symbol not in lookup table!\n");
 104                 return ERR_SYMBOL;
 105         }
 106
 107         switch (method) {
 108         case SKIP:
 109                 break;
 110         case GTK_HOLD:
 111                 sprintf (buf, "%x", unicode);
 112                 s = toscan ("u");
 113                 l = tolay (s, layout);
 114                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 115                 for (int i = 0; i < strlen (buf); i++) {
 116                         s = toscan ((char[2]){buf[i], '\0'});
 117                         l = tolay (s, layout);
 118                         send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 119                 }
 120                 send_key (hid_dev, '\0', '\0');
 121                 break;
 122         case GTK_SPACE:
 123                 sprintf (buf, "%x ", unicode);
 124                 s = toscan ("u");
 125                 l = tolay (s, layout);
 126                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 127                 for (int i = 0; i < strlen (buf); i++) {
 128                         s = toscan ((char[2]){buf[i], '\0'});
 129                         l = tolay (s, layout);
 130                         send_key (hid_dev, l->key, MOD_NONE);
 131                 }
 132                 send_key (hid_dev, '\0', '\0');
 133                 break;
 134         case WINDOWS:
 135                 fprintf (stderr, "windows method not implemented!\n");
 136                 return ERR_LAZY;
 137         default:
 138                 fprintf (stderr, "unknown unicode method!\n");
 139                 return ERR_LAYOUT; //TODO: better error code
 140         }
 141         return ERR_SUCCESS;
 142 }