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 kbdl {  //keyboard layouts:
  23         na_NA, //reserved
  24         en_US,
  25         de_AT,
  26         de_ND //de_AT-nodeadkeys
  27 };
  28 enum uni_m {//unicode methods:
  29         SKIP, //ignore any keys not on the layout
  30         GTK_HOLD, //hold ctrl and shift while entering hex values
  31         GTK_SPACE, //end hex sequence with spacebar
  32         WINDOWS //use alt+numpad
  33 };
  34 enum errors {
  35         ERR_SUCCESS, //no error
  36         ERR_ARGCOUNT, //wrong number of arguments
  37         ERR_SYMBOL, //symbol not in look up table
  38         ERR_LAYOUT, //parameter P_LAY does not contain a correct keyboard layout
  39         ERR_LAZY //i haven't done this
  40 };
  41
  42 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod);
  43 struct layout* tolay (struct keysym* s, enum kbdl layout);
  44 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout);
  45
  46 int main (int argc, char** argv) {
  47         if (argc != NUM_P) {
  48                 fprintf (stderr, "Usage: %s <device file> <layout> <unicode> \"<string>\"\n", argv[P_EXE]);
  49                 return ERR_ARGCOUNT;
  50         }
  51         FILE* hid_dev = fopen ("/dev/hidg0", "w");
  52         for (int i = 0; i < strlen (argv[P_STR]); i++) {
  53
  54                 char tmp[UTF8_MAX_LENGTH] = {argv[P_STR][i], argv[P_STR][i+1], argv[P_STR][i+2], '\0'};
  55                 //TODO: replace by something less stupid
  56                 if (argv[P_STR][i] < 128) { // not multi byte
  57                         tmp[1] = '\0';
  58                 } else { // is multi byte
  59                         if (argv[P_STR][i] < 0xe0) {
  60                         i++; //skip next thing
  61                         tmp[2] = 0;
  62                         } else {
  63                         i+=2; //WARN: fails on utf8 > 3 byte
  64                         }
  65                 }
  66
  67                 struct keysym* s = toscan (tmp);
  68                 if (s == NULL) {
  69                         fprintf (stderr, "Key Symbol not found.\n");
  70                         return ERR_SYMBOL;
  71                 }
  72                 struct layout* l = tolay (s, atoi (argv[P_LAY]));
  73                 if (l == NULL) {
  74                         fprintf (stderr, "Unrecognised keyboard layout.\n");
  75                         return ERR_LAYOUT;
  76                 }
  77                 if (l->key != 0x00) {
  78                         send_key(hid_dev, l->key, l->mod);
  79                         send_key(hid_dev, '\0', '\0'); //release all keys
  80                         if (l->is_dead) {
  81                                 //dead keys need to be pressed twice to show up
  82                                 send_key(hid_dev, l->key, l->mod);
  83                                 send_key(hid_dev, '\0', '\0'); //release all keys
  84                         }
  85                 } else {
  86                         //key does not exist in this layout, use unicode method
  87                         fprintf (stderr, "Warning: Key not in this layout!\n");
  88                         send_unicode (hid_dev, s->unicode, atoi (argv[P_UNI]), atoi(argv[P_LAY]));
  89                 }
  90         }
  91         fclose (hid_dev);
  92
  93         return ERR_SUCCESS;
  94 }
  95
  96 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod) {
  97         fprintf (hid_dev, "%c%c%c%c%c%c%c%c", mod, '\0', key, '\0', '\0', '\0', '\0', '\0');
  98 }
  99
 100 struct layout* tolay (struct keysym* s, enum kbdl layout) {
 101         switch (layout) {
 102         case en_US: return &(s->en_us);
 103         case de_AT: return &(s->de_at);
 104         case de_ND: return &(s->de_nd);
 105         default: return NULL;
 106         }
 107 }
 108
 109 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout) {
 110         char buf[10];
 111         struct keysym* s;
 112         struct layout* l;
 113
 114         if (unicode == 0x00) {
 115                 fprintf (stderr, "Symbol not in lookup table!\n");
 116                 return ERR_SYMBOL;
 117         }
 118
 119         switch (method) {
 120         case SKIP:
 121                 break;
 122         case GTK_HOLD:
 123                 fprintf (stderr, "Hold-down X11 not implemented!\n");
 124                 return ERR_LAZY;
 125         case GTK_SPACE:
 126                 sprintf (buf, "%x", unicode);
 127                 s = toscan ("u");
 128                 l = tolay (s, layout);
 129                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 130                 for (int i = 0; i < strlen (buf); i++) {
 131                         s = toscan (buf);
 132                         l = tolay (s, layout);
 133                         send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 134                 }
 135                 send_key (hid_dev, '\0', '\0');
 136                 break;
 137         case WINDOWS:
 138                 fprintf (stderr, "windows method not implemented!\n");
 139                 return ERR_LAZY;
 140         default:
 141                 fprintf (stderr, "unknown unicode method!\n");
 142                 return ERR_LAYOUT; //TODO: better error code
 143         }
 144         return ERR_SUCCESS;
 145 }