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 #define TEXT_LEN 256 //max length of piped text
  15 enum params {//argv-indices:
  16         P_EXE, //executable name
  17         P_DEV, //device file
  18         P_LAY, //layout
  19         P_UNI, //unicode method
  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>\n", argv[P_EXE]);
  42                 fprintf (stderr, "Takes string to type from stdin\n");
  43                 return ERR_ARGCOUNT;
  44         }
  45         FILE* hid_dev = fopen ("/dev/hidg0", "w");
  46         char in_string[TEXT_LEN];
  47         fgets(in_string, TEXT_LEN, stdin);
  48         for (int i = 0; i < strlen (in_string); i++) {
  49                 if (in_string[i] < 32) {
  50                         fprintf (stderr, "Cannot print control characters!\n(Is there a newline at the end of your string?\n");
  51                         return ERR_SYMBOL;
  52                 }
  53
  54                 char tmp[UTF8_MAX_LENGTH] = {in_string[i], in_string[i+1], in_string[i+2], '\0'};
  55                 //TODO: replace by something less stupid
  56                 if (in_string[i] < 128) { // not multi byte
  57                         tmp[1] = '\0';
  58                 } else { // is multi byte
  59                         if (in_string[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 fclose (hid_dev);
  71                         return ERR_SYMBOL;
  72                 }
  73                 struct layout* l = tolay (s, atoi (argv[P_LAY]));
  74                 if (l == NULL) {
  75                         fprintf (stderr, "Unrecognised keyboard layout.\n");
  76 fclose (hid_dev);
  77                         return ERR_LAYOUT;
  78                 }
  79                 if (l->key != 0x00) {
  80                         send_key(hid_dev, l->key, l->mod);
  81                         send_key(hid_dev, '\0', '\0'); //release all keys
  82                         if (l->is_dead) {
  83                                 //dead keys need to be pressed twice to show up
  84                                 send_key(hid_dev, l->key, l->mod);
  85                                 send_key(hid_dev, '\0', '\0'); //release all keys
  86                         }
  87                 } else {
  88                         //key does not exist in this layout, use unicode method
  89                         //fprintf (stderr, "Warning: Key '%s'(0x%x) not in this layout!\n", s->sym, s->unicode);
  90                         send_unicode (hid_dev, s->unicode, atoi (argv[P_UNI]), atoi(argv[P_LAY]));
  91                 }
  92         }
  93         fclose (hid_dev);
  94
  95         return ERR_SUCCESS;
  96 }
  97
  98 void send_key (FILE* hid_dev, unsigned short key, unsigned short mod) {
  99         fprintf (hid_dev, "%c%c%c%c%c%c%c%c", mod, '\0', key, '\0', '\0', '\0', '\0', '\0');
 100 }
 101
 102 enum errors send_unicode (FILE* hid_dev, unsigned int unicode, enum uni_m method, enum kbdl layout) {
 103         char buf[10];
 104         struct keysym* s;
 105         struct layout* l;
 106
 107         if (unicode == 0x00) {
 108                 fprintf (stderr, "Symbol not in lookup table!\n");
 109                 return ERR_SYMBOL;
 110         }
 111
 112         switch (method) {
 113         case SKIP:
 114                 break;
 115         case GTK_HOLD:
 116                 sprintf (buf, "%x", unicode);
 117                 s = toscan ("u");
 118                 l = tolay (s, layout);
 119                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 120                 for (int i = 0; i < strlen (buf); i++) {
 121                         s = toscan ((char[2]){buf[i], '\0'});
 122                         l = tolay (s, layout);
 123                         send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 124                 }
 125                 send_key (hid_dev, '\0', '\0');
 126                 break;
 127         case GTK_SPACE:
 128                 sprintf (buf, "%x ", unicode);
 129                 s = toscan ("u");
 130                 l = tolay (s, layout);
 131                 send_key (hid_dev, l->key, MOD_LCTRL | MOD_LSHIFT);
 132                 for (int i = 0; i < strlen (buf); i++) {
 133                         s = toscan ((char[2]){buf[i], '\0'});
 134                         l = tolay (s, layout);
 135                         send_key (hid_dev, l->key, MOD_NONE);
 136                 }
 137                 send_key (hid_dev, '\0', '\0');
 138                 break;
 139         case WINDOWS:
 140                 fprintf (stderr, "windows method not implemented!\n");
 141                 return ERR_LAZY;
 142         default:
 143                 fprintf (stderr, "unknown unicode method!\n");
 144                 return ERR_LAYOUT; //TODO: better error code
 145         }
 146         return ERR_SUCCESS;
 147 }