commands/loadkeys/loadkeys.c

   1 /*      loadkeys - load national keyboard map           Author: Marcus Hampel
   2  */
   3 #include <sys/types.h>
   4 #include <sys/ioctl.h>
   5 #include <minix/keymap.h>
   6 #include <fcntl.h>
   7 #include <unistd.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <errno.h>
  11
  12 #if __minix_vmd
  13 #define KBD_DEVICE      "/dev/kbd"
  14 #else
  15 #define KBD_DEVICE      "/dev/console"
  16 #endif
  17
  18 u16_t keymap[NR_SCAN_CODES * MAP_COLS];
  19 u8_t comprmap[4 + NR_SCAN_CODES * MAP_COLS * 9/8 * 2 + 1];
  20
  21
  22 void tell(char *s)
  23 {
  24   write(2, s, strlen(s));
  25 }
  26
  27
  28 void fatal(char *say)
  29 {
  30   int err = errno;
  31   tell("loadkeys: ");
  32   if (say != NULL) {
  33         tell(say);
  34         tell(": ");
  35   }
  36   tell(strerror(err));
  37   tell("\n");
  38   exit(1);
  39 }
  40
  41
  42 void usage(void)
  43 {
  44   tell("Usage: loadkeys mapfile\n");
  45   exit(1);
  46 }
  47
  48
  49 int main(int argc, char *argv[])
  50 {
  51   u8_t *cm;
  52   u16_t *km;
  53   int fd, n, fb;
  54
  55   if (argc != 2)
  56         usage();
  57
  58   if ((fd = open(argv[1], O_RDONLY)) < 0) fatal(argv[1]);
  59
  60   if (read(fd, comprmap, sizeof(comprmap)) < 0) fatal(argv[1]);
  61
  62   if (memcmp(comprmap, KEY_MAGIC, 4) != 0) {
  63         tell("loadkeys: ");
  64         tell(argv[1]);
  65         tell(": not a keymap file\n");
  66         exit(1);
  67   }
  68   close(fd);
  69
  70   /* Decompress the keymap data. */
  71   cm = comprmap + 4;
  72   n = 8;
  73   for (km = keymap; km < keymap + NR_SCAN_CODES * MAP_COLS; km++) {
  74         if (n == 8) {
  75                 /* Need a new flag byte. */
  76                 fb = *cm++;
  77                 n = 0;
  78         }
  79         *km = *cm++;                    /* Low byte. */
  80         if (fb & (1 << n)) {
  81                 *km |= (*cm++ << 8);    /* One of the few special keys. */
  82         }
  83         n++;
  84   }
  85
  86   if ((fd = open(KBD_DEVICE, O_WRONLY)) < 0) fatal(KBD_DEVICE);
  87
  88   if (ioctl(fd, KIOCSMAP, keymap) < 0) fatal(KBD_DEVICE);
  89
  90   return 0;
  91 }