map.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "roff.h"
   4
   5 static char keys[NREGS][GNLEN];
   6 static int nkeys;
   7
   8 /* map register names to [0..NREGS * 2) */
   9 int map(char *s)
  10 {
  11         int i;
  12         if (n_cp || !s[1] || !s[2])
  13                 return REG(s[0], s[1]);
  14         for (i = 0; i < nkeys; i++)
  15                 if (keys[i][0] == s[0] && !strcmp(keys[i], s))
  16                         return NREGS + i;
  17         strcpy(keys[nkeys++], s);
  18         return NREGS + nkeys - 1;
  19 }
  20
  21 /* returns a static buffer */
  22 char *map_name(int id)
  23 {
  24         static char map_buf[NMLEN];
  25         if (id >= NREGS)
  26                 return keys[id - NREGS];
  27         map_buf[0] = (id >> 8) & 0xff;
  28         map_buf[1] = id & 0xff;
  29         map_buf[2] = '\0';
  30         return map_buf;
  31 }