sys/src/cmd/tbl/tc.c

   1 /* tc.c: find character not in table to delimit fields */
   2 # include "t.h"
   3
   4 # define COMMON "\002\003\005\006\007!%&#/?,:;<=>@`^~_{}+-*" \
   5         "ABCDEFGHIJKMNOPQRSTUVWXZabcdefgjkoqrstwxyz"
   6
   7 void
   8 choochar(void)
   9 {
  10                                 /* choose funny characters to delimit fields */
  11         int     had[128], ilin, icol, k;
  12         char    *s;
  13
  14         for (icol = 0; icol < 128; icol++)
  15                 had[icol] = 0;
  16         F1 = F2 = 0;
  17         for (ilin = 0; ilin < nlin; ilin++) {
  18                 if (instead[ilin] || fullbot[ilin])
  19                         continue;
  20                 for (icol = 0; icol < ncol; icol++) {
  21                         k = ctype(ilin, icol);
  22                         if (k == 0 || k == '-' || k == '=')
  23                                 continue;
  24                         s = table[ilin][icol].col;
  25                         if (point(s))
  26                                 for (; *s; s++)
  27                                         if((unsigned char)*s < 128)
  28                                                 had[(unsigned char)*s] = 1;
  29                         s = table[ilin][icol].rcol;
  30                         if (point(s))
  31                                 for (; *s; s++)
  32                                         if((unsigned char)*s < 128)
  33                                                 had[(unsigned char)*s] = 1;
  34                 }
  35         }
  36                                 /* choose first funny character */
  37         for (s = COMMON "Y"; *s; s++) {
  38                 if (had[*s] == 0) {
  39                         F1 = *s;
  40                         had[F1] = 1;
  41                         break;
  42                 }
  43         }
  44                                 /* choose second funny character */
  45         for (s = COMMON "u"; *s; s++) {
  46                 if (had[*s] == 0) {
  47                         F2 = *s;
  48                         break;
  49                 }
  50         }
  51         if (F1 == 0 || F2 == 0)
  52                 error("couldn't find characters to use for delimiters");
  53 }
  54
  55 int
  56 point(char *ss)
  57 {
  58         vlong s = (uintptr)ss;
  59
  60         return(s >= 128 || s < 0);
  61 }