src/mfmt.c

   1 /* mfmt: sets bold and underline for mail files */
   2 /* (c) 1995 miguel de icaza */
   3
   4 #include <stdio.h>
   5
   6 enum states {
   7     header,
   8     definition,
   9     plain,
  10     newline,
  11     seen_f,
  12     seen_r,
  13     seen_o,
  14     header_new,
  15     seen_m
  16 };
  17
  18 int
  19 main (void)
  20 {
  21     int c;
  22     int state = newline;
  23     int space_seen = 0;
  24
  25     while ((c = getchar ()) != EOF){
  26         switch (state){
  27         case plain:
  28             if (c == '\n')
  29                 state = newline;
  30             putchar (c);
  31             break;
  32
  33         case newline:
  34             if (c == 'F')
  35                 state = seen_f;
  36             else if (c == '\n')
  37                 putchar ('\n');
  38             else {
  39                 state = plain;
  40                 putchar (c);
  41             }
  42             break;
  43
  44         case seen_f:
  45             if (c == 'r')
  46                 state = seen_r;
  47             else {
  48                 printf ("F%c", c);
  49                 state = plain;
  50             }
  51             break;
  52
  53         case seen_r:
  54             if (c == 'o')
  55                 state = seen_o;
  56             else {
  57                 state = plain;
  58                 printf ("Fr%c", c);
  59             }
  60             break;
  61
  62         case seen_o:
  63             if (c == 'm'){
  64                 state = seen_m;
  65             } else {
  66                 state = plain;
  67                 printf ("Fro%c", c);
  68             }
  69             break;
  70
  71         case seen_m:
  72             if (c == ' '){
  73                 state = definition;
  74                 printf ("_\bF_\br_\bo_\bm ");
  75             } else {
  76                 state = plain;
  77                 printf ("From%c", c);
  78             }
  79             break;
  80
  81         case header_new:
  82             space_seen = 0;
  83             if (c == ' ' || c == '\t') {
  84                 state = definition;
  85                 putchar (c);
  86                 break;
  87             }
  88             if (c == '\n'){
  89                 state = plain;
  90                 putchar (c);
  91                 break;
  92             }
  93
  94         case header:
  95             if (c == '\n'){
  96                 putchar (c);
  97                 state = header_new;
  98                 break;
  99             }
 100             printf ("_\b%c", c);
 101             if (c == ' ')
 102                 space_seen = 1;
 103             if (c == ':' && !space_seen)
 104                 state = definition;
 105             break;
 106
 107         case definition:
 108             if (c == '\n'){
 109                 putchar (c);
 110                 state = header_new;
 111                 break;
 112             }
 113             printf ("%c\b%c", c, c);
 114             break;
 115         }
 116     }
 117     return (0);
 118 }