src/mfmt.c

   1 /* mfmt: sets bold and underline for mail files
   2    (c) 1995 miguel de icaza
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  */
  18
  19 #include <stdio.h>
  20
  21 enum states {
  22     header,
  23     definition,
  24     plain,
  25     newline,
  26     seen_f,
  27     seen_r,
  28     seen_o,
  29     header_new,
  30     seen_m
  31 };
  32
  33 int
  34 main (void)
  35 {
  36     int c;
  37     int state = newline;
  38     int space_seen = 0;
  39
  40     while ((c = getchar ()) != EOF){
  41         switch (state){
  42         case plain:
  43             if (c == '\n')
  44                 state = newline;
  45             putchar (c);
  46             break;
  47
  48         case newline:
  49             if (c == 'F')
  50                 state = seen_f;
  51             else if (c == '\n')
  52                 putchar ('\n');
  53             else {
  54                 state = plain;
  55                 putchar (c);
  56             }
  57             break;
  58
  59         case seen_f:
  60             if (c == 'r')
  61                 state = seen_r;
  62             else {
  63                 printf ("F%c", c);
  64                 state = plain;
  65             }
  66             break;
  67
  68         case seen_r:
  69             if (c == 'o')
  70                 state = seen_o;
  71             else {
  72                 state = plain;
  73                 printf ("Fr%c", c);
  74             }
  75             break;
  76
  77         case seen_o:
  78             if (c == 'm'){
  79                 state = seen_m;
  80             } else {
  81                 state = plain;
  82                 printf ("Fro%c", c);
  83             }
  84             break;
  85
  86         case seen_m:
  87             if (c == ' '){
  88                 state = definition;
  89                 printf ("_\bF_\br_\bo_\bm ");
  90             } else {
  91                 state = plain;
  92                 printf ("From%c", c);
  93             }
  94             break;
  95
  96         case header_new:
  97             space_seen = 0;
  98             if (c == ' ' || c == '\t') {
  99                 state = definition;
 100                 putchar (c);
 101                 break;
 102             }
 103             if (c == '\n'){
 104                 state = plain;
 105                 putchar (c);
 106                 break;
 107             }
 108
 109         case header:
 110             if (c == '\n'){
 111                 putchar (c);
 112                 state = header_new;
 113                 break;
 114             }
 115             printf ("_\b%c", c);
 116             if (c == ' ')
 117                 space_seen = 1;
 118             if (c == ':' && !space_seen)
 119                 state = definition;
 120             break;
 121
 122         case definition:
 123             if (c == '\n'){
 124                 putchar (c);
 125                 state = header_new;
 126                 break;
 127             }
 128             printf ("%c\b%c", c, c);
 129             break;
 130         }
 131     }
 132     return (0);
 133 }