src/tiff/contrib/mac-mpw/mactrans.c

   1 /*
   2  *  mactrans.c  -- Hack filter used to generate MPW files
   3  *    with special characters from pure ASCII, denoted "%nn"
   4  *    where nn is hex. (except for "%%", which is literal '%').
   5  *
   6  *  calling sequence:
   7  *
   8  *    catenate file | mactrans [-toascii | -fromascii] > output
   9  *
  10  *    Written by: Niles Ritter.
  11  */
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <ctype.h>
  15
  16 void to_ascii(void);
  17 void from_ascii(void);
  18
  19 main(int argc, char *argv[])
  20 {
  21         if (argc<2 || argv[1][1]=='f') from_ascii();
  22         else to_ascii();
  23         exit (0);
  24 }
  25
  26 void from_ascii(void)
  27 {
  28     char c;
  29     int d;
  30     while ((c=getchar())!=EOF)
  31     {
  32         if (c!='%' || (c=getchar())=='%') putchar(c);
  33         else
  34         {
  35                 ungetc(c,stdin);
  36                 scanf("%2x",&d);
  37                 *((unsigned char *)&c) = d;
  38                 putchar(c);
  39         }
  40     }
  41 }
  42
  43 void to_ascii(void)
  44 {
  45     char c;
  46     int d;
  47     while ((c=getchar())!=EOF)
  48     {
  49         if (isascii(c)) putchar (c);
  50         else
  51         {
  52                 d = *((unsigned char *)&c);
  53                 printf("%%%2x",d);
  54         }
  55     }
  56 }