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   1 /* cbmcvt.c --  PetSCII <--> ISO-8859-1 Conversion Filter Tool */
   2 /* 2010-09-06, Greg King */
   3
   4 #include <stdio.h>
   5 #include <unistd.h>
   6
   7 /* Translation table ISO-8859-1 -> PetSCII */
   8 static const unsigned char CTPET[256] = {
   9     0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x14,0x09,0x0D,0x11,0x93,0x0A,0x0E,0x0F,
  10     0x10,0x0B,0x12,0x13,0x08,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
  11     0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2A,0x2B,0x2C,0x2D,0x2E,0x2F,
  12     0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,
  13     0x40,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,
  14     0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0x5B,0xBF,0x5D,0x5E,0xA4,
  15     0xAD,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4A,0x4B,0x4C,0x4D,0x4E,0x4F,
  16     0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5A,0xB3,0xDD,0xAB,0xB1,0xDF,
  17     0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,
  18     0x90,0x91,0x92,0x0C,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,
  19     0xA0,0xA1,0xA2,0xA3,0x5F,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0x7D,0xAC,0x60,0xAE,0xAF,
  20     0xB0,0x7E,0xB2,0x7B,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0x5C,
  21     0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6A,0x6B,0x6C,0x6D,0x6E,0x6F,
  22     0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x7B,0xDC,0x7C,0xDE,0x7F,
  23     0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,
  24     0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF
  25 };
  26
  27 static unsigned char CTISO[256];
  28
  29
  30 int main (int argc, char *argv[]) {
  31     int C;
  32     size_t I = 0u;
  33
  34     if (isatty(fileno(stdin))) {
  35         fputs("cbmcvt v2.1 -- Conversion Filter (stdin --> stdout)\n"
  36               " -p  converts ISO-8859-1 to PetSCII\n"
  37               " else, converts in other direction.\n", stderr);
  38         return 0;
  39         }
  40     if (argc > 1 && argv[1][0] == '-' && argv[1][1] == 'p') {
  41         while ((C = fgetc (stdin)) != EOF) {
  42             fputc (CTPET[C], stdout);
  43         }
  44     } else {
  45         /* Create translation table PetSCII -> ISO-8859-1 */
  46         for (; I < sizeof CTPET; ++I) {
  47             CTISO[CTPET[I]] = I;
  48         }
  49
  50         while ((C = fgetc (stdin)) != EOF) {
  51             fputc (CTISO[C], stdout);
  52         }
  53     }
  54     return 0;
  55 }