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Linksys backup format to text convertor

/ Published in: C++
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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <ctype.h>
  4.  
  5. int decode(unsigned char);
  6.  
  7. int decode(unsigned char ch) {
  8.  ch = ~((ch << 2) | ((ch & 0xC0) >> 6));
  9.  if (ch) {
  10.   if (isprint(ch)) {
  11.    return ch;
  12.   } else {
  13.     return ' ';
  14.   }
  15.  }
  16.  return '\n';
  17. }    
  18.  
  19. int main(int argc, char *argv[]) {
  20. int ch;
  21. FILE *fp;
  22.  
  23.  if (argc < 2) {
  24.   fp = stdin;
  25.   } else {
  26.    if (NULL == (fp = fopen(argv[1], "r"))) {
  27.      fprintf(stderr, "Error: Cannot open file %s\n", argv[1]);
  28.      exit(EXIT_FAILURE);
  29.     }
  30.   }
  31.  
  32.  while (EOF != (ch =fgetc(fp))) {
  33.   fputc(decode(ch), stdout);
  34.  }
  35.  return EXIT_SUCCESS;
  36. }
  37.  

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