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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. void usage(char *);
  6. void enshirt(char *);
  7. void deshirt(char *);
  8.  
  9. const char table[16] = {0x1f, 0x07, 0x09, 0x01, 0x0b, 0x02, 0x05, 0x05, 0x03,
  10.                         0x11, 0x28, 0x0c, 0x23, 0x16, 0x1b, 0x02};
  11.  
  12. int
  13. main(int argc, char *argv[])
  14. {
  15.         if (argc < 3) 
  16.                 usage(argv[0]);
  17.  
  18.         if (strncmp(argv[1], "-e", 2) == 0)
  19.                 enshirt(argv[2]);
  20.         else if (strncmp(argv[1], "-d", 2) == 0)
  21.                 deshirt(argv[2]);
  22.         else
  23.                 usage(argv[0]);
  24.  
  25.         exit(0);
  26. }
  27.  
  28. void usage(char *progname)
  29. {
  30.         printf("Usage: ./%s [-e] [-d] filename\n", progname);
  31.         exit(1);
  32. }
  33.  
  34. void deshirt(char *filename)
  35. {
  36.         int i;
  37.         char cp, *line;
  38.         FILE *fp;
  39.  
  40.         if ((fp = fopen(filename, "r")) == NULL) {
  41.                 printf("Unable to open: %s\n", filename);
  42.                 exit(1);
  43.         }
  44.  
  45.         fgets(line, 10, fp);
  46.  
  47.         if (strncmp(line, "redshirt2", 9) == 0) {
  48.                 fseek(fp, 9L, SEEK_SET);
  49.         } else {
  50.                 printf("Error: Not a redshirt2 file\n");
  51.                 exit(1);
  52.         }
  53.  
  54.         while (cp != EOF) {
  55.                 cp = fgetc(fp);
  56.                 if (cp > 0x20) {
  57.                         i++;
  58.                         i %= 16;
  59.                         cp -= table[i];
  60.  
  61.                         if (cp < 0x20)
  62.                                 cp += 0x5f;
  63.                 }
  64.                 printf("%c", cp);
  65.         }
  66.  
  67.         return;
  68. }
  69.  
  70. void enshirt(char *filename)
  71. {
  72.         int i;
  73.         char cp;
  74.         FILE *fp;
  75.  
  76.         if ((fp = fopen(filename, "r")) == NULL) {
  77.                 printf("Unable to open: %s\n", filename);
  78.                 exit(1);
  79.         }
  80.  
  81.         printf("redshirt2");
  82.  
  83.         while (cp != EOF) {
  84.                 cp = fgetc(fp);
  85.                 if (cp > 0x20) {
  86.                         i++;
  87.                         i %= 16;
  88.                         cp += table[i];
  89.  
  90.                         if (cp < 0x20)
  91.                                 cp -= 0x5f;
  92.                 }
  93.                 printf("%c", cp);
  94.         }
  95.  
  96.         return;
  97. }
  98.  
Runtime error #stdin #stdout 0s 3412KB
comments (?)
stdin
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Standard input is empty
stdout
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Usage: ././prog [-e] [-d] filename
https://ideone.com/5ecO3G
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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