fuzz.c

   1 /* fuzz - print many unicode chars to the terminal.
   2  *
   3  * This program will print every 4-byte combination to the
   4  * terminal (though, of course, this could take a *long* time...)
   5  *
   6  * Copyright (C) 2017 Ethan McTague
   7  * Email <ethan@tague.me> for more information.
   8  * Licensed under the BSD license - see LICENSE.
   9  */
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13 void fuzz(const char* before, int num);
  14 void help(const char* progName);
  15 void version();
  16 void badArgs(const char* progName);
  17 void readArgs(int argc, char* argv[], int* showHelp, int* showVersion, int* runFuzz);
  18
  19 int main (int argc, char* argv[]) {
  20   int showHelp = 0;
  21   int showVersion = 0;
  22   int runFuzz = 0;
  23   readArgs(argc, argv, &showHelp, &showVersion, &runFuzz);
  24
  25   if (showHelp) help(argv[0]);
  26   else if (showVersion) version();
  27   else if (runFuzz) fuzz("", 4);
  28   else badArgs(argv[0]);
  29   return 0;
  30 }
  31
  32 void fuzz(const char* before, int num) {
  33   for (int ch = 0; ch < 0x7FFFFFF; ch++) {
  34     int size = num + strlen(before) + 1;
  35     char buffer[size];
  36     snprintf(buffer, size, "%s%c", before, ch);
  37     if (num > 0) fuzz(buffer, num - 1);
  38     else printf("%s", buffer);
  39   }
  40 }
  41
  42 void help(const char* progName) {
  43   puts("fuzzer: print many unicode chars to the terminal.");
  44   puts("Pipe output to another program to test its input handling.");
  45   puts("");
  46   printf("Usage: %s [options]\n", progName);
  47   puts("Options:");
  48   puts(" --help     Print this help screen.");
  49   puts(" --version  Print version information.");
  50   puts(" --fuzz     Run the Fuzzer.");
  51   puts("");
  52   puts("Copyright (C) 2017 Ethan McTague");
  53   puts("Email <ethan@tague.me> for more information.");
  54 }
  55
  56 void version() {
  57   puts("fuzzer 0.0.1");
  58   puts("By Ethan McTague");
  59 }
  60
  61 void badArgs(const char* progName) {
  62   printf("Bad arguments. Run '%s --help' to learn how to use fuzzer.\n", progName);
  63 }
  64
  65 void readArgs(int argc, char* argv[], int* showHelp, int* showVersion, int* runFuzz) {
  66   for (int i = 1; i < argc; i++) {
  67     if (!strcmp(argv[i], "--help")) {
  68       *showHelp = 1;
  69       return;
  70     } else if (!strcmp(argv[i], "--version")) {
  71       *showVersion = 1;
  72       return;
  73     } else if (!strcmp(argv[i], "--fuzz")) {
  74       *runFuzz = 1;
  75       return;
  76     }
  77   }
  78 }