frob.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// included bc i use clang, remove if gcc.
// taken from
// https://github.com/lattera/glibc/blob/master/string/memfrob.c
void *memfrob(void *s, size_t n) {
  char *p = (char *)s;

  while (n-- > 0)
    *p++ ^= 42;

  return s;
}

int main(int argc, char *argv[]) {

  if (argc < 2) {
    printf("USAGE: %s string-to-frob\n", argv[0]);
    exit(27);
  }

  char *toFrob = argv[1];

  memfrob(toFrob, strlen(toFrob));

  printf("unsigned char frobbedString[%ld] = {", strlen(toFrob) + 1);
  do {
    printf("%d, ", *toFrob);
  } while (*(++toFrob));
  printf("42};\n"); // frobs to null

  return 0;
}

// example:
// > ./frob meow
// unsigned char frobbedString[5] = {71, 79, 69, 93, 42};