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/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#include "libc/runtime/gc.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/x/x.h"
/**
* @fileoverview Hex to binary converter program.
* Non-hex bytes are ignored. If you've got imposter syndrome you could
* call this a compiler and start coding in hex.
*/
int main(int argc, char *argv[]) {
size_t i, j, l;
uint8_t *buf;
if (argc == 1) return 1;
buf = gc(xmalloc((l = strlen(argv[1]) / 2)));
for (j = 0; j < l; ++j) {
buf[j] = 0;
}
for (i = 1; i < argc; ++i) {
for (j = 0; j < l; ++j) {
buf[j] ^= hextoint(argv[i][j + 0]) << 4 | hextoint(argv[i][j + 1]);
}
}
for (j = 0; j < l; ++j) {
putchar("0123456789abcdef"[(buf[j] >> 4) & 0xf]);
putchar("0123456789abcdef"[(buf[j] >> 0) & 0xf]);
}
putchar('\n');
return 0;
}