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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/stdio/stdio.h"
#include "libc/str/str.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 o, t = -1;
while (0 <= (o = getchar()) && o <= 255) {
if (!isxdigit(o)) continue;
int h = hextoint(o);
if (t != -1) putchar(t * 16 + h), h = -1;
t = h;
}
if (ferror(stdout)) return 1;
if (t != -1) return 2;
return 0;
}