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