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#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <err.h>
int
main(int argc, char *argv[])
{
if (argc < 2)
errx(EXIT_FAILURE, "usage: %s hex ... < input > output", argv[0]);
uint8_t buf[4096];
for (size_t ret, c = 0; (ret = fread(buf, 1, sizeof(buf), stdin)) > 0;) {
for (size_t i = 0; i < ret; ++i, c = (c + 1) % (argc - 1))
buf[i] ^= strtoull(argv[c + 1], 0, 16);
fwrite(buf, 1, ret, stdout);
}
return EXIT_SUCCESS;
}
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