fluffy/xor.c

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/*
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* xor filter -- 2020 Neale Pickett <neale@woozle.org>
*
* This file is in the public domain. I make no promises about the functionality
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* of this program.
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*/
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
int main(int argc, char* argv[]) {
int radix = 10;
int arg;
int c;
while ((c = getopt(argc, argv, "a")) != -1) {
switch (c) {
case 'x':
radix = 16;
break;
default:
fprintf(stderr, "Usage: %s [-x] m1 [m2 ...]\n", argv[0]);
return 1;
}
}
if (!argv[optind]) {
return 1;
}
arg = optind;
while (1) {
int c = getchar();
unsigned char mask;
if (!argv[arg]) {
arg = optind;
}
mask = strtol(argv[arg++], NULL, radix);
if (EOF == c) {
break;
}
c ^= mask;
putchar(c);
}
return 0;
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}