/* xor.c -- XOR two files together and get a third -- by glenn (1995-05-11) */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main( int argc , char *argv[] )
{
FILE *in1, *in2, *out;
int ch1;
int ch2;
/* Silly Error Checking Stuff */
if (argc < 3 )
{
fprintf (stderr, "Usage: %s input-file-1 input-file-2 output-file\n", argv[0]);
exit(1);
}
if (((in1 = fopen(argv[1], "r")) == NULL ) || ((in2 = fopen(argv[2], "r")) == NULL ) || ((out = fopen(argv[3], "w")) == NULL))
{
fprintf(stderr, "Error opening files.\n");
exit(2);
}
/* End of Silly Error Checking Stuff */
while (((ch1 = getc(in1)) != EOF) && ((ch2 = getc(in2)) != EOF))
putc(ch1^ch2, out);
/* More Error Checking Stuff and THE END */
if (fclose(in1) !=0 || fclose(in2) || fclose(out) !=0)
fprintf(stderr,"Error closing files\n");
return 0;
}