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#include <unistd.h> // ssize_t, read, write
#include <fcntl.h> // open, close, O_RDONLY, ...
#include <stdio.h> // perror
// exit 0 - equal
// exit 1 - different
int main(int argc, char* argv[]) {
int f1 = open(argv[1], O_RDONLY);
if (f1 < 0) {
perror("open");
return 2;
}
int f2 = open(argv[2], O_RDONLY);
if (f2 < 0) {
perror("open");
return 3;
}
char buf1, buf2;
ssize_t read1, read2;
do {
read1 = read(f1, &buf1, 1);
read2 = read(f2, &buf2, 1);
if (buf1 != buf2) return 1;
} while (read1 > 0 && read2 > 0);
if (read1 != read2) return 1;
close(f1);
close(f2);
}
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