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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
static int show = 0x07;
static void
printline(int pos, char *line)
{
int i;
if (!(show & (0x1 << pos)))
return;
for (i = 0; i < pos; i++) {
if (show & (0x1 << i))
putchar('\t');
}
fputs(line, stdout);
}
static void
usage(void)
{
eprintf("usage: %s [-123] file1 file2\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp[2];
size_t linelen[2] = { 0, 0 };
int i, diff = 0;
char *line[2] = { NULL, NULL };
ARGBEGIN {
case '1':
case '2':
case '3':
show &= 0x07 ^ (1 << (ARGC() - '1'));
break;
default:
usage();
} ARGEND;
if (argc != 2)
usage();
for (i = 0; i < 2; i++) {
if (argv[i][0] == '-' && !argv[i][1]) {
argv[i] = "<stdin>";
fp[i] = stdin;
} else if (!(fp[i] = fopen(argv[i], "r"))) {
eprintf("fopen %s:", argv[i]);
}
}
for (;;) {
for (i = 0; i < 2; i++) {
if (diff && i == (diff < 0))
continue;
if (getline(&line[i], &linelen[i], fp[i]) > 0)
continue;
if (ferror(fp[i]))
eprintf("getline %s:", argv[i]);
if (diff && line[!i][0])
printline(!i, line[!i]);
while (getline(&line[!i], &linelen[!i], fp[!i]) > 0)
printline(!i, line[!i]);
if (ferror(fp[!i]))
eprintf("getline %s:", argv[!i]);
goto end;
}
diff = strcmp(line[0], line[1]);
LIMIT(diff, -1, 1);
printline((2 - diff) % 3, line[MAX(0, diff)]);
}
end:
return !!(fshut(fp[0], argv[0]) + (fp[0] != fp[1] && fshut(fp[1], argv[1])) +
fshut(stdout, "<stdout>"));
}