/*
 * Check for directory offsets that are not monotonically increasing.
 */
#include <stdio.h>
#include <dirent.h>
#include <err.h>
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
	DIR *dirp;
	struct dirent *dent;
	off_t oldoff;
	int c;
	bool verbose;

	verbose = false;
	while ((c = getopt(argc, argv, "v")) != -1)
	switch (c) {
	case 'v':
		verbose = true;
		break;
	default:
		errx(1, "Usage: rdir [-v] <directory>");
	}
	argc -= optind;
	argv += optind;
	if (argc != 1)
		errx(1, "Usage: rdir [-v] <directory>");
	dirp = opendir(argv[0]);
	if (dirp == NULL)
		errx(1, "Cannot open %s", argv[1]);
	oldoff = 0;
	while ((dent = readdir(dirp)) != NULL) {
		if (verbose)
			printf("%jd\n", (intmax_t)dent->d_off);
		if (dent->d_off <= oldoff) {
			printf("Not monotonically increasing\n");
			exit(0);
		}
		oldoff = dent->d_off;
	}
}