/* mkfiles: create files listed in namefile under dir, batch of batchsz
 * with a sync per batch (lets the flusher build indirect blocks
 * incrementally, producing nested INDIRECT topology). */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

int
main(int argc, char **argv)
{
	const char *dir = argv[1];
	const char *list = argv[2];
	int batch = argc > 3 ? atoi(argv[3]) : 512;
	char line[512], path[1024];
	FILE *f;
	int n = 0;

	if ((f = fopen(list, "r")) == NULL) { perror(list); exit(1); }
	while (fgets(line, sizeof(line), f)) {
		int len = strlen(line);
		char dat[64];
		int fd;
		if (len && line[len-1] == '\n') line[--len] = 0;
		if (len == 0) continue;
		snprintf(path, sizeof(path), "%s/%s", dir, line);
		fd = open(path, O_CREAT|O_RDWR|O_TRUNC, 0644);
		if (fd < 0) { perror(path); continue; }
		memset(dat, 'Z', sizeof(dat));
		write(fd, dat, sizeof(dat));
		close(fd);
		if (++n % batch == 0)
			sync();
	}
	fclose(f);
	fprintf(stderr, "created %d files\n", n);
	return 0;
}