sbase/sponge.c

/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

#include "util.h"

static void
usage(void)
{
	eprintf("usage: %s file\n", argv0);
}

int
main(int argc, char *argv[])
{
	char tmp[] = "/tmp/sponge-XXXXXX";
	int fd, tmpfd;

	argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;

	if (argc != 1)
		usage();

	if ((tmpfd = mkstemp(tmp)) < 0)
		eprintf("mkstemp:");
	unlink(tmp);
	if (concat(0, "<stdin>", tmpfd, "<tmpfile>") < 0)
		return 1;
	if (lseek(tmpfd, 0, SEEK_SET) < 0)
		eprintf("lseek:");

	if ((fd = creat(argv[0], 0666)) < 0)
		eprintf("creat %s:", argv[0]);
	if (concat(tmpfd, "<tmpfile>", fd, argv[0]) < 0)
		return 1;

	return 0;
}