Function safe_append

sequencer.c:3907–3942

}

__attribute__((format (printf, 2, 3)))
static int safe_append(const char *filename, const char *fmt, ...)
{
	va_list ap;
	struct lock_file lock = LOCK_INIT;
	int fd = hold_lock_file_for_update(&lock, filename,
					   LOCK_REPORT_ON_ERROR);
	struct strbuf buf = STRBUF_INIT;

	if (fd < 0)
		return -1;

	if (strbuf_read_file(&buf, filename, 0) < 0 && errno != ENOENT) {
		error_errno(_("could not read '%s'"), filename);
		rollback_lock_file(&lock);
		return -1;
	}
	strbuf_complete(&buf, '\n');
	va_start(ap, fmt);
	strbuf_vaddf(&buf, fmt, ap);
	va_end(ap);

	if (write_in_full(fd, buf.buf, buf.len) < 0) {
		error_errno(_("could not write to '%s'"), filename);
		strbuf_release(&buf);
		rollback_lock_file(&lock);
		return -1;
	}
	if (commit_lock_file(&lock) < 0) {
		strbuf_release(&buf);
		return error(_("failed to finalize '%s'"), filename);
	}

	strbuf_release(&buf);
	return 0;
}

static int do_label(struct repository *r, const char *name, int len)
{