libite 2.6.1
truncatef.c
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1/* Formatted truncate()
2 *
3 * Copyright (c) 2021 Joachim Wiberg <troglobit@gmail.com>
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
24
25#include <errno.h>
26#include <stdio.h>
27#include <stdarg.h>
28#include <stdlib.h>
29#include <unistd.h>
30
42int truncatef(off_t length, const char *fmt, ...)
43{
44 va_list ap;
45 char *file;
46 int len;
47
48 va_start(ap, fmt);
49 len = vsnprintf(NULL, 0, fmt, ap);
50 va_end(ap);
51
52 file = alloca(len + 1);
53 if (!file) {
54 errno = ENOMEM;
55 return -1;
56 }
57
58 va_start(ap, fmt);
59 vsnprintf(file, len + 1, fmt, ap);
60 va_end(ap);
61
62 return truncate(file, length);
63}
64
int truncatef(off_t length, const char *fmt,...)
Definition truncatef.c:42