191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2000 Sheldon Hearn <sheldonh@FreeBSD.org>.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif
|
|
|
|
#include <sys/stat.h>
|
|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include <libutil.h>
|
|
|
|
static void usage(void);
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct stat sb;
|
|
mode_t omode;
|
|
off_t oflow, rsize, sz, tsize, round;
|
|
uint64_t usz;
|
|
int ch, error, fd, oflags;
|
|
int no_create;
|
|
int do_relative;
|
|
int do_round;
|
|
int do_refer;
|
|
int got_size;
|
|
char *fname, *rname;
|
|
|
|
fd = -1;
|
|
rsize = tsize = sz = 0;
|
|
no_create = do_relative = do_round = do_refer = got_size = 0;
|
|
error = 0;
|
|
rname = NULL;
|
|
while ((ch = getopt(argc, argv, "cr:s:")) != -1)
|
|
switch (ch) {
|
|
case 'c':
|
|
no_create = 1;
|
|
break;
|
|
case 'r':
|
|
do_refer = 1;
|
|
rname = optarg;
|
|
break;
|
|
case 's':
|
|
if (*optarg == '+' || *optarg == '-') {
|
|
do_relative = 1;
|
|
} else if (*optarg == '%' || *optarg == '/') {
|
|
do_round = 1;
|
|
}
|
|
if (expand_number(do_relative || do_round ?
|
|
optarg + 1 : optarg,
|
|
&usz) == -1 || (off_t)usz < 0)
|
|
errx(EXIT_FAILURE,
|
|
"invalid size argument `%s'", optarg);
|
|
|
|
sz = (*optarg == '-' || *optarg == '/') ?
|
|
-(off_t)usz : (off_t)usz;
|
|
got_size = 1;
|
|
break;
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
argv += optind;
|
|
argc -= optind;
|
|
|
|
/*
|
|
* Exactly one of do_refer or got_size must be specified. Since
|
|
* do_relative implies got_size, do_relative and do_refer are
|
|
* also mutually exclusive. See usage() for allowed invocations.
|
|
*/
|
|
if (do_refer + got_size != 1 || argc < 1)
|
|
usage();
|
|
if (do_refer) {
|
|
if (stat(rname, &sb) == -1)
|
|
err(EXIT_FAILURE, "%s", rname);
|
|
tsize = sb.st_size;
|
|
} else if (do_relative || do_round)
|
|
rsize = sz;
|
|
else
|
|
tsize = sz;
|
|
|
|
if (no_create)
|
|
oflags = O_WRONLY;
|
|
else
|
|
oflags = O_WRONLY | O_CREAT;
|
|
omode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
|
|
|
|
while ((fname = *argv++) != NULL) {
|
|
if (fd != -1)
|
|
close(fd);
|
|
if ((fd = open(fname, oflags, omode)) == -1) {
|
|
if (errno != ENOENT) {
|
|
warn("%s", fname);
|
|
error++;
|
|
}
|
|
continue;
|
|
}
|
|
if (do_relative) {
|
|
if (fstat(fd, &sb) == -1) {
|
|
warn("%s", fname);
|
|
error++;
|
|
continue;
|
|
}
|
|
oflow = sb.st_size + rsize;
|
|
if (oflow < (sb.st_size + rsize)) {
|
|
errno = EFBIG;
|
|
warn("%s", fname);
|
|
error++;
|
|
continue;
|
|
}
|
|
tsize = oflow;
|
|
}
|
|
if (do_round) {
|
|
if (fstat(fd, &sb) == -1) {
|
|
warn("%s", fname);
|
|
error++;
|
|
continue;
|
|
}
|
|
sz = rsize;
|
|
if (sz < 0)
|
|
sz = -sz;
|
|
if (sb.st_size % sz) {
|
|
round = sb.st_size / sz;
|
|
if (round != sz && rsize < 0)
|
|
round--;
|
|
else if (rsize > 0)
|
|
round++;
|
|
tsize = (round < 0 ? 0 : round) * sz;
|
|
} else
|
|
tsize = sb.st_size;
|
|
}
|
|
if (tsize < 0)
|
|
tsize = 0;
|
|
|
|
if (ftruncate(fd, tsize) == -1) {
|
|
warn("%s", fname);
|
|
error++;
|
|
continue;
|
|
}
|
|
}
|
|
if (fd != -1)
|
|
close(fd);
|
|
|
|
return error ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "%s\n%s\n",
|
|
"usage: truncate [-c] -s [+|-|%|/]size[K|k|M|m|G|g|T|t] file ...",
|
|
" truncate [-c] -r rfile file ...");
|
|
exit(EXIT_FAILURE);
|
|
}
|