mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-05 03:39:02 +00:00
208 lines
4.6 KiB
C
208 lines
4.6 KiB
C
/*
|
|
* 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>
|
|
|
|
static off_t parselength(char *, off_t *);
|
|
static void usage(void);
|
|
|
|
static int no_create;
|
|
static int do_relative;
|
|
static int do_refer;
|
|
static int got_size;
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
struct stat sb;
|
|
mode_t omode;
|
|
off_t oflow, rsize, sz, tsize;
|
|
int ch, error, fd, oflags;
|
|
char *fname, *rname;
|
|
|
|
rsize = tsize = 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 (parselength(optarg, &sz) == -1)
|
|
errx(EXIT_FAILURE,
|
|
"invalid size argument `%s'", optarg);
|
|
if (*optarg == '+' || *optarg == '-')
|
|
do_relative = 1;
|
|
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)
|
|
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 = 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 (tsize < 0)
|
|
tsize = 0;
|
|
|
|
if (ftruncate(fd, tsize) == -1) {
|
|
warn("%s", fname);
|
|
error++;
|
|
continue;
|
|
}
|
|
|
|
close(fd);
|
|
}
|
|
|
|
return error ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Return the numeric value of a string given in the form [+-][0-9]+[GMK]
|
|
* or -1 on format error or overflow.
|
|
*/
|
|
static off_t
|
|
parselength(char *ls, off_t *sz)
|
|
{
|
|
off_t length, oflow;
|
|
int lsign;
|
|
|
|
length = 0;
|
|
lsign = 1;
|
|
|
|
switch (*ls) {
|
|
case '-':
|
|
lsign = -1;
|
|
case '+':
|
|
ls++;
|
|
}
|
|
|
|
#define ASSIGN_CHK_OFLOW(x, y) if (x < y) return -1; y = x
|
|
/*
|
|
* Calculate the value of the decimal digit string, failing
|
|
* on overflow.
|
|
*/
|
|
while (isdigit(*ls)) {
|
|
oflow = length * 10 + *ls++ - '0';
|
|
ASSIGN_CHK_OFLOW(oflow, length);
|
|
}
|
|
|
|
switch (*ls) {
|
|
case 'G':
|
|
oflow = length * 1024;
|
|
ASSIGN_CHK_OFLOW(oflow, length);
|
|
case 'M':
|
|
oflow = length * 1024;
|
|
ASSIGN_CHK_OFLOW(oflow, length);
|
|
case 'K':
|
|
if (ls[1] != '\0')
|
|
return -1;
|
|
oflow = length * 1024;
|
|
ASSIGN_CHK_OFLOW(oflow, length);
|
|
case '\0':
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
*sz = length * lsign;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "%s\n%s\n",
|
|
"usage: truncate [-c] -s [+|-]size[K|M|G] file ...",
|
|
" truncate [-c] -r rfile file ...");
|
|
exit(EXIT_FAILURE);
|
|
}
|