2 * Copyright (c) 2000 Sheldon Hearn <sheldonh@FreeBSD.org>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 static const char rcsid[] =
43 static int parselength(char *, off_t *);
44 static void usage(void);
47 static int do_relative;
52 main(int argc, char **argv)
56 off_t oflow, rsize, sz, tsize;
57 int ch, error, fd, oflags;
61 rsize = tsize = sz = 0;
64 while ((ch = getopt(argc, argv, "cr:s:")) != -1)
74 if (parselength(optarg, &sz) == -1)
76 "invalid size argument `%s'", optarg);
77 if (*optarg == '+' || *optarg == '-')
90 * Exactly one of do_refer or got_size must be specified. Since
91 * do_relative implies got_size, do_relative and do_refer are
92 * also mutually exclusive. See usage() for allowed invocations.
94 if (do_refer + got_size != 1 || argc < 1)
97 if (stat(rname, &sb) == -1)
98 err(EXIT_FAILURE, "%s", rname);
100 } else if (do_relative)
108 oflags = O_WRONLY | O_CREAT;
109 omode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
111 while ((fname = *argv++) != NULL) {
114 if ((fd = open(fname, oflags, omode)) == -1) {
115 if (errno != ENOENT) {
122 if (fstat(fd, &sb) == -1) {
127 oflow = sb.st_size + rsize;
128 if (oflow < (sb.st_size + rsize)) {
139 if (ftruncate(fd, tsize) == -1) {
148 return error ? EXIT_FAILURE : EXIT_SUCCESS;
152 * Return the numeric value of a string given in the form [+-][0-9]+[GMKT]
153 * or -1 on format error or overflow.
156 parselength(char *ls, off_t *sz)
171 #define ASSIGN_CHK_OFLOW(x, y) if (x < y) return -1; y = x
173 * Calculate the value of the decimal digit string, failing
176 while (isdigit(*ls)) {
177 oflow = length * 10 + *ls++ - '0';
178 ASSIGN_CHK_OFLOW(oflow, length);
184 oflow = length * 1024;
185 ASSIGN_CHK_OFLOW(oflow, length);
188 oflow = length * 1024;
189 ASSIGN_CHK_OFLOW(oflow, length);
192 oflow = length * 1024;
193 ASSIGN_CHK_OFLOW(oflow, length);
198 oflow = length * 1024;
199 ASSIGN_CHK_OFLOW(oflow, length);
206 *sz = length * lsign;
213 fprintf(stderr, "%s\n%s\n",
214 "usage: truncate [-c] -s [+|-]size[K|k|M|m|G|g|T|t] file ...",
215 " truncate [-c] -r rfile file ...");