1 /* vi: set sw=4 ts=4: */
3 * bb_xparse_number implementation for busybox
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 unsigned long bb_xparse_number(const char *numstr,
32 const struct suffix_mult *suffixes)
38 /* Since this is a lib function, we're not allowed to reset errno to 0.
39 * Doing so could break an app that is deferring checking of errno.
40 * So, save the old value so that we can restore it if successful. */
43 r = strtoul(numstr, &e, 10);
45 if ((numstr != e) && !errno) {
46 errno = old_errno; /* Ok. So restore errno. */
51 assert(suffixes->suffix); /* No nul suffixes. */
53 if (strcmp(suffixes->suffix, e) == 0) {
54 if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
57 return r * suffixes->mult;
60 } while (suffixes->suffix);
63 bb_error_msg_and_die("invalid number `%s'", numstr);