source: branches/2.2.2/mindi-busybox/libbb/parse_number.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * bb_xparse_number implementation for busybox
4 *
5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
6 *
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.
11 *
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.
16 *
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
20 *
21 */
22
23#include <stdlib.h>
24#include <string.h>
25#include <limits.h>
26#include <errno.h>
27#include <assert.h>
28#include "libbb.h"
29
30unsigned long bb_xparse_number(const char *numstr,
31                               const struct suffix_mult *suffixes)
32{
33    unsigned long int r;
34    char *e;
35    int old_errno;
36
37    /* Since this is a lib function, we're not allowed to reset errno to 0.
38     * Doing so could break an app that is deferring checking of errno.
39     * So, save the old value so that we can restore it if successful. */
40    old_errno = errno;
41    errno = 0;
42    r = strtoul(numstr, &e, 10);
43
44    if ((numstr != e) && !errno) {
45        errno = old_errno;  /* Ok.  So restore errno. */
46        if (!*e) {
47            return r;
48        }
49        if (suffixes) {
50            assert(suffixes->suffix);   /* No nul suffixes. */
51            do {
52                if (strcmp(suffixes->suffix, e) == 0) {
53                    if (ULONG_MAX / suffixes->mult < r) {   /* Overflow! */
54                        break;
55                    }
56                    return r * suffixes->mult;
57                }
58                ++suffixes;
59            } while (suffixes->suffix);
60        }
61    }
62    bb_error_msg_and_die("invalid number `%s'", numstr);
63}
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