diff options
Diffstat (limited to 'busybox/libbb/parse_number.c')
-rw-r--r-- | busybox/libbb/parse_number.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/busybox/libbb/parse_number.c b/busybox/libbb/parse_number.c new file mode 100644 index 000000000..5262239ff --- /dev/null +++ b/busybox/libbb/parse_number.c | |||
@@ -0,0 +1,64 @@ | |||
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 | |||
30 | extern | ||
31 | unsigned long bb_xparse_number(const char *numstr, | ||
32 | const struct suffix_mult *suffixes) | ||
33 | { | ||
34 | unsigned long int r; | ||
35 | char *e; | ||
36 | int old_errno; | ||
37 | |||
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. */ | ||
41 | old_errno = errno; | ||
42 | errno = 0; | ||
43 | r = strtoul(numstr, &e, 10); | ||
44 | |||
45 | if ((numstr != e) && !errno) { | ||
46 | errno = old_errno; /* Ok. So restore errno. */ | ||
47 | if (!*e) { | ||
48 | return r; | ||
49 | } | ||
50 | if (suffixes) { | ||
51 | assert(suffixes->suffix); /* No nul suffixes. */ | ||
52 | do { | ||
53 | if (strcmp(suffixes->suffix, e) == 0) { | ||
54 | if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */ | ||
55 | break; | ||
56 | } | ||
57 | return r * suffixes->mult; | ||
58 | } | ||
59 | ++suffixes; | ||
60 | } while (suffixes->suffix); | ||
61 | } | ||
62 | } | ||
63 | bb_error_msg_and_die("invalid number `%s'", numstr); | ||
64 | } | ||