| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * bb_xparse_number implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 15 | * General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 20 | *
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| 21 | */
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| 22 |
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| 23 | #include <stdlib.h>
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| 24 | #include <string.h>
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| 25 | #include <limits.h>
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| 26 | #include <errno.h>
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| 27 | #include <assert.h>
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| 28 | #include "libbb.h"
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| 29 |
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| 30 | unsigned long bb_xparse_number(const char *numstr,
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| 31 | const struct suffix_mult *suffixes)
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| 32 | {
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| 33 | unsigned long int r;
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| 34 | char *e;
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| 35 | int old_errno;
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| 36 |
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| 37 | /* Since this is a lib function, we're not allowed to reset errno to 0.
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| 38 | * Doing so could break an app that is deferring checking of errno.
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| 39 | * So, save the old value so that we can restore it if successful. */
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| 40 | old_errno = errno;
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| 41 | errno = 0;
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| 42 | r = strtoul(numstr, &e, 10);
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| 43 |
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| 44 | if ((numstr != e) && !errno) {
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| 45 | errno = old_errno; /* Ok. So restore errno. */
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| 46 | if (!*e) {
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| 47 | return r;
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| 48 | }
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| 49 | if (suffixes) {
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| 50 | assert(suffixes->suffix); /* No nul suffixes. */
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| 51 | do {
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| 52 | if (strcmp(suffixes->suffix, e) == 0) {
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| 53 | if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
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| 54 | break;
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| 55 | }
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| 56 | return r * suffixes->mult;
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| 57 | }
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| 58 | ++suffixes;
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| 59 | } while (suffixes->suffix);
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| 60 | }
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| 61 | }
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| 62 | bb_error_msg_and_die("invalid number `%s'", numstr);
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| 63 | }
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