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51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* bb_xparse_number implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <assert.h>
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#include "libbb.h"
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unsigned long bb_xparse_number(const char *numstr,
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const struct suffix_mult *suffixes)
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{
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unsigned long int r;
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char *e;
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int old_errno;
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/* Since this is a lib function, we're not allowed to reset errno to 0.
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* Doing so could break an app that is deferring checking of errno.
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* So, save the old value so that we can restore it if successful. */
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old_errno = errno;
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errno = 0;
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r = strtoul(numstr, &e, 10);
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if ((numstr != e) && !errno) {
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errno = old_errno; /* Ok. So restore errno. */
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if (!*e) {
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return r;
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}
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if (suffixes) {
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assert(suffixes->suffix); /* No nul suffixes. */
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do {
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if (strcmp(suffixes->suffix, e) == 0) {
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if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
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break;
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}
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return r * suffixes->mult;
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}
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++suffixes;
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} while (suffixes->suffix);
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}
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}
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bb_error_msg_and_die("invalid number `%s'", numstr);
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}
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