mirror of
https://github.com/sheumann/hush.git
synced 2024-12-22 14:30:31 +00:00
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* bb_xparse_number implementation for busybox
|
|
*
|
|
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include "libbb.h"
|
|
|
|
extern
|
|
unsigned long bb_xparse_number(const char *numstr,
|
|
const struct suffix_mult *suffixes)
|
|
{
|
|
unsigned long int r;
|
|
char *e;
|
|
int old_errno;
|
|
|
|
/* Since this is a lib function, we're not allowed to reset errno to 0.
|
|
* Doing so could break an app that is deferring checking of errno.
|
|
* So, save the old value so that we can restore it if successful. */
|
|
old_errno = errno;
|
|
errno = 0;
|
|
r = strtoul(numstr, &e, 10);
|
|
|
|
if ((numstr != e) && !errno) {
|
|
errno = old_errno; /* Ok. So restore errno. */
|
|
if (!*e) {
|
|
return r;
|
|
}
|
|
if (suffixes) {
|
|
assert(suffixes->suffix); /* No nul suffixes. */
|
|
do {
|
|
if (strcmp(suffixes->suffix, e) == 0) {
|
|
if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
|
|
break;
|
|
}
|
|
return r * suffixes->mult;
|
|
}
|
|
++suffixes;
|
|
} while (suffixes->suffix);
|
|
}
|
|
}
|
|
bb_error_msg_and_die("invalid number `%s'", numstr);
|
|
}
|