161 lines
4.0 KiB
C
161 lines
4.0 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* xgetularg* implementations 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 <ctype.h>
|
|
#include <errno.h>
|
|
#include <assert.h>
|
|
#include "libbb.h"
|
|
|
|
#ifdef L_xgetularg_bnd_sfx
|
|
extern
|
|
unsigned long bb_xgetularg_bnd_sfx(const char *arg, int base,
|
|
unsigned long lower,
|
|
unsigned long upper,
|
|
const struct suffix_mult *suffixes)
|
|
{
|
|
unsigned long r;
|
|
int old_errno;
|
|
char *e;
|
|
|
|
assert(arg);
|
|
|
|
/* Disallow '-' and any leading whitespace. Speed isn't critical here
|
|
* since we're parsing commandline args. So make sure we get the
|
|
* actual isspace function rather than a larger macro implementaion. */
|
|
if ((*arg == '-') || (isspace)(*arg)) {
|
|
bb_show_usage();
|
|
}
|
|
|
|
/* 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(arg, &e, base);
|
|
/* Do the initial validity check. Note: The standards do not
|
|
* guarantee that errno is set if no digits were found. So we
|
|
* must test for this explicitly. */
|
|
if (errno || (arg == e)) { /* error or no digits */
|
|
bb_show_usage();
|
|
}
|
|
errno = old_errno; /* Ok. So restore errno. */
|
|
|
|
/* Do optional suffix parsing. Allow 'empty' suffix tables.
|
|
* Note that we also all nul suffixes with associated multipliers,
|
|
* to allow for scaling of the arg by some default multiplier. */
|
|
|
|
if (suffixes) {
|
|
while (suffixes->suffix) {
|
|
if (strcmp(suffixes->suffix, e) == 0) {
|
|
if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
|
|
bb_show_usage();
|
|
}
|
|
++e;
|
|
r *= suffixes->mult;
|
|
break;
|
|
}
|
|
++suffixes;
|
|
}
|
|
}
|
|
|
|
/* Finally, check for illegal trailing chars and range limits. */
|
|
/* Note: although we allow leading space (via stroul), trailing space
|
|
* is an error. It would be easy enough to allow though if desired. */
|
|
if (*e || (r < lower) || (r > upper)) {
|
|
bb_show_usage();
|
|
}
|
|
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_xgetlarg_bnd_sfx
|
|
extern
|
|
long bb_xgetlarg_bnd_sfx(const char *arg, int base,
|
|
long lower,
|
|
long upper,
|
|
const struct suffix_mult *suffixes)
|
|
{
|
|
unsigned long u = LONG_MAX;
|
|
long r;
|
|
const char *p = arg;
|
|
|
|
if ((*p == '-') && (p[1] != '+')) {
|
|
++p;
|
|
#if LONG_MAX == (-(LONG_MIN + 1))
|
|
++u; /* two's complement */
|
|
#endif
|
|
}
|
|
|
|
r = bb_xgetularg_bnd_sfx(p, base, 0, u, suffixes);
|
|
|
|
if (*arg == '-') {
|
|
r = -r;
|
|
}
|
|
|
|
if ((r < lower) || (r > upper)) {
|
|
bb_show_usage();
|
|
}
|
|
|
|
return r;
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_getlarg10_sfx
|
|
extern
|
|
long bb_xgetlarg10_sfx(const char *arg, const struct suffix_mult *suffixes)
|
|
{
|
|
return bb_xgetlarg_bnd_sfx(arg, 10, LONG_MIN, LONG_MAX, suffixes);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_xgetularg_bnd
|
|
extern
|
|
unsigned long bb_xgetularg_bnd(const char *arg, int base,
|
|
unsigned long lower,
|
|
unsigned long upper)
|
|
{
|
|
return bb_xgetularg_bnd_sfx(arg, base, lower, upper, NULL);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_xgetularg10_bnd
|
|
extern
|
|
unsigned long bb_xgetularg10_bnd(const char *arg,
|
|
unsigned long lower,
|
|
unsigned long upper)
|
|
{
|
|
return bb_xgetularg_bnd(arg, 10, lower, upper);
|
|
}
|
|
#endif
|
|
|
|
#ifdef L_xgetularg10
|
|
extern
|
|
unsigned long bb_xgetularg10(const char *arg)
|
|
{
|
|
return bb_xgetularg10_bnd(arg, 0, ULONG_MAX);
|
|
}
|
|
#endif
|