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