blob: 44b8a1dcf32e4e7dad0037086782218ce3d1020b [file] [log] [blame]
Manuel Novoa III cad53642003-03-19 09:13:01 +00001/* vi: set sw=4 ts=4: */
2/*
3 * xgetularg* implementations for busybox
4 *
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <stdlib.h>
24#include <string.h>
25#include <limits.h>
26#include <ctype.h>
27#include <errno.h>
28#include <assert.h>
29#include "libbb.h"
30
31#ifdef L_xgetularg_bnd_sfx
Manuel Novoa III cad53642003-03-19 09:13:01 +000032unsigned long bb_xgetularg_bnd_sfx(const char *arg, int base,
33 unsigned long lower,
34 unsigned long upper,
35 const struct suffix_mult *suffixes)
36{
37 unsigned long r;
38 int old_errno;
39 char *e;
40
41 assert(arg);
42
43 /* Disallow '-' and any leading whitespace. Speed isn't critical here
44 * since we're parsing commandline args. So make sure we get the
45 * actual isspace function rather than a larger macro implementaion. */
46 if ((*arg == '-') || (isspace)(*arg)) {
47 bb_show_usage();
48 }
49
50 /* Since this is a lib function, we're not allowed to reset errno to 0.
51 * Doing so could break an app that is deferring checking of errno.
52 * So, save the old value so that we can restore it if successful. */
53 old_errno = errno;
54 errno = 0;
55 r = strtoul(arg, &e, base);
56 /* Do the initial validity check. Note: The standards do not
57 * guarantee that errno is set if no digits were found. So we
58 * must test for this explicitly. */
59 if (errno || (arg == e)) { /* error or no digits */
60 bb_show_usage();
61 }
62 errno = old_errno; /* Ok. So restore errno. */
Eric Andersenc7bda1c2004-03-15 08:29:22 +000063
Manuel Novoa III cad53642003-03-19 09:13:01 +000064 /* Do optional suffix parsing. Allow 'empty' suffix tables.
65 * Note that we also all nul suffixes with associated multipliers,
66 * to allow for scaling of the arg by some default multiplier. */
67
68 if (suffixes) {
69 while (suffixes->suffix) {
70 if (strcmp(suffixes->suffix, e) == 0) {
71 if (ULONG_MAX / suffixes->mult < r) { /* Overflow! */
72 bb_show_usage();
73 }
74 ++e;
75 r *= suffixes->mult;
76 break;
Tim Rikerc1ef7bd2006-01-25 00:08:53 +000077 }
Manuel Novoa III cad53642003-03-19 09:13:01 +000078 ++suffixes;
79 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +000080 }
Manuel Novoa III cad53642003-03-19 09:13:01 +000081
82 /* Finally, check for illegal trailing chars and range limits. */
83 /* Note: although we allow leading space (via stroul), trailing space
84 * is an error. It would be easy enough to allow though if desired. */
85 if (*e || (r < lower) || (r > upper)) {
86 bb_show_usage();
87 }
88
89 return r;
90}
91#endif
92
93#ifdef L_xgetlarg_bnd_sfx
Manuel Novoa III cad53642003-03-19 09:13:01 +000094long bb_xgetlarg_bnd_sfx(const char *arg, int base,
95 long lower,
96 long upper,
97 const struct suffix_mult *suffixes)
98{
99 unsigned long u = LONG_MAX;
100 long r;
101 const char *p = arg;
102
103 if ((*p == '-') && (p[1] != '+')) {
104 ++p;
105#if LONG_MAX == (-(LONG_MIN + 1))
106 ++u; /* two's complement */
107#endif
108 }
109
110 r = bb_xgetularg_bnd_sfx(p, base, 0, u, suffixes);
111
112 if (*arg == '-') {
113 r = -r;
114 }
115
116 if ((r < lower) || (r > upper)) {
117 bb_show_usage();
118 }
119
120 return r;
121}
122#endif
123
124#ifdef L_getlarg10_sfx
Manuel Novoa III cad53642003-03-19 09:13:01 +0000125long bb_xgetlarg10_sfx(const char *arg, const struct suffix_mult *suffixes)
126{
127 return bb_xgetlarg_bnd_sfx(arg, 10, LONG_MIN, LONG_MAX, suffixes);
128}
129#endif
130
131#ifdef L_xgetularg_bnd
Manuel Novoa III cad53642003-03-19 09:13:01 +0000132unsigned long bb_xgetularg_bnd(const char *arg, int base,
133 unsigned long lower,
134 unsigned long upper)
135{
136 return bb_xgetularg_bnd_sfx(arg, base, lower, upper, NULL);
137}
138#endif
139
140#ifdef L_xgetularg10_bnd
Manuel Novoa III cad53642003-03-19 09:13:01 +0000141unsigned long bb_xgetularg10_bnd(const char *arg,
142 unsigned long lower,
143 unsigned long upper)
144{
145 return bb_xgetularg_bnd(arg, 10, lower, upper);
146}
147#endif
148
149#ifdef L_xgetularg10
Manuel Novoa III cad53642003-03-19 09:13:01 +0000150unsigned long bb_xgetularg10(const char *arg)
151{
152 return bb_xgetularg10_bnd(arg, 0, ULONG_MAX);
153}
154#endif