source: branches/2.2.2/mindi-busybox/libbb/xgetularg.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 4.0 KB
Line 
1/* 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
32unsigned 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. */
63
64    /* 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;
77            }
78            ++suffixes;
79        }
80    }
81
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
94long 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
125long 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
132unsigned 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
141unsigned 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
150unsigned long bb_xgetularg10(const char *arg)
151{
152    return bb_xgetularg10_bnd(arg, 0, ULONG_MAX);
153}
154#endif
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