source: branches/2.2.5/mindi-busybox/libbb/bb_strtonum.c @ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 13 years ago

Update to busybox 1.7.2

  • Property svn:eol-style set to native
File size: 3.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include "libbb.h"
11
12/* On exit: errno = 0 only if there was non-empty, '\0' terminated value
13 * errno = EINVAL if value was not '\0' terminated, but othervise ok
14 *    Return value is still valid, caller should just check whether end[0]
15 *    is a valid terminating char for particular case. OTOH, if caller
16 *    requires '\0' terminated input, [s]he can just check errno == 0.
17 * errno = ERANGE if value had alphanumeric terminating char ("1234abcg").
18 * errno = ERANGE if value is out of range, missing, etc.
19 * errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok )
20 *    return value is all-ones in this case.
21 */
22
23static unsigned long long ret_ERANGE(void)
24{
25    errno = ERANGE; /* this ain't as small as it looks (on glibc) */
26    return ULLONG_MAX;
27}
28
29static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
30{
31    if (endp) *endp = endptr;
32
33    /* Check for the weird "feature":
34     * a "-" string is apparently a valid "number" for strto[u]l[l]!
35     * It returns zero and errno is 0! :( */
36    if (endptr[-1] == '-')
37        return ret_ERANGE();
38
39    /* errno is already set to ERANGE by strtoXXX if value overflowed */
40    if (endptr[0]) {
41        /* "1234abcg" or out-of-range? */
42        if (isalnum(endptr[0]) || errno)
43            return ret_ERANGE();
44        /* good number, just suspicious terminator */
45        errno = EINVAL;
46    }
47    return v;
48}
49
50
51unsigned long long bb_strtoull(const char *arg, char **endp, int base)
52{
53    unsigned long long v;
54    char *endptr;
55
56    /* strtoul("  -4200000000") returns 94967296, errno 0 (!) */
57    /* I don't think that this is right. Preventing this... */
58    if (!isalnum(arg[0])) return ret_ERANGE();
59
60    /* not 100% correct for lib func, but convenient for the caller */
61    errno = 0;
62    v = strtoull(arg, &endptr, base);
63    return handle_errors(v, endp, endptr);
64}
65
66long long bb_strtoll(const char *arg, char **endp, int base)
67{
68    unsigned long long v;
69    char *endptr;
70
71    if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
72    errno = 0;
73    v = strtoll(arg, &endptr, base);
74    return handle_errors(v, endp, endptr);
75}
76
77#if ULONG_MAX != ULLONG_MAX
78unsigned long bb_strtoul(const char *arg, char **endp, int base)
79{
80    unsigned long v;
81    char *endptr;
82
83    if (!isalnum(arg[0])) return ret_ERANGE();
84    errno = 0;
85    v = strtoul(arg, &endptr, base);
86    return handle_errors(v, endp, endptr);
87}
88
89long bb_strtol(const char *arg, char **endp, int base)
90{
91    long v;
92    char *endptr;
93
94    if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
95    errno = 0;
96    v = strtol(arg, &endptr, base);
97    return handle_errors(v, endp, endptr);
98}
99#endif
100
101#if UINT_MAX != ULONG_MAX
102unsigned bb_strtou(const char *arg, char **endp, int base)
103{
104    unsigned long v;
105    char *endptr;
106
107    if (!isalnum(arg[0])) return ret_ERANGE();
108    errno = 0;
109    v = strtoul(arg, &endptr, base);
110    if (v > UINT_MAX) return ret_ERANGE();
111    return handle_errors(v, endp, endptr);
112}
113
114int bb_strtoi(const char *arg, char **endp, int base)
115{
116    long v;
117    char *endptr;
118
119    if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
120    errno = 0;
121    v = strtol(arg, &endptr, base);
122    if (v > INT_MAX) return ret_ERANGE();
123    if (v < INT_MIN) return ret_ERANGE();
124    return handle_errors(v, endp, endptr);
125}
126#endif
127
128/* Floating point */
129
130#if 0
131
132#include <math.h>  /* just for HUGE_VAL */
133#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
134double bb_strtod(const char *arg, char **endp)
135{
136    double v;
137    char *endptr;
138
139    if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err;
140    errno = 0;
141    v = strtod(arg, &endptr);
142    if (endp) *endp = endptr;
143    if (endptr[0]) {
144        /* "1234abcg" or out-of-range? */
145        if (isalnum(endptr[0]) || errno) {
146 err:
147            errno = ERANGE;
148            return HUGE_VAL;
149        }
150        /* good number, just suspicious terminator */
151        errno = EINVAL;
152    }
153    return v;
154}
155
156#endif
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