source: branches/3.2/mindi-busybox/libbb/bb_strtonum.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 4.0 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 source tree.
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 otherwise 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 * Test code:
23 * char *endptr;
24 * const char *minus = "-";
25 * errno = 0;
26 * bb_strtoi(minus, &endptr, 0); // must set ERANGE
27 * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL);
28 * errno = 0;
29 * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-'
30 * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL);
31 */
32
33static unsigned long long ret_ERANGE(void)
34{
35    errno = ERANGE; /* this ain't as small as it looks (on glibc) */
36    return ULLONG_MAX;
37}
38
39static unsigned long long handle_errors(unsigned long long v, char **endp)
40{
41    char next_ch = **endp;
42
43    /* errno is already set to ERANGE by strtoXXX if value overflowed */
44    if (next_ch) {
45        /* "1234abcg" or out-of-range? */
46        if (isalnum(next_ch) || errno)
47            return ret_ERANGE();
48        /* good number, just suspicious terminator */
49        errno = EINVAL;
50    }
51    return v;
52}
53
54
55unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
56{
57    unsigned long long v;
58    char *endptr;
59
60    if (!endp) endp = &endptr;
61    *endp = (char*) arg;
62
63    /* strtoul("  -4200000000") returns 94967296, errno 0 (!) */
64    /* I don't think that this is right. Preventing this... */
65    if (!isalnum(arg[0])) return ret_ERANGE();
66
67    /* not 100% correct for lib func, but convenient for the caller */
68    errno = 0;
69    v = strtoull(arg, endp, base);
70    return handle_errors(v, endp);
71}
72
73long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
74{
75    unsigned long long v;
76    char *endptr;
77    char first;
78
79    if (!endp) endp = &endptr;
80    *endp = (char*) arg;
81
82    /* Check for the weird "feature":
83     * a "-" string is apparently a valid "number" for strto[u]l[l]!
84     * It returns zero and errno is 0! :( */
85    first = (arg[0] != '-' ? arg[0] : arg[1]);
86    if (!isalnum(first)) return ret_ERANGE();
87
88    errno = 0;
89    v = strtoll(arg, endp, base);
90    return handle_errors(v, endp);
91}
92
93#if ULONG_MAX != ULLONG_MAX
94unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
95{
96    unsigned long v;
97    char *endptr;
98
99    if (!endp) endp = &endptr;
100    *endp = (char*) arg;
101
102    if (!isalnum(arg[0])) return ret_ERANGE();
103    errno = 0;
104    v = strtoul(arg, endp, base);
105    return handle_errors(v, endp);
106}
107
108long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
109{
110    long v;
111    char *endptr;
112    char first;
113
114    if (!endp) endp = &endptr;
115    *endp = (char*) arg;
116
117    first = (arg[0] != '-' ? arg[0] : arg[1]);
118    if (!isalnum(first)) return ret_ERANGE();
119
120    errno = 0;
121    v = strtol(arg, endp, base);
122    return handle_errors(v, endp);
123}
124#endif
125
126#if UINT_MAX != ULONG_MAX
127unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
128{
129    unsigned long v;
130    char *endptr;
131
132    if (!endp) endp = &endptr;
133    *endp = (char*) arg;
134
135    if (!isalnum(arg[0])) return ret_ERANGE();
136    errno = 0;
137    v = strtoul(arg, endp, base);
138    if (v > UINT_MAX) return ret_ERANGE();
139    return handle_errors(v, endp);
140}
141
142int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
143{
144    long v;
145    char *endptr;
146    char first;
147
148    if (!endp) endp = &endptr;
149    *endp = (char*) arg;
150
151    first = (arg[0] != '-' ? arg[0] : arg[1]);
152    if (!isalnum(first)) return ret_ERANGE();
153
154    errno = 0;
155    v = strtol(arg, endp, base);
156    if (v > INT_MAX) return ret_ERANGE();
157    if (v < INT_MIN) return ret_ERANGE();
158    return handle_errors(v, endp);
159}
160#endif
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