Contents of /tags/mkinitrd-6_2_3/busybox/libbb/bb_strtonum.c
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Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
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Mon May 31 20:54:44 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3840 byte(s)
tagged 'mkinitrd-6_2_3'
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 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 | |
33 | static 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 | |
39 | static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr) |
40 | { |
41 | if (endp) *endp = endptr; |
42 | |
43 | /* errno is already set to ERANGE by strtoXXX if value overflowed */ |
44 | if (endptr[0]) { |
45 | /* "1234abcg" or out-of-range? */ |
46 | if (isalnum(endptr[0]) || errno) |
47 | return ret_ERANGE(); |
48 | /* good number, just suspicious terminator */ |
49 | errno = EINVAL; |
50 | } |
51 | return v; |
52 | } |
53 | |
54 | |
55 | unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base) |
56 | { |
57 | unsigned long long v; |
58 | char *endptr; |
59 | |
60 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */ |
61 | /* I don't think that this is right. Preventing this... */ |
62 | if (!isalnum(arg[0])) return ret_ERANGE(); |
63 | |
64 | /* not 100% correct for lib func, but convenient for the caller */ |
65 | errno = 0; |
66 | v = strtoull(arg, &endptr, base); |
67 | return handle_errors(v, endp, endptr); |
68 | } |
69 | |
70 | long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base) |
71 | { |
72 | unsigned long long v; |
73 | char *endptr; |
74 | |
75 | /* Check for the weird "feature": |
76 | * a "-" string is apparently a valid "number" for strto[u]l[l]! |
77 | * It returns zero and errno is 0! :( */ |
78 | char first = (arg[0] != '-' ? arg[0] : arg[1]); |
79 | if (!isalnum(first)) return ret_ERANGE(); |
80 | |
81 | errno = 0; |
82 | v = strtoll(arg, &endptr, base); |
83 | return handle_errors(v, endp, endptr); |
84 | } |
85 | |
86 | #if ULONG_MAX != ULLONG_MAX |
87 | unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base) |
88 | { |
89 | unsigned long v; |
90 | char *endptr; |
91 | |
92 | if (!isalnum(arg[0])) return ret_ERANGE(); |
93 | errno = 0; |
94 | v = strtoul(arg, &endptr, base); |
95 | return handle_errors(v, endp, endptr); |
96 | } |
97 | |
98 | long FAST_FUNC bb_strtol(const char *arg, char **endp, int base) |
99 | { |
100 | long v; |
101 | char *endptr; |
102 | |
103 | char first = (arg[0] != '-' ? arg[0] : arg[1]); |
104 | if (!isalnum(first)) return ret_ERANGE(); |
105 | |
106 | errno = 0; |
107 | v = strtol(arg, &endptr, base); |
108 | return handle_errors(v, endp, endptr); |
109 | } |
110 | #endif |
111 | |
112 | #if UINT_MAX != ULONG_MAX |
113 | unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base) |
114 | { |
115 | unsigned long v; |
116 | char *endptr; |
117 | |
118 | if (!isalnum(arg[0])) return ret_ERANGE(); |
119 | errno = 0; |
120 | v = strtoul(arg, &endptr, base); |
121 | if (v > UINT_MAX) return ret_ERANGE(); |
122 | return handle_errors(v, endp, endptr); |
123 | } |
124 | |
125 | int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base) |
126 | { |
127 | long v; |
128 | char *endptr; |
129 | |
130 | char first = (arg[0] != '-' ? arg[0] : arg[1]); |
131 | if (!isalnum(first)) return ret_ERANGE(); |
132 | |
133 | errno = 0; |
134 | v = strtol(arg, &endptr, base); |
135 | if (v > INT_MAX) return ret_ERANGE(); |
136 | if (v < INT_MIN) return ret_ERANGE(); |
137 | return handle_errors(v, endp, endptr); |
138 | } |
139 | #endif |