[1765] | 1 | /* vi: set sw=4 ts=4: */ |
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| 2 | /* |
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| 3 | * Utility routines. |
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| 4 | * |
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
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| 6 | * |
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
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| 8 | */ |
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| 9 | |
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| 10 | #include "libbb.h" |
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| 11 | |
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| 12 | /* On exit: errno = 0 only if there was non-empty, '\0' terminated value |
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| 13 | * errno = EINVAL if value was not '\0' terminated, but othervise ok |
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| 14 | * Return value is still valid, caller should just check whether end[0] |
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| 15 | * is a valid terminating char for particular case. OTOH, if caller |
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| 16 | * requires '\0' terminated input, [s]he can just check errno == 0. |
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| 17 | * errno = ERANGE if value had alphanumeric terminating char ("1234abcg"). |
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| 18 | * errno = ERANGE if value is out of range, missing, etc. |
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| 19 | * errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok ) |
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| 20 | * return value is all-ones in this case. |
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| 21 | */ |
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| 22 | |
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| 23 | static unsigned long long ret_ERANGE(void) |
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| 24 | { |
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| 25 | errno = ERANGE; /* this ain't as small as it looks (on glibc) */ |
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| 26 | return ULLONG_MAX; |
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| 27 | } |
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| 28 | |
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| 29 | static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr) |
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| 30 | { |
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| 31 | if (endp) *endp = endptr; |
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| 32 | |
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| 33 | /* Check for the weird "feature": |
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| 34 | * a "-" string is apparently a valid "number" for strto[u]l[l]! |
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| 35 | * It returns zero and errno is 0! :( */ |
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| 36 | if (endptr[-1] == '-') |
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| 37 | return ret_ERANGE(); |
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| 38 | |
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| 39 | /* errno is already set to ERANGE by strtoXXX if value overflowed */ |
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| 40 | if (endptr[0]) { |
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| 41 | /* "1234abcg" or out-of-range? */ |
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| 42 | if (isalnum(endptr[0]) || errno) |
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| 43 | return ret_ERANGE(); |
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| 44 | /* good number, just suspicious terminator */ |
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| 45 | errno = EINVAL; |
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| 46 | } |
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| 47 | return v; |
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| 48 | } |
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| 49 | |
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| 50 | |
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| 51 | unsigned long long bb_strtoull(const char *arg, char **endp, int base) |
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| 52 | { |
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| 53 | unsigned long long v; |
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| 54 | char *endptr; |
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| 55 | |
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| 56 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */ |
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| 57 | /* I don't think that this is right. Preventing this... */ |
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| 58 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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| 59 | |
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| 60 | /* not 100% correct for lib func, but convenient for the caller */ |
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| 61 | errno = 0; |
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| 62 | v = strtoull(arg, &endptr, base); |
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| 63 | return handle_errors(v, endp, endptr); |
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| 64 | } |
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| 65 | |
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| 66 | long long bb_strtoll(const char *arg, char **endp, int base) |
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| 67 | { |
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| 68 | unsigned long long v; |
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| 69 | char *endptr; |
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| 70 | |
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| 71 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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| 72 | errno = 0; |
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| 73 | v = strtoll(arg, &endptr, base); |
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| 74 | return handle_errors(v, endp, endptr); |
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| 75 | } |
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| 76 | |
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| 77 | #if ULONG_MAX != ULLONG_MAX |
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| 78 | unsigned long bb_strtoul(const char *arg, char **endp, int base) |
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| 79 | { |
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| 80 | unsigned long v; |
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| 81 | char *endptr; |
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| 82 | |
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| 83 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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| 84 | errno = 0; |
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| 85 | v = strtoul(arg, &endptr, base); |
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| 86 | return handle_errors(v, endp, endptr); |
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| 87 | } |
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| 88 | |
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| 89 | long bb_strtol(const char *arg, char **endp, int base) |
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| 90 | { |
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| 91 | long v; |
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| 92 | char *endptr; |
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| 93 | |
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| 94 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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| 95 | errno = 0; |
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| 96 | v = strtol(arg, &endptr, base); |
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| 97 | return handle_errors(v, endp, endptr); |
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| 98 | } |
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| 99 | #endif |
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| 100 | |
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| 101 | #if UINT_MAX != ULONG_MAX |
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| 102 | unsigned bb_strtou(const char *arg, char **endp, int base) |
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| 103 | { |
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| 104 | unsigned long v; |
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| 105 | char *endptr; |
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| 106 | |
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| 107 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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| 108 | errno = 0; |
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| 109 | v = strtoul(arg, &endptr, base); |
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| 110 | if (v > UINT_MAX) return ret_ERANGE(); |
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| 111 | return handle_errors(v, endp, endptr); |
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| 112 | } |
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| 113 | |
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| 114 | int bb_strtoi(const char *arg, char **endp, int base) |
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| 115 | { |
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| 116 | long v; |
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| 117 | char *endptr; |
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| 118 | |
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| 119 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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| 120 | errno = 0; |
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| 121 | v = strtol(arg, &endptr, base); |
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| 122 | if (v > INT_MAX) return ret_ERANGE(); |
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| 123 | if (v < INT_MIN) return ret_ERANGE(); |
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| 124 | return handle_errors(v, endp, endptr); |
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| 125 | } |
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| 126 | #endif |
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| 127 | |
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| 128 | /* Floating point */ |
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| 129 | |
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| 130 | #if 0 |
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| 131 | |
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| 132 | #include <math.h> /* just for HUGE_VAL */ |
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| 133 | #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9) |
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| 134 | double bb_strtod(const char *arg, char **endp) |
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| 135 | { |
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| 136 | double v; |
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| 137 | char *endptr; |
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| 138 | |
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| 139 | if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err; |
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| 140 | errno = 0; |
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| 141 | v = strtod(arg, &endptr); |
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| 142 | if (endp) *endp = endptr; |
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| 143 | if (endptr[0]) { |
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| 144 | /* "1234abcg" or out-of-range? */ |
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| 145 | if (isalnum(endptr[0]) || errno) { |
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| 146 | err: |
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| 147 | errno = ERANGE; |
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| 148 | return HUGE_VAL; |
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| 149 | } |
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| 150 | /* good number, just suspicious terminator */ |
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| 151 | errno = EINVAL; |
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| 152 | } |
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| 153 | return v; |
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| 154 | } |
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| 155 | |
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| 156 | #endif |
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