[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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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 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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[2725] | 13 | * errno = EINVAL if value was not '\0' terminated, but otherwise ok
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[1765] | 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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[2725] | 21 | *
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| 22 | * Test code:
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| 23 | * char *endptr;
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| 24 | * const char *minus = "-";
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| 25 | * errno = 0;
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| 26 | * bb_strtoi(minus, &endptr, 0); // must set ERANGE
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| 27 | * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL);
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| 28 | * errno = 0;
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| 29 | * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-'
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| 30 | * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL);
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[1765] | 31 | */
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| 32 |
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| 33 | static unsigned long long ret_ERANGE(void)
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| 34 | {
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| 35 | errno = ERANGE; /* this ain't as small as it looks (on glibc) */
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| 36 | return ULLONG_MAX;
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| 37 | }
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| 38 |
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[3232] | 39 | static unsigned long long handle_errors(unsigned long long v, char **endp)
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[1765] | 40 | {
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[3232] | 41 | char next_ch = **endp;
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[1765] | 42 |
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| 43 | /* errno is already set to ERANGE by strtoXXX if value overflowed */
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[3232] | 44 | if (next_ch) {
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[1765] | 45 | /* "1234abcg" or out-of-range? */
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[3232] | 46 | if (isalnum(next_ch) || errno)
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[1765] | 47 | return ret_ERANGE();
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| 48 | /* good number, just suspicious terminator */
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| 49 | errno = EINVAL;
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| 50 | }
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| 51 | return v;
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| 52 | }
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| 53 |
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| 54 |
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[2725] | 55 | unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
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[1765] | 56 | {
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| 57 | unsigned long long v;
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| 58 | char *endptr;
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| 59 |
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[3232] | 60 | if (!endp) endp = &endptr;
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| 61 | *endp = (char*) arg;
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| 62 |
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[1765] | 63 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
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| 64 | /* I don't think that this is right. Preventing this... */
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| 65 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 66 |
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| 67 | /* not 100% correct for lib func, but convenient for the caller */
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| 68 | errno = 0;
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[3232] | 69 | v = strtoull(arg, endp, base);
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| 70 | return handle_errors(v, endp);
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[1765] | 71 | }
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| 72 |
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[2725] | 73 | long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
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[1765] | 74 | {
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| 75 | unsigned long long v;
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| 76 | char *endptr;
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[3232] | 77 | char first;
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[1765] | 78 |
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[3232] | 79 | if (!endp) endp = &endptr;
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| 80 | *endp = (char*) arg;
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| 81 |
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[2725] | 82 | /* Check for the weird "feature":
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| 83 | * a "-" string is apparently a valid "number" for strto[u]l[l]!
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| 84 | * It returns zero and errno is 0! :( */
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[3232] | 85 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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[2725] | 86 | if (!isalnum(first)) return ret_ERANGE();
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| 87 |
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[1765] | 88 | errno = 0;
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[3232] | 89 | v = strtoll(arg, endp, base);
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| 90 | return handle_errors(v, endp);
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[1765] | 91 | }
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| 92 |
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| 93 | #if ULONG_MAX != ULLONG_MAX
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[2725] | 94 | unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
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[1765] | 95 | {
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| 96 | unsigned long v;
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| 97 | char *endptr;
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| 98 |
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[3232] | 99 | if (!endp) endp = &endptr;
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| 100 | *endp = (char*) arg;
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| 101 |
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[1765] | 102 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 103 | errno = 0;
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[3232] | 104 | v = strtoul(arg, endp, base);
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| 105 | return handle_errors(v, endp);
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[1765] | 106 | }
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| 107 |
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[2725] | 108 | long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
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[1765] | 109 | {
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| 110 | long v;
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| 111 | char *endptr;
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[3232] | 112 | char first;
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[1765] | 113 |
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[3232] | 114 | if (!endp) endp = &endptr;
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| 115 | *endp = (char*) arg;
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| 116 |
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| 117 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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[2725] | 118 | if (!isalnum(first)) return ret_ERANGE();
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| 119 |
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[1765] | 120 | errno = 0;
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[3232] | 121 | v = strtol(arg, endp, base);
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| 122 | return handle_errors(v, endp);
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[1765] | 123 | }
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| 124 | #endif
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| 125 |
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| 126 | #if UINT_MAX != ULONG_MAX
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[2725] | 127 | unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
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[1765] | 128 | {
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| 129 | unsigned long v;
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| 130 | char *endptr;
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| 131 |
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[3232] | 132 | if (!endp) endp = &endptr;
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| 133 | *endp = (char*) arg;
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| 134 |
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[1765] | 135 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 136 | errno = 0;
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[3232] | 137 | v = strtoul(arg, endp, base);
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[1765] | 138 | if (v > UINT_MAX) return ret_ERANGE();
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[3232] | 139 | return handle_errors(v, endp);
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[1765] | 140 | }
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| 141 |
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[2725] | 142 | int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
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[1765] | 143 | {
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| 144 | long v;
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| 145 | char *endptr;
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[3232] | 146 | char first;
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[1765] | 147 |
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[3232] | 148 | if (!endp) endp = &endptr;
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| 149 | *endp = (char*) arg;
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| 150 |
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| 151 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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[2725] | 152 | if (!isalnum(first)) return ret_ERANGE();
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| 153 |
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[1765] | 154 | errno = 0;
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[3232] | 155 | v = strtol(arg, endp, base);
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[1765] | 156 | if (v > INT_MAX) return ret_ERANGE();
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| 157 | if (v < INT_MIN) return ret_ERANGE();
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[3232] | 158 | return handle_errors(v, endp);
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[1765] | 159 | }
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| 160 | #endif
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