[3320] | 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 source tree.
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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 otherwise 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 | * 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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| 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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| 39 | static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
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| 40 | {
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| 41 | if (endp) *endp = endptr;
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| 42 |
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| 43 | /* errno is already set to ERANGE by strtoXXX if value overflowed */
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| 44 | if (endptr[0]) {
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| 45 | /* "1234abcg" or out-of-range? */
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| 46 | if (isalnum(endptr[0]) || errno)
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| 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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| 55 | unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
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| 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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| 60 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
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| 61 | /* I don't think that this is right. Preventing this... */
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| 62 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 63 |
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| 64 | /* not 100% correct for lib func, but convenient for the caller */
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| 65 | errno = 0;
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| 66 | v = strtoull(arg, &endptr, base);
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| 67 | return handle_errors(v, endp, endptr);
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| 68 | }
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| 69 |
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| 70 | long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
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| 71 | {
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| 72 | unsigned long long v;
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| 73 | char *endptr;
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| 74 |
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| 75 | /* Check for the weird "feature":
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| 76 | * a "-" string is apparently a valid "number" for strto[u]l[l]!
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| 77 | * It returns zero and errno is 0! :( */
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| 78 | char first = (arg[0] != '-' ? arg[0] : arg[1]);
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| 79 | if (!isalnum(first)) return ret_ERANGE();
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| 80 |
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| 81 | errno = 0;
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| 82 | v = strtoll(arg, &endptr, base);
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| 83 | return handle_errors(v, endp, endptr);
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| 84 | }
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| 85 |
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| 86 | #if ULONG_MAX != ULLONG_MAX
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| 87 | unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
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| 88 | {
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| 89 | unsigned long v;
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| 90 | char *endptr;
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| 91 |
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| 92 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 93 | errno = 0;
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| 94 | v = strtoul(arg, &endptr, base);
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| 95 | return handle_errors(v, endp, endptr);
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| 96 | }
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| 97 |
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| 98 | long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
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| 99 | {
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| 100 | long v;
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| 101 | char *endptr;
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| 102 |
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| 103 | char first = (arg[0] != '-' ? arg[0] : arg[1]);
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| 104 | if (!isalnum(first)) return ret_ERANGE();
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| 105 |
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| 106 | errno = 0;
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| 107 | v = strtol(arg, &endptr, base);
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| 108 | return handle_errors(v, endp, endptr);
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| 109 | }
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| 110 | #endif
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| 111 |
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| 112 | #if UINT_MAX != ULONG_MAX
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| 113 | unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
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| 114 | {
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| 115 | unsigned long v;
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| 116 | char *endptr;
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| 117 |
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| 118 | if (!isalnum(arg[0])) return ret_ERANGE();
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| 119 | errno = 0;
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| 120 | v = strtoul(arg, &endptr, base);
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| 121 | if (v > UINT_MAX) return ret_ERANGE();
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| 122 | return handle_errors(v, endp, endptr);
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| 123 | }
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| 124 |
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| 125 | int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
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| 126 | {
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| 127 | long v;
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| 128 | char *endptr;
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| 129 |
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| 130 | char first = (arg[0] != '-' ? arg[0] : arg[1]);
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| 131 | if (!isalnum(first)) return ret_ERANGE();
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| 132 |
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| 133 | errno = 0;
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| 134 | v = strtol(arg, &endptr, base);
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| 135 | if (v > INT_MAX) return ret_ERANGE();
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| 136 | if (v < INT_MIN) return ret_ERANGE();
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| 137 | return handle_errors(v, endp, endptr);
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| 138 | }
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| 139 | #endif
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