[1765] | 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 othervise 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 |
|
---|
| 23 | static unsigned long long ret_ERANGE(void)
|
---|
| 24 | {
|
---|
| 25 | errno = ERANGE; /* this ain't as small as it looks (on glibc) */
|
---|
| 26 | return ULLONG_MAX;
|
---|
| 27 | }
|
---|
| 28 |
|
---|
| 29 | static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr)
|
---|
| 30 | {
|
---|
| 31 | if (endp) *endp = endptr;
|
---|
| 32 |
|
---|
| 33 | /* Check for the weird "feature":
|
---|
| 34 | * a "-" string is apparently a valid "number" for strto[u]l[l]!
|
---|
| 35 | * It returns zero and errno is 0! :( */
|
---|
| 36 | if (endptr[-1] == '-')
|
---|
| 37 | return ret_ERANGE();
|
---|
| 38 |
|
---|
| 39 | /* errno is already set to ERANGE by strtoXXX if value overflowed */
|
---|
| 40 | if (endptr[0]) {
|
---|
| 41 | /* "1234abcg" or out-of-range? */
|
---|
| 42 | if (isalnum(endptr[0]) || errno)
|
---|
| 43 | return ret_ERANGE();
|
---|
| 44 | /* good number, just suspicious terminator */
|
---|
| 45 | errno = EINVAL;
|
---|
| 46 | }
|
---|
| 47 | return v;
|
---|
| 48 | }
|
---|
| 49 |
|
---|
| 50 |
|
---|
| 51 | unsigned long long bb_strtoull(const char *arg, char **endp, int base)
|
---|
| 52 | {
|
---|
| 53 | unsigned long long v;
|
---|
| 54 | char *endptr;
|
---|
| 55 |
|
---|
| 56 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
|
---|
| 57 | /* I don't think that this is right. Preventing this... */
|
---|
| 58 | if (!isalnum(arg[0])) return ret_ERANGE();
|
---|
| 59 |
|
---|
| 60 | /* not 100% correct for lib func, but convenient for the caller */
|
---|
| 61 | errno = 0;
|
---|
| 62 | v = strtoull(arg, &endptr, base);
|
---|
| 63 | return handle_errors(v, endp, endptr);
|
---|
| 64 | }
|
---|
| 65 |
|
---|
| 66 | long long bb_strtoll(const char *arg, char **endp, int base)
|
---|
| 67 | {
|
---|
| 68 | unsigned long long v;
|
---|
| 69 | char *endptr;
|
---|
| 70 |
|
---|
| 71 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
|
---|
| 72 | errno = 0;
|
---|
| 73 | v = strtoll(arg, &endptr, base);
|
---|
| 74 | return handle_errors(v, endp, endptr);
|
---|
| 75 | }
|
---|
| 76 |
|
---|
| 77 | #if ULONG_MAX != ULLONG_MAX
|
---|
| 78 | unsigned long bb_strtoul(const char *arg, char **endp, int base)
|
---|
| 79 | {
|
---|
| 80 | unsigned long v;
|
---|
| 81 | char *endptr;
|
---|
| 82 |
|
---|
| 83 | if (!isalnum(arg[0])) return ret_ERANGE();
|
---|
| 84 | errno = 0;
|
---|
| 85 | v = strtoul(arg, &endptr, base);
|
---|
| 86 | return handle_errors(v, endp, endptr);
|
---|
| 87 | }
|
---|
| 88 |
|
---|
| 89 | long bb_strtol(const char *arg, char **endp, int base)
|
---|
| 90 | {
|
---|
| 91 | long v;
|
---|
| 92 | char *endptr;
|
---|
| 93 |
|
---|
| 94 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
|
---|
| 95 | errno = 0;
|
---|
| 96 | v = strtol(arg, &endptr, base);
|
---|
| 97 | return handle_errors(v, endp, endptr);
|
---|
| 98 | }
|
---|
| 99 | #endif
|
---|
| 100 |
|
---|
| 101 | #if UINT_MAX != ULONG_MAX
|
---|
| 102 | unsigned bb_strtou(const char *arg, char **endp, int base)
|
---|
| 103 | {
|
---|
| 104 | unsigned long v;
|
---|
| 105 | char *endptr;
|
---|
| 106 |
|
---|
| 107 | if (!isalnum(arg[0])) return ret_ERANGE();
|
---|
| 108 | errno = 0;
|
---|
| 109 | v = strtoul(arg, &endptr, base);
|
---|
| 110 | if (v > UINT_MAX) return ret_ERANGE();
|
---|
| 111 | return handle_errors(v, endp, endptr);
|
---|
| 112 | }
|
---|
| 113 |
|
---|
| 114 | int bb_strtoi(const char *arg, char **endp, int base)
|
---|
| 115 | {
|
---|
| 116 | long v;
|
---|
| 117 | char *endptr;
|
---|
| 118 |
|
---|
| 119 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
|
---|
| 120 | errno = 0;
|
---|
| 121 | v = strtol(arg, &endptr, base);
|
---|
| 122 | if (v > INT_MAX) return ret_ERANGE();
|
---|
| 123 | if (v < INT_MIN) return ret_ERANGE();
|
---|
| 124 | return handle_errors(v, endp, endptr);
|
---|
| 125 | }
|
---|
| 126 | #endif
|
---|
| 127 |
|
---|
| 128 | /* Floating point */
|
---|
| 129 |
|
---|
| 130 | #if 0
|
---|
| 131 |
|
---|
| 132 | #include <math.h> /* just for HUGE_VAL */
|
---|
| 133 | #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
|
---|
| 134 | double bb_strtod(const char *arg, char **endp)
|
---|
| 135 | {
|
---|
| 136 | double v;
|
---|
| 137 | char *endptr;
|
---|
| 138 |
|
---|
| 139 | if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err;
|
---|
| 140 | errno = 0;
|
---|
| 141 | v = strtod(arg, &endptr);
|
---|
| 142 | if (endp) *endp = endptr;
|
---|
| 143 | if (endptr[0]) {
|
---|
| 144 | /* "1234abcg" or out-of-range? */
|
---|
| 145 | if (isalnum(endptr[0]) || errno) {
|
---|
| 146 | err:
|
---|
| 147 | errno = ERANGE;
|
---|
| 148 | return HUGE_VAL;
|
---|
| 149 | }
|
---|
| 150 | /* good number, just suspicious terminator */
|
---|
| 151 | errno = EINVAL;
|
---|
| 152 | }
|
---|
| 153 | return v;
|
---|
| 154 | }
|
---|
| 155 |
|
---|
| 156 | #endif
|
---|