| 1 | /* $NetBSD: strtoumax.c,v 1.1 2006/04/22 15:33:33 thorpej Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1990, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * 3. Neither the name of the University nor the names of its contributors
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| 16 | * may be used to endorse or promote products derived from this software
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| 17 | * without specific prior written permission.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 29 | * SUCH DAMAGE.
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| 30 | */
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| 31 | #include <LibConfig.h>
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| 32 | #include <sys/EfiCdefs.h>
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| 33 |
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| 34 | #if !defined(_KERNEL) && !defined(_STANDALONE)
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| 35 | #if defined(LIBC_SCCS) && !defined(lint)
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| 36 | #if 0
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| 37 | static char sccsid[] = "from: @(#)strtoul.c 8.1 (Berkeley) 6/4/93";
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| 38 | #else
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| 39 | __RCSID("$NetBSD: strtoumax.c,v 1.1 2006/04/22 15:33:33 thorpej Exp $");
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| 40 | #endif
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| 41 | #endif /* LIBC_SCCS and not lint */
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| 42 |
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| 43 | #include "namespace.h"
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| 44 |
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| 45 | #include <assert.h>
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| 46 | #include <ctype.h>
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| 47 | #include <errno.h>
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| 48 | #include <inttypes.h>
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| 49 | #include <stddef.h>
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| 50 |
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| 51 | #include <Library/BaseLib.h>
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| 52 |
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| 53 | #ifdef __weak_alias
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| 54 | __weak_alias(strtoumax, _strtoumax)
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| 55 | #endif
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| 56 |
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| 57 | #else /* !_KERNEL && !_STANDALONE */
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| 58 | #include <sys/param.h>
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| 59 | #include <lib/libkern/libkern.h>
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| 60 | #endif /* !_KERNEL && !_STANDALONE */
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| 61 |
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| 62 | /*
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| 63 | * Convert a string to an uintmax_t.
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| 64 | *
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| 65 | * Ignores `locale' stuff. Assumes that the upper and lower case
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| 66 | * alphabets and digits are each contiguous.
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| 67 | */
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| 68 | uintmax_t
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| 69 | strtoumax(const char *nptr, char **endptr, int base)
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| 70 | {
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| 71 | const char *s;
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| 72 | uintmax_t acc, cutoff;
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| 73 | int c;
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| 74 | int neg, any, cutlim;
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| 75 |
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| 76 | _DIAGASSERT(nptr != NULL);
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| 77 | /* endptr may be NULL */
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| 78 |
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| 79 | /*
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| 80 | * See strtol for comments as to the logic used.
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| 81 | */
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| 82 | s = nptr;
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| 83 | do {
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| 84 | c = (unsigned char) *s++;
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| 85 | } while (isspace(c));
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| 86 | if (c == '-') {
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| 87 | neg = 1;
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| 88 | c = *s++;
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| 89 | } else {
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| 90 | neg = 0;
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| 91 | if (c == '+')
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| 92 | c = *s++;
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| 93 | }
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| 94 | if ((base == 0 || base == 16) &&
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| 95 | c == '0' && (*s == 'x' || *s == 'X')) {
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| 96 | c = s[1];
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| 97 | s += 2;
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| 98 | base = 16;
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| 99 | }
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| 100 | if (base == 0)
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| 101 | base = c == '0' ? 8 : 10;
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| 102 |
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| 103 | cutoff = DivU64x32 ((UINT64) UINTMAX_MAX, (UINT32) base);
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| 104 | cutlim = (int) ModU64x32 ((UINT64) UINTMAX_MAX, (UINT32) base);
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| 105 | for (acc = 0, any = 0;; c = (unsigned char) *s++) {
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| 106 | if (isdigit(c))
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| 107 | c -= '0';
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| 108 | else if (isalpha(c)) {
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| 109 | #if defined(_KERNEL) || defined(_STANDALONE)
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| 110 | c = toupper(c) - 'A' + 10;
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| 111 | #else
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| 112 | c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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| 113 | #endif
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| 114 | } else
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| 115 | break;
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| 116 | if (c >= base)
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| 117 | break;
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| 118 | if (any < 0)
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| 119 | continue;
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| 120 | if (acc > cutoff || (acc == cutoff && c > cutlim)) {
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| 121 | #if defined(_KERNEL) || defined(_STANDALONE)
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| 122 | if (endptr)
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| 123 | *endptr = __UNCONST(nptr);
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| 124 | return UINTMAX_MAX;
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| 125 | #else
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| 126 | any = -1;
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| 127 | acc = UINTMAX_MAX;
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| 128 | errno = ERANGE;
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| 129 | #endif
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| 130 | } else {
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| 131 | any = 1;
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| 132 | acc *= (uintmax_t)base;
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| 133 | acc += c;
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| 134 | }
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| 135 | }
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| 136 | if (neg && any > 0)
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| 137 | acc = (uintmax_t)(-((intmax_t)acc));
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| 138 | if (endptr != 0)
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| 139 | *endptr = __UNCONST(any ? s - 1 : nptr);
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| 140 | return (acc);
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| 141 | }
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