| 1 | /*
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| 2 | * Copyright (c) 1990 Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. [rescinded 22 July 1999]
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| 14 | * 4. Neither the name of the University nor the names of its contributors
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| 15 | * may be used to endorse or promote products derived from this software
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| 16 | * without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 28 | * SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #ifdef HAVE_CONFIG_H
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| 32 | #include "config.h"
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| 33 | #endif
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| 34 | #ifdef HAVE_LIMITS_H
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| 35 | #include <limits.h>
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| 36 | #endif
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| 37 | #ifdef HAVE_SYS_PARAM_H
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| 38 | #include <sys/param.h>
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| 39 | #endif
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| 40 | #include <errno.h>
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| 41 | #ifdef NEED_DECLARATION_ERRNO
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| 42 | extern int errno;
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| 43 | #endif
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| 44 | #if 0
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| 45 | #include <stdlib.h>
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| 46 | #endif
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| 47 | #include "ansidecl.h"
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| 48 | #include "safe-ctype.h"
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| 49 |
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| 50 | #ifndef ULONG_MAX
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| 51 | #define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF */
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| 52 | #endif
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| 53 |
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| 54 | /*
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| 55 | * Convert a string to an unsigned long integer.
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| 56 | *
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| 57 | * Ignores `locale' stuff. Assumes that the upper and lower case
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| 58 | * alphabets and digits are each contiguous.
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| 59 | */
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| 60 | unsigned long
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| 61 | strtoul(nptr, endptr, base)
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| 62 | const char *nptr;
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| 63 | char **endptr;
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| 64 | register int base;
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| 65 | {
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| 66 | register const char *s = nptr;
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| 67 | register unsigned long acc;
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| 68 | register int c;
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| 69 | register unsigned long cutoff;
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| 70 | register int neg = 0, any, cutlim;
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| 71 |
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| 72 | /*
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| 73 | * See strtol for comments as to the logic used.
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| 74 | */
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| 75 | do {
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| 76 | c = *s++;
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| 77 | } while (ISSPACE(c));
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| 78 | if (c == '-') {
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| 79 | neg = 1;
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| 80 | c = *s++;
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| 81 | } else if (c == '+')
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| 82 | c = *s++;
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| 83 | if ((base == 0 || base == 16) &&
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| 84 | c == '0' && (*s == 'x' || *s == 'X')) {
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| 85 | c = s[1];
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| 86 | s += 2;
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| 87 | base = 16;
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| 88 | }
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| 89 | if (base == 0)
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| 90 | base = c == '0' ? 8 : 10;
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| 91 | cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
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| 92 | cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
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| 93 | for (acc = 0, any = 0;; c = *s++) {
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| 94 | if (ISDIGIT(c))
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| 95 | c -= '0';
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| 96 | else if (ISALPHA(c))
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| 97 | c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
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| 98 | else
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| 99 | break;
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| 100 | if (c >= base)
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| 101 | break;
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| 102 | if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
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| 103 | any = -1;
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| 104 | else {
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| 105 | any = 1;
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| 106 | acc *= base;
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| 107 | acc += c;
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| 108 | }
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| 109 | }
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| 110 | if (any < 0) {
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| 111 | acc = ULONG_MAX;
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| 112 | errno = ERANGE;
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| 113 | } else if (neg)
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| 114 | acc = -acc;
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| 115 | if (endptr != 0)
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| 116 | *endptr = (char *) (any ? s - 1 : nptr);
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| 117 | return (acc);
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| 118 | }
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