1 /* $DragonFly: src/lib/libc/stdlib/_strtoul.h,v 1.1 2005/03/17 15:09:01 joerg Exp $ */
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
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31 * Original version ID:
32 * $NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp $
36 * function template for strtoul, strtoull and strtoumax.
39 * _FUNCNAME : function name
40 * __UINT : return type
41 * __UINT_MAX : upper limit of the return type
45 _FUNCNAME(const char *nptr, char **endptr, int base)
50 int i, neg, any, cutlim;
52 _DIAGASSERT(nptr != NULL);
53 /* endptr may be NULL */
55 /* check base value */
56 if (base && (base < 2 || base > 36)) {
62 * Skip white space and pick up leading +/- sign if any.
63 * If base is 0, allow 0x for hex and 0 for octal, else
64 * assume decimal; if base is already 16, allow 0x.
78 if ((base == 0 || base == 16) &&
79 c == '0' && (*s == 'x' || *s == 'X')) {
85 base = c == '0' ? 8 : 10;
88 * See strtol for comments as to the logic used.
90 cutoff = __UINT_MAX / (__UINT)base;
91 cutlim = (int)(__UINT_MAX % (__UINT)base);
92 for (acc = 0, any = 0;; c = *s++) {
98 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
105 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
118 /* LINTED interface specification */
119 *endptr = __DECONST(char *, (any ? s - 1 : nptr));