2 /* $NetBSD: _strtoul.h,v 1.1 2008/08/20 12:42:26 joerg Exp $ */
5 * SPDX-License-Identifier: BSD-3-Clause
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34 * Original version ID:
35 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
39 * function template for strtoul, strtoull and strtoumax.
42 * _FUNCNAME : function name
43 * __UINT : return type
44 * __UINT_MAX : upper limit of the return type
48 _FUNCNAME(const char *nptr, char **endptr, int base)
53 int any, cutlim, i, neg;
55 /* check base value */
56 if (base && (base < 2 || base > 36)) {
57 #if !defined(_KERNEL) && !defined(_STANDALONE)
61 panic("%s: invalid base %d", __func__, base);
66 * Skip white space and pick up leading +/- sign if any.
67 * If base is 0, allow 0x for hex and 0 for octal, else
68 * assume decimal; if base is already 16, allow 0x.
82 if ((base == 0 || base == 16) &&
83 c == '0' && (*s == 'x' || *s == 'X')) {
89 base = (c == '0' ? 8 : 10);
92 * See strtol for comments as to the logic used.
94 cutoff = __UINT_MAX / (__UINT)base;
95 cutlim = (int)(__UINT_MAX % (__UINT)base);
96 for (acc = 0, any = 0;; c = *s++) {
100 i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
107 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
109 #if !defined(_KERNEL) && !defined(_STANDALONE)
125 /* LINTED interface specification */
126 *endptr = __DECONST(void *, any ? s - 1 : nptr);