1/* $NetBSD: _strtoul.h,v 1.11 2017/07/06 21:08:44 joerg Exp $ */
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Original version ID:
32 * NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
33 */
34
35/*
36 * function template for strtoul, strtoull and strtoumax.
37 *
38 * parameters:
39 *	_FUNCNAME  : function name
40 *      __UINT     : return type
41 *      __UINT_MAX : upper limit of the return type
42 */
43#if defined(_KERNEL) || defined(_STANDALONE) || \
44    defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
45__UINT
46_FUNCNAME(const char *nptr, char **endptr, int base)
47#else
48#include <locale.h>
49#include "setlocale_local.h"
50#define INT_FUNCNAME_(pre, name, post)	pre ## name ## post
51#define INT_FUNCNAME(pre, name, post)	INT_FUNCNAME_(pre, name, post)
52
53static __UINT
54INT_FUNCNAME(_int_, _FUNCNAME, _l)(const char *nptr, char **endptr,
55				   int base, locale_t loc)
56#endif
57{
58	const char *s;
59	__UINT acc, cutoff;
60	unsigned char c;
61	int i, neg, any, cutlim;
62
63	_DIAGASSERT(nptr != NULL);
64	/* endptr may be NULL */
65
66	/* check base value */
67	if (base && (base < 2 || base > 36)) {
68#if !defined(_KERNEL) && !defined(_STANDALONE)
69		errno = EINVAL;
70		if (endptr != NULL)
71			/* LINTED interface specification */
72			*endptr = __UNCONST(nptr);
73		return 0;
74#else
75		panic("%s: invalid base %d", __func__, base);
76#endif
77	}
78
79	/*
80	 * Skip white space and pick up leading +/- sign if any.
81	 * If base is 0, allow 0x for hex and 0 for octal, else
82	 * assume decimal; if base is already 16, allow 0x.
83	 */
84	s = nptr;
85#if defined(_KERNEL) || defined(_STANDALONE) || \
86    defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
87	do {
88		c = *s++;
89	} while (isspace(c));
90#else
91	do {
92		c = *s++;
93	} while (isspace_l(c, loc));
94#endif
95	if (c == '-') {
96		neg = 1;
97		c = *s++;
98	} else {
99		neg = 0;
100		if (c == '+')
101			c = *s++;
102	}
103	if ((base == 0 || base == 16) &&
104	    c == '0' && (*s == 'x' || *s == 'X') &&
105	    ((s[1] >= '0' && s[1] <= '9') ||
106	     (s[1] >= 'a' && s[1] <= 'f') ||
107	     (s[1] >= 'A' && s[1] <= 'F'))) {
108		c = s[1];
109		s += 2;
110		base = 16;
111#if 0
112	} else if ((base == 0 || base == 2) &&
113	    c == '0' && (*s == 'b' || *s == 'B') &&
114	    (s[1] >= '0' && s[1] <= '1')) {
115		c = s[1];
116		s += 2;
117		base = 2;
118#endif
119	} else if (base == 0)
120		base = (c == '0' ? 8 : 10);
121
122	/*
123	 * See strtol for comments as to the logic used.
124	 */
125	cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
126	cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
127	for (acc = 0, any = 0;; c = *s++) {
128		if (c >= '0' && c <= '9')
129			i = c - '0';
130		else if (c >= 'a' && c <= 'z')
131			i = (c - 'a') + 10;
132		else if (c >= 'A' && c <= 'Z')
133			i = (c - 'A') + 10;
134		else
135			break;
136		if (i >= base)
137			break;
138		if (any < 0)
139			continue;
140		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
141			acc = __UINT_MAX;
142#if !defined(_KERNEL) && !defined(_STANDALONE)
143			any = -1;
144			errno = ERANGE;
145#else
146			any = 0;
147			break;
148#endif
149		} else {
150			any = 1;
151			acc *= (__UINT)base;
152			acc += i;
153		}
154	}
155	if (neg && any > 0)
156		acc = -acc;
157	if (endptr != NULL)
158		/* LINTED interface specification */
159		*endptr = __UNCONST(any ? s - 1 : nptr);
160	return(acc);
161}
162
163#if !defined(_KERNEL) && !defined(_STANDALONE) && \
164    !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
165__UINT
166_FUNCNAME(const char *nptr, char **endptr, int base)
167{
168	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
169}
170
171__UINT
172INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
173{
174	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
175}
176#endif
177