_strtoul.h revision 1.9 
1/* $NetBSD: _strtoul.h,v 1.9 2015/11/13 16:02:07 christos 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		return(0);
71#else
72		panic("%s: invalid base %d", __func__, base);
73#endif
74	}
75
76	/*
77	 * Skip white space and pick up leading +/- sign if any.
78	 * If base is 0, allow 0x for hex and 0 for octal, else
79	 * assume decimal; if base is already 16, allow 0x.
80	 */
81	s = nptr;
82#if defined(_KERNEL) || defined(_STANDALONE) || \
83    defined(HAVE_NBTOOL_CONFIG_H) || defined(BCS_ONLY)
84	do {
85		c = *s++;
86	} while (isspace(c));
87#else
88	do {
89		c = *s++;
90	} while (isspace_l(c, loc));
91#endif
92	if (c == '-') {
93		neg = 1;
94		c = *s++;
95	} else {
96		neg = 0;
97		if (c == '+')
98			c = *s++;
99	}
100	if ((base == 0 || base == 16) &&
101	    c == '0' && (*s == 'x' || *s == 'X')) {
102		c = s[1];
103		s += 2;
104		base = 16;
105#if 0
106	} else if ((base == 0 || base == 2) &&
107	    c == '0' && (*s == 'b' || *s == 'B')) {
108		c = s[1];
109		s += 2;
110		base = 2;
111#endif
112	} else if (base == 0)
113		base = (c == '0' ? 8 : 10);
114
115	/*
116	 * See strtol for comments as to the logic used.
117	 */
118	cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
119	cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
120	for (acc = 0, any = 0;; c = *s++) {
121		if (c >= '0' && c <= '9')
122			i = c - '0';
123		else if (c >= 'a' && c <= 'z')
124			i = (c - 'a') + 10;
125		else if (c >= 'A' && c <= 'Z')
126			i = (c - 'A') + 10;
127		else
128			break;
129		if (i >= base)
130			break;
131		if (any < 0)
132			continue;
133		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
134			acc = __UINT_MAX;
135#if !defined(_KERNEL) && !defined(_STANDALONE)
136			any = -1;
137			errno = ERANGE;
138#else
139			any = 0;
140			break;
141#endif
142		} else {
143			any = 1;
144			acc *= (__UINT)base;
145			acc += i;
146		}
147	}
148	if (neg && any > 0)
149		acc = -acc;
150	if (endptr != NULL)
151		/* LINTED interface specification */
152		*endptr = __UNCONST(any ? s - 1 : nptr);
153	return(acc);
154}
155
156#if !defined(_KERNEL) && !defined(_STANDALONE) && \
157    !defined(HAVE_NBTOOL_CONFIG_H) && !defined(BCS_ONLY)
158__UINT
159_FUNCNAME(const char *nptr, char **endptr, int base)
160{
161	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, _current_locale());
162}
163
164__UINT
165INT_FUNCNAME(, _FUNCNAME, _l)(const char *nptr, char **endptr, int base, locale_t loc)
166{
167	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
168}
169#endif
170