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/* $NetBSD: _strtoul.h,v 1.11 2017/07/06 21:08:44 joerg Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Original version ID:
* NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
*/
#include <assert.h>
/*
* function template for strtoul, strtoull and strtoumax.
*
* parameters:
* _FUNCNAME : function name
* __UINT : return type
* __UINT_MAX : upper limit of the return type
*/
__UINT
_FUNCNAME(const char *nptr, char **endptr, int base)
{
const char *s;
__UINT acc, cutoff;
unsigned char c;
int i, neg, any, cutlim;
assert(nptr != NULL);
/* endptr may be NULL */
/* check base value */
if (base && (base < 2 || base > 36)) {
errno = EINVAL;
if (endptr != NULL)
/* LINTED interface specification */
*endptr = (char *)(nptr);
return 0;
}
/*
* Skip white space and pick up leading +/- sign if any.
* If base is 0, allow 0x for hex and 0 for octal, else
* assume decimal; if base is already 16, allow 0x.
*/
s = nptr;
do {
c = *s++;
} while (isspace(c));
if (c == '-') {
neg = 1;
c = *s++;
} else {
neg = 0;
if (c == '+')
c = *s++;
}
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X') &&
((s[1] >= '0' && s[1] <= '9') ||
(s[1] >= 'a' && s[1] <= 'f') ||
(s[1] >= 'A' && s[1] <= 'F'))) {
c = s[1];
s += 2;
base = 16;
} else if (base == 0)
base = (c == '0' ? 8 : 10);
/*
* See strtol for comments as to the logic used.
*/
cutoff = ((__UINT)__UINT_MAX / (__UINT)base);
cutlim = (int)((__UINT)__UINT_MAX % (__UINT)base);
for (acc = 0, any = 0;; c = *s++) {
if (c >= '0' && c <= '9')
i = c - '0';
else if (c >= 'a' && c <= 'z')
i = (c - 'a') + 10;
else if (c >= 'A' && c <= 'Z')
i = (c - 'A') + 10;
else
break;
if (i >= base)
break;
if (any < 0)
continue;
if (acc > cutoff || (acc == cutoff && i > cutlim)) {
acc = __UINT_MAX;
any = -1;
errno = ERANGE;
} else {
any = 1;
acc *= (__UINT)base;
acc += i;
}
}
if (neg && any > 0)
acc = -acc;
if (endptr != NULL)
/* LINTED interface specification */
*endptr = (char *)(any ? s - 1 : nptr);
return(acc);
}
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