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d9dc1603d6
This adds formatted input/output of binary integer numbers to the printf(), scanf(), and strtol() families, including their wide-character counterparts. Reviewed by: imp, emaste Differential Revision: https://reviews.freebsd.org/D41511
138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/* $NetBSD: _strtoul.h,v 1.1 2008/08/20 12:42:26 joerg Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Original version ID:
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* NetBSD: src/lib/libc/locale/_wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp
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*/
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/*
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* function template for strtoul, strtoull and strtoumax.
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*
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* parameters:
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* _FUNCNAME : function name
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* __UINT : return type
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* __UINT_MAX : upper limit of the return type
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*/
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__UINT
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_FUNCNAME(const char *nptr, char **endptr, int base)
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{
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const char *s;
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__UINT acc, cutoff;
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unsigned char c;
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int any, cutlim, i, neg;
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/* check base value */
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if (base && (base < 2 || base > 36)) {
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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errno = EINVAL;
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return (0);
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#else
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panic("%s: invalid base %d", __func__, base);
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#endif
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}
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/*
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* Skip white space and pick up leading +/- sign if any.
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* If base is 0, allow 0x for hex and 0 for octal, else
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* assume decimal; if base is already 16, allow 0x.
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*/
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s = nptr;
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do {
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c = *s++;
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} while (isspace(c));
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if (c == '-') {
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neg = 1;
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c = *s++;
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} else {
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neg = 0;
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if (c == '+')
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c = *s++;
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}
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if ((base == 0 || base == 16) &&
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c == '0' && (*s == 'x' || *s == 'X') &&
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((s[1] >= '0' && s[1] <= '9') ||
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(s[1] >= 'A' && s[1] <= 'F') ||
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(s[1] >= 'a' && s[1] <= 'f'))) {
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c = s[1];
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s += 2;
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base = 16;
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}
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if ((base == 0 || base == 2) &&
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c == '0' && (*s == 'b' || *s == 'B') &&
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(s[1] >= '0' && s[1] <= '1')) {
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c = s[1];
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s += 2;
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base = 2;
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}
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if (base == 0)
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base = (c == '0' ? 8 : 10);
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/*
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* See strtol for comments as to the logic used.
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*/
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cutoff = __UINT_MAX / (__UINT)base;
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cutlim = (int)(__UINT_MAX % (__UINT)base);
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for (acc = 0, any = 0;; c = *s++) {
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if (isdigit(c))
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i = c - '0';
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else if (isalpha(c))
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i = c - (isupper(c) ? 'A' - 10 : 'a' - 10);
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else
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break;
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if (i >= base)
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break;
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if (any < 0)
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continue;
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if (acc > cutoff || (acc == cutoff && i > cutlim)) {
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acc = __UINT_MAX;
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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any = -1;
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errno = ERANGE;
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#else
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any = 0;
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break;
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#endif
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} else {
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any = 1;
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acc *= (__UINT)base;
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acc += i;
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}
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}
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if (neg && any > 0)
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acc = -acc;
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if (endptr != NULL)
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/* LINTED interface specification */
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*endptr = __DECONST(void *, any ? s - 1 : nptr);
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return (acc);
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}
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