root / prex-0.9.0 / usr / lib / libc / stdlib / strtoul.c @ 03e9c04a
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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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#include <limits.h> |
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#include <ctype.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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/*
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* Convert a string to an unsigned long integer.
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*
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* Ignores `locale' stuff. Assumes that the upper and lower case
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* alphabets and digits are each contiguous.
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*/
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unsigned long |
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strtoul(nptr, endptr, base) |
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const char *nptr; |
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char **endptr;
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register int base; |
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{ |
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const char *s; |
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unsigned long acc, cutoff; |
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int c;
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int neg, any, cutlim;
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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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s = nptr; |
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do {
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c = (unsigned char) *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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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) |
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base = c == '0' ? 8 : 10; |
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cutoff = ULONG_MAX / (unsigned long)base; |
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cutlim = (int)(ULONG_MAX % (unsigned long)base); |
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for (acc = 0, any = 0;; c = (unsigned char) *s++) { |
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if (isdigit(c))
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c -= '0';
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else if (isalpha(c)) |
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c -= isupper(c) ? 'A' - 10 : 'a' - 10; |
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else
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break;
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if (c >= 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 && c > cutlim)) {
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any = -1;
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acc = ULONG_MAX; |
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errno = ERANGE; |
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} else {
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any = 1;
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acc *= (unsigned long)base; |
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acc += c; |
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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 != 0) |
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/* LINTED interface specification */
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*endptr = (char *)(any ? s - 1 : nptr); |
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return (acc);
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} |