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ntp 4.2.6p5

    1: /*
    2:  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
    3:  * Copyright (C) 2003  Internet Software Consortium.
    4:  *
    5:  * Permission to use, copy, modify, and/or distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
   10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
   11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
   12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
   14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   15:  * PERFORMANCE OF THIS SOFTWARE.
   16:  */
   17: 
   18: /*
   19:  * Copyright (c) 1990, 1993
   20:  *	The Regents of the University of California.  All rights reserved.
   21:  *
   22:  * Redistribution and use in source and binary forms, with or without
   23:  * modification, are permitted provided that the following conditions
   24:  * are met:
   25:  * 1. Redistributions of source code must retain the above copyright
   26:  *    notice, this list of conditions and the following disclaimer.
   27:  * 2. Redistributions in binary form must reproduce the above copyright
   28:  *    notice, this list of conditions and the following disclaimer in the
   29:  *    documentation and/or other materials provided with the distribution.
   30:  * 3. All advertising materials mentioning features or use of this software
   31:  *    must display the following acknowledgement:
   32:  *	This product includes software developed by the University of
   33:  *	California, Berkeley and its contributors.
   34:  * 4. Neither the name of the University nor the names of its contributors
   35:  *    may be used to endorse or promote products derived from this software
   36:  *    without specific prior written permission.
   37:  *
   38:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   39:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   40:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   41:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   42:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   43:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   44:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   45:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   46:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   47:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   48:  * SUCH DAMAGE.
   49:  */
   50: 
   51: /*! \file */
   52: #if defined(LIBC_SCCS) && !defined(lint)
   53: static char sccsid[] = "@(#)strtoul.c	8.1 (Berkeley) 6/4/93";
   54: #endif /* LIBC_SCCS and not lint */
   55: 
   56: /* $Id: strtoul.c,v 1.1.1.1 2012/05/29 12:08:38 misho Exp $ */
   57: 
   58: #include <config.h>
   59: 
   60: #include <limits.h>
   61: #include <ctype.h>
   62: #include <errno.h>
   63: 
   64: #include <isc/stdlib.h>
   65: #include <isc/util.h>
   66: 
   67: /*!
   68:  * Convert a string to an unsigned long integer.
   69:  *
   70:  * Ignores `locale' stuff.  Assumes that the upper and lower case
   71:  * alphabets and digits are each contiguous.
   72:  */
   73: unsigned long
   74: isc_strtoul(const char *nptr, char **endptr, int base) {
   75: 	const char *s = nptr;
   76: 	unsigned long acc;
   77: 	unsigned char c;
   78: 	unsigned long cutoff;
   79: 	int neg = 0, any, cutlim;
   80: 
   81: 	/*
   82: 	 * See strtol for comments as to the logic used.
   83: 	 */
   84: 	do {
   85: 		c = *s++;
   86: 	} while (isspace(c));
   87: 	if (c == '-') {
   88: 		neg = 1;
   89: 		c = *s++;
   90: 	} else if (c == '+')
   91: 		c = *s++;
   92: 	if ((base == 0 || base == 16) &&
   93: 	    c == '0' && (*s == 'x' || *s == 'X')) {
   94: 		c = s[1];
   95: 		s += 2;
   96: 		base = 16;
   97: 	}
   98: 	if (base == 0)
   99: 		base = c == '0' ? 8 : 10;
  100: 	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
  101: 	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
  102: 	for (acc = 0, any = 0;; c = *s++) {
  103: 		if (!isascii(c))
  104: 			break;
  105: 		if (isdigit(c))
  106: 			c -= '0';
  107: 		else if (isalpha(c))
  108: 			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
  109: 		else
  110: 			break;
  111: 		if (c >= base)
  112: 			break;
  113: 		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
  114: 			any = -1;
  115: 		else {
  116: 			any = 1;
  117: 			acc *= base;
  118: 			acc += c;
  119: 		}
  120: 	}
  121: 	if (any < 0) {
  122: 		acc = ULONG_MAX;
  123: 		errno = ERANGE;
  124: 	} else if (neg)
  125: 		acc = -acc;
  126: 	if (endptr != 0)
  127: 		DE_CONST(any ? s - 1 : nptr, *endptr);
  128: 	return (acc);
  129: }