php-src/Zend/zend_strtol.c

/*-
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#include <zend.h>
#include <limits.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <unicode/utypes.h>
#include <unicode/uchar.h>

/* long zend_u_strtol (const UChar *nptr, UChar **endptr, int base) {{{ 
 * Convert a Unicode string to a long integer.
 *
 * Ignores `locale' stuff.
 */
ZEND_API long zend_u_strtol(nptr, endptr, base)
	const UChar *nptr;
	UChar **endptr;
	register int base;
{
	register const UChar *s = nptr;
	register unsigned long acc;
	register UChar c;
	register unsigned long cutoff;
	register int neg = 0, any, cutlim;

	if (s == NULL) {
		errno = ERANGE;
		if (endptr != NULL) {
			*endptr = NULL;
		}
		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.
	 */
	do {
		c = *s++;
	} while (u_isspace(c));
	if (c == 0x2D /*'-'*/) {
		neg = 1;
		c = *s++;
	} else if (c == 0x2B /*'+'*/)
		c = *s++;
	if ((base == 0 || base == 16) &&
	    (c == 0x30 /*'0'*/)
		 && (*s == 0x78 /*'x'*/ || *s == 0x58 /*'X'*/)) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = (c == 0x30 /*'0'*/) ? 8 : 10;

	/*
	 * Compute the cutoff value between legal numbers and illegal
	 * numbers.  That is the largest legal value, divided by the
	 * base.  An input number that is greater than this value, if
	 * followed by a legal input character, is too big.  One that
	 * is equal to this value may be valid or not; the limit
	 * between valid and invalid numbers is then based on the last
	 * digit.  For instance, if the range for longs is
	 * [-2147483648..2147483647] and the input base is 10,
	 * cutoff will be set to 214748364 and cutlim to either
	 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
	 * a value > 214748364, or equal but the next digit is > 7 (or 8),
	 * the number is too big, and we will return a range error.
	 *
	 * Set any if any `digits' consumed; make it negative to indicate
	 * overflow.
	 */
	cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
	cutlim = cutoff % (unsigned long)base;
	cutoff /= (unsigned long)base;
	for (acc = 0, any = 0;; c = *s++) {
		if (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/)
			c -= 0x30 /*'0'*/;
		else if (c >= 0x41 /*'A'*/ && c <= 0x5A /*'Z'*/)
			c -= 0x41 /*'A'*/ - 10;
		else if (c >= 0x61 /*'a'*/ && c <= 0x7A /*'z'*/)
			c -= 0x61 /*'a'*/ - 10;
		else
			break;
		if (c >= base)
			break;

		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
			any = -1;
		else {
			any = 1;
			acc *= base;
			acc += c;
		}
	}
	if (any < 0) {
		acc = neg ? LONG_MIN : LONG_MAX;
		errno = ERANGE;
	} else if (neg)
		acc = -acc;
	if (endptr != NULL)
		*endptr = (UChar *)(any ? s - 1 : nptr);
	return (acc);
}
/* }}} */

/* unsigned long zend_u_strtoul (const UChar *nptr, UChar **endptr, int base) {{{ 
 * Convert a Unicode string to a unsigned long integer.
 *
 * Ignores `locale' stuff.
 */
ZEND_API unsigned long zend_u_strtoul(nptr, endptr, base)
	const UChar *nptr;
	UChar **endptr;
	register int base;
{
	register const UChar *s = nptr;
	register unsigned long acc;
	register UChar c;
	register unsigned long cutoff;
	register int neg = 0, any, cutlim;

	if (s == NULL) {
		errno = ERANGE;
		if (endptr != NULL) {
			*endptr = NULL;
		}
		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.
	 */
	do {
		c = *s++;
	} while (u_isspace(c));
	if (c == 0x2D /*'-'*/) {
		neg = 1;
		c = *s++;
	} else if (c == 0x2B /*'+'*/)
		c = *s++;
	if ((base == 0 || base == 16) &&
	    (c == 0x30 /*'0'*/)
		 && (*s == 0x78 /*'x'*/ || *s == 0x58 /*'X'*/)) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = (c == 0x30 /*'0'*/) ? 8 : 10;

	/*
	 * Compute the cutoff value between legal numbers and illegal
	 * numbers.  That is the largest legal value, divided by the
	 * base.  An input number that is greater than this value, if
	 * followed by a legal input character, is too big.  One that
	 * is equal to this value may be valid or not; the limit
	 * between valid and invalid numbers is then based on the last
	 * digit.  For instance, if the range for longs is
	 * [-2147483648..2147483647] and the input base is 10,
	 * cutoff will be set to 214748364 and cutlim to either
	 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
	 * a value > 214748364, or equal but the next digit is > 7 (or 8),
	 * the number is too big, and we will return a range error.
	 *
	 * Set any if any `digits' consumed; make it negative to indicate
	 * overflow.
	 */
	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
	for (acc = 0, any = 0;; c = *s++) {
		if (c >= 0x30 /*'0'*/ && c <= 0x39 /*'9'*/)
			c -= 0x30 /*'0'*/;
		else if (c >= 0x41 /*'A'*/ && c <= 0x5A /*'Z'*/)
			c -= 0x41 /*'A'*/ - 10;
		else if (c >= 0x61 /*'a'*/ && c <= 0x7A /*'z'*/)
			c -= 0x61 /*'a'*/ - 10;
		else
			break;
		if (c >= base)
			break;

		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
			any = -1;
		else {
			any = 1;
			acc *= base;
			acc += c;
		}
	}
	if (any < 0) {
		acc = ULONG_MAX;
		errno = ERANGE;
	} else if (neg)
		acc = -acc;
	if (endptr != NULL)
		*endptr = (UChar *)(any ? s - 1 : nptr);
	return (acc);
}
/* }}} */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 */