[apple/libc.git] / stdlib / strtoull.c

/*-
 * Copyright (c) 1992, 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strtouq.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] =
  "$FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.5.2.1 2001/03/02 09:45:20 obrien Exp $";
#endif

#include <sys/types.h>

#include <limits.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>

/*
 * Convert a string to an unsigned long long integer.
 *
 * Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
unsigned long long
strtoull(nptr, endptr, base)
	const char *nptr;
	char **endptr;
	register int base;
{
	register const char *s = nptr;
	register unsigned long long acc;
	register unsigned char c;
	register unsigned long long qbase, cutoff;
	register int neg, any, cutlim;

	/*
	 * See strtoq for comments as to the logic used.
	 */
	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')) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = c == '0' ? 8 : 10;
	qbase = (unsigned)base;
	cutoff = (unsigned long long)ULLONG_MAX / qbase;
	cutlim = (unsigned long long)ULLONG_MAX % qbase;
	for (acc = 0, any = 0;; c = *s++) {
		if (!isascii(c))
			break;
		if (isdigit(c))
			c -= '0';
		else if (isalpha(c))
			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
		else
			break;
		if (c >= base)
			break;
		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
			any = -1;
		else {
			any = 1;
			acc *= qbase;
			acc += c;
		}
	}
	if (any < 0) {
		acc = ULLONG_MAX;
		errno = ERANGE;
	} else if (neg)
		acc = -acc;
	if (endptr != 0)
		*endptr = (char *)(any ? s - 1 : nptr);
	return (acc);
}
Commit	Line	Data
5b2abdfb	1	/*-
e9ce8d39 A	2	* Copyright (c) 1992, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
5b2abdfb A	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)strtouq.c 8.1 (Berkeley) 6/4/93";
	36	#endif /* LIBC_SCCS and not lint */
	37
	38	#if defined(LIBC_SCCS) && !defined(lint)
	39	static const char rcsid[] =
	40	"$FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.5.2.1 2001/03/02 09:45:20 obrien Exp $";
	41	#endif
e9ce8d39 A	42
	43	#include <sys/types.h>
	44
	45	#include <limits.h>
	46	#include <errno.h>
	47	#include <ctype.h>
	48	#include <stdlib.h>
	49
	50	/*
5b2abdfb	51	* Convert a string to an unsigned long long integer.
e9ce8d39 A	52	*
	53	* Ignores `locale' stuff. Assumes that the upper and lower case
	54	* alphabets and digits are each contiguous.
	55	*/
5b2abdfb A	56	unsigned long long
5b2abdfb A	57	strtoull(nptr, endptr, base)
e9ce8d39 A	58	const char *nptr;
	59	char **endptr;
	60	register int base;
	61	{
	62	register const char *s = nptr;
5b2abdfb A	63	register unsigned long long acc;
	64	register unsigned char c;
	65	register unsigned long long qbase, cutoff;
e9ce8d39 A	66	register int neg, any, cutlim;
	67
	68	/*
	69	* See strtoq for comments as to the logic used.
	70	*/
	71	s = nptr;
	72	do {
	73	c = *s++;
	74	} while (isspace(c));
	75	if (c == '-') {
	76	neg = 1;
	77	c = *s++;
5b2abdfb	78	} else {
e9ce8d39 A	79	neg = 0;
	80	if (c == '+')
	81	c = *s++;
	82	}
	83	if ((base == 0 \|\| base == 16) &&
	84	c == '0' && (s == 'x' \|\| s == 'X')) {
	85	c = s[1];
	86	s += 2;
	87	base = 16;
	88	}
	89	if (base == 0)
	90	base = c == '0' ? 8 : 10;
	91	qbase = (unsigned)base;
5b2abdfb A	92	cutoff = (unsigned long long)ULLONG_MAX / qbase;
5b2abdfb A	93	cutlim = (unsigned long long)ULLONG_MAX % qbase;
e9ce8d39	94	for (acc = 0, any = 0;; c = *s++) {
5b2abdfb A	95	if (!isascii(c))
5b2abdfb A	96	break;
e9ce8d39 A	97	if (isdigit(c))
	98	c -= '0';
	99	else if (isalpha(c))
	100	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
	101	else
	102	break;
	103	if (c >= base)
	104	break;
5b2abdfb	105	if (any < 0 \|\| acc > cutoff \|\| (acc == cutoff && c > cutlim))
e9ce8d39 A	106	any = -1;
	107	else {
	108	any = 1;
	109	acc *= qbase;
	110	acc += c;
	111	}
	112	}
	113	if (any < 0) {
5b2abdfb	114	acc = ULLONG_MAX;
e9ce8d39 A	115	errno = ERANGE;
	116	} else if (neg)
	117	acc = -acc;
	118	if (endptr != 0)
	119	endptr = (char )(any ? s - 1 : nptr);
	120	return (acc);
	121	}