[apple/libc.git] / stdlib / FreeBSD / 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.
 * 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[] = "@(#)strtol.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtol.c,v 1.20 2007/01/09 00:28:10 imp Exp $");

#include "xlocale_private.h"

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


/*
 * Convert a string to a long integer.
 *
 * Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
long
strtol_l(const char * __restrict nptr, char ** __restrict endptr, int base,
    locale_t loc)
{
	const char *s;
	unsigned long acc;
	char c;
	unsigned long cutoff;
	int neg, any, cutlim;

	NORMALIZE_LOCALE(loc);
	/*
	 * 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.
	 */
	s = nptr;
	do {
		c = *s++;
	} while (isspace_l((unsigned char)c, loc));
	if (c == '-') {
		neg = 1;
		c = *s++;
	} else {
		neg = 0;
		if (c == '+')
			c = *s++;
	}
	if ((base == 0 || base == 16) &&
	    c == '0' && (*s == 'x' || *s == 'X') &&
	    ((s[1] >= '0' && s[1] <= '9') ||
	    (s[1] >= 'A' && s[1] <= 'F') ||
	    (s[1] >= 'a' && s[1] <= 'f'))) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = c == '0' ? 8 : 10;
	acc = any = 0;
	if (base < 2 || base > 36)
		goto noconv;

	/*
	 * 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) + LONG_MAX
	    : LONG_MAX;
	cutlim = cutoff % base;
	cutoff /= base;
	for ( ; ; c = *s++) {
		if (c >= '0' && c <= '9')
			c -= '0';
		else if (c >= 'A' && c <= 'Z')
			c -= 'A' - 10;
		else if (c >= 'a' && c <= 'z')
			c -= '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 (!any) {
noconv:
		errno = EINVAL;
	} else if (neg)
		acc = -acc;
	if (endptr != NULL)
		*endptr = (char *)(any ? s - 1 : nptr);
	return (acc);
}

long
strtol(const char * __restrict nptr, char ** __restrict endptr, int base)
{
	return strtol_l(nptr, endptr, base, __current_locale());
}
Commit	Line	Data
5b2abdfb	1	/*-
9385eb3d	2	* Copyright (c) 1990, 1993
e9ce8d39 A	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.
e9ce8d39 A	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
5b2abdfb	30	#if defined(LIBC_SCCS) && !defined(lint)
9385eb3d	31	static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93";
5b2abdfb	32	#endif /* LIBC_SCCS and not lint */
9385eb3d	33	#include <sys/cdefs.h>
1f2f436a	34	__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtol.c,v 1.20 2007/01/09 00:28:10 imp Exp $");
e9ce8d39	35
ad3c9f2a A	36	#include "xlocale_private.h"
ad3c9f2a A	37
e9ce8d39	38	#include <limits.h>
e9ce8d39	39	#include <ctype.h>
9385eb3d	40	#include <errno.h>
e9ce8d39 A	41	#include <stdlib.h>
e9ce8d39 A	42
9385eb3d	43
e9ce8d39	44	/*
9385eb3d	45	* Convert a string to a long integer.
e9ce8d39	46	*
9385eb3d	47	* Assumes that the upper and lower case
e9ce8d39 A	48	* alphabets and digits are each contiguous.
e9ce8d39 A	49	*/
9385eb3d	50	long
ad3c9f2a A	51	strtol_l(const char * __restrict nptr, char ** __restrict endptr, int base,
ad3c9f2a A	52	locale_t loc)
e9ce8d39	53	{
9385eb3d A	54	const char *s;
	55	unsigned long acc;
	56	char c;
	57	unsigned long cutoff;
	58	int neg, any, cutlim;
e9ce8d39	59
ad3c9f2a	60	NORMALIZE_LOCALE(loc);
e9ce8d39 A	61	/*
	62	* Skip white space and pick up leading +/- sign if any.
	63	* If base is 0, allow 0x for hex and 0 for octal, else
	64	* assume decimal; if base is already 16, allow 0x.
	65	*/
	66	s = nptr;
	67	do {
	68	c = *s++;
ad3c9f2a	69	} while (isspace_l((unsigned char)c, loc));
e9ce8d39 A	70	if (c == '-') {
	71	neg = 1;
	72	c = *s++;
	73	} else {
	74	neg = 0;
	75	if (c == '+')
	76	c = *s++;
	77	}
	78	if ((base == 0 \|\| base == 16) &&
1f2f436a A	79	c == '0' && (s == 'x' \|\| s == 'X') &&
	80	((s[1] >= '0' && s[1] <= '9') \|\|
	81	(s[1] >= 'A' && s[1] <= 'F') \|\|
	82	(s[1] >= 'a' && s[1] <= 'f'))) {
e9ce8d39 A	83	c = s[1];
	84	s += 2;
	85	base = 16;
	86	}
	87	if (base == 0)
	88	base = c == '0' ? 8 : 10;
9385eb3d A	89	acc = any = 0;
	90	if (base < 2 \|\| base > 36)
	91	goto noconv;
e9ce8d39 A	92
	93	/*
	94	* Compute the cutoff value between legal numbers and illegal
	95	* numbers. That is the largest legal value, divided by the
	96	* base. An input number that is greater than this value, if
	97	* followed by a legal input character, is too big. One that
	98	* is equal to this value may be valid or not; the limit
	99	* between valid and invalid numbers is then based on the last
9385eb3d A	100	* digit. For instance, if the range for longs is
	101	* [-2147483648..2147483647] and the input base is 10,
	102	* cutoff will be set to 214748364 and cutlim to either
	103	* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
	104	* a value > 214748364, or equal but the next digit is > 7 (or 8),
	105	* the number is too big, and we will return a range error.
e9ce8d39	106	*
9385eb3d	107	* Set 'any' if any `digits' consumed; make it negative to indicate
e9ce8d39 A	108	* overflow.
e9ce8d39 A	109	*/
9385eb3d A	110	cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
	111	: LONG_MAX;
	112	cutlim = cutoff % base;
	113	cutoff /= base;
	114	for ( ; ; c = *s++) {
	115	if (c >= '0' && c <= '9')
e9ce8d39	116	c -= '0';
9385eb3d A	117	else if (c >= 'A' && c <= 'Z')
	118	c -= 'A' - 10;
	119	else if (c >= 'a' && c <= 'z')
	120	c -= 'a' - 10;
e9ce8d39 A	121	else
	122	break;
	123	if (c >= base)
	124	break;
5b2abdfb	125	if (any < 0 \|\| acc > cutoff \|\| (acc == cutoff && c > cutlim))
e9ce8d39 A	126	any = -1;
	127	else {
	128	any = 1;
9385eb3d	129	acc *= base;
e9ce8d39 A	130	acc += c;
	131	}
	132	}
	133	if (any < 0) {
9385eb3d	134	acc = neg ? LONG_MIN : LONG_MAX;
e9ce8d39	135	errno = ERANGE;
9385eb3d A	136	} else if (!any) {
	137	noconv:
	138	errno = EINVAL;
e9ce8d39 A	139	} else if (neg)
e9ce8d39 A	140	acc = -acc;
9385eb3d	141	if (endptr != NULL)
e9ce8d39 A	142	endptr = (char )(any ? s - 1 : nptr);
	143	return (acc);
	144	}
ad3c9f2a A	145
	146	long
	147	strtol(const char * __restrict nptr, char ** __restrict endptr, int base)
	148	{
	149	return strtol_l(nptr, endptr, base, __current_locale());
	150	}