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/*

FUNCTION

   <>---string to long

INDEX

	strtol

INDEX

	_strtol_r

ANSI_SYNOPSIS

	#include 

        long strtol(const char *restrict <[s]>, char **restrict <[ptr]>,int <[base]>);

        long _strtol_r(void *<[reent]>,

                       const char *restrict <[s]>, char **restrict <[ptr]>,int <[base]>);

TRAD_SYNOPSIS

	#include 

	long strtol (<[s]>, <[ptr]>, <[base]>)

        char *<[s]>;

        char **<[ptr]>;

        int <[base]>;

	long _strtol_r (<[reent]>, <[s]>, <[ptr]>, <[base]>)

	char *<[reent]>;

        char *<[s]>;

        char **<[ptr]>;

        int <[base]>;

DESCRIPTION

The function <> converts the string <<*<[s]>>> to

a <>. First, it breaks down the string into three parts:

leading whitespace, which is ignored; a subject string consisting

of characters resembling an integer in the radix specified by <[base]>;

and a trailing portion consisting of zero or more unparseable characters,

and always including the terminating null character. Then, it attempts

to convert the subject string into a <> and returns the

result.

If the value of <[base]> is 0, the subject string is expected to look

like a normal C integer constant: an optional sign, a possible `<<0x>>'

indicating a hexadecimal base, and a number. If <[base]> is between

2 and 36, the expected form of the subject is a sequence of letters

and digits representing an integer in the radix specified by <[base]>,

with an optional plus or minus sign. The letters <>--<> (or,

equivalently, <>--<>) are used to signify values from 10 to 35;

only letters whose ascribed values are less than <[base]> are

permitted. If <[base]> is 16, a leading <<0x>> is permitted.

The subject sequence is the longest initial sequence of the input

string that has the expected form, starting with the first

non-whitespace character.  If the string is empty or consists entirely

of whitespace, or if the first non-whitespace character is not a

permissible letter or digit, the subject string is empty.

If the subject string is acceptable, and the value of <[base]> is zero,

<> attempts to determine the radix from the input string. A

string with a leading <<0x>> is treated as a hexadecimal value; a string with

a leading 0 and no <> is treated as octal; all other strings are

treated as decimal. If <[base]> is between 2 and 36, it is used as the

conversion radix, as described above. If the subject string begins with

a minus sign, the value is negated. Finally, a pointer to the first

character past the converted subject string is stored in <[ptr]>, if

<[ptr]> is not <>.

If the subject string is empty (or not in acceptable form), no conversion

is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is

not <>).

The alternate function <<_strtol_r>> is a reentrant version.  The

extra argument <[reent]> is a pointer to a reentrancy structure.

RETURNS

<> returns the converted value, if any. If no conversion was

made, 0 is returned.

<> returns <> or <> if the magnitude of

the converted value is too large, and sets <> to <>.

PORTABILITY

<> is ANSI.

No supporting OS subroutines are required.

*/

/*-

 * Copyright (c) 1990 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 <_ansi.h>

#include 

#include 

#include 

#include 

#include 

/*

 * Convert a string to a long integer.

 *

 * Ignores `locale' stuff.  Assumes that the upper and lower case

 * alphabets and digits are each contiguous.

 */

long

_DEFUN (_strtol_r, (rptr, nptr, endptr, base),

	struct _reent *rptr _AND

	_CONST char *__restrict nptr _AND

	char **__restrict endptr _AND

	int base)

{

	register const unsigned char *s = (const unsigned char *)nptr;

	register unsigned long acc;

	register int c;

	register unsigned long cutoff;

	register int neg = 0, any, cutlim;

	/*

	 * 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 (isspace(c));

	if (c == '-') {

		neg = 1;

		c = *s++;

	} else 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;

	/*

	 * 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 (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 *= base;

			acc += c;

		}

	}

	if (any < 0) {

		acc = neg ? LONG_MIN : LONG_MAX;

		rptr->_errno = ERANGE;

	} else if (neg)

		acc = -acc;

	if (endptr != 0)

		*endptr = (char *) (any ? (char *)s - 1 : nptr);

	return (acc);

}

#ifndef _REENT_ONLY

long

_DEFUN (strtol, (s, ptr, base),

	_CONST char *__restrict s _AND

	char **__restrict ptr _AND

	int base)

{

	return _strtol_r (_REENT, s, ptr, base);

}

#endif