sl@0: /*
sl@0: FUNCTION
sl@0:    <<strtol>>---string to long
sl@0:    <<strtoul>>---string to unsigned long
sl@0: 
sl@0: INDEX
sl@0: 	strtol
sl@0: INDEX
sl@0: 	_strtol_r
sl@0: 
sl@0: ANSI_SYNOPSIS
sl@0: 	#include <stdlib.h>
sl@0:         long strtol(const char *<[s]>, char **<[ptr]>,int <[base]>);
sl@0:         unsigned long strtoul(const char *<[s]>, char **<[ptr]>,
sl@0:                               int <[base]>);
sl@0: 
sl@0: DESCRIPTION
sl@0: The function <<strtol>> converts the string <<*<[s]>>> to
sl@0: a <<long>>. First, it breaks down the string into three parts:
sl@0: leading whitespace, which is ignored; a subject string consisting
sl@0: of characters resembling an integer in the radix specified by <[base]>;
sl@0: and a trailing portion consisting of zero or more unparseable characters,
sl@0: and always including the terminating null character. Then, it attempts
sl@0: to convert the subject string into a <<long>> and returns the
sl@0: result.
sl@0: 
sl@0: If the value of <[base]> is 0, the subject string is expected to look
sl@0: like a normal C integer constant: an optional sign, a possible `<<0x>>'
sl@0: indicating a hexadecimal base, and a number. If <[base]> is between
sl@0: 2 and 36, the expected form of the subject is a sequence of letters
sl@0: and digits representing an integer in the radix specified by <[base]>,
sl@0: with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
sl@0: equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
sl@0: only letters whose ascribed values are less than <[base]> are
sl@0: permitted. If <[base]> is 16, a leading <<0x>> is permitted.
sl@0: 
sl@0: The subject sequence is the longest initial sequence of the input
sl@0: string that has the expected form, starting with the first
sl@0: non-whitespace character.  If the string is empty or consists entirely
sl@0: of whitespace, or if the first non-whitespace character is not a
sl@0: permissible letter or digit, the subject string is empty.
sl@0: 
sl@0: If the subject string is acceptable, and the value of <[base]> is zero,
sl@0: <<strtol>> attempts to determine the radix from the input string. A
sl@0: string with a leading <<0x>> is treated as a hexadecimal value; a string with
sl@0: a leading 0 and no <<x>> is treated as octal; all other strings are
sl@0: treated as decimal. If <[base]> is between 2 and 36, it is used as the
sl@0: conversion radix, as described above. If the subject string begins with
sl@0: a minus sign, the value is negated. Finally, a pointer to the first
sl@0: character past the converted subject string is stored in <[ptr]>, if
sl@0: <[ptr]> is not <<NULL>>.
sl@0: 
sl@0: If the subject string is empty (or not in acceptable form), no conversion
sl@0: is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
sl@0: not <<NULL>>).
sl@0: 
sl@0: The alternate function <<_strtol_r>> is a reentrant version.  The
sl@0: extra argument <[reent]> is a pointer to a reentrancy structure.
sl@0: 
sl@0: The function <<strtoul>> is similar but does not permit an optional sign
sl@0: and returns an <<unsigned long>>.
sl@0: 
sl@0: RETURNS
sl@0: <<strtol>> returns the converted value, if any. If no conversion was
sl@0: made, 0 is returned.
sl@0: 
sl@0: <<strtol>> returns <<LONG_MAX>> or <<LONG_MIN>> if the magnitude of
sl@0: the converted value is too large, and sets <<errno>> to <<ERANGE>>.
sl@0: 
sl@0: <<strtoul>> returns <<ULONG_MAX>> if the magnitude of the converted
sl@0: value is too large, and sets <<errno>> to <<ERANGE>>.
sl@0: 
sl@0: PORTABILITY
sl@0: <<strtol>> and <<strtoul>> are both ANSI.
sl@0: 
sl@0: No supporting OS subroutines are required.
sl@0:  */
sl@0: 
sl@0: /*-
sl@0:  * Copyright (c) 1990 The Regents of the University of California.
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *	This product includes software developed by the University of
sl@0:  *	California, Berkeley and its contributors.
sl@0:  * 4. Neither the name of the University nor the names of its contributors
sl@0:  *    may be used to endorse or promote products derived from this software
sl@0:  *    without specific prior written permission.
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include <_ansi.h>
sl@0: #include <limits.h>
sl@0: #include <ctype.h>
sl@0: #include <errno.h>
sl@0: #include <stdlib.h>
sl@0: #include <reent.h>
sl@0: 
sl@0: /*
sl@0:  * Convert a string to a long integer.
sl@0:  *
sl@0:  * Ignores `locale' stuff.  Assumes that the upper and lower case
sl@0:  * alphabets and digits are each contiguous.
sl@0:  */
sl@0: static unsigned long _do_strtoX (const char *nptr, char **endptr, int base, int issigned)
sl@0: {
sl@0: 	register const char *s = nptr;
sl@0: 	register unsigned long acc;
sl@0: 	register int c;
sl@0: 	register unsigned long cutoff;
sl@0: 	register int neg = 0, any, cutlim;
sl@0: 	register const unsigned long long_min = (unsigned long)LONG_MIN;
sl@0: 
sl@0: 	/*
sl@0: 	 * Skip white space and pick up leading +/- sign if any.
sl@0: 	 * If base is 0, allow 0x for hex and 0 for octal, else
sl@0: 	 * assume decimal; if base is already 16, allow 0x.
sl@0: 	 */
sl@0: 	do {
sl@0: 		c = *s++;
sl@0: 	} while (isspace(c));
sl@0: 	
sl@0: 	if ((c == '-')||(c == '+')) {
sl@0: 	    issigned = 1;
sl@0: 	}
sl@0: 	
sl@0: 	if (issigned) {
sl@0: 		if (c == '-') {
sl@0: 			neg = 1;
sl@0: 			c = *s++;
sl@0: 		} else if (c == '+')
sl@0: 			c = *s++;
sl@0: 	}
sl@0: 	if ((base == 0 || base == 16) &&
sl@0: 	    c == '0' && (*s == 'x' || *s == 'X')) {
sl@0: 		c = s[1];
sl@0: 		s += 2;
sl@0: 		base = 16;
sl@0: 	}
sl@0: 	if (base == 0)
sl@0: 		base = c == '0' ? 8 : 10;
sl@0: 
sl@0: 	/*
sl@0: 	 * Compute the cutoff value between legal numbers and illegal
sl@0: 	 * numbers.  That is the largest legal value, divided by the
sl@0: 	 * base.  An input number that is greater than this value, if
sl@0: 	 * followed by a legal input character, is too big.  One that
sl@0: 	 * is equal to this value may be valid or not; the limit
sl@0: 	 * between valid and invalid numbers is then based on the last
sl@0: 	 * digit.  For instance, if the range for longs is
sl@0: 	 * [-2147483648..2147483647] and the input base is 10,
sl@0: 	 * cutoff will be set to 214748364 and cutlim to either
sl@0: 	 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
sl@0: 	 * a value > 214748364, or equal but the next digit is > 7 (or 8),
sl@0: 	 * the number is too big, and we will return a range error.
sl@0: 	 *
sl@0: 	 * Set any if any `digits' consumed; make it negative to indicate
sl@0: 	 * overflow.
sl@0: 	 */
sl@0: 	if (issigned)
sl@0: 		cutoff = neg ? long_min : LONG_MAX;
sl@0: 	else
sl@0: 		cutoff = ULONG_MAX;
sl@0: 	cutlim = cutoff % (unsigned long)base;
sl@0: 	cutoff = cutoff / (unsigned long)base;
sl@0: 	for (acc = 0, any = 0;; c = *s++) {
sl@0: 		if (isdigit(c))
sl@0: 			c -= '0';
sl@0: 		else if (isalpha(c))
sl@0: 			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
sl@0: 		else
sl@0: 			break;
sl@0: 		if (c >= base)
sl@0: 			break;
sl@0: 		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
sl@0: 			any = -1;
sl@0: 		else {
sl@0: 			any = 1;
sl@0: 			acc *= base;
sl@0: 			acc += c;
sl@0: 		}
sl@0: 	}
sl@0: 	if (any < 0) {
sl@0: 		if (issigned)
sl@0: 			acc = neg ? LONG_MIN : LONG_MAX;
sl@0: 		else
sl@0: 			acc = ULONG_MAX;
sl@0: 		errno = ERANGE;
sl@0: 	} else if (neg)
sl@0: 		acc = (unsigned long)(-(long)acc);
sl@0: 	if (endptr != 0)
sl@0: 		*endptr = (char *) (any ? s - 1 : nptr);
sl@0: 	return (acc);
sl@0: }
sl@0: 
sl@0: /**
sl@0: Convert string to unsigned long integer.
sl@0: Parses string interpreting its content as an integer value 
sl@0: until a character that can not be interpreted is found,
sl@0: and returns an unsigned long value.
sl@0: @return The converted unsigned long value from the input string.
sl@0: If an error occurs or no conversion can be made 0 is returned.
sl@0: @param s String representing an integer number. 
sl@0: @param ptr Address of a pointer.
sl@0: This is filled by the function with the address where scan has ended. 
sl@0: Serves to determine where there is the first non-numerical character in the string. 
sl@0: @param base Numeral radix in which the number to be interpreted. 
sl@0: Must be 0 or be between 2 and 36. If it is 0 the radix of the string is determined 
sl@0: by the initial characters of the string:
sl@0: */
sl@0: EXPORT_C unsigned long strtoul (const char *s, char **ptr, int base)
sl@0: 	{
sl@0: 	return _do_strtoX (s, ptr, base, 0);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Convert string to long integer.
sl@0: @return The converted long int value from the input string.
sl@0: If an error occurs or no conversion can be made 0 is returned.
sl@0: @param s String representing an integer number. 
sl@0: @param ptr Address of a pointer. 
sl@0: This is filled by the function with the address where scan has ended. 
sl@0: @param base Numeral radix in which the number to be interpreted. 
sl@0: Must be 0 or be between 2 and 36. If it is 0 the radix of the string 
sl@0: is determined by the initial characters of the string
sl@0: */
sl@0: EXPORT_C long strtol (const char *s, char **ptr, int base)
sl@0: 	{
sl@0: 	return (long)_do_strtoX (s, ptr, base, 1);
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Convert string to integer.
sl@0: Parses string interpreting its content as a number and returns an int value.
sl@0: @return   The converted integer value of the input string.
sl@0: On overflow the result is undefined.
sl@0: If an error occurs 0 is returned.
sl@0: @param s String representing an integer number. 
sl@0: */
sl@0: EXPORT_C int atoi (const char *s)
sl@0: 	{
sl@0: 	return (int) _do_strtoX (s, NULL, 10, 1);
sl@0: 	}