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//===========================================================================

//

//      strtol.cxx

//

//      ISO standard string to long int conversion function defined in

//      section 7.10.1.5 of the standard

//

//===========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

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// License. However the source code for this file must still be made available

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// this file might be covered by the GNU General Public License.

//

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//####ECOSGPLCOPYRIGHTEND####

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    jlarmour

// Contributors: 

// Date:         2000-04-30

// Purpose:     

// Description: 

// Usage:       

//

//####DESCRIPTIONEND####

//

//===========================================================================

//

// This code is based on original code with the following copyright:

//

/*-

 * 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. 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.

 */

// CONFIGURATION

#include <pkgconf/libc_stdlib.h>   // Configuration header

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/infra/cyg_trac.h>    // Tracing support

#include <cyg/infra/cyg_ass.h>     // Assertion support

#include <limits.h>                // Definition of LONG_MIN and LONG_MAX

#include <ctype.h>                 // Definition of many ctype functions

#include <errno.h>                 // Error code definitions

#include <stdlib.h>                // Header for all stdlib functions

                                   // (like this one)

// FUNCTIONS

//

// Convert a string to a long integer.

//

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

// alphabets and digits are each contiguous.

//

long

strtol( const char *nptr, char **endptr, int base )

{

    const char *s = nptr;

    unsigned long acc;

    int c;

    unsigned long cutoff;

    int neg = 0, any, cutlim;

    CYG_REPORT_FUNCNAMETYPE( "strtol", "returning long %d" );

    CYG_REPORT_FUNCARG3( "nptr=%08x, endptr=%08x, base=%d",

                         nptr, endptr, base );

    CYG_CHECK_DATA_PTR( nptr, "nptr is not a valid pointer!" );

    if (endptr != NULL)

        CYG_CHECK_DATA_PTR( endptr, "endptr is not a valid pointer!" );

    //

    // 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;

        errno = ERANGE;

    } else if (neg)

        acc = -acc;

    if (endptr != 0)

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

    CYG_REPORT_RETVAL ( acc );

    return acc;

} // strtol()

// EOF strtol.cxx