forked from KolibriOS/kolibrios
149 lines
5.2 KiB
C
149 lines
5.2 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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* DESCRIBE IT HERE!
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*
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****************************************************************************/
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#include "variety.h"
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#include "widechar.h"
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __WIDECHAR__
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#include <wctype.h>
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#else
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#include <ctype.h>
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#endif
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#include <errno.h>
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#include <limits.h>
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#include "seterrno.h"
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/*
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* this table is the largest value that can safely be multiplied
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* by the associated base without overflowing
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*/
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static unsigned long nearly_overflowing[] = {
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ULONG_MAX / 2, ULONG_MAX / 3, ULONG_MAX / 4, ULONG_MAX / 5,
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ULONG_MAX / 6, ULONG_MAX / 7, ULONG_MAX / 8, ULONG_MAX / 9,
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ULONG_MAX / 10, ULONG_MAX / 11, ULONG_MAX / 12, ULONG_MAX / 13,
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ULONG_MAX / 14, ULONG_MAX / 15, ULONG_MAX / 16, ULONG_MAX / 17,
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ULONG_MAX / 18, ULONG_MAX / 19, ULONG_MAX / 20, ULONG_MAX / 21,
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ULONG_MAX / 22, ULONG_MAX / 23, ULONG_MAX / 24, ULONG_MAX / 25,
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ULONG_MAX / 26, ULONG_MAX / 27, ULONG_MAX / 28, ULONG_MAX / 29,
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ULONG_MAX / 30, ULONG_MAX / 31, ULONG_MAX / 32, ULONG_MAX / 33,
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ULONG_MAX / 34, ULONG_MAX / 35, ULONG_MAX / 36
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};
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#define hexstr(p) (p[0] == '0' && (p[1] == 'x' || p[1] == 'X'))
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static int radix_value( CHAR_TYPE c )
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{
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if( c >= '0' && c <= '9' ) return( c - '0' );
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c = __F_NAME(tolower,towlower)(c);
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if( c >= 'a' && c <= 'i' ) return( c - 'a' + 10 );
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if( c >= 'j' && c <= 'r' ) return( c - 'j' + 19 );
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if( c >= 's' && c <= 'z' ) return( c - 's' + 28 );
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return( 37 );
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}
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static unsigned long int _stol( const CHAR_TYPE *nptr,CHAR_TYPE **endptr,int base,int who)
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{
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const CHAR_TYPE *p;
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const CHAR_TYPE *startp;
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int digit;
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unsigned long int value;
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unsigned long int prev_value;
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CHAR_TYPE sign;
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char overflow; /*overflow is used as a flag so it does not
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*need to be of type CHAR_TYPE */
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if( endptr != NULL ) *endptr = (CHAR_TYPE *)nptr;
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p = nptr;
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while( __F_NAME(isspace,iswspace)(*p) ) ++p;
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sign = *p;
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if( sign == '+' || sign == '-' ) ++p;
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if( base == 0 ) {
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if( hexstr(p) ) base = 16;
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else if( *p == '0' ) base = 8;
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else base = 10;
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}
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if( base < 2 || base > 36 ) {
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__set_errno( EDOM );
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return( 0 );
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}
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if( base == 16 ) {
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if( hexstr(p) ) p += 2; /* skip over '0x' */
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}
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startp = p;
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overflow = 0;
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value = 0;
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for(;;) {
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digit = radix_value( *p );
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if( digit >= base ) break;
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if( value > nearly_overflowing[base-2] ) overflow = 1;
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prev_value = value;
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value = value * base + digit;
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if( value < prev_value ) overflow = 1;
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++p;
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}
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if( p == startp ) p = nptr;
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if( endptr != NULL ) *endptr = (CHAR_TYPE *)p;
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if( who == 1 ) {
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if( value >= 0x80000000 ) {
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if( value == 0x80000000 && sign == '-' ) {
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; /* OK */
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} else {
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overflow = 1;
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}
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}
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}
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if( overflow ) {
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__set_errno( ERANGE );
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if( who == 0 ) return( ULONG_MAX );
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if( sign == '-' ) return( LONG_MIN );
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return( LONG_MAX );
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}
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if( sign == '-' ) value = - value;
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return( value );
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}
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_WCRTLINK unsigned long int __F_NAME(strtoul,wcstoul)( const CHAR_TYPE *nptr,
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CHAR_TYPE **endptr, int base )
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{
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return( _stol( nptr, endptr, base, 0 ) );
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}
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_WCRTLINK long int __F_NAME(strtol,wcstol)( const CHAR_TYPE *nptr, CHAR_TYPE **endptr, int base )
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{
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return( _stol( nptr, endptr, base, 1 ) );
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}
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