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/*
* strtol.c - This file is part of the libc-8086 package for ELKS,
* Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <ctype.h>
#include <stdlib.h>
long int
strtol(const char *nptr, char **endptr, int base)
{
const char * ptr;
unsigned short negative;
long int number;
ptr=nptr;
while (isspace(*ptr))
ptr++;
negative=0;
if (*ptr=='-')
negative=1;
number=(long int)strtoul(nptr, endptr, base);
return (negative ? -number:number);
}
unsigned long int
strtoul(const char *nptr, char **endptr, int base)
{
unsigned long int number;
/* Sanity check the arguments */
if (base==1 || base>36 || base<0)
base=0;
/* advance beyond any leading whitespace */
while (isspace(*nptr))
nptr++;
/* check for optional '+' or '-' */
if (*nptr=='-')
nptr++;
else
if (*nptr=='+')
nptr++;
/* If base==0 and the string begins with "0x" then we're supposed
to assume that it's hexadecimal (base 16). */
else
if (base==0 && *nptr=='0')
if (toupper(*(nptr+1))=='X')
{
base=16;
nptr+=2;
}
/* If base==0 and the string begins with "0" but not "0x",
then we're supposed to assume that it's octal (base 8). */
else
{
base=8;
nptr++;
}
/* If base is still 0 (it was 0 to begin with and the string didn't begin
with "0"), then we are supposed to assume that it's base 10 */
if (base==0)
base=10;
number=0;
while (isalnum(*nptr))
{
number= (number*base)+((isalpha(*nptr) ? toupper(*nptr) : *nptr)
- (isdigit(*nptr) ? '0' : 'A' + 9));
nptr++;
if (*nptr>'0'+base)
break;
}
/* Some code is simply _impossible_ to write with -Wcast-qual .. :-\ */
if (endptr!=NULL)
*endptr=(char *)nptr;
/* All done */
return number;
}
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