103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
|
/*******************************************************************************
|
||
|
|
||
|
Copyright(C) Jonas 'Sortie' Termansen 2011, 2013.
|
||
|
|
||
|
This file is part of the Sortix C Library.
|
||
|
|
||
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
||
|
it under the terms of the GNU Lesser General Public License as published by
|
||
|
the Free Software Foundation, either version 3 of the License, or (at your
|
||
|
option) any later version.
|
||
|
|
||
|
The Sortix C 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 Lesser General Public
|
||
|
License for more details.
|
||
|
|
||
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
||
|
stdlib/strtol.cpp
|
||
|
Converts integers represented as strings to binary representation.
|
||
|
|
||
|
*******************************************************************************/
|
||
|
|
||
|
#ifndef STRTOL
|
||
|
#define STRTOL strtol
|
||
|
#define STRTOL_INT long
|
||
|
#define STRTOL_INT_IS_UNSIGNED false
|
||
|
#endif
|
||
|
|
||
|
#include <ctype.h>
|
||
|
#include <inttypes.h>
|
||
|
#include <stddef.h>
|
||
|
#include <stdlib.h>
|
||
|
|
||
|
static int Debase(char c)
|
||
|
{
|
||
|
if ( '0' <= c && c <= '9' )
|
||
|
return c - '0';
|
||
|
if ( 'a' <= c && c <= 'z' )
|
||
|
return 10 + c - 'a';
|
||
|
if ( 'A' <= c && c <= 'Z' )
|
||
|
return 10 + c - 'A';
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
template <class INT, bool UNSIGNED>
|
||
|
INT ParseInteger(const char* str, char** endptr, int base)
|
||
|
{
|
||
|
const char* origstr = str;
|
||
|
int origbase = base;
|
||
|
while ( isspace(*str) ) { str++; }
|
||
|
if ( base < 0 || 36 < base )
|
||
|
{
|
||
|
if ( endptr )
|
||
|
*endptr = (char*) str;
|
||
|
return 0;
|
||
|
}
|
||
|
INT result = 0;
|
||
|
bool negative = false;
|
||
|
char c = *str;
|
||
|
if ( !UNSIGNED && c == '-' )
|
||
|
str++, negative = true;
|
||
|
if ( !UNSIGNED && c == '+' )
|
||
|
str++, negative = false;
|
||
|
if ( !base && str[0] == '0' )
|
||
|
{
|
||
|
if ( str[1] == 'x' || str[1] == 'X' )
|
||
|
str += 2, base = 16;
|
||
|
else if ( 0 <= Debase(str[1]) && Debase(str[1]) < 8 )
|
||
|
str++, base = 8;
|
||
|
}
|
||
|
if ( !base )
|
||
|
base = 10;
|
||
|
if ( origbase == 16 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
|
||
|
str += 2;
|
||
|
size_t numconvertedchars = 0;
|
||
|
while ( (c = *str ) )
|
||
|
{
|
||
|
int val = Debase(c);
|
||
|
if ( val < 0 )
|
||
|
break;
|
||
|
if ( base <= val )
|
||
|
break;
|
||
|
if ( !UNSIGNED && negative )
|
||
|
val = -val;
|
||
|
// TODO: Detect overflow!
|
||
|
result = result * (INT) base + (INT) val;
|
||
|
str++;
|
||
|
numconvertedchars++;
|
||
|
}
|
||
|
if ( !numconvertedchars )
|
||
|
str = origstr, result = 0;
|
||
|
if ( endptr )
|
||
|
*endptr = (char*) str;
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
extern "C" STRTOL_INT STRTOL(const char* str, char** endptr, int base)
|
||
|
{
|
||
|
return ParseInteger<STRTOL_INT, STRTOL_INT_IS_UNSIGNED>(str, endptr, base);
|
||
|
}
|