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/********************************************************************************
* *
* S t r i n g t o S i g n e d L o n g C o n v e r s i o n *
* *
*********************************************************************************
* Copyright (C) 2005,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This 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. *
* *
* 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 Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "fxmath.h"
#include "fxascii.h"
#include "FXString.h"
/*
Notes:
- Thread-safe conversion of strings to signed long and int, with extra parameter
'ok' for conversion success.
*/
// Largest and smallest unsigned long value
#ifndef LLONG_MAX
#define LLONG_MAX FXLONG(9223372036854775807)
#endif
#ifndef LLONG_MIN
#define LLONG_MIN (-LLONG_MAX-FXLONG(1))
#endif
using namespace FX;
/*******************************************************************************/
namespace FX {
extern FXAPI FXlong __strtoll(const FXchar *beg,const FXchar** end=nullptr,FXint base=0,FXbool* ok=nullptr);
extern FXAPI FXint __strtol(const FXchar *beg,const FXchar** end=nullptr,FXint base=0,FXbool* ok=nullptr);
// Convert string to signed long
FXlong __strtoll(const FXchar *beg,const FXchar** end,FXint base,FXbool* ok){
const FXchar *s=beg;
FXulong cutoff=LLONG_MAX;
FXulong value=0;
FXint cutlim;
FXint digits=0;
FXint neg=0;
FXint ovf=0;
FXint v;
// Assume the worst
if(ok) *ok=false;
// No characters consumed
if(end) *end=s;
// Keep it reasonable
if(base<=36){
// Skip whitespace
while(Ascii::isSpace(*s)){
s++;
}
// Handle sign
if(*s=='-'){
cutoff++; // One higher:- 2's complement
neg=1;
s++;
}
else if(*s=='+'){
s++;
}
// Hex, binary, or octal start with 0x, 0b, or plain 0
if(s[0]=='0'){
if((base<=1 || base==16) && ((s[1]|0x20)=='x')){ base=16; s+=2; }
else if((base<=1 || base==2) && ((s[1]|0x20)=='b')){ base=2; s+=2; }
else if(base<=1){ base=8; }
}
// Default to decimal base
else if(base<=1){
base=10;
}
// Overflow check values
cutlim=cutoff%base;
cutoff=cutoff/base;
// Scan digits and aggregate number
while(0<=(v=Ascii::digitValue(*s)) && v<base){
if(!ovf){
if(value>cutoff || (value==cutoff && v>cutlim)) ovf=1;
value=value*base+v;
}
digits++;
s++;
}
// At least one digit was found
if(0<digits){
if(end) *end=s;
if(ovf){
value=neg?LLONG_MIN:LLONG_MAX;
}
else{
if(neg) value=-(FXlong)value;
if(ok) *ok=true;
}
}
}
return (FXlong)value;
}
// Convert string to signed int
FXint __strtol(const FXchar *beg,const FXchar** end,FXint base,FXbool* ok){
FXlong value=__strtoll(beg,end,base,ok);
if(__unlikely(value<INT_MIN)){
if(ok) *ok=false;
return INT_MIN;
}
if(__unlikely(value>INT_MAX)){
if(ok) *ok=false;
return INT_MAX;
}
return (FXint)value;
}
}
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