1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/********************************************************************************
* *
* S t r i n g t o U n 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 unsigned long and int, with extra parameter
'ok' for conversion success.
*/
// Largest unsigned long value
#ifndef ULLONG_MAX
#define ULLONG_MAX FXULONG(18446744073709551615)
#endif
using namespace FX;
/*******************************************************************************/
namespace FX {
extern FXAPI FXulong __strtoull(const FXchar* beg,const FXchar** end=nullptr,FXint base=0,FXbool* ok=nullptr);
extern FXAPI FXuint __strtoul(const FXchar* beg,const FXchar** end=nullptr,FXint base=0,FXbool* ok=nullptr);
// Convert string to unsigned long
FXulong __strtoull(const FXchar *beg,const FXchar** end,FXint base,FXbool* ok){
const FXchar *s=beg;
FXulong cutoff=ULLONG_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[0])){
s++;
}
// Handle sign
if(*s=='-'){
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=ULLONG_MAX;
}
else{
if(neg) value=-(FXlong)value;
if(ok) *ok=true;
}
}
}
return value;
}
// Convert string to unsigned int
FXuint __strtoul(const FXchar* beg,const FXchar** end,FXint base,FXbool* ok){
FXulong value=__strtoull(beg,end,base,ok);
if(__unlikely(value>UINT_MAX)){
if(ok) *ok=false;
return UINT_MAX;
}
return (FXuint)value;
}
}
|
