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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/* Copyright (C) 1989-2020 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or
(at your option) any later version.
groff 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 General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <string.h>
#include <stdio.h>
// Ensure that the first declaration of functions that are later
// declared as inline declares them as inline.
class string;
inline string operator+(const string &, const string &);
inline string operator+(const string &, const char *);
inline string operator+(const char *, const string &);
inline string operator+(const string &, char);
inline string operator+(char, const string &);
inline int operator==(const string &, const string &);
inline int operator!=(const string &, const string &);
class string {
public:
string();
string(const string &);
string(const char *);
string(const char *, int);
string(char);
~string();
string &operator=(const string &);
string &operator=(const char *);
string &operator=(char);
string &operator+=(const string &);
string &operator+=(const char *);
string &operator+=(char);
void append(const char *, int);
int length() const;
int empty() const;
int operator*() const;
string substring(int i, int n) const;
char &operator[](int);
char operator[](int) const;
void set_length(int i);
const char *contents() const;
int search(char) const;
char *extract() const;
void remove_spaces();
void clear();
void move(string &);
friend string operator+(const string &, const string &);
friend string operator+(const string &, const char *);
friend string operator+(const char *, const string &);
friend string operator+(const string &, char);
friend string operator+(char, const string &);
friend int operator==(const string &, const string &);
friend int operator!=(const string &, const string &);
friend int operator<=(const string &, const string &);
friend int operator<(const string &, const string &);
friend int operator>=(const string &, const string &);
friend int operator>(const string &, const string &);
private:
char *ptr;
int len;
int sz;
string(const char *, int, const char *, int); // for use by operator+
void grow1();
};
inline char &string::operator[](int i)
{
assert(i >= 0 && i < len);
return ptr[i];
}
inline char string::operator[](int i) const
{
assert(i >= 0 && i < len);
return ptr[i];
}
inline int string::length() const
{
return len;
}
inline int string::empty() const
{
return len == 0;
}
inline int string::operator*() const
{
return len;
}
inline const char *string::contents() const
{
return ptr;
}
inline string operator+(const string &s1, const string &s2)
{
return string(s1.ptr, s1.len, s2.ptr, s2.len);
}
inline string operator+(const string &s1, const char *s2)
{
#ifdef __GNUG__
if (s2 == 0)
return s1;
else
return string(s1.ptr, s1.len, s2, strlen(s2));
#else
return s2 == 0 ? s1 : string(s1.ptr, s1.len, s2, strlen(s2));
#endif
}
inline string operator+(const char *s1, const string &s2)
{
#ifdef __GNUG__
if (s1 == 0)
return s2;
else
return string(s1, strlen(s1), s2.ptr, s2.len);
#else
return s1 == 0 ? s2 : string(s1, strlen(s1), s2.ptr, s2.len);
#endif
}
inline string operator+(const string &s, char c)
{
return string(s.ptr, s.len, &c, 1);
}
inline string operator+(char c, const string &s)
{
return string(&c, 1, s.ptr, s.len);
}
inline int operator==(const string &s1, const string &s2)
{
return (s1.len == s2.len
&& (s1.len == 0 || memcmp(s1.ptr, s2.ptr, s1.len) == 0));
}
inline int operator!=(const string &s1, const string &s2)
{
return (s1.len != s2.len
|| (s1.len != 0 && memcmp(s1.ptr, s2.ptr, s1.len) != 0));
}
inline string string::substring(int i, int n) const
{
assert(i >= 0 && i + n <= len);
return string(ptr + i, n);
}
inline string &string::operator+=(char c)
{
if (len >= sz)
grow1();
ptr[len++] = c;
return *this;
}
void put_string(const string &, FILE *);
string as_string(int);
|
