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
|
/* Copyright (C) 2018 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <wchar.h>
#include "edi.h"
static struct Block *blockAlloc(struct Block *prev, size_t cap) {
size_t size = sizeof(struct Block) + sizeof(wchar_t) * cap;
struct Block *block = malloc(size);
if (!block) err(EX_OSERR, "malloc");
block->prev = prev;
return block;
}
struct Buffer bufferAlloc(size_t cap) {
struct Block *block = blockAlloc(NULL, cap);
return (struct Buffer) {
.cap = cap,
.len = 0,
.slice = { block->chars, 0 },
.block = block,
};
}
void bufferFree(struct Buffer *buf) {
struct Block *prev;
for (struct Block *it = buf->block; it; it = prev) {
prev = it->prev;
free(it);
}
}
void bufferInsert(struct Buffer *buf) {
buf->slice.ptr = &buf->block->chars[buf->len];
buf->slice.len = 0;
}
void bufferAppend(struct Buffer *buf, wchar_t ch) {
if (buf->len == buf->cap) {
if (buf->slice.len == buf->cap) buf->cap *= 2;
struct Block *block = blockAlloc(buf->block, buf->cap);
memcpy(block->chars, buf->slice.ptr, sizeof(wchar_t) * buf->slice.len);
buf->len = buf->slice.len;
buf->slice.ptr = block->chars;
buf->block = block;
}
buf->block->chars[buf->len++] = ch;
buf->slice.len++;
}
void bufferDelete(struct Buffer *buf) {
if (!buf->slice.len) return;
buf->slice.len--;
buf->len--;
}
wchar_t *bufferDest(struct Buffer *buf, size_t len) {
if (buf->len + len > buf->cap) {
if (!buf->len) {
buf->block = buf->block->prev;
free(buf->block);
}
while (len > buf->cap) buf->cap *= 2;
buf->block = blockAlloc(buf->block, buf->cap);
buf->len = 0;
}
wchar_t *ptr = &buf->block->chars[buf->len];
buf->slice.ptr = ptr;
buf->slice.len = len;
buf->len += len;
return ptr;
}
#ifdef TEST
#include <assert.h>
int main() {
struct Buffer buf = bufferAlloc(6);
bufferInsert(&buf);
bufferAppend(&buf, L'A');
bufferAppend(&buf, L'B');
assert(!wcsncmp(L"AB", buf.slice.ptr, buf.slice.len));
bufferInsert(&buf);
bufferAppend(&buf, L'C');
bufferAppend(&buf, L'D');
assert(!wcsncmp(L"CD", buf.slice.ptr, buf.slice.len));
bufferInsert(&buf);
bufferAppend(&buf, L'E');
bufferAppend(&buf, L'F');
bufferAppend(&buf, L'G');
bufferAppend(&buf, L'H');
assert(!wcsncmp(L"EFGH", buf.slice.ptr, buf.slice.len));
bufferFree(&buf);
buf = bufferAlloc(4);
bufferInsert(&buf);
bufferAppend(&buf, L'A');
bufferAppend(&buf, L'B');
bufferAppend(&buf, L'C');
bufferAppend(&buf, L'D');
bufferAppend(&buf, L'E');
bufferAppend(&buf, L'F');
assert(!wcsncmp(L"ABCDEF", buf.slice.ptr, buf.slice.len));
bufferFree(&buf);
buf = bufferAlloc(4);
bufferInsert(&buf);
bufferAppend(&buf, L'A');
bufferAppend(&buf, L'B');
bufferDelete(&buf);
assert(!wcsncmp(L"A", buf.slice.ptr, buf.slice.len));
bufferAppend(&buf, L'C');
assert(!wcsncmp(L"AC", buf.slice.ptr, buf.slice.len));
bufferFree(&buf);
buf = bufferAlloc(4);
wchar_t *dest = bufferDest(&buf, 2);
dest[0] = L'A';
dest[1] = L'B';
assert(!wcsncmp(L"AB", buf.slice.ptr, buf.slice.len));
dest = bufferDest(&buf, 3);
dest[0] = L'C';
dest[1] = L'D';
dest[2] = L'E';
assert(!wcsncmp(L"CDE", buf.slice.ptr, buf.slice.len));
bufferFree(&buf);
buf = bufferAlloc(4);
dest = bufferDest(&buf, 6);
dest[0] = L'A';
dest[1] = L'B';
dest[2] = L'C';
dest[3] = L'D';
dest[4] = L'E';
dest[5] = L'F';
assert(!wcsncmp(L"ABCDEF", buf.slice.ptr, buf.slice.len));
bufferFree(&buf);
}
#endif
|