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
|
#include <kmalloc.h>
#include <lib/sb.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#define DEFAULT_CAPACITY 256
void sb_init(struct sb *ctx) {
(void)sb_init_capacity(ctx, DEFAULT_CAPACITY);
}
int sb_init_capacity(struct sb *ctx, size_t starting_capacity) {
ctx->to_ignore = 0;
ctx->length = 0;
ctx->prebuffer = 0;
ctx->string = kmalloc(starting_capacity);
if (NULL == ctx->string) {
ctx->capacity = 0;
return 0;
}
ctx->capacity = starting_capacity;
return 1;
}
void sb_init_buffer(struct sb *ctx, char *buffer, size_t size) {
ctx->string = buffer;
ctx->capacity = size;
ctx->length = 0;
ctx->prebuffer = 1;
ctx->to_ignore = 0;
}
void sb_free(struct sb *ctx) {
if (ctx->prebuffer) {
ctx->length = 0;
return;
}
ctx->length = 0;
ctx->capacity = 0;
kfree(ctx->string);
ctx->string = NULL;
}
void sb_set_ignore(struct sb *ctx, size_t n) {
ctx->to_ignore = n;
}
void sb_reset(struct sb *ctx) {
ctx->length = 0;
ctx->to_ignore = 0;
}
int sb_isempty(const struct sb *ctx) {
return (0 == ctx->length);
}
int sb_increase_buffer(struct sb *ctx, size_t min) {
if (ctx->prebuffer) {
return 0;
}
size_t new_capacity = ctx->capacity + max(32, min);
char *new_allocation = krealloc(ctx->string, new_capacity);
if (!new_allocation) {
return 0;
}
ctx->string = new_allocation;
ctx->capacity = new_capacity;
return 1;
}
int sb_append_char(struct sb *ctx, char c) {
if (ctx->to_ignore > 0) {
ctx->to_ignore--;
return 1;
}
if (1 > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, 1)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, &c, 1);
ctx->length++;
return 1;
}
int sb_delete_right(struct sb *ctx, size_t n) {
n = min(n, ctx->length);
ctx->length -= n;
return n;
}
int sb_append(struct sb *ctx, const char *s) {
size_t l = strlen(s);
if (ctx->to_ignore >= l) {
ctx->to_ignore -= l;
return 1;
}
l -= ctx->to_ignore;
s += ctx->to_ignore;
ctx->to_ignore = 0;
if (l > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, l)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, s, l);
ctx->length += l;
return 1;
}
int sb_prepend_sv(struct sb *ctx, struct sv sv) {
return sb_prepend_buffer(ctx, sv.s, sv.length);
}
int sb_prepend_buffer(struct sb *ctx, const char *buffer, size_t length) {
if (ctx->to_ignore >= length) {
ctx->to_ignore -= length;
return 1;
}
length -= ctx->to_ignore;
buffer += ctx->to_ignore;
ctx->to_ignore = 0;
if (length > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, length)) {
return 0;
}
}
memmove(ctx->string + length, ctx->string, ctx->length);
memcpy(ctx->string, buffer, length);
ctx->length += length;
return 1;
}
int sb_append_buffer(struct sb *ctx, const char *buffer, size_t length) {
if (ctx->to_ignore >= length) {
ctx->to_ignore -= length;
return 1;
}
length -= ctx->to_ignore;
buffer += ctx->to_ignore;
ctx->to_ignore = 0;
if (length > ctx->capacity - ctx->length) {
if (!sb_increase_buffer(ctx, length)) {
return 0;
}
}
memcpy(ctx->string + ctx->length, buffer, length);
ctx->length += length;
return 1;
}
int sb_append_sv(struct sb *ctx, struct sv sv) {
return sb_append_buffer(ctx, sv.s, sv.length);
}
|
