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
|
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "strbuf.h"
static void die(const char *format, ...)
{
va_list arg;
va_start(arg, format);
vfprintf(stderr, format, arg);
va_end(arg);
exit(-1);
}
void strbuf_init(strbuf_t *s)
{
s->buf = NULL;
s->size = 0;
s->length = 0;
s->increment = STRBUF_DEFAULT_INCREMENT;
s->dynamic = 0;
strbuf_resize(s, 0);
strbuf_ensure_null(s);
}
strbuf_t *strbuf_new()
{
strbuf_t *s;
s = malloc(sizeof(strbuf_t));
if (!s)
die("Out of memory");
strbuf_init(s);
/* Dynamic strbuf allocation / deallocation */
s->dynamic = 1;
return s;
}
void strbuf_set_increment(strbuf_t *s, int increment)
{
if (increment <= 0)
die("BUG: Invalid string increment");
s->increment = increment;
}
void strbuf_free(strbuf_t *s)
{
if (s->buf)
free(s->buf);
if (s->dynamic)
free(s);
}
char *strbuf_free_to_string(strbuf_t *s, int *len)
{
char *buf;
strbuf_ensure_null(s);
buf = s->buf;
if (len)
*len = s->length;
if (s->dynamic)
free(s);
return buf;
}
/* Ensure strbuf can handle a string length bytes long (ignoring NULL
* optional termination). */
void strbuf_resize(strbuf_t *s, int len)
{
int newsize;
/* Ensure there is room for optional NULL termination */
newsize = len + 1;
/* Round up to the next increment */
newsize = ((newsize + s->increment - 1) / s->increment) * s->increment;
s->size = newsize;
s->buf = realloc(s->buf, s->size);
if (!s->buf)
die("Out of memory");
}
void strbuf_append_mem(strbuf_t *s, const char *c, int len)
{
if (len > strbuf_empty_length(s))
strbuf_resize(s, s->length + len);
memcpy(s->buf + s->length, c, len);
s->length += len;
}
void strbuf_append_string(strbuf_t *s, const char *str)
{
int space, i;
space = strbuf_empty_length(s);
for (i = 0; str[i]; i++) {
if (space < 1) {
strbuf_resize(s, s->length + s->increment);
space = strbuf_empty_length(s);
}
s->buf[s->length] = str[i];
s->length++;
space--;
}
}
void strbuf_append_fmt(strbuf_t *s, const char *fmt, ...)
{
va_list arg;
int fmt_len, try;
int empty_len;
/* If the first attempt to append fails, resize the buffer appropriately
* and try again */
for (try = 0; ; try++) {
va_start(arg, fmt);
/* Append the new formatted string */
/* fmt_len is the length of the string required, excluding the
* trailing NULL */
empty_len = strbuf_empty_length(s);
/* Add 1 since there is also space to store the terminating NULL. */
fmt_len = vsnprintf(s->buf + s->length, empty_len + 1, fmt, arg);
va_end(arg);
if (fmt_len <= empty_len)
break; /* SUCCESS */
if (try > 0)
die("BUG: length of formatted string changed");
strbuf_resize(s, s->length + fmt_len);
}
s->length += fmt_len;
}
/* vi:ai et sw=4 ts=4:
*/
|
