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bytebuffer.h (1371B)
1 struct bytebuffer {
2 char *buf;
3 int len;
4 int cap;
5 };
6
7 static void bytebuffer_reserve(struct bytebuffer *b, int cap) {
8 if (b->cap >= cap) {
9 return;
10 }
11
12 // prefer doubling capacity
13 if (b->cap * 2 >= cap) {
14 cap = b->cap * 2;
15 }
16
17 char *newbuf = realloc(b->buf, cap);
18 b->buf = newbuf;
19 b->cap = cap;
20 }
21
22 static void bytebuffer_init(struct bytebuffer *b, int cap) {
23 b->cap = 0;
24 b->len = 0;
25 b->buf = 0;
26
27 if (cap > 0) {
28 b->cap = cap;
29 b->buf = malloc(cap); // just assume malloc works always
30 }
31 }
32
33 static void bytebuffer_free(struct bytebuffer *b) {
34 if (b->buf)
35 free(b->buf);
36 }
37
38 static void bytebuffer_clear(struct bytebuffer *b) {
39 b->len = 0;
40 }
41
42 static void bytebuffer_append(struct bytebuffer *b, const char *data, int len) {
43 bytebuffer_reserve(b, b->len + len);
44 memcpy(b->buf + b->len, data, len);
45 b->len += len;
46 }
47
48 static void bytebuffer_puts(struct bytebuffer *b, const char *str) {
49 bytebuffer_append(b, str, strlen(str));
50 }
51
52 static void bytebuffer_resize(struct bytebuffer *b, int len) {
53 bytebuffer_reserve(b, len);
54 b->len = len;
55 }
56
57 static void bytebuffer_flush(struct bytebuffer *b, int fd) {
58 write(fd, b->buf, b->len);
59 bytebuffer_clear(b);
60 }
61
62 static void bytebuffer_truncate(struct bytebuffer *b, int n) {
63 if (n <= 0)
64 return;
65 if (n > b->len)
66 n = b->len;
67 const int nmove = b->len - n;
68 memmove(b->buf, b->buf+n, nmove);
69 b->len -= n;
70 }