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comparison help2html/buffer.c @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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-1:000000000000 0:13d2b8934445
1 #include <stdlib.h>
2 #include <string.h>
3 #include <assert.h>
4
5 #include "must.h"
6 #include "buffer.h"
7
8 static void buffer_provide(struct buffer *b, size_t needed) {
9 if (needed <= b->allocsize) {
10 return;
11 }
12 size_t newalloc = b->allocsize*2;
13 if (newalloc < 16) {
14 newalloc = 16;
15 }
16 while (newalloc < needed) {
17 newalloc *= 2;
18 }
19
20 b->text = must_realloc(b->text, newalloc);
21 b->allocsize = newalloc;
22 }
23
24 void buffer_clear(struct buffer *b) {
25 b->len = 0;
26 b->text[b->len] = 0;
27 }
28
29 void buffer_init(struct buffer *b) {
30 b->allocsize = 16;
31 b->text = must_malloc(b->allocsize);
32 buffer_clear(b);
33 }
34
35 void buffer_cleanup(struct buffer *b) {
36 free(b->text);
37 b->text = NULL;
38 b->len = 0;
39 b->allocsize = 0;
40 }
41
42 void buffer_append(struct buffer *b, const char *t) {
43 size_t tlen = strlen(t);
44 buffer_provide(b, b->len + tlen + 1);
45 strcpy(b->text + b->len, t);
46 b->len += tlen;
47 }
48
49 void buffer_add(struct buffer *b, int ch) {
50 buffer_provide(b, b->len + 2);
51 b->text[b->len++] = ch;
52 b->text[b->len] = 0;
53 }
54
55 void buffer_start(struct buffer *b, int ch) {
56 buffer_clear(b);
57 buffer_add(b, ch);
58 }