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annotate help2html/buffer.c @ 3:e23ad76d0588

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Document the LaTeX packages used in the install notes.
author David A. Holland
date Sun, 26 Apr 2009 18:23:33 -0400
parents 13d2b8934445
children
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1 #include <stdlib.h>
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2 #include <string.h>
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3 #include <assert.h>
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4
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5 #include "must.h"
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6 #include "buffer.h"
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7
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8 static void buffer_provide(struct buffer *b, size_t needed) {
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9 if (needed <= b->allocsize) {
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10 return;
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11 }
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12 size_t newalloc = b->allocsize*2;
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13 if (newalloc < 16) {
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14 newalloc = 16;
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15 }
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16 while (newalloc < needed) {
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17 newalloc *= 2;
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18 }
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19
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20 b->text = must_realloc(b->text, newalloc);
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21 b->allocsize = newalloc;
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22 }
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23
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24 void buffer_clear(struct buffer *b) {
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25 b->len = 0;
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26 b->text[b->len] = 0;
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27 }
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28
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29 void buffer_init(struct buffer *b) {
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30 b->allocsize = 16;
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31 b->text = must_malloc(b->allocsize);
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32 buffer_clear(b);
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33 }
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34
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35 void buffer_cleanup(struct buffer *b) {
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36 free(b->text);
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37 b->text = NULL;
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38 b->len = 0;
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39 b->allocsize = 0;
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40 }
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41
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42 void buffer_append(struct buffer *b, const char *t) {
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43 size_t tlen = strlen(t);
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44 buffer_provide(b, b->len + tlen + 1);
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45 strcpy(b->text + b->len, t);
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46 b->len += tlen;
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47 }
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48
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49 void buffer_add(struct buffer *b, int ch) {
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50 buffer_provide(b, b->len + 2);
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51 b->text[b->len++] = ch;
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52 b->text[b->len] = 0;
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53 }
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54
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55 void buffer_start(struct buffer *b, int ch) {
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56 buffer_clear(b);
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57 buffer_add(b, ch);
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58 }