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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
<HTML>
<HEAD>
<TITLE>HTChunk: Flexible array handling for libwww</TITLE></HEAD>
<BODY>
<H1>Chunk handling: Flexible arrays</H1>
This module implements a flexible array. It is a general utility module.
A chunk is a structure which may be extended. These routines create
and append data to chunks, automatically reallocating them as necessary.
It is garanteed that the array is '\0' terminated at all times, so the
terminating function, <A HREF="HTChunk.html#Terminate">HTChunkTerminate</A>
is only necessary to get the right size in the chunk structure.
<PRE>
#ifndef HTCHUNK_H
#define HTCHUNK_H
</PRE>
<PRE>typedef struct {
int size; /* In bytes */
int growby; /* Allocation unit in bytes */
int allocated; /* Current size of *data */
char * data; /* Pointer to malloced area or 0 */
} HTChunk;
#ifdef SHORT_NAMES
#define HTChunkClear HTChClea
#define HTChunkPutc HTChPutc
#define HTChunkPuts HTChPuts
#define HTChunkCreate HTChCrea
#define HTChunkTerminate HTChTerm
#define HTChunkEnsure HtChEnsu
#endif
</PRE>
<H2>Create new chunk</H2>
<H3>On entry,</H3>
<DL>
<DT>growby
<DD> The number of bytes to allocate
at a time when the chunk is later
extended. Arbitrary but normally
a trade-off time vs. memory
</DL>
<H3>On exit,</H3>
<DL>
<DT>returns
<DD> A chunk pointer to the new
chunk,
</DL>
<PRE>
extern HTChunk * HTChunkCreate PARAMS((int growby));
</PRE>
<H2>Free a chunk</H2>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
</DL>
<H3>On exit,</H3>
<DL>
<DT>ch
<DD> is invalid and may not be used.
</DL>
<PRE>
extern void HTChunkFree PARAMS((HTChunk * ch));
</PRE>
<H2>Clear a chunk</H2>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
</DL>
<H3>On exit,</H3>
<DL>
<DT>*ch
<DD> The size of the chunk is zero.
</DL>
<PRE>
extern void HTChunkClear PARAMS((HTChunk * ch));
</PRE>
<H2>Ensure a chunk has a certain space
in</H2>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
<DT>s
<DD> The size required
</DL>
<H3>On exit,</H3>
<DL>
<DT>*ch
<DD> Has size at least s
</DL>
<PRE>
extern void HTChunkEnsure PARAMS((HTChunk * ch, int s));
</PRE>
<H2>Append a character to a chunk</H2>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
<DT>c
<DD> The character to be appended
</DL>
<H3>On exit,</H3>
<DL>
<DT>*ch
<DD> Is one character bigger
</DL>
<PRE>extern void HTChunkPutc PARAMS((HTChunk * ch, char c));
</PRE>
<H2>Append a string to a chunk</H2>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
<DT>str
<DD> Tpoints to a zero-terminated
string to be appended
</DL>
<H3>On exit,</H3>
<DL>
<DT>*ch
<DD> Is bigger by strlen(str)
</DL>
<PRE>
extern void HTChunkPuts PARAMS((HTChunk * ch, const char *str));
</PRE>
<A NAME="Terminate"><H2>Append a zero character to a chunk</H2></A>
<PRE>
</PRE>
<H3>On entry,</H3>
<DL>
<DT>ch
<DD> A valid chunk pointer made by
HTChunkCreate()
</DL>
<H3>On exit,</H3>
<DL>
<DT>*ch
<DD> Is one character bigger
</DL>
<PRE>
extern void HTChunkTerminate PARAMS((HTChunk * ch));
#endif
</PRE>end</A></BODY>
</HTML>
|
