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/* /Net/dxcern/userd/timbl/hypertext/WWW/Library/Implementation/HTChunk.html
CHUNK HANDLING:
FLEXIBLE ARRAYS
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.
*/
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
/*
Create new chunk
ON ENTRY,
growby The number of bytes to allocate at a time when the chunk is
later extended. Arbitrary but normally a trade-off time vs.
memory
ON EXIT,
returns A chunk pointer to the new chunk,
*/
extern HTChunk * HTChunkCreate PARAMS((int growby));
/*
Free a chunk
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
ON EXIT,
ch is invalid and may not be used.
*/
extern void HTChunkFree PARAMS((HTChunk * ch));
/*
Clear a chunk
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
ON EXIT,
*ch The size of the chunk is zero.
*/
extern void HTChunkClear PARAMS((HTChunk * ch));
/*
Ensure a chunk has a certain space in
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
s The size required
ON EXIT,
*ch Has size at least s
*/
extern void HTChunkEnsure PARAMS((HTChunk * ch, int s));
/*
Append a character to a chunk
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
c The character to be appended
ON EXIT,
*ch Is one character bigger
*/
extern void HTChunkPutc PARAMS((HTChunk * ch, char c));
/*
Append a string to a chunk
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
str Tpoints to a zero-terminated string to be appended
ON EXIT,
*ch Is bigger by strlen(str)
*/
extern void HTChunkPuts PARAMS((HTChunk * ch, char *str));
/*
Append a zero character to a chunk
*/
/*
ON ENTRY,
ch A valid chunk pointer made by HTChunkCreate()
ON EXIT,
*ch Is one character bigger
*/
extern void HTChunkTerminate PARAMS((HTChunk * ch));
/*
end */
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