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/* Gap buffers */
struct buffer;
struct buffer *buffer_create(char *path);
void buffer_destroy(struct buffer *);
unsigned buffer_raw(struct buffer *, char **,
unsigned offset, unsigned bytes);
unsigned buffer_get(struct buffer *, void *,
unsigned offset, unsigned bytes);
unsigned buffer_delete(struct buffer *,
unsigned offset, unsigned bytes);
unsigned buffer_insert(struct buffer *, const void *,
unsigned offset, unsigned bytes);
unsigned buffer_move(struct buffer *dest, unsigned,
struct buffer *src, unsigned, unsigned bytes);
void buffer_snap(struct buffer *);
/* do *not* use directly; this definition is here
* just for the inline functions.
*/
struct buffer {
char *data;
unsigned allocated, payload, gap;
int fd;
char *path;
};
INLINE unsigned buffer_bytes(struct buffer *buffer)
{
return buffer ? buffer->payload : 0;
}
INLINE unsigned buffer_gap_bytes(struct buffer *buffer)
{
return buffer->allocated - buffer->payload;
}
INLINE int buffer_byte(struct buffer *buffer, unsigned offset)
{
if (!buffer || offset >= buffer->payload)
return -1;
if (offset >= buffer->gap)
offset += buffer_gap_bytes(buffer);
return offset[(unsigned char *) buffer->data];
}
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