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xbuf.c
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xbuf.c
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#include "less.h"
#include "xbuf.h"
/*
* Initialize an expandable text buffer.
*/
public void xbuf_init(struct xbuffer *xbuf)
{
xbuf->data = NULL;
xbuf->size = xbuf->end = 0;
}
public void xbuf_deinit(struct xbuffer *xbuf)
{
if (xbuf->data != NULL)
free(xbuf->data);
xbuf_init(xbuf);
}
public void xbuf_reset(struct xbuffer *xbuf)
{
xbuf->end = 0;
}
/*
* Add a byte to an expandable text buffer.
*/
public void xbuf_add_byte(struct xbuffer *xbuf, unsigned int b)
{
if (xbuf->end >= xbuf->size)
{
unsigned char *data;
xbuf->size = (xbuf->size == 0) ? 16 : xbuf->size * 2;
data = (unsigned char *) ecalloc(xbuf->size, sizeof(unsigned char));
if (xbuf->data != NULL)
{
memcpy(data, xbuf->data, xbuf->end);
free(xbuf->data);
}
xbuf->data = data;
}
xbuf->data[xbuf->end++] = (unsigned char) b;
}
public void xbuf_add_data(struct xbuffer *xbuf, unsigned char *data, int len)
{
int i;
for (i = 0; i < len; i++)
xbuf_add_byte(xbuf, data[i]);
}
public int xbuf_pop(struct xbuffer *buf)
{
if (buf->end == 0)
return -1;
return (int) buf->data[--(buf->end)];
}
public void xbuf_set(struct xbuffer *dst, struct xbuffer *src)
{
xbuf_reset(dst);
xbuf_add_data(dst, src->data, src->end);
}
public char * xbuf_char_data(struct xbuffer *xbuf)
{
return (char *)(xbuf->data);
}