/*
* Buffer handling functions
*
* Copyright (C) 2003, Olaf Kirch <okir@suse.de>
*/
#include <config.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <openct/buffer.h>
void
ct_buf_init(ct_buf_t *bp, void *mem, size_t len)
{
memset(bp, 0, sizeof(*bp));
bp->base = (unsigned char *) mem;
bp->size = len;
}
void
ct_buf_set(ct_buf_t *bp, void *mem, size_t len)
{
ct_buf_init(bp, mem, len);
bp->tail = len;
}
int
ct_buf_get(ct_buf_t *bp, void *mem, size_t len)
{
if (len > bp->tail - bp->head)
return -1;
if (mem)
memcpy(mem, bp->base + bp->head, len);
bp->head += len;
return len;
}
int
ct_buf_put(ct_buf_t *bp, const void *mem, size_t len)
{
if (len > bp->size - bp->tail) {
bp->overrun = 1;
return -1;
}
if (mem)
memcpy(bp->base + bp->tail, mem, len);
bp->tail += len;
return len;
}
int
ct_buf_putc(ct_buf_t *bp, int byte)
{
unsigned char c = byte;
return ct_buf_put(bp, &c, 1);
}
unsigned int
ct_buf_avail(ct_buf_t *bp)
{
return bp->tail - bp->head;
}
void *
ct_buf_head(ct_buf_t *bp)
{
return bp->base + bp->head;
}