Category : Printer + Display Graphics
Archive   : AVRIL11.ZIP
Filename : PACKET.C

/* Device packet support for PC version of AVRIL */

/* Written by Bernie Roehl, June 1994 */

/* Copyright 1994 by Bernie Roehl */

/* You may use this code for your own non-commercial projects without
paying any fees or royalties. "Non-commercial", in this context,
means that the software you write is given away for free to anyone
who wants it.

Commercial use, including shareware, requires a licensing
fee and a specific written agreement with the author.

All programs created using this software (both commercial and
non-commercial) must acknowledge the use of the AVRIL library,
both in the documentation and in a banner screen at the start or
end of the program.

For more information, contact Bernie Roehl ([email protected]).

*/

#include

#include "avril.h"

vrl_DevicePacketBuffer *vrl_DeviceCreatePacketBuffer(int buffsize)
{
vrl_DevicePacketBuffer *p;
p = malloc(sizeof(vrl_DevicePacketBuffer));
if (p == NULL) return NULL;
p->buffer = malloc(buffsize);
if (p->buffer == NULL)
{
free(p);
return NULL;
}
p->ind = 0; p->buffsize = buffsize;
return p;
}

void vrl_DeviceDestroyPacketBuffer(vrl_DevicePacketBuffer *buff)
{
if (buff->buffer) free(buff->buffer);
free(buff);
}

vrl_Boolean vrl_DeviceGetPacket(vrl_SerialPort *port, vrl_DevicePacketBuffer *buff)
{
while (vrl_SerialCheck(port))
{
int c = vrl_SerialGetc(port);
if (c & 0x80) /* framing bit set */
buff->ind = 0;
if (buff->ind < buff->buffsize)
buff->buffer[buff->ind++] = c;
if (buff->ind == buff->buffsize)
{
++buff->ind; /* make sure we only return it once */
return 1; /* complete packet received */
}
}
return 0; /* no data waiting, packet not yet complete */
}