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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZMakeZcode function.
*
* Created by: Jeffrey Hutzelman
*
* $Id: 63397a51cc3b6d1914d6a7985b59c31e94b8de01 $
*
* Copyright (c) 1987, 2002 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#include <internal.h>
#include <assert.h>
#ifndef lint
static const char rcsid_ZMakeZcode_c[] = "$Id: 63397a51cc3b6d1914d6a7985b59c31e94b8de01 $";
#endif
Code_t
ZMakeZcode32(char *ptr,
int len,
unsigned long val)
{
unsigned char buf[4];
buf[0] = (val >> 24) & 0xff;
buf[1] = (val >> 16) & 0xff;
buf[2] = (val >> 8) & 0xff;
buf[3] = val & 0xff;
return ZMakeZcode(ptr, len, buf, 4);
}
Code_t
ZMakeZcode(register char *ptr,
int len,
unsigned char *field,
int num)
{
int i;
/*
* This optimistic check lets us discover quickly if the buffer
* is not even large enough to hold the field without escapes.
* It also insures we'll have space for the leading 'Z' and the
* trailing NUL. Note that this does _not_ remove the need for
* checking length as we encode.
*/
if (len < num + 2)
return ZERR_FIELDLEN;
*ptr++ = 'Z';
--len;
for (i=0;i<num;i++) {
switch (field[i]) {
case 0x00:
if (len < 3)
return ZERR_FIELDLEN;
*(unsigned char *)ptr++ = 0xff;
*(unsigned char *)ptr++ = 0xf0;
len -= 2;
continue;
case 0xff:
if (len < 3)
return ZERR_FIELDLEN;
*(unsigned char *)ptr++ = 0xff;
*(unsigned char *)ptr++ = 0xf1;
len -= 2;
continue;
default:
if (len < 2)
return ZERR_FIELDLEN;
*ptr++ = field[i];
len--;
}
}
*ptr = '\0';
return ZERR_NONE;
}
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