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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZReadZcode function.
*
* Created by: Jeffrey Hutzelman
*
* $Id: ZReadZcode.c 2135 2008-01-21 03:39:30Z kcr $
*
* Copyright (c) 1987, 1990, 2002 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#ifndef lint
static const char rcsid_ZReadZcode_c[] = "$Id: ZReadZcode.c 2135 2008-01-21 03:39:30Z kcr $";
#endif /* lint */
#include <internal.h>
#include <assert.h>
Code_t
ZReadZcode(unsigned char *ptr,
unsigned char *field,
int max,
int *len)
{
int n = 0;
if (*ptr++ != 'Z')
return ZERR_BADFIELD;
while (*ptr && n < max) {
if (*ptr == 0xff) {
ptr++;
switch (*ptr++) {
case 0xf0: field[n++] = 0x00; continue;
case 0xf1: field[n++] = 0xff; continue;
default: return ZERR_BADFIELD;
}
} else {
field[n++] = *ptr++;
}
}
if (*ptr)
return (ZERR_BADFIELD);
*len = n;
return (ZERR_NONE);
}
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