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