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/*
* SCCS: @(#)ldst.c 1.7 (96/11/04)
*
* UniSoft Ltd., London, England
*
* (C) Copyright 1992 X/Open Company Limited
*
* All rights reserved. No part of this source code may be reproduced,
* stored in a retrieval system, or transmitted, in any form or by any
* means, electronic, mechanical, photocopying, recording or otherwise,
* except as stated in the end-user licence agreement, without the prior
* permission of the copyright owners.
*
* X/Open and the 'X' symbol are trademarks of X/Open Company Limited in
* the UK and other countries.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/************************************************************************
SCCS: @(#)ldst.c 1.7 96/11/04 TETware release 3.3
NAME: ldst.c
PRODUCT: TETware
AUTHOR: Andrew Dingwall, UniSoft Ltd.
DATE CREATED: April 1992
DESCRIPTION:
low-level functions to convert data structures between internal and
machine-independent format
MODIFICATIONS:
************************************************************************/
#ifndef TET_LITE /* -START-LITE-CUT- */
#include <stdio.h>
#include "dtmac.h"
#include "ltoa.h"
#include "ldst.h"
#include "dtmsg.h"
#include "error.h"
#include "dtetlib.h"
/* static function declarations */
static int bs2char PROTOLIST((char *, char *, int));
static int bs2long PROTOLIST((char *, long *, int));
static int bs2short PROTOLIST((char *, short *, int));
static int bs2ushort PROTOLIST((char *, unsigned short *, int));
static int char2bs PROTOLIST((char *, char *, int));
static int long2bs PROTOLIST((long *, char *, int));
static int short2bs PROTOLIST((short *, char *, int));
/*
** tet_bs2st() - convert a structure from machine-independent to
** internal format
**
** return 0 if the expected number of bytes was received, -1 otherwise
** (this is mainly a defence against inconsistencies between the
** structures and their stdesc descriptions)
*/
int tet_bs2st(from, to, st, nst, len)
char *from, *to;
register struct stdesc *st;
register int nst, len;
{
register char *fp, *tp;
register int n, count;
for (count = 0; nst > 0 && count < len; nst--, st++) {
fp = from + st->st_bsoff;
tp = to + st->st_stoff;
n = st->st_type & ST_COUNTMASK;
switch (st->st_type & ST_TYPEMASK) {
case ST_CHARTYPE:
count += bs2char(fp, tp, n);
break;
case ST_SHORTTYPE:
count += bs2short(fp, (short *) tp, n);
break;
case ST_USHORTTYPE:
count += bs2ushort(fp, (unsigned short *) tp, n);
break;
case ST_LONGTYPE:
count += bs2long(fp, (long *) tp, n);
break;
default:
error(0, "unexpected type", tet_i2o(st->st_type));
break;
}
}
if (len != count) {
error(0, "internal error: tet_bs2st() wanted", tet_i2a(count));
error(0, "tet_bs2st() received", tet_i2a(len));
return(-1);
}
return(0);
}
/*
** tet_st2bs() - convert a structure to machine-independent format
**
** return the number of bytes occupied by the result
*/
int tet_st2bs(from, to, st, nst)
char *from, *to;
register struct stdesc *st;
register int nst;
{
register char *fp, *tp;
register int n, count;
for (count = 0; nst > 0; nst--, st++) {
fp = from + st->st_stoff;
tp = to + st->st_bsoff;
n = st->st_type & ST_COUNTMASK;
switch (st->st_type & ST_TYPEMASK) {
case ST_CHARTYPE:
count += char2bs(fp, tp, n);
break;
case ST_SHORTTYPE:
case ST_USHORTTYPE:
count += short2bs((short *) fp, tp, n);
break;
case ST_LONGTYPE:
count += long2bs((long *) fp, tp, n);
break;
default:
error(0, "unexpected type", tet_i2o(st->st_type));
break;
}
}
return(count);
}
/*
** bs2char(), bs2short(), bs2ushort, bs2long() - convert arrays of
** objects from machine-independent to internal format
**
** return the number of bytes of machine-independent data converted
*/
static int bs2char(from, to, n)
register char *from;
register char *to;
register int n;
{
register int count = n;
while (--n >= 0)
*to++ = *from++;
return(count);
}
static int bs2short(from, to, n)
register char *from;
register short *to;
register int n;
{
register int count = n * SHORTSIZE;
while (--n >= 0) {
*to++ = ld16(from);
from += SHORTSIZE;
}
return(count);
}
static int bs2ushort(from, to, n)
register char *from;
register unsigned short *to;
register int n;
{
register int count = n * SHORTSIZE;
while (--n >= 0) {
*to++ = ld16u(from);
from += SHORTSIZE;
}
return(count);
}
static int bs2long(from, to, n)
register char *from;
register long *to;
register int n;
{
register int count = n * LONGSIZE;
while (--n >= 0) {
*to++ = ld32(from);
from += LONGSIZE;
}
return(count);
}
/*
** char2bs(), short2bs(), long2bs() - convert arrays of
** objects from internal to machine-independent format
**
** return the number of bytes occupied by the machine-independent data
*/
static int char2bs(from, to, n)
register char *from, *to;
register int n;
{
register int count = n;
while (--n >= 0)
*to++ = *from++;
return(count);
}
static int short2bs(from, to, n)
register short *from;
register char *to;
register int n;
{
register int count = n * SHORTSIZE;
while (--n >= 0) {
st16(*from, to);
from++;
to += SHORTSIZE;
}
return(count);
}
static int long2bs(from, to, n)
register long *from;
register char *to;
register int n;
{
register int count = n * LONGSIZE;
while (--n >= 0) {
st32(*from, to);
from++;
to += LONGSIZE;
}
return(count);
}
#else /* -END-LITE-CUT- */
int tet_ldst_c_not_empty;
#endif /* !TET_LITE */ /* -LITE-CUT-LINE- */
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