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/*
* SCCS: @(#)xdfio.c 1.6 (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.
*/
#ifndef lint
static char sccsid[] = "@(#)xdfio.c 1.6 (96/11/04) TET3 release 3.3";
#endif
/************************************************************************
SCCS: @(#)xdfio.c 1.6 96/11/04 TETware release 3.3
NAME: xdfio.c
PRODUCT: TETware
AUTHOR: Andrew Dingwall, UniSoft Ltd.
DATE CREATED: May 1992
DESCRIPTION:
functions to request XRESD to open, close and read ascii files
MODIFICATIONS:
************************************************************************/
#include <stdio.h>
#include <errno.h>
#include "dtmac.h"
#include "dtmsg.h"
#include "avmsg.h"
#include "valmsg.h"
#include "error.h"
#include "servlib.h"
#include "dtetlib.h"
#ifdef NEEDsrcFile
static char srcFile[] = __FILE__; /* file name for error reporting */
#endif
/* static function declarations */
static char *xd_fio PROTOLIST((int));
/*
** tet_xdfopen() - send an OP_FOPEN message to XRESD and receive a reply
**
** return file ID if successful or -1 on error
*/
int tet_xdfopen(file)
char *file;
{
register char *dp;
/* make sure that file is non-null */
if (!file || !*file) {
tet_xderrno = ER_INVAL;
return(-1);
}
/* get the XRESD message buffer */
if ((dp = tet_xdmsgbuf(avmsgsz(OP_FOPEN_ARGC))) == (char *) 0) {
tet_xderrno = ER_ERR;
return(-1);
}
#define mp ((struct avmsg *) dp)
/* set up the request message */
mp->av_argc = OP_FOPEN_ARGC;
AV_FNAME(mp) = file;
AV_FTYPE(mp) = "r";
#undef mp
dp = xd_fio(OP_FOPEN);
#define rp ((struct valmsg *) dp)
return(dp ? (int) VM_FID(rp) : -1);
#undef rp
}
/*
** tet_xdfclose() - send an OP_FCLOSE message to XRESD and receive a reply
**
** return file ID if successful or -1 on error
*/
int tet_xdfclose(fid)
int fid;
{
register struct valmsg *mp;
/* get the XRESD message buffer */
if ((mp = (struct valmsg *) tet_xdmsgbuf(valmsgsz(OP_FCLOSE_NVALUE))) == (struct valmsg *) 0) {
tet_xderrno = ER_ERR;
return(-1);
}
/* set up the request message */
mp->vm_nvalue = OP_FCLOSE_NVALUE;
VM_FID(mp) = (long) fid;
return(xd_fio(OP_FCLOSE) == (char *) 0 ? -1 : 0);
}
/*
** tet_xdgets() - read a single line from a file opened by tet_xdfopen()
** and return a pointer thereto
**
** return (char *) 0 on EOF or error
*/
char *tet_xdgets(fid)
int fid;
{
register char **rp;
int nline = 1;
if ((rp = tet_xdgetsv(fid, &nline, (int *) 0)) == (char **) 0 ||
nline != 1)
return((char *) 0);
return(*rp);
}
/*
** tet_xdgetsv() - read one or more lines from a file opened by
** tet_xdfopen()
**
** up to *nlines lines will be read from the file
**
** return a pointer to the first in a list of string pointers
** if successful, or (char **) 0 on error
**
** if at least one line could be read, the number of lines actually read
** is returned indirectly through *nlines, and *eof is set to 1 or 0
** depending on whether or not the file is at EOF
**
** the lines and their pointers are held in memory owned by the
** tet_xdtalk() subsystem, so they must be copied if required before
** another XRESD request is issued
*/
char **tet_xdgetsv(fid, nlines, eof)
int fid, *eof;
register int *nlines;
{
register char *dp;
/* make sure that nlines is non-zero and that *nlines is +ve */
if (!nlines || *nlines <= 0) {
tet_xderrno = ER_INVAL;
return((char **) 0);
}
/* get the XRESD message buffer */
if ((dp = tet_xdmsgbuf(valmsgsz(OP_GETS_NVALUE))) == (char *) 0) {
tet_xderrno = ER_ERR;
return((char **) 0);
}
#define mp ((struct valmsg *) dp)
/* set up the request message */
mp->vm_nvalue = OP_GETS_NVALUE;
VM_FID(mp) = (long) fid;
VM_NLINES(mp) = (long) *nlines;
#undef mp
if ((dp = xd_fio(OP_GETS)) == (char *) 0)
return((char **) 0);
#define rp ((struct avmsg *) dp)
/* all ok so return all the return values */
*nlines = (int) OP_GETS_NLINE(rp);
if (eof)
*eof = (AV_FLAG(rp) == AV_DONE || *nlines <= 0) ? 1 : 0;
return(&AV_FLINE(rp, 0));
#undef rp
}
/*
** xd_fio() - common tet_xdtalk() interface used by several functions
**
** return pointer to XRESD reply buffer if successful
** or (char *) 0 on error
*/
static char *xd_fio(request)
int request;
{
register char *dp;
extern char tet_xderrmsg[];
/* send the request and receive the reply */
dp = tet_xdtalk(request, TALK_DELAY);
/* handle the return codes */
switch (tet_xderrno) {
case ER_OK:
return(dp);
case ER_FID:
case ER_INVAL:
break;
case ER_ERR:
if (!dp)
break;
/* else fall through */
default:
error(tet_unmaperrno(tet_xderrno), tet_xderrmsg,
tet_ptrepcode(tet_xderrno));
break;
}
/* here for server error return */
return((char *) 0);
}
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