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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)getav0.c 1.16 04/05/09 Copyright 1985, 1995-2004 J. Schilling */
/*
* Get arg vector by scanning the stack
*
* Copyright (c) 1985, 1995-2004 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <mconfig.h>
#include <sigblk.h>
#include <avoffset.h>
#include <standard.h>
#include <schily.h>
#if !defined(AV_OFFSET) || !defined(FP_INDIR)
# ifdef HAVE_SCANSTACK
# undef HAVE_SCANSTACK
# endif
#endif
#ifdef HAVE_SCANSTACK
#include <stkframe.h>
#define is_even(p) ((((long)(p)) & 1) == 0)
#define even(p) (((long)(p)) & ~1L)
#ifdef __future__
#define even(p) (((long)(p)) - 1) /* will this work with 64 bit ?? */
#endif
EXPORT char **getmainfp __PR((void));
EXPORT char **getavp __PR((void));
EXPORT char *getav0 __PR((void));
EXPORT char **
getmainfp()
{
register struct frame *fp;
char **av;
#if FP_INDIR > 0
register int i = 0;
#endif
/*
* As the SCO OpenServer C-Compiler has a bug that may cause
* the first function call to getfp() been done before the
* new stack frame is created, we call getfp() twice.
*/
(void) getfp();
fp = (struct frame *)getfp();
if (fp == NULL)
return (NULL);
while (fp->fr_savfp) {
if (fp->fr_savpc == NULL)
break;
if (!is_even(fp->fr_savfp)) {
fp = (struct frame *)even(fp->fr_savfp);
if (fp == NULL)
break;
fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
continue;
}
fp = (struct frame *)fp->fr_savfp;
#if FP_INDIR > 0
i++;
#endif
}
#if FP_INDIR > 0
i -= FP_INDIR;
fp = (struct frame *)getfp();
if (fp == NULL)
return (NULL);
while (fp->fr_savfp) {
if (fp->fr_savpc == NULL)
break;
if (!is_even(fp->fr_savfp)) {
fp = (struct frame *)even(fp->fr_savfp);
if (fp == NULL)
break;
fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
continue;
}
fp = (struct frame *)fp->fr_savfp;
if (--i <= 0)
break;
}
#endif
av = (char **)fp;
return (av);
}
EXPORT char **
getavp()
{
register struct frame *fp;
char **av;
fp = (struct frame *)getmainfp();
if (fp == NULL)
return (NULL);
av = (char **)(((char *)fp) + AV_OFFSET); /* aus avoffset.h */
/* -> avoffset.c */
return (av);
}
EXPORT char *
getav0()
{
return (getavp()[0]);
}
#else
EXPORT char *
getav0()
{
return ("???");
}
#endif /* HAVE_SCANSTACK */
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