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/* @(#)getav0.c 1.10 00/05/07 Copyright 1985 J. Schilling */
#ifndef lint
static char sccsid[] =
"@(#)getav0.c 1.10 00/05/07 Copyright 1985 J. Schilling";
#endif
/*
* Get arg vector by scanning the stack
*
* Copyright (c) 1985 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* 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, 675 Mass Ave, Cambridge, MA 02139, 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 NO_SCANSTACK
# 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
char **getavp()
{
register struct frame *fp;
register struct frame *ofp;
char **av;
#if FP_INDIR > 0
register int i = 0;
#endif
ofp = fp = (struct frame *)getfp();
while (fp) {
#if FP_INDIR > 0
i++;
#endif
ofp = fp;
if (!is_even(fp->fr_savfp)) {
fp = (struct frame *)even(fp->fr_savfp);
fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
continue;
}
fp = fp->fr_savfp;
}
#if FP_INDIR > 0
i -= FP_INDIR;
ofp = fp = (struct frame *)getfp();
while (fp) {
if (--i < 0)
break;
ofp = fp;
if (!is_even(fp->fr_savfp)) {
fp = (struct frame *)even(fp->fr_savfp);
fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
continue;
}
fp = fp->fr_savfp;
}
#endif
av = (char **)ofp + AV_OFFSET; /* aus avoffset.h */
/* (wird generiert mit av_offset) */
return (av);
}
char *getav0()
{
return (getavp()[0]);
}
#else
char *getav0()
{
return ("???");
}
#endif /* HAVE_SCANSTACK */
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