2 * This file has been modified for the cdrkit suite.
4 * The behaviour and appearence of the program code below can differ to a major
5 * extent from the version distributed by the original author(s).
7 * For details, see Changelog file distributed with the cdrkit package. If you
8 * received this file from another source then ask the distributing person for
9 * a log of modifications.
13 /* @(#)getav0.c 1.16 04/05/09 Copyright 1985, 1995-2004 J. Schilling */
15 * Get arg vector by scanning the stack
17 * Copyright (c) 1985, 1995-2004 J. Schilling
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License version 2
22 * as published by the Free Software Foundation.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License along with
30 * this program; see the file COPYING. If not, write to the Free Software
31 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
40 #if !defined(AV_OFFSET) || !defined(FP_INDIR)
41 # ifdef HAVE_SCANSTACK
42 # undef HAVE_SCANSTACK
50 #define is_even(p) ((((long)(p)) & 1) == 0)
51 #define even(p) (((long)(p)) & ~1L)
53 #define even(p) (((long)(p)) - 1) /* will this work with 64 bit ?? */
56 EXPORT char **getmainfp __PR((void));
57 EXPORT char **getavp __PR((void));
58 EXPORT char *getav0 __PR((void));
64 register struct frame *fp;
71 * As the SCO OpenServer C-Compiler has a bug that may cause
72 * the first function call to getfp() been done before the
73 * new stack frame is created, we call getfp() twice.
76 fp = (struct frame *)getfp();
80 while (fp->fr_savfp) {
81 if (fp->fr_savpc == NULL)
84 if (!is_even(fp->fr_savfp)) {
85 fp = (struct frame *)even(fp->fr_savfp);
88 fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
91 fp = (struct frame *)fp->fr_savfp;
100 fp = (struct frame *)getfp();
104 while (fp->fr_savfp) {
105 if (fp->fr_savpc == NULL)
108 if (!is_even(fp->fr_savfp)) {
109 fp = (struct frame *)even(fp->fr_savfp);
112 fp = (struct frame *)((SIGBLK *)fp)->sb_savfp;
115 fp = (struct frame *)fp->fr_savfp;
129 register struct frame *fp;
132 fp = (struct frame *)getmainfp();
136 av = (char **)(((char *)fp) + AV_OFFSET); /* aus avoffset.h */
144 return (getavp()[0]);
155 #endif /* HAVE_SCANSTACK */