Imported Upstream version 1.1.11upstream/1.1.11upstream

1 files changed, 155 insertions, 0 deletions

diff --git a/librols/getav0.c b/librols/getav0.c
new file mode 100644
index 0000000..3b7e2f4
--- /dev/null
+++ b/librols/getav0.c
@@ -0,0 +1,155 @@
+/*
+ * 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 */