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authorIgor Pashev <pashev.igor@gmail.com>2012-12-31 05:04:42 +0400
committerIgor Pashev <pashev.igor@gmail.com>2012-12-31 05:04:42 +0400
commit71dc8760ff4de5f365330d1bc571d934deb54af9 (patch)
tree7346d42a282562a3937d82307012b5857d642ce6 /librols/getav0.c
downloadcdrkit-71dc8760ff4de5f365330d1bc571d934deb54af9.tar.gz
Imported Upstream version 1.1.11upstream/1.1.11upstream
Diffstat (limited to 'librols/getav0.c')
-rw-r--r--librols/getav0.c155
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 */