Imported Upstream version 93u+upstream

1 files changed, 116 insertions, 0 deletions

diff --git a/src/lib/libast/misc/fs3d.c b/src/lib/libast/misc/fs3d.c
new file mode 100644
index 0000000..cc708f2
--- /dev/null
+++ b/src/lib/libast/misc/fs3d.c
@@ -0,0 +1,116 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * Glenn Fowler
+ * AT&T Bell Laboratories
+ *
+ * 3d fs operations
+ * only active for non-shared 3d library
+ */
+
+#define mount	______mount
+
+#include <ast.h>
+
+#undef	mount
+
+#include <fs3d.h>
+
+int
+fs3d(register int op)
+{
+	register int	cur;
+	register char*	v;
+	char		val[sizeof(FS3D_off) + 8];
+
+	static int	fsview;
+	static char	on[] = FS3D_on;
+	static char	off[] = FS3D_off;
+
+	if (fsview < 0)
+		return 0;
+
+	/*
+	 * get the current setting
+	 */
+
+	if (!fsview && (!getenv("LD_PRELOAD") || mount("", "", 0, NiL)))
+		goto nope;
+	if (FS3D_op(op) == FS3D_OP_INIT && mount(FS3D_init, NiL, FS3D_VIEW, NiL))
+		goto nope;
+	if (mount(on, val, FS3D_VIEW|FS3D_GET|FS3D_SIZE(sizeof(val)), NiL))
+		goto nope;
+	if (v = strchr(val, ' '))
+		v++;
+	else
+		v = val;
+	if (!strcmp(v, on))
+		cur = FS3D_ON;
+	else if (!strncmp(v, off, sizeof(off) - 1) && v[sizeof(off)] == '=')
+		cur = FS3D_LIMIT((int)strtol(v + sizeof(off) + 1, NiL, 0));
+	else
+		cur = FS3D_OFF;
+	if (cur != op)
+	{
+		switch (FS3D_op(op))
+		{
+		case FS3D_OP_OFF:
+			v = off;
+			break;
+		case FS3D_OP_ON:
+			v = on;
+			break;
+		case FS3D_OP_LIMIT:
+			sfsprintf(val, sizeof(val), "%s=%d", off, FS3D_arg(op));
+			v = val;
+			break;
+		default:
+			v = 0;
+			break;
+		}
+		if (v && mount(v, NiL, FS3D_VIEW, NiL))
+			goto nope;
+	}
+	fsview = 1;
+	return cur;
+ nope:
+	fsview = -1;
+	return 0;
+}
+
+/*
+ * user code that includes <fs3d.h> will have mount() mapped to fs3d_mount()
+ * this restricts the various "standard" mount prototype conflicts to this spot
+ * this means that code that includes <fs3d.h> cannot access the real mount
+ * (at least without some additional macro hackery
+ */
+
+#undef	mount
+
+extern int	mount(const char*, char*, int, void*);
+
+int
+fs3d_mount(const char* source, char* target, int flags, void* data)
+{
+	return mount(source, target, flags, data);
+}