From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 unix/os/zlocpr.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 unix/os/zlocpr.c

(limited to 'unix/os/zlocpr.c')

diff --git a/unix/os/zlocpr.c b/unix/os/zlocpr.c
new file mode 100644
index 00000000..fdaa1a33
--- /dev/null
+++ b/unix/os/zlocpr.c
@@ -0,0 +1,61 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+ */
+
+#include <stdio.h>
+#define	import_kernel
+#define	import_knames
+#define import_spp
+#include <iraf.h>
+
+#ifdef SOLARIS
+#define SUNOS
+#endif
+
+extern	unsigned VSHLIB[], VSHEND;	/* shared library descriptor */
+
+/* ZLOCPR -- Return the entry point address of a procedure as a magic
+ * integer value.  A subsequent call to one of the ZCALL primitives is used
+ * to call the procedure.
+ */
+int
+ZLOCPR (
+  PFI	proc,			/* procedure for which we desire address */
+  XINT	*o_epa			/* entry point address */
+)
+{
+	register unsigned *epa = (unsigned *) proc;
+	*o_epa = (XINT) epa;
+
+#ifdef SUNOS
+	/* Return immediately if the shared library is not in use. */
+	if (VSHLIB[0] == 0)
+	    return (XOK);
+
+	/* If the shared library is in use and the reference procedure is
+	 * a transfer vector, return the address of the actual function.
+	 * This is necessary to permit equality comparisons when ZLOCPR
+	 * is called to reference the same procedure in both the shared
+	 * library image and the client process.
+	 */
+	if (epa < VSHLIB || epa >= (unsigned *)&VSHEND)
+	    return (XOK);
+
+	/* Disassemble the JMP instruction in the transfer vector to get the
+	 * address of the referenced procedure in the shared library. [MACHDEP]
+	 */
+#ifdef i386
+	*o_epa = (XINT)((unsigned)epa + *((unsigned *)((char *)epa + 1)) + 5);
+#else
+#ifdef mc68000
+	*o_epa = (XINT)(*((unsigned *)((char *)epa + 2)));
+#else
+#ifdef sparc
+	*o_epa = (XINT)(((*epa & 0x3fffff) << 10) | (*(epa+1) & 0x3ff));
+#endif
+#endif
+#endif
+
+#endif
+
+	return (XOK);
+}
-- 
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