Update.

* sysdeps/gnu/Makefile (libdl-routines): Add eval.

1999-07-06  Zack Weinberg  <zack@rabi.columbia.edu>

	* dlfcn: New directory.  Move the following files from elf:
	dladdr.c, dlclose.c, dlerror.c, dlfcn.h, dlopen.c,
	dlopenold.c, dlsym.c, dlvsym.c.
	* dlfcn/Makefile: New file.
	* dlfcn/Versions: New file.
	* dlfcn/dlsym.c: All ELF-specific code split out to new
	function _dl_sym.
	* dlfcn/dlvsym.c: All ELF-specific code split out to new
	function _dl_vsym.
	* elf/dl-sym.c: New file.  _dl_sym and _dl_vsym are
	implemented here.

	* dlfcn/dladdr.c: Remove all references to ELF data structures
	or headers.
	* dlfcn/dlclose.c: Likewise.
	* dlfcn/dlerror.c: Likewise.
	* dlfcn/dlopen.c: Likewise.
	* dlfcn/dlopenold.c: Likewise.

	* Makeconfig (dlfcn): New variable - set to `dlfcn' if elf is
	yes, empty otherwise.
	(libdl): Set to dlfcn/libdl.so or libdl.a if elf is yes,
	depending on build-shared.
	(subdirs): Add $(dlfcn).
	(rpath-dirs): Add dlfcn.
	* elf/Makefile: Remove all references to libdl or its
	components, except the ones relating to the test cases.
	(routines): Add dl-sym.
	* elf/Versions (libc): Add _dl_sym and _dl_vsym for GLIBC_2.2.
	(libdl): Delete.

	* elf/dl-close.c (_dl_close): Change argument to void *.
	* elf/dl-open.c (_dl_open): Change return type to void *.
	* elf/eval.c: Removed.
	* elf/ldsodefs.h: Move prototypes of _dl_catch_error,
	_dlerror_run, _dl_open, _dl_close, _dl_addr, and
	_dl_mcount_wrapper_check to include/dlfcn.h.  Delete
	_CALL_DL_FCT macro.
	* include/dlfcn.h: Also prototype _dl_sym and _dl_vsym here.
	Include real header from dlfcn directory.
	* include/ldsodefs.h: Removed.

	* grp/initgroups.c: Use DL_CALL_FCT not _CALL_DL_FCT.
	* nss/getXXbyYY_r.c: Likewise.
	* nss/getXXent_r.c: Likewise.
	* iconv/gconv.c: Likewise.  Don't include ldsodefs.h.
	* iconv/gconv_db.c: Likewise.  Don't include ldsodefs.h.
	* iconv/skeleton.c: Don't include ldsodefs.h.
	* nss/nsswitch.h: Don't include ldsodefs.h.  Include dlfcn.h.

1999-07-07  Ulrich Drepper  <drepper@cygnus.com>

sysdeps/gnu/eval.c

@@ -0,0 +1,138 @@
+/* You don't really want to know what this hack is for.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <dlfcn.h>
+
+static void *funcall (char **stringp);
+static void *eval (char **stringp);
+
+static void *
+funcall (char **stringp)
+{
+  void *args[strlen (*stringp)], **ap = args;
+  void *argcookie = &args[1];
+
+  do
+    {
+      /* Evaluate the next token.  */
+      *ap++ = eval (stringp);
+
+      /* Whitespace is irrelevant.  */
+      while (isspace (**stringp))
+	++*stringp;
+
+      /* Terminate at closing paren or end of line.  */
+    } while (**stringp != '\0' && **stringp != ')');
+  if (**stringp != '\0')
+    /* Swallow closing paren.  */
+    ++*stringp;
+
+  if (args[0] == NULL)
+    {
+      static const char unknown[] = "Unknown function\n";
+      write (1, unknown, sizeof unknown - 1);
+      return NULL;
+    }
+
+  /* Do it to it.  */
+  __builtin_return (__builtin_apply (args[0],
+				     &argcookie,
+				     (char *) ap - (char *) &args[1]));
+}
+
+static void *
+eval (char **stringp)
+{
+  void *value;
+  char *p = *stringp, c;
+
+  /* Whitespace is irrelevant.  */
+  while (isspace (*p))
+    ++p;
+
+  switch (*p)
+    {
+    case '"':
+      /* String constant.  */
+      value = ++p;
+      do
+	if (*p == '\\')
+	  {
+	    switch (*strcpy (p, p + 1))
+	      {
+	      case 't':
+		*p = '\t';
+		break;
+	      case 'n':
+		*p = '\n';
+		break;
+	      }
+	    ++p;
+	  }
+      while (*p != '\0' && *p++ != '"');
+      if (p[-1] == '"')
+	p[-1] = '\0';
+      break;
+
+    case '(':
+      *stringp = ++p;
+      return funcall (stringp);
+
+    default:
+      /* Try to parse it as a number.  */
+      value = (void *) strtol (p, stringp, 0);
+      if (*stringp != p)
+	return value;
+
+      /* Anything else is a symbol that produces its address.  */
+      value = p;
+      do
+	++p;
+      while (*p != '\0' && !isspace (*p) && (!ispunct (*p) || *p == '_'));
+      c = *p;
+      *p = '\0';
+      value = dlsym (NULL, value);
+      *p = c;
+      break;
+    }
+
+  *stringp = p;
+  return value;
+}
+
+
+void
+_start (void)
+{
+  char *buf = NULL;
+  size_t bufsz = 0;
+
+  while (__getdelim (&buf, &bufsz, '\n', stdin) > 0)
+    {
+      char *p = buf;
+      eval (&p);
+    }
+
+  exit (0);
+}