Imported from ../bash-2.02.tar.gz.

lib/sh/getenv.c

@@ -0,0 +1,99 @@
+/* getenv.c - get environment variable value from the shell's variable
+	      list. */
+
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 2, or (at your option) any later
+   version.
+
+   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA */
+
+#include <config.h>
+
+#if defined (CAN_REDEFINE_GETENV)
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <bashansi.h>
+#include <shell.h>
+
+extern char **environ;
+
+/* We supply our own version of getenv () because we want library
+   routines to get the changed values of exported variables. */
+
+/* The NeXT C library has getenv () defined and used in the same file.
+   This screws our scheme.  However, Bash will run on the NeXT using
+   the C library getenv (), since right now the only environment variable
+   that we care about is HOME, and that is already defined.  */
+static char *last_tempenv_value = (char *)NULL;
+
+char *
+getenv (name)
+#if defined (__linux__) || defined (__bsdi__) || defined (convex)
+     const char *name;
+#else
+     char const *name;
+#endif /* !__linux__ && !__bsdi__ && !convex */
+{
+  SHELL_VAR *var;
+
+  var = find_tempenv_variable ((char *)name);
+  if (var)
+    {
+      FREE (last_tempenv_value);
+
+      last_tempenv_value = savestring (value_cell (var));
+      dispose_variable (var);
+      return (last_tempenv_value);
+    }
+  else if (shell_variables)
+    {
+      var = find_variable ((char *)name);
+      if (var && exported_p (var))
+	return (value_cell (var));
+    }
+  else
+    {
+      register int i, len;
+
+      /* In some cases, s5r3 invokes getenv() before main(); BSD systems
+	 using gprof also exhibit this behavior.  This means that
+	 shell_variables will be 0 when this is invoked.  We look up the
+	 variable in the real environment in that case. */
+
+      for (i = 0, len = strlen (name); environ[i]; i++)
+	{
+	  if ((STREQN (environ[i], name, len)) && (environ[i][len] == '='))
+	    return (environ[i] + len + 1);
+	}
+    }
+
+  return ((char *)NULL);
+}
+
+/* Some versions of Unix use _getenv instead. */
+char *
+_getenv (name)
+#if defined (__linux__) || defined (__bsdi__) || defined (convex)
+     const char *name;
+#else
+     char const *name;
+#endif /* !__linux__ && !__bsdi__ && !convex */
+{
+  return (getenv (name));
+}
+#endif /* CAN_REDEFINE_GETENV */