Add bash 5.2 to third_party

third_party/bash/getenv.c

@@ -0,0 +1,233 @@
+/* getenv.c - get environment variable value from the shell's variable
+	      list. */
+
+/* Copyright (C) 1997-2002 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#if defined (CAN_REDEFINE_GETENV)
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include "bashansi.h"
+#include <errno.h>
+#include "shell.h"
+
+#ifndef errno
+extern int errno;
+#endif
+
+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)
+     const char *name;
+{
+  SHELL_VAR *var;
+
+  if (name == 0 || *name == '\0')
+    return ((char *)NULL);
+
+  var = find_tempenv_variable ((char *)name);
+  if (var)
+    {
+      FREE (last_tempenv_value);
+
+      last_tempenv_value = value_cell (var) ? savestring (value_cell (var)) : (char *)NULL;
+      return (last_tempenv_value);
+    }
+  else if (shell_variables)
+    {
+      var = find_variable ((char *)name);
+      if (var && exported_p (var))
+	return (value_cell (var));
+    }
+  else if (environ)
+    {
+      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)
+     const char *name;
+{
+  return (getenv (name));
+}
+
+/* SUSv3 says argument is a `char *'; BSD implementations disagree */
+int
+putenv (str)
+#ifndef HAVE_STD_PUTENV
+     const char *str;
+#else
+     char *str;
+#endif
+{
+  SHELL_VAR *var;
+  char *name, *value;
+  int offset;
+
+  if (str == 0 || *str == '\0')
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  offset = assignment (str, 0);
+  if (str[offset] != '=')
+    {
+      errno = EINVAL;
+      return -1;
+    }
+  name = savestring (str);
+  name[offset] = 0;
+
+  value = name + offset + 1;
+
+  /* XXX - should we worry about readonly here? */
+  var = bind_variable (name, value, 0);
+  if (var == 0)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  VUNSETATTR (var, att_invisible);
+  VSETATTR (var, att_exported);
+
+  return 0;
+}
+
+#if 0
+int
+_putenv (name)
+#ifndef HAVE_STD_PUTENV
+     const char *name;
+#else
+     char *name;
+#endif
+{
+  return putenv (name);
+}
+#endif
+
+int
+setenv (name, value, rewrite)
+     const char *name;
+     const char *value;
+     int rewrite;
+{
+  SHELL_VAR *var;
+  char *v;
+
+  if (name == 0 || *name == '\0' || strchr (name, '=') != 0)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  var = 0;
+  v = (char *)value;	/* some compilers need explicit cast */
+  /* XXX - should we worry about readonly here? */
+  if (rewrite == 0)
+    var = find_variable (name);
+
+  if (var == 0)
+    var = bind_variable (name, v, 0);
+
+  if (var == 0)
+    return -1;
+
+  VUNSETATTR (var, att_invisible);
+  VSETATTR (var, att_exported);
+
+  return 0;
+}
+
+#if 0
+int
+_setenv (name, value, rewrite)
+     const char *name;
+     const char *value;
+     int rewrite;
+{
+  return setenv (name, value, rewrite);
+}
+#endif
+
+/* SUSv3 says unsetenv returns int; existing implementations (BSD) disagree. */
+
+#ifdef HAVE_STD_UNSETENV
+#define UNSETENV_RETURN(N)	return(N)
+#define UNSETENV_RETTYPE	int
+#else
+#define UNSETENV_RETURN(N)	return
+#define UNSETENV_RETTYPE	void
+#endif
+
+UNSETENV_RETTYPE
+unsetenv (name)
+     const char *name;
+{
+  if (name == 0 || *name == '\0' || strchr (name, '=') != 0)
+    {
+      errno = EINVAL;
+      UNSETENV_RETURN(-1);
+    }
+
+  /* XXX - should we just remove the export attribute here? */
+#if 1
+  unbind_variable (name);
+#else
+  SHELL_VAR *v;
+
+  v = find_variable (name);
+  if (v)
+    VUNSETATTR (v, att_exported);
+#endif
+
+  UNSETENV_RETURN(0);
+}
+#endif /* CAN_REDEFINE_GETENV */