libmisc/shell/main_getenv.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @brief Get an environment variable
0007  */
0008
0009 /*
0010  * COPYRIGHT (C) 2009 Chris Johns <chrisj@rtems.org>
0011  *
0012  * Redistribution and use in source and binary forms, with or without
0013  * modification, are permitted provided that the following conditions
0014  * are met:
0015  * 1. Redistributions of source code must retain the above copyright
0016  *    notice, this list of conditions and the following disclaimer.
0017  * 2. Redistributions in binary form must reproduce the above copyright
0018  *    notice, this list of conditions and the following disclaimer in the
0019  *    documentation and/or other materials provided with the distribution.
0020  *
0021  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0022  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0023  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0024  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0025  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0026  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0027  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0028  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0029  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0030  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0031  * POSSIBILITY OF SUCH DAMAGE.
0032  */
0033
0034 #ifdef HAVE_CONFIG_H
0035 #include "config.h"
0036 #endif
0037
0038 #include <stdio.h>
0039 #include <stdlib.h>
0040 #include <unistd.h>
0041 #include <string.h>
0042 #include <errno.h>
0043
0044 #include <rtems.h>
0045 #include <rtems/shell.h>
0046 #include "internal.h"
0047
0048 static int rtems_shell_main_getenv(int argc, char *argv[])
0049 {
0050   char* string;
0051
0052   if (argc != 2)
0053   {
0054     printf ("error: only argument is the variable name\n");
0055     return 1;
0056   }
0057
0058   string = getenv (argv[1]);
0059
0060   if (!string)
0061   {
0062     printf ("error: %s not found\n", argv[1]);
0063     return 1;
0064   }
0065
0066   printf ("%s\n", string);
0067
0068   return 0;
0069 }
0070
0071 rtems_shell_cmd_t rtems_shell_GETENV_Command = {
0072   "getenv",                      /* name */
0073   "getenv [var]",                /* usage */
0074   "misc",                        /* topic */
0075   rtems_shell_main_getenv,       /* command */
0076   NULL,                          /* alias */
0077   NULL                           /* next */
0078 };