commands/printenv.c

   1 /*
   2  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /**
  22  * @file
  23  * @brief printenv: Print out environment variables
  24  */
  25
  26 #include <common.h>
  27 #include <command.h>
  28 #include <errno.h>
  29 #include <environment.h>
  30
  31 static int do_printenv (cmd_tbl_t *cmdtp, int argc, char *argv[])
  32 {
  33         struct variable_d *var;
  34         struct env_context *c, *current_c;
  35
  36         if (argc == 2) {
  37                 const char *val = getenv(argv[1]);
  38                 if (val) {
  39                         printf("%s=%s\n", argv[1], val);
  40                         return 0;
  41                 }
  42                 printf("## Error: \"%s\" not defined\n", argv[1]);
  43                 return 1;
  44         }
  45
  46         current_c = get_current_context();
  47         var = current_c->local->next;
  48         printf("locals:\n");
  49         while (var) {
  50                 printf("%s=%s\n", var_name(var), var_val(var));
  51                 var = var->next;
  52         }
  53
  54         printf("globals:\n");
  55         c = get_current_context();
  56         while(c) {
  57                 var = c->global->next;
  58                 while (var) {
  59                         printf("%s=%s\n", var_name(var), var_val(var));
  60                         var = var->next;
  61                 }
  62                 c = c->parent;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static const __maybe_unused char cmd_printenv_help[] =
  69 "\n    - print values of all environment variables\n"
  70 "printenv name ...\n"
  71 "    - print value of environment variable 'name'\n";
  72
  73
  74 U_BOOT_CMD_START(printenv)
  75         .cmd            = do_printenv,
  76         .usage          = "print environment variables",
  77         U_BOOT_CMD_HELP(cmd_printenv_help)
  78 U_BOOT_CMD_END
  79
  80 /**
  81  * @page printenv_command printenv
  82  *
  83  * Usage: printenv [\<name>]
  84  *
  85  * Print environment variables.
  86  * If \<name> was given, it prints out its content if the environment variable
  87  * \<name> exists.
  88  *
  89  * Without the \<name> argument all current environment variables are printed.
  90  */