tools/env/fw_env_main.c

   1 /*
   2  * (C) Copyright 2000-2008
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Command line user interface to firmware (=U-Boot) environment.
  26  *
  27  * Implements:
  28  *      fw_printenv [[ -n name ] | [ name ... ]]
  29  *              - prints the value of a single environment variable
  30  *                "name", the ``name=value'' pairs of one or more
  31  *                environment variables "name", or the whole
  32  *                environment if no names are specified.
  33  *      fw_setenv name [ value ... ]
  34  *              - If a name without any values is given, the variable
  35  *                with this name is deleted from the environment;
  36  *                otherwise, all "value" arguments are concatenated,
  37  *                separated by single blank characters, and the
  38  *                resulting string is assigned to the environment
  39  *                variable "name"
  40  */
  41
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include <stdlib.h>
  45 #include <getopt.h>
  46 #include "fw_env.h"
  47
  48 #define CMD_PRINTENV    "fw_printenv"
  49 #define CMD_SETENV      "fw_setenv"
  50
  51 static struct option long_options[] = {
  52         {"script", required_argument, NULL, 's'},
  53         {"help", no_argument, NULL, 'h'},
  54         {NULL, 0, NULL, 0}
  55 };
  56
  57 void usage(void)
  58 {
  59
  60         fprintf(stderr, "fw_printenv/fw_setenv, "
  61                 "a command line interface to U-Boot environment\n\n"
  62                 "usage:\tfw_printenv [-n] [variable name]\n"
  63                 "\tfw_setenv [variable name] [variable value]\n"
  64                 "\tfw_setenv -s [ file ]\n"
  65                 "\tfw_setenv -s - < [ file ]\n\n"
  66                 "The file passed as argument contains only pairs "
  67                 "name / value\n"
  68                 "Example:\n"
  69                 "# Any line starting with # is treated as comment\n"
  70                 "\n"
  71                 "\t      netdev         eth0\n"
  72                 "\t      kernel_addr    400000\n"
  73                 "\t      var1\n"
  74                 "\t      var2          The quick brown fox jumps over the "
  75                 "lazy dog\n"
  76                 "\n"
  77                 "A variable without value will be dropped. It is possible\n"
  78                 "to put any number of spaces between the fields, but any\n"
  79                 "space inside the value is treated as part of the value "
  80                 "itself.\n\n"
  81         );
  82 }
  83
  84 int
  85 main(int argc, char *argv[])
  86 {
  87         char *p;
  88         char *cmdname = *argv;
  89         char *script_file = NULL;
  90         int c;
  91
  92         if ((p = strrchr (cmdname, '/')) != NULL) {
  93                 cmdname = p + 1;
  94         }
  95
  96         while ((c = getopt_long (argc, argv, "ns:h",
  97                 long_options, NULL)) != EOF) {
  98                 switch (c) {
  99                 case 'n':
 100                         /* handled in fw_printenv */
 101                         break;
 102                 case 's':
 103                         script_file = optarg;
 104                         break;
 105                 case 'h':
 106                         usage();
 107                         return EXIT_SUCCESS;
 108                 default: /* '?' */
 109                         fprintf(stderr, "Try `%s --help' for more information."
 110                                 "\n", cmdname);
 111                         return EXIT_FAILURE;
 112                 }
 113         }
 114
 115
 116         if (strcmp(cmdname, CMD_PRINTENV) == 0) {
 117
 118                 if (fw_printenv (argc, argv) != 0)
 119                         return EXIT_FAILURE;
 120
 121                 return EXIT_SUCCESS;
 122
 123         } else if (strcmp(cmdname, CMD_SETENV) == 0) {
 124                 if (!script_file) {
 125                         if (fw_setenv(argc, argv) != 0)
 126                                 return EXIT_FAILURE;
 127                 } else {
 128                         if (fw_parse_script(script_file) != 0)
 129                                 return EXIT_FAILURE;
 130                 }
 131
 132                 return EXIT_SUCCESS;
 133
 134         }
 135
 136         fprintf (stderr,
 137                 "Identity crisis - may be called as `" CMD_PRINTENV
 138                 "' or as `" CMD_SETENV "' but not as `%s'\n",
 139                 cmdname);
 140         return EXIT_FAILURE;
 141 }