mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-25 14:10:43 +00:00
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* (C) Copyright 2000-2008
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Command line user interface to firmware (=U-Boot) environment.
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*
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* Implements:
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* fw_printenv [[ -n name ] | [ name ... ]]
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* - prints the value of a single environment variable
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* "name", the ``name=value'' pairs of one or more
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* environment variables "name", or the whole
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* environment if no names are specified.
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* fw_setenv name [ value ... ]
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* - If a name without any values is given, the variable
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* with this name is deleted from the environment;
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* otherwise, all "value" arguments are concatenated,
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* separated by single blank characters, and the
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* resulting string is assigned to the environment
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* variable "name"
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*/
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/file.h>
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#include <unistd.h>
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#include "fw_env.h"
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#define CMD_PRINTENV "fw_printenv"
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#define CMD_SETENV "fw_setenv"
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static struct option long_options[] = {
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{"script", required_argument, NULL, 's'},
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{"help", no_argument, NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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void usage(void)
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{
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fprintf(stderr, "fw_printenv/fw_setenv, "
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"a command line interface to U-Boot environment\n\n"
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"usage:\tfw_printenv [-n] [variable name]\n"
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"\tfw_setenv [variable name] [variable value]\n"
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"\tfw_setenv -s [ file ]\n"
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"\tfw_setenv -s - < [ file ]\n\n"
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"The file passed as argument contains only pairs "
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"name / value\n"
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"Example:\n"
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"# Any line starting with # is treated as comment\n"
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"\n"
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"\t netdev eth0\n"
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"\t kernel_addr 400000\n"
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"\t var1\n"
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"\t var2 The quick brown fox jumps over the "
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"lazy dog\n"
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"\n"
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"A variable without value will be dropped. It is possible\n"
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"to put any number of spaces between the fields, but any\n"
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"space inside the value is treated as part of the value "
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"itself.\n\n"
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);
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}
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int main(int argc, char *argv[])
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{
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char *p;
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char *cmdname = *argv;
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char *script_file = NULL;
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int c;
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const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
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int lockfd = -1;
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int retval = EXIT_SUCCESS;
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lockfd = open(lockname, O_WRONLY | O_CREAT | O_TRUNC, 0666);
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if (-1 == lockfd) {
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fprintf(stderr, "Error opening lock file %s\n", lockname);
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return EXIT_FAILURE;
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}
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if (-1 == flock(lockfd, LOCK_EX)) {
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fprintf(stderr, "Error locking file %s\n", lockname);
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close(lockfd);
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return EXIT_FAILURE;
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}
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if ((p = strrchr (cmdname, '/')) != NULL) {
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cmdname = p + 1;
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}
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while ((c = getopt_long (argc, argv, "ns:h",
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long_options, NULL)) != EOF) {
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switch (c) {
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case 'n':
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/* handled in fw_printenv */
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break;
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case 's':
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script_file = optarg;
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break;
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case 'h':
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usage();
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goto exit;
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default: /* '?' */
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fprintf(stderr, "Try `%s --help' for more information."
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"\n", cmdname);
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retval = EXIT_FAILURE;
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goto exit;
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}
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}
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if (strcmp(cmdname, CMD_PRINTENV) == 0) {
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if (fw_printenv(argc, argv) != 0)
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retval = EXIT_FAILURE;
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} else if (strcmp(cmdname, CMD_SETENV) == 0) {
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if (!script_file) {
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if (fw_setenv(argc, argv) != 0)
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retval = EXIT_FAILURE;
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} else {
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if (fw_parse_script(script_file) != 0)
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retval = EXIT_FAILURE;
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}
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} else {
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fprintf(stderr,
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"Identity crisis - may be called as `" CMD_PRINTENV
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"' or as `" CMD_SETENV "' but not as `%s'\n",
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cmdname);
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retval = EXIT_FAILURE;
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}
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exit:
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flock(lockfd, LOCK_UN);
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close(lockfd);
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return retval;
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}
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