tools: env: update usage strings

Signed-off-by: Andreas Fenkart <andreas.fenkart@digitalstrom.com>

tools/env/fw_env_main.c

@@ -36,12 +36,16 @@
 #include <unistd.h>
 #include "fw_env.h"
 
-#define	CMD_PRINTENV	"fw_printenv"
+#define CMD_PRINTENV	"fw_printenv"
 #define CMD_SETENV	"fw_setenv"
+static int do_printenv;
 
 static struct option long_options[] = {
-	{"script", required_argument, NULL, 's'},
+	{"aes", required_argument, NULL, 'a'},
+	{"config", required_argument, NULL, 'c'},
 	{"help", no_argument, NULL, 'h'},
+	{"script", required_argument, NULL, 's'},
+	{"noheader", required_argument, NULL, 'n'},
 	{NULL, 0, NULL, 0}
 };
 
@@ -49,36 +53,58 @@ struct common_args common_args;
 struct printenv_args printenv_args;
 struct setenv_args setenv_args;
 
-void usage(void)
+void usage_printenv(void)
 {
 
-	fprintf(stderr, "fw_printenv/fw_setenv, "
-		"a command line interface to U-Boot environment\n\n"
-#ifndef CONFIG_FILE
-		"usage:\tfw_printenv [-a key] [-n] [variable name]\n"
-		"\tfw_setenv [-a key] [variable name] [variable value]\n"
-#else
-		"usage:\tfw_printenv [-c /my/fw_env.config] [-a key] [-n] [variable name]\n"
-		"\tfw_setenv [-c /my/fw_env.config] [-a key] [variable name] [variable value]\n"
+	fprintf(stderr,
+		"Usage: fw_printenv [OPTIONS]... [VARIABLE]...\n"
+		"Print variables from U-Boot environment\n"
+		"\n"
+		" -h, --help           print this help.\n"
+#ifdef CONFIG_ENV_AES
+		" -a, --aes            aes key to access environment\n"
 #endif
-		"\tfw_setenv -s [ file ]\n"
-		"\tfw_setenv -s - < [ file ]\n\n"
-		"The file passed as argument contains only pairs "
-		"name / value\n"
-		"Example:\n"
-		"# Any line starting with # is treated as comment\n"
+#ifdef CONFIG_FILE
+		" -c, --config         configuration file, default:" CONFIG_FILE "\n"
+#endif
+		" -n, --noheader       do not repeat variable name in output\n"
+		"\n");
+}
+
+void usage_setenv(void)
+{
+	fprintf(stderr,
+		"Usage: fw_setenv [OPTIONS]... [VARIABLE]...\n"
+		"Modify variables in U-Boot environment\n"
+		"\n"
+		" -h, --help           print this help.\n"
+#ifdef CONFIG_ENV_AES
+		" -a, --aes            aes key to access environment\n"
+#endif
+#ifdef CONFIG_FILE
+		" -c, --config         configuration file, default:" CONFIG_FILE "\n"
+#endif
+		" -s, --script         batch mode to minimize writes\n"
+		"\n"
+		"Examples:\n"
+		"  fw_setenv foo bar   set variable foo equal bar\n"
+		"  fw_setenv foo       clear variable foo\n"
+		"  fw_setenv --script file run batch script\n"
 		"\n"
-		"\t      netdev         eth0\n"
-		"\t      kernel_addr    400000\n"
-		"\t      var1\n"
-		"\t      var2          The quick brown fox jumps over the "
-		"lazy dog\n"
+		"Script Syntax:\n"
+		"  key [space] value\n"
+		"  lines starting with '#' are treated as commment\n"
 		"\n"
-		"A variable without value will be dropped. It is possible\n"
-		"to put any number of spaces between the fields, but any\n"
-		"space inside the value is treated as part of the value "
-		"itself.\n\n"
-	);
+		"  A variable without value will be deleted. Any number of spaces are\n"
+		"  allowed between key and value. Space inside of the value is treated\n"
+		"  as part of the value itself.\n"
+		"\n"
+		"Script Example:\n"
+		"  netdev         eth0\n"
+		"  kernel_addr    400000\n"
+		"  foo            empty empty empty    empty empty empty\n"
+		"  bar\n"
+		"\n");
 }
 
 static void parse_common_args(int argc, char *argv[])
@@ -105,7 +131,7 @@ static void parse_common_args(int argc, char *argv[])
 			break;
 #endif
 		case 'h':
-			usage();
+			do_printenv ? usage_printenv() : usage_setenv();
 			exit(EXIT_SUCCESS);
 			break;
 		default:
@@ -137,7 +163,7 @@ int parse_printenv_args(int argc, char *argv[])
 			/* ignore common options */
 			break;
 		default: /* '?' */
-			usage();
+			usage_printenv();
 			exit(EXIT_FAILURE);
 			break;
 		}
@@ -163,7 +189,7 @@ int parse_setenv_args(int argc, char *argv[])
 			/* ignore common options */
 			break;
 		default: /* '?' */
-			usage();
+			usage_setenv();
 			exit(EXIT_FAILURE);
 			break;
 		}
@@ -173,27 +199,34 @@ int parse_setenv_args(int argc, char *argv[])
 
 int main(int argc, char *argv[])
 {
-	char *cmdname = *argv;
 	const char *lockname = "/var/lock/" CMD_PRINTENV ".lock";
 	int lockfd = -1;
 	int retval = EXIT_SUCCESS;
+	char *_cmdname;
 
-	if (strrchr(cmdname, '/') != NULL)
-		cmdname = strrchr(cmdname, '/') + 1;
+	_cmdname = *argv;
+	if (strrchr(_cmdname, '/') != NULL)
+		_cmdname = strrchr(_cmdname, '/') + 1;
 
-	if (strcmp(cmdname, CMD_PRINTENV) == 0) {
-		if (parse_printenv_args(argc, argv))
-			exit(EXIT_FAILURE);
-	} else if (strcmp(cmdname, CMD_SETENV) == 0) {
-		if (parse_setenv_args(argc, argv))
-			exit(EXIT_FAILURE);
+	if (strcmp(_cmdname, CMD_PRINTENV) == 0) {
+		do_printenv = 1;
+	} else if (strcmp(_cmdname, CMD_SETENV) == 0) {
+		do_printenv = 0;
 	} else {
 		fprintf(stderr,
 			"Identity crisis - may be called as `%s' or as `%s' but not as `%s'\n",
-			CMD_PRINTENV, CMD_SETENV, cmdname);
+			CMD_PRINTENV, CMD_SETENV, _cmdname);
 		exit(EXIT_FAILURE);
 	}
 
+	if (do_printenv) {
+		if (parse_printenv_args(argc, argv))
+			exit(EXIT_FAILURE);
+	} else {
+		if (parse_setenv_args(argc, argv))
+			exit(EXIT_FAILURE);
+	}
+
 	/* shift parsed flags, jump to non-option arguments */
 	argc -= optind;
 	argv += optind;
@@ -210,10 +243,10 @@ int main(int argc, char *argv[])
 		return EXIT_FAILURE;
 	}
 
-	if (strcmp(cmdname, CMD_PRINTENV) == 0) {
+	if (do_printenv) {
 		if (fw_printenv(argc, argv) != 0)
 			retval = EXIT_FAILURE;
-	} else if (strcmp(cmdname, CMD_SETENV) == 0) {
+	} else {
 		if (!setenv_args.script_file) {
 			if (fw_setenv(argc, argv) != 0)
 				retval = EXIT_FAILURE;