src/helper: usage/help updates

Make "usage" messages use the same EBNF as the User's Guide;
no angle brackets.  Improve and correct various helptexts.

Don't use "&function"; a function's name is its address.
Fix some whitespace glitches, shrink a few overlong lines.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

3 files changed, 81 insertions, 57 deletions

diff --git a/src/helper/command.c b/src/helper/command.c
index 0ddcd01..288ed72 100644
--- a/src/helper/command.c
+++ b/src/helper/command.c
@@ -1087,6 +1087,7 @@ static int jim_command_mode(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 {
 	struct command_context *cmd_ctx = current_command_context(interp);
 	enum command_mode mode;
+
 	if (argc > 1)
 	{
 		struct command *c = cmd_ctx->commands;
@@ -1223,7 +1224,7 @@ COMMAND_HANDLER(handle_help_add_command)
 	return help_add_command(CMD_CTX, c, cmd_name, help, usage);
 }
 
-/* sleep command sleeps for <n> miliseconds
+/* sleep command sleeps for <n> milliseconds
  * this is useful in target startup scripts
  */
 COMMAND_HANDLER(handle_sleep_command)
@@ -1263,19 +1264,22 @@ static const struct command_registration command_subcommand_handlers[] = {
 	{
 		.name = "mode",
 		.mode = COMMAND_ANY,
-		.jim_handler = &jim_command_mode,
-		.usage = "[<name> ...]",
+		.jim_handler = jim_command_mode,
+		.usage = "[command_name ...]",
 		.help = "Returns the command modes allowed by a  command:"
 			"'any', 'config', or 'exec'.  If no command is"
-			"specified, returns the current command mode.",
+			"specified, returns the current command mode.  "
+			"Returns 'unknown' if an unknown command is given. "
+			"Command can be multiple tokens.",
 	},
 	{
 		.name = "type",
 		.mode = COMMAND_ANY,
-		.jim_handler = &jim_command_type,
-		.usage = "<name> ...",
+		.jim_handler = jim_command_type,
+		.usage = "command_name [...]",
 		.help = "Returns the type of built-in command:"
-			"'native', 'simple', 'group', or 'unknown'",
+			"'native', 'simple', 'group', or 'unknown'. "
+			"Command can be multiple tokens.",
 	},
 	COMMAND_REGISTRATION_DONE
 };
@@ -1283,39 +1287,43 @@ static const struct command_registration command_subcommand_handlers[] = {
 static const struct command_registration command_builtin_handlers[] = {
 	{
 		.name = "add_help_text",
-		.handler = &handle_help_add_command,
+		.handler = handle_help_add_command,
 		.mode = COMMAND_ANY,
-		.help = "add new command help text",
-		.usage = "<command> [...] <help_text>]",
+		.help = "Add new command help text; "
+			"Command can be multiple tokens.",
+		.usage = "command_name helptext_string",
 	},
 	{
 		.name = "add_usage_text",
-		.handler = &handle_help_add_command,
+		.handler = handle_help_add_command,
 		.mode = COMMAND_ANY,
-		.help = "add new command usage text",
-		.usage = "<command> [...] <usage_text>]",
+		.help = "Add new command usage text; "
+			"command can be multiple tokens.",
+		.usage = "command_name usage_string",
 	},
 	{
 		.name = "sleep",
-		.handler = &handle_sleep_command,
+		.handler = handle_sleep_command,
 		.mode = COMMAND_ANY,
-		.help = "sleep for n milliseconds.  "
-			"\"busy\" will busy wait",
-		.usage = "<n> [busy]",
+		.help = "Sleep for specified number of milliseconds.  "
+			"\"busy\" will busy wait instead (avoid this).",
+		.usage = "milliseconds ['busy']",
 	},
 	{
 		.name = "help",
-		.handler = &handle_help_command,
+		.handler = handle_help_command,
 		.mode = COMMAND_ANY,
-		.help = "show full command help",
-		.usage = "[<command> ...]",
+		.help = "Show full command help; "
+			"command can be multiple tokens.",
+		.usage = "[command_name]",
 	},
 	{
 		.name = "usage",
-		.handler = &handle_help_command,
+		.handler = handle_help_command,
 		.mode = COMMAND_ANY,
-		.help = "show basic command usage",
-		.usage = "[<command> ...]",
+		.help = "Show basic command usage; "
+			"command can be multiple tokens.",
+		.usage = "[command_name]",
 	},
 	{
 		.name = "command",
diff --git a/src/helper/ioutil.c b/src/helper/ioutil.c
index 27bffad..14f6e91 100644
--- a/src/helper/ioutil.c
+++ b/src/helper/ioutil.c
@@ -191,6 +191,7 @@ COMMAND_HANDLER(handle_append_command)
 
 	int retval = ERROR_FAIL;
 	FILE *config_file = NULL;
+
 	config_file = fopen(CMD_ARGV[0], "a");
 	if (config_file != NULL)
 	{
@@ -199,7 +200,8 @@ COMMAND_HANDLER(handle_append_command)
 		unsigned i;
 		for (i = 1; i < CMD_ARGC; i++)
 		{
-			if (fwrite(CMD_ARGV[i], 1, strlen(CMD_ARGV[i]), config_file) != strlen(CMD_ARGV[i]))
+			if (fwrite(CMD_ARGV[i], 1, strlen(CMD_ARGV[i]),
+					config_file) != strlen(CMD_ARGV[i]))
 				break;
 			if (i != CMD_ARGC - 1)
 			{
@@ -208,9 +210,8 @@ COMMAND_HANDLER(handle_append_command)
 			}
 		}
 		if ((i == CMD_ARGC) && (fwrite("\n", 1, 1, config_file) == 1))
-		{
 			retval = ERROR_OK;
-		}
+
 		fclose(config_file);
 	}
 
@@ -619,76 +620,86 @@ static int zylinjtag_Jim_Command_mac(Jim_Interp *interp, int argc,
 static const struct command_registration ioutil_command_handlers[] = {
 	{
 		.name = "cat",
-		.handler = &handle_cat_command,
+		.handler = handle_cat_command,
 		.mode = COMMAND_ANY,
-		.help = "display file content",
-		.usage= "<file_name>",
+		.help = "display text file content",
+		.usage= "file_name",
 	},
 	{
 		.name = "trunc",
-		.handler = &handle_trunc_command,
+		.handler = handle_trunc_command,
 		.mode = COMMAND_ANY,
-		.help = "truncate a file 0 size",
-		.usage= "<file_name>",
+		.help = "truncate a file to zero length",
+		.usage= "file_name",
 	},
 	{
 		.name = "cp",
-		.handler = &handle_cp_command,
+		.handler = handle_cp_command,
 		.mode = COMMAND_ANY,
 		.help = "copy a file",
-		.usage = "<src> <dst>",
+		.usage = "src_file_name dst_file_name",
 	},
 	{
 		.name = "append_file",
-		.handler = &handle_append_command,
+		.handler = handle_append_command,
 		.mode = COMMAND_ANY,
 		.help = "append a variable number of strings to a file",
-		.usage= "<file_name> [<string> ...]",
+		.usage= "file_name [string ...]",
 	},
 	{
 		.name = "meminfo",
-		.handler = &handle_meminfo_command,
+		.handler = handle_meminfo_command,
 		.mode = COMMAND_ANY,
-		.help = "display available ram memory",
+		.help = "display free heap space",
 	},
 	{
 		.name = "rm",
 		.mode = COMMAND_ANY,
-		.handler = &handle_rm_command,
-		.help = "remove a file",
-		.usage = "<file>",
+		.handler = handle_rm_command,
+		.help = "remove a directory or file",
+		.usage = "file_name",
 	},
+
+	/*
+	 * REVISIT shouldn't most, or all, these zylinjtag_*()
+	 * entries be #ifdef ZY1000?  If not, why so they have
+	 * those names?
+	 *
+	 * Peek and poke are security holes -- they manipulate
+	 * server-internal addresses.
+	 */
+
 	// jim handlers
 	{
 		.name = "peek",
 		.mode = COMMAND_ANY,
-		.jim_handler = &zylinjtag_Jim_Command_peek,
+		.jim_handler = zylinjtag_Jim_Command_peek,
 		.help = "peek at a memory address",
-		.usage = "<addr>",
+		.usage = "address",
 	},
 	{
 		.name = "poke",
 		.mode = COMMAND_ANY,
-		.jim_handler = &zylinjtag_Jim_Command_poke,
+		.jim_handler = zylinjtag_Jim_Command_poke,
 		.help = "poke at a memory address",
-		.usage = "<addr> <value>",
+		.usage = "address value",
 	},
 	{
 		.name = "ls",
 		.mode = COMMAND_ANY,
-		.jim_handler = &zylinjtag_Jim_Command_ls,
+		.jim_handler = zylinjtag_Jim_Command_ls,
 		.help = "show a listing of files",
-		.usage = "<dir>",
+		.usage = "dirname",
 	},
 	{
 		.name = "mac",
 		.mode = COMMAND_ANY,
-		.jim_handler = &zylinjtag_Jim_Command_mac,
+		.jim_handler = zylinjtag_Jim_Command_mac,
 		.help = "show MAC address",
 	},
 	{
 		.name = "ip",
-		.jim_handler = &zylinjtag_Jim_Command_ip,
+		.jim_handler = zylinjtag_Jim_Command_ip,
 		.mode = COMMAND_ANY,
 		.help = "show IP address",
 	},
diff --git a/src/helper/log.c b/src/helper/log.c
index 6adde4b..7450fef 100644
--- a/src/helper/log.c
+++ b/src/helper/log.c
@@ -286,13 +286,16 @@ COMMAND_HANDLER(handle_debug_level_command)
 
 	if (debug_level >= LOG_LVL_DEBUG && server_use_pipes == 1)
 	{
-		/* if we are enabling debug info then we need to write to a log file
-		 * otherwise the pipe will get full and cause issues with gdb */
+		/* if we are enabling debug info then we need to write to a
+		 * log file otherwise the pipe will get full and cause issues
+		 * with gdb
+		 */
 		FILE* file = fopen("openocd.log", "w");
 		if (file)
 		{
 			log_output = file;
-			LOG_WARNING("enabling log output as we are using pipes");
+			LOG_WARNING("enabling logfile output because "
+				"we are using pipes to talk to GDB.");
 		}
 	}
 
@@ -319,17 +322,19 @@ COMMAND_HANDLER(handle_log_output_command)
 static struct command_registration log_command_handlers[] = {
 	{
 		.name = "log_output",
-		.handler = &handle_log_output_command,
+		.handler = handle_log_output_command,
 		.mode = COMMAND_ANY,
 		.help = "redirect logging to a file (default: stderr)",
-		.usage = "<file_name>",
+		.usage = "file_name",
 	},
 	{
 		.name = "debug_level",
-		.handler = &handle_debug_level_command,
+		.handler = handle_debug_level_command,
 		.mode = COMMAND_ANY,
-		.help = "sets the verbosity level of debugging output",
-		.usage = "<level:0-3>",
+		.help = "Sets the verbosity level of debugging output. "
+			"0 shows errors only; 1 adds warnings; "
+			"2 (default) adds other info; 3 adds debugging.",
+		.usage = "number",
 	},
 	COMMAND_REGISTRATION_DONE
 };