lvm2/tools/command.c

/*
 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
 * Copyright (C) 2004-2024 Red Hat, Inc. All rights reserved.
 *
 * This file is part of LVM2.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License v.2.1.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <unistd.h>
#include <dirent.h>
#include <ctype.h>

#ifndef MAN_PAGE_GENERATOR
#include "tools.h"
#endif /* MAN_PAGE_GENERATOR */

#include "command.h"       /* defines struct command */
#include "command-count.h" /* defines COMMAND_COUNT */

/* see cmd_names[] below, one for each unique "ID" in command-lines.in */

struct cmd_name {
	const char *enum_name; /* "foo_CMD" */
	int cmd_enum;          /* foo_CMD */
	const char *name;      /* "foo" from string after ID: */
};

/* create table of value names, e.g. String, and corresponding enum from vals.h */

struct val_name val_names[VAL_COUNT + 1] = {
#define val(a, b, c, d) { # a, a, b, c, d },
#include "vals.h"
#undef val
};

/* create table of option names, e.g. --foo, and corresponding enum from args.h */

struct opt_name opt_names[ARG_COUNT + 1] = {
#define arg(a, b, c, d, e, f, g) { # a, a, b, "", "--" c, d, e, f, g },
#include "args.h"
#undef arg
};

/* create table of lv property names, e.g. lv_is_foo, and corresponding enum from lv_props.h */

struct lv_prop lv_props[LVP_COUNT + 1] = {
#define lvp(a, b, c) { # a, a, b, c },
#include "lv_props.h"
#undef lvp
};

/* create table of lv type names, e.g. linear and corresponding enum from lv_types.h */

struct lv_type lv_types[LVT_COUNT + 1] = {
#define lvt(a, b, c) { # a, a, b, c },
#include "lv_types.h"
#undef lvt
};

/* create table of command IDs */

struct cmd_name cmd_names[CMD_COUNT + 1] = {
#define cmd(a, b) { # a, a, # b },
#include "../include/cmds.h"
#undef cmd
};

/*
 * command_names[] and commands[] are defined in lvmcmdline.c when building lvm,
 * but need to be defined here when building the stand-alone man page generator.
 */

#ifdef MAN_PAGE_GENERATOR

struct command_name command_names[] = {
#define xx(a, b, c...) { # a, b, c },
#include "commands.h"
#undef xx
	{ .name = NULL }
};
struct command commands[COMMAND_COUNT];

#else /* MAN_PAGE_GENERATOR */

struct command_name command_names[] = {
#define xx(a, b, c...) { # a, b, c, a},
#include "commands.h"
#undef xx
	{ .name = NULL }
};
extern struct command commands[COMMAND_COUNT]; /* defined in lvmcmdline.c */

#endif /* MAN_PAGE_GENERATOR */

/* array of pointers into opt_names[] that is sorted alphabetically (by long opt name) */

struct opt_name *opt_names_alpha[ARG_COUNT + 1];

/* lvm_all is for recording options that are common for all lvm commands */

struct command lvm_all;

/* saves OO_FOO lines (groups of optional options) to include in multiple defs */

static int _oo_line_count;
#define MAX_OO_LINES 256

struct oo_line {
	char *name;
	char *line;
};
static struct oo_line _oo_lines[MAX_OO_LINES];

#define REQUIRED 1  /* required option */
#define OPTIONAL 0  /* optional option */
#define IGNORE (-1)   /* ignore option */

#define MAX_LINE 1024
#define MAX_LINE_ARGC 256
#define DESC_LINE 1024

/*
 * Contains _command_input[] which is command-lines.in with comments
 * removed and wrapped as a string.  The _command_input[] string is
 * used to populate commands[].
 */
#include "command-lines-input.h"

static void __add_optional_opt_line(struct cmd_context *cmdtool, struct command *cmd, int argc, char *argv[]);

static unsigned _was_hyphen = 0;
static void printf_hyphen(char c)
{
	/* When .hy 1 was printed, we do not want to emit empty space */
	printf("%c%c\n", _was_hyphen ? '\n' : ' ', c);
	_was_hyphen = 0;
}

/*
 * modifies buf, replacing the sep characters with \0
 * argv pointers point to positions in buf
 */

static void _split_line(char *buf, int *argc, char **argv, char sep)
{
	char *p = buf;
	int i;

	argv[0] = p;

	for (i = 1; i < MAX_LINE_ARGC; i++) {
		p = strchr(p, sep);
		if (!p)
			break;
		*p++ = '\0';

		argv[i] = p;
	}
	*argc = i;
}

/* convert value string, e.g. Number, to foo_VAL enum */

static int _val_str_to_num(char *str)
{
	char name[MAX_LINE_ARGC];
	char *new;
	int i;

	/* compare the name before any suffix like _new or _<lvtype> */

	if (!_dm_strncpy(name, str, sizeof(name)))
		return 0; /* Buffer is too short */

	if ((new = strchr(name, '_')))
		*new = '\0';

	for (i = 0; i < VAL_COUNT; i++) {
		if (!val_names[i].name)
			break;
		if (!strncmp(name, val_names[i].name, strlen(val_names[i].name)))
			return val_names[i].val_enum;
	}

	return 0;
}

/* convert "--option" to foo_ARG enum */

#define MAX_LONG_OPT_NAME_LEN 32

static int _opt_str_to_num(struct command *cmd, const char *str)
{
	char long_name[MAX_LONG_OPT_NAME_LEN];
	char *p = NULL;
	int i;
	int first = 0, last = ARG_COUNT - 1, middle;

	if (!_dm_strncpy(long_name, str, sizeof(long_name)))
		goto err;

	if ((p = strstr(long_name, "_long")))
		/*
		 * --foo_long means there are two args entries
		 * for --foo, one with a short option and one
		 * without, and we want the one without the
		 * short option (== 0).
		 */
		*p = '\0';

	/* Binary search in sorted array of long options (with duplicates) */
	while (first <= last) {
		middle = first + (last - first) / 2;
		if ((i = strcmp(opt_names_alpha[middle]->long_opt, long_name)) < 0)
			first = middle + 1;
		else if (i > 0)
			last = middle - 1;
		else {
			/* Matching long option string found.
			 * As sorted array contains duplicates, we need to also
			 * check left & right side for possible match
			 */
			for (i = middle;;) {
				if ((!p && !strstr(opt_names_alpha[i]->name, "_long_ARG")) ||
				    (p && !opt_names_alpha[i]->short_opt))
					return opt_names_alpha[i]->opt_enum; /* Found */
				/* Check if there is something on the 'left-side' */
				if ((i <= first) || strcmp(opt_names_alpha[--i]->long_opt, long_name))
					break;
			}

			/* Nothing on the left, so look on the 'right-side' */
			for (i = middle + 1; i <= last; ++i) {
				if (strcmp(opt_names_alpha[i]->long_opt, long_name))
					break;
				if ((!p && !strstr(opt_names_alpha[i]->name, "_long_ARG")) ||
				    (p && !opt_names_alpha[i]->short_opt))
					return opt_names_alpha[i]->opt_enum; /* Found */
			}

			break; /* Nothing... */
		}
	}
err:
	log_error("Parsing command defs: unknown opt str: \"%s\"%s%s.",
		  str, p ? " ": "", p ? long_name : "");
	cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;

	return ARG_UNUSED;
}

/* "foo" string to foo_CMD int */

int command_id_to_enum(const char *str)
{
	int i;
	int first = 1, last = CMD_COUNT - 1, middle;

	while (first <= last) {
		middle = first + (last - first) / 2;
		if ((i = strcmp(cmd_names[middle].name, str)) < 0)
			first = middle + 1;
		else if (i > 0)
			last = middle - 1;
		else
			return cmd_names[middle].cmd_enum;
	}

	log_error("Cannot find command %s.", str);
	return CMD_NONE;
}

/* "lv_is_prop" to is_prop_LVP */

static int _lvp_name_to_enum(struct command *cmd, const char *str)
{
	int i;

	for (i = 1; i < LVP_COUNT; i++) {
		if (!strcmp(str, lv_props[i].name))
			return lv_props[i].lvp_enum;
	}

	log_error("Parsing command defs: unknown lv property %s.", str);
	cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
	return LVP_NONE;
}

/* "type" to type_LVT */

static int _lvt_name_to_enum(struct command *cmd, const char *str)
{
	int i;

	for (i = 1; i < LVT_COUNT; i++) {
		if (!strcmp(str, lv_types[i].name))
			return lv_types[i].lvt_enum;
	}

	log_error("Parsing command defs: unknown lv type %s.", str);
	cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
	return LVT_NONE;
}

/* LV_<type> to <type>_LVT */

static int _lv_to_enum(struct command *cmd, const char *name)
{
	return _lvt_name_to_enum(cmd, name + 3);
}

/*
 * LV_<type1>_<type2> to lvt_bits
 *
 * type1 to lvt_enum
 * lvt_bits |= lvt_enum_to_bit(lvt_enum)
 * type2 to lvt_enum
 * lvt_bits |= lvt_enum_to_bit(lvt_enum)
 */

#define LVTYPE_LEN 128

static uint64_t _lv_to_bits(struct command *cmd, char *name)
{
	char buf[LVTYPE_LEN];
	char *argv[MAX_LINE_ARGC];
	uint64_t lvt_bits = 0;
	int lvt_enum;
	int argc;
	int i;

	dm_strncpy(buf, name, sizeof(buf));

	_split_line(buf, &argc, argv, '_');

	/* 0 is "LV" */
	for (i = 1; i < argc; i++) {
		if (!strcmp(argv[i], "new"))
			continue;
		lvt_enum = _lvt_name_to_enum(cmd, argv[i]);
		lvt_bits |= lvt_enum_to_bit(lvt_enum);
	}

	return lvt_bits;
}

struct command_name *find_command_name(const char *name)
{
	static int _command_names_count = -1;
	int first = 0, last, middle;
	int i;

	if (_command_names_count == -1) {
		/* Validate cmd_names & command_names arrays are properly sorted */
		for (i = 1; i < CMD_COUNT - 2; i++)
			if (strcmp(cmd_names[i].name, cmd_names[i + 1].name) > 0) {
				log_error("File cmds.h has unsorted name entry %s.",
					  cmd_names[i].name);
				return 0;
			}
		for (i = 1; command_names[i].name; i++) /* assume > 1 */
			if (strcmp(command_names[i - 1].name, command_names[i].name) > 0) {
				log_error("File commands.h has unsorted name entry %s.",
					  command_names[i].name);
				return 0;
			}
		_command_names_count = i - 1;
	}
	last = _command_names_count;

	while (first <= last) {
		middle = first + (last - first) / 2;
		if ((i = strcmp(command_names[middle].name, name)) < 0)
			first = middle + 1;
		else if (i > 0)
			last = middle - 1;
		else
			return &command_names[middle];
	}

	return NULL;
}

static struct command_name *_find_command_name(const char *name)
{
	if (!islower(name[0]))
		return NULL; /* Commands starts with lower-case */

	return find_command_name(name);
}

static const char *_is_command_name(char *str)
{
	const struct command_name *c;

	if ((c = _find_command_name(str)))
		return c->name;

	return NULL;
}

static int _is_opt_name(char *str)
{
	if ((str[0] == '-') && (str[1] == '-'))
		return 1;

	if ((str[0] == '-') && (str[1] != '-'))
		log_error("Parsing command defs: options must be specified in long form: %s.", str);

	return 0;
}

/*
 * "Select" as a pos name means that the position
 * can be empty if the --select option is used.
 */

static int _is_pos_name(char *str)
{
	switch (str[0]) {
	case 'V': return (str[1] == 'G'); /* VG */
	case 'L': return (str[1] == 'V'); /* LV */
	case 'P': return (str[1] == 'V'); /* PV */
	case 'T': return (strncmp(str, "Tag", 3) == 0);
	case 'S': return ((strncmp(str, "String", 6) == 0) ||
			  (strncmp(str, "Select", 6) == 0));
	}

	return 0;
}

static int _is_oo_definition(char *str)
{
	if (!strncmp(str, "OO_", 3) && strchr(str, ':'))
		return 1;
	return 0;
}

static int _is_oo_line(char *str)
{
	if (!strncmp(str, "OO:", 3))
		return 1;
	return 0;
}

static int _is_io_line(char *str)
{
	if (!strncmp(str, "IO:", 3))
		return 1;
	return 0;
}

static int _is_op_line(char *str)
{
	if (!strncmp(str, "OP:", 3))
		return 1;
	return 0;
}

static int _is_desc_line(char *str)
{
	if (!strncmp(str, "DESC:", 5))
		return 1;
	return 0;
}

static int _is_autotype_line(char *str)
{
	if (!strncmp(str, "AUTOTYPE:", 6))
		return 1;
	return 0;
}

static int _is_flags_line(char *str)
{
	if (!strncmp(str, "FLAGS:", 6))
		return 1;
	return 0;
}

static int _is_rule_line(char *str)
{
	if (!strncmp(str, "RULE:", 5))
		return 1;
	return 0;
}

static int _is_id_line(char *str)
{
	if (!strncmp(str, "ID:", 3))
		return 1;
	return 0;
}

/*
 * Save a positional arg in a struct arg_def.
 * Parse str for anything that can appear in a position,
 * like VG, VG|LV, VG|LV_linear|LV_striped, etc.
 */

static void _set_pos_def(struct command *cmd, char *str, struct arg_def *def)
{
	char *argv[MAX_LINE_ARGC];
	int argc;
	char *name;
	int val_enum;
	int i;

	_split_line(str, &argc, argv, '|');

	for (i = 0; i < argc; i++) {
		name = argv[i];

		val_enum = _val_str_to_num(name);

		if (!val_enum) {
			log_error("Parsing command defs: unknown pos arg: %s.", name);
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}

		def->val_bits |= val_enum_to_bit(val_enum);

		if ((val_enum == lv_VAL) && strchr(name, '_'))
			def->lvt_bits = _lv_to_bits(cmd, name);

		if (strstr(name, "_new")) {
			if (val_enum == lv_VAL)
				def->flags |= ARG_DEF_FLAG_NEW_LV;
			else if (val_enum == vg_VAL)
				def->flags |= ARG_DEF_FLAG_NEW_VG;
		}
	}
}

/*
 * Save an option arg in a struct arg_def.
 * Parse str for anything that can follow --option.
 */
static void _set_opt_def(struct cmd_context *cmdtool, struct command *cmd, char *str, struct arg_def *def)
{
	char *argv[MAX_LINE_ARGC];
	int argc;
	char *name;
	int val_enum;
	int i;

	_split_line(str, &argc, argv, '|');

	for (i = 0; i < argc; i++) {
		name = argv[i];

		val_enum = _val_str_to_num(name);

		if (!val_enum) {
			/* a literal number or string */

			if (isdigit(name[0]))
				val_enum = constnum_VAL;

			else if (isalpha(name[0]))
				val_enum = conststr_VAL;

			else {
				log_error("Parsing command defs: unknown opt arg: %s.", name);
				cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
				return;
			}
		}


		def->val_bits |= val_enum_to_bit(val_enum);

		if (val_enum == constnum_VAL)
			def->num = (uint64_t)atoi(name);

		if (val_enum == conststr_VAL) {
#ifdef MAN_PAGE_GENERATOR
			free((void*)def->str);
#endif
			def->str = dm_pool_strdup(cmdtool->libmem, name);

			if (!def->str) {
				/* FIXME */
				stack;
				return;
			}
		}

		if (val_enum == lv_VAL) {
			if (strchr(name, '_'))
				def->lvt_bits = _lv_to_bits(cmd, name);
		}

		if (strstr(name, "_new")) {
			if (val_enum == lv_VAL)
				def->flags |= ARG_DEF_FLAG_NEW_LV;
			else if (val_enum == vg_VAL)
				def->flags |= ARG_DEF_FLAG_NEW_VG;
		}
	}
}

/*
 * Save a set of common options so they can be included in
 * multiple command defs.
 *
 * OO_FOO: --opt1 ...
 *
 * oo->name = "OO_FOO";
 * oo->line = "--opt1 ...";
 */

static void _add_oo_definition_line(const char *name, const char *line)
{
	struct oo_line *oo;
	char *colon;
	char *start;

	oo = &_oo_lines[_oo_line_count++];

	if (!(oo->name = strdup(name))) {
		log_error("Failer to duplicate name %s.", name);
		return; /* FIXME: return code */
	}

	if ((colon = strchr(oo->name, ':')))
		*colon = '\0';
	else {
		log_error("Parsing command defs: invalid OO definition.");
		return;
	}

	start = strchr(line, ':') + 2;
	if (!(oo->line = strdup(start))) {
		log_error("Failer to duplicate line %s.", start);
		return;
	}
}

/* Support OO_FOO: continuing on multiple lines. */

static void _append_oo_definition_line(const char *new_line)
{
	struct oo_line *oo;
	char *old_line;
	char *line;
	int len;

	oo = &_oo_lines[_oo_line_count - 1];

	old_line = oo->line;

	/* +2 = 1 space between old and new + 1 terminating \0 */
	len = strlen(old_line) + strlen(new_line) + 2;
	line = malloc(len);
	if (!line) {
		log_error("Parsing command defs: no memory.");
		return;
	}

	(void) dm_snprintf(line, len, "%s %s", old_line, new_line);
	free(oo->line);
	oo->line = line;
}

/* Find a saved OO_FOO definition. */

#define OO_NAME_LEN 128

static char *_get_oo_line(const char *str)
{
	char *name;
	char *end;
	char str2[OO_NAME_LEN];
	int i;

	dm_strncpy(str2, str, sizeof(str2));
	if ((end = strchr(str2, ':')))
		*end = '\0';
	if ((end = strchr(str2, ',')))
		*end = '\0';

	for (i = 0; i < _oo_line_count; i++) {
		name = _oo_lines[i].name;
		if (!strcmp(name, str2))
			return _oo_lines[i].line;
	}
	return NULL;
}

/*
 * Add optional_opt_args entries when OO_FOO appears on OO: line,
 * i.e. include common options from an OO_FOO definition.
 */

static void _include_optional_opt_args(struct cmd_context *cmdtool, struct command *cmd, const char *str)
{
	char *oo_line;
	char *line;
	char *line_argv[MAX_LINE_ARGC];
	int line_argc;

	if (!(oo_line = _get_oo_line(str))) {
		log_error("Parsing command defs: no OO line found for %s.", str);
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	if (!(line = strdup(oo_line))) {
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	_split_line(line, &line_argc, line_argv, ' ');
	__add_optional_opt_line(cmdtool, cmd, line_argc, line_argv);
	free(line);
}

/*
 * When an --option is seen, add a new opt_args entry for it.
 * This function sets the opt_args.opt value for it.
 */

static void _add_opt_arg(struct command *cmd, char *str,
			int *takes_arg, int *already, int required)
{
	char *comma;
	int opt;
	int i;

	/* opt_arg.opt set here */
	/* opt_arg.def will be set in _update_prev_opt_arg() if needed */

	if ((comma = strchr(str, ',')))
		*comma = '\0';

	/*
	 * Work around nasty hack where --uuid is used for both uuid_ARG
	 * and uuidstr_ARG.  The input uses --uuidstr, where an actual
	 * command uses --uuid string.
	 */
	if (!strcmp(str, "--uuidstr")) {
		opt = uuidstr_ARG;
		goto skip;
	}

	opt = _opt_str_to_num(cmd, str);

	/* If the binary-search finds uuidstr_ARG switch to uuid_ARG */
	if (opt == uuidstr_ARG)
		opt = uuid_ARG;

	/* Skip adding an optional opt if it is already included. */
	if (already && !required) {
		for (i = 0; i < cmd->oo_count; i++) {
			if (cmd->optional_opt_args[i].opt == opt) {
				*already = 1;
				*takes_arg = opt_names[opt].val_enum ? 1 : 0;
				return;
			}
		}
	}

skip:
	if (required > 0) {
		if (cmd->ro_count >= CMD_RO_ARGS) {
			log_error("Too many args, increase CMD_RO_ARGS.");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
		cmd->required_opt_args[cmd->ro_count++].opt = opt;
	} else if (!required) {
		if (cmd->oo_count >= CMD_OO_ARGS) {
			log_error("Too many args, increase CMD_OO_ARGS.");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
		cmd->optional_opt_args[cmd->oo_count++].opt = opt;
	} else if (required < 0) {
		if (cmd->io_count >= CMD_IO_ARGS) {
			log_error("Too many args, increase CMD_IO_ARGS.");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
		cmd->ignore_opt_args[cmd->io_count++].opt = opt;
	}

	*takes_arg = opt_names[opt].val_enum ? 1 : 0;
}

/*
 * After --option has been seen, this function sets opt_args.def value
 * for the value that appears after --option.
 */

static void _update_prev_opt_arg(struct cmd_context *cmdtool, struct command *cmd, char *str, int required)
{
	struct arg_def def = { 0 };
	char *comma;

	if (str[0] == '-') {
		log_error("Parsing command defs: option %s must be followed by an arg.", str);
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	/* opt_arg.def set here */
	/* opt_arg.opt was previously set in _add_opt_arg() when --foo was read */

	if ((comma = strchr(str, ',')))
		*comma = '\0';

	_set_opt_def(cmdtool, cmd, str, &def);

	if (required > 0)
		cmd->required_opt_args[cmd->ro_count-1].def = def;
	else if (!required)
		cmd->optional_opt_args[cmd->oo_count-1].def = def;
	else if (required < 0)
		cmd->ignore_opt_args[cmd->io_count-1].def = def;
}

/*
 * When an position arg is seen, add a new pos_args entry for it.
 * This function sets the pos_args.pos and pos_args.def.
 */

static void _add_pos_arg(struct command *cmd, char *str, int required)
{
	struct arg_def def = { 0 };

	/* pos_arg.pos and pos_arg.def are set here */

	_set_pos_def(cmd, str, &def);

	if (required) {
		cmd->required_pos_args[cmd->rp_count].pos = cmd->pos_count++;
		cmd->required_pos_args[cmd->rp_count].def = def;
		cmd->rp_count++;
	} else {
		cmd->optional_pos_args[cmd->op_count].pos = cmd->pos_count++;;
		cmd->optional_pos_args[cmd->op_count].def = def;
		cmd->op_count++;
	}
}

/* Process something that follows a pos arg, which is not a new pos arg. */

static void _update_prev_pos_arg(struct command *cmd, char *str, int required)
{
	struct arg_def *def;

	/* a previous pos_arg.def is modified here */

	if (required)
		def = &cmd->required_pos_args[cmd->rp_count-1].def;
	else
		def = &cmd->optional_pos_args[cmd->op_count-1].def;

	if (!strcmp(str, "..."))
		def->flags |= ARG_DEF_FLAG_MAY_REPEAT;
	else {
		log_error("Parsing command defs: unknown pos arg: %s.", str);
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}
}

/* Process what follows OO:, which are the optional opt args for the cmd def. */

static void __add_optional_opt_line(struct cmd_context *cmdtool, struct command *cmd, int argc, char *argv[])
{
	int takes_arg = 0;
	int already;
	int i;

	for (i = 0; i < argc; i++) {
		if (!i && !strncmp(argv[i], "OO:", 3))
			continue;

		already = 0;

		if (_is_opt_name(argv[i]))
			_add_opt_arg(cmd, argv[i], &takes_arg, &already, OPTIONAL);
		else if (!strncmp(argv[i], "OO_", 3))
			_include_optional_opt_args(cmdtool, cmd, argv[i]);
		else if (takes_arg)
			_update_prev_opt_arg(cmdtool, cmd, argv[i], OPTIONAL);
		else {
			log_error("Parsing command defs: can't parse argc %d argv %s%s%s.",
				i, argv[i], (i > 0) ? " prev " : "", (i > 0) ? argv[i - 1] : "");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}

		if (already && takes_arg)
			i++;
	}
}

/* Process what follows IO:, which are the ignore options for the cmd def. */

static void _add_ignore_opt_line(struct cmd_context *cmdtool, struct command *cmd, int argc, char *argv[])
{
	int takes_arg = 0;
	int i;

	for (i = 0; i < argc; i++) {
		if (!i && !strncmp(argv[i], "IO:", 3))
			continue;
		if (_is_opt_name(argv[i]))
			_add_opt_arg(cmd, argv[i], &takes_arg, NULL, IGNORE);
		else if (takes_arg)
			_update_prev_opt_arg(cmdtool, cmd, argv[i], IGNORE);
		else {
			log_error("Parsing command defs: can't parse argc %d argv %s%s%s.",
				  i, argv[i], (i > 0) ? " prev " : "", (i > 0) ? argv[i - 1] : "");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
	}
}

/* Process what follows OP:, which are optional pos args for the cmd def. */

static void _add_optional_pos_line(struct command *cmd, int argc, char *argv[])
{
	int i;

	for (i = 0; i < argc; i++) {
		if (!i && !strncmp(argv[i], "OP:", 3))
			continue;
		if (_is_pos_name(argv[i]))
			_add_pos_arg(cmd, argv[i], OPTIONAL);
		else
			_update_prev_pos_arg(cmd, argv[i], OPTIONAL);
	}
}

static void _add_required_opt_line(struct cmd_context *cmdtool, struct command *cmd, int argc, char *argv[])
{
	int takes_arg = 0;
	int i;

	for (i = 0; i < argc; i++) {
		if (_is_opt_name(argv[i]))
			_add_opt_arg(cmd, argv[i], &takes_arg, NULL, REQUIRED);
		else if (takes_arg)
			_update_prev_opt_arg(cmdtool, cmd, argv[i], REQUIRED);
		else {
			log_error("Parsing command defs: can't parse argc %d argv %s%s%s.",
				  i, argv[i], (i > 0) ? " prev " : "", (i > 0) ? argv[i - 1] : "");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
	}
}

/*
 * Add to required_opt_args from an OO_FOO definition.
 * (This is the special case of vgchange/lvchange where one
 * optional option is required, and others are then optional.)
 * The set of options from OO_FOO are saved in required_opt_args,
 * and flag CMD_FLAG_ANY_REQUIRED_OPT is set on the cmd indicating
 * this special case.
 */
static void _include_required_opt_args(struct cmd_context *cmdtool, struct command *cmd, char *str)
{
	char *oo_line;
	char *line;
	char *line_argv[MAX_LINE_ARGC];
	int line_argc;

	if (!(oo_line = _get_oo_line(str))) {
		log_error("Parsing command defs: no OO line found for %s.", str);
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	if (!(line = strdup(oo_line))) {
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	_split_line(line, &line_argc, line_argv, ' ');
	_add_required_opt_line(cmdtool, cmd, line_argc, line_argv);
	free(line);
}

/* Process what follows command_name, which are required opt/pos args. */

static void _add_required_line(struct cmd_context *cmdtool, struct command *cmd, int argc, char *argv[])
{
	int i;
	int takes_arg = 0;
	int prev_was_opt = 0, prev_was_pos = 0;
	int orig_ro_count = 0;

	/* argv[0] is command name */

	for (i = 1; i < argc; i++) {

		if (_is_opt_name(argv[i])) {
			/* add new required_opt_arg */
			_add_opt_arg(cmd, argv[i], &takes_arg, NULL, REQUIRED);
			prev_was_opt = 1;
			prev_was_pos = 0;

		} else if (prev_was_opt && takes_arg) {
			/* set value for previous required_opt_arg */
			_update_prev_opt_arg(cmdtool, cmd, argv[i], REQUIRED);
			prev_was_opt = 0;
			prev_was_pos = 0;

		} else if (_is_pos_name(argv[i])) {
			/* add new required_pos_arg */
			_add_pos_arg(cmd, argv[i], REQUIRED);
			prev_was_opt = 0;
			prev_was_pos = 1;

		} else if (!strncmp(argv[i], "OO_", 3)) {
			/*
			 * the first ro_count entries in required_opt_arg required,
			 * after which one or more of the next any_ro_count entries
			 * in required_opt_arg are required.  required_opt_arg
			 * has a total of ro_count+any_ro_count entries.
			 */
			cmd->cmd_flags |= CMD_FLAG_ANY_REQUIRED_OPT;
			orig_ro_count = cmd->ro_count;

			_include_required_opt_args(cmdtool, cmd, argv[i]);

			cmd->any_ro_count = cmd->ro_count - orig_ro_count;
			cmd->ro_count = orig_ro_count;

		} else if (prev_was_pos) {
			/* set property for previous required_pos_arg */
			_update_prev_pos_arg(cmd, argv[i], REQUIRED);
		} else {
			log_error("Parsing command defs: can't parse argc %d argv %s%s%s.",
				  i, argv[i], (i > 0) ? " prev " : "", (i > 0) ? argv[i - 1] : "");
			cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
			return;
		}
	}
}

static void _add_flags(struct command *cmd, const char *line)
{
	if (strstr(line, "SECONDARY_SYNTAX"))
		cmd->cmd_flags |= CMD_FLAG_SECONDARY_SYNTAX;
	if (strstr(line, "PREVIOUS_SYNTAX"))
		cmd->cmd_flags |= CMD_FLAG_PREVIOUS_SYNTAX;
}

static void _add_autotype(struct cmd_context *cmdtool, struct command *cmd,
			  int line_argc, char *line_argv[])
{
	if (cmd->autotype)
		cmd->autotype2 = dm_pool_strdup(cmdtool->libmem, line_argv[1]);
	else
		cmd->autotype = dm_pool_strdup(cmdtool->libmem, line_argv[1]);
}

#define MAX_RULE_OPTS 64

static void _add_rule(struct cmd_context *cmdtool, struct command *cmd,
		      int line_argc, char *line_argv[])
{
	struct cmd_rule *rule;
	const char *arg;
	int i, lvt_enum, lvp_enum;
	int check = 0;

	if (cmd->rule_count == CMD_MAX_RULES) {
		log_error("Parsing command defs: too many rules for cmd.");
		cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
		return;
	}

	rule = &cmd->rules[cmd->rule_count++];

	for (i = 0; i < line_argc; i++) {
		arg = line_argv[i];

		if (!strcmp(arg, "not")) {
			rule->rule = RULE_INVALID;
			check = 1;
		}

		else if (!strcmp(arg, "and")) {
			rule->rule = RULE_REQUIRE;
			check = 1;
		}

		else if (!strncmp(arg, "all", 3)) {
			/* opt/lvt_bits/lvp_bits all remain 0 to mean all */
			continue;
		}

		else if (!strncmp(arg, "--", 2)) {
			if (!rule->opts) {
				if (!(rule->opts = dm_pool_alloc(cmdtool->libmem, MAX_RULE_OPTS * sizeof(int)))) {
					log_error("Parsing command defs: no mem.");
					cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
					return;
				}
				memset(rule->opts, 0, MAX_RULE_OPTS * sizeof(int));
			}

			if (!rule->check_opts) {
				if (!(rule->check_opts = dm_pool_alloc(cmdtool->libmem, MAX_RULE_OPTS * sizeof(int)))) {
					log_error("Parsing command defs: no mem.");
					cmd->cmd_flags |= CMD_FLAG_PARSE_ERROR;
					return;
				}
				memset(rule->check_opts, 0, MAX_RULE_OPTS * sizeof(int));
			}

			if (check)
				rule->check_opts[rule->check_opts_count++] = _opt_str_to_num(cmd, arg);
			else
				rule->opts[rule->opts_count++] = _opt_str_to_num(cmd, arg);
		}

		else if (!strncmp(arg, "LV_", 3)) {
			lvt_enum = _lv_to_enum(cmd, arg);

			if (check)
				rule->check_lvt_bits |= lvt_enum_to_bit(lvt_enum);
			else
				rule->lvt_bits |= lvt_enum_to_bit(lvt_enum);
		}

		else if (!strncmp(arg, "lv_is_", 6)) {
			lvp_enum = _lvp_name_to_enum(cmd, arg);

			if (check)
				rule->check_lvp_bits |= lvp_enum_to_bit(lvp_enum);
			else
				rule->lvp_bits |= lvp_enum_to_bit(lvp_enum);
		}
	}
}

/* The given option is common to all lvm commands (set in lvm_all). */

static int _is_lvm_all_opt(int opt)
{
	int oo;

	for (oo = 0; oo < lvm_all.oo_count; oo++) {
		if (lvm_all.optional_opt_args[oo].opt == opt)
			return 1;
	}
	return 0;
}

/* Find common options for all variants of each command name. */

void factor_common_options(void)
{
	int cn, opt_enum, ci, oo, ro, found;
	struct command *cmd;

	for (cn = 0; command_names[cn].name; cn++) {
		/* already factored */
		if (command_names[cn].variants)
			continue;

		for (ci = 0; ci < COMMAND_COUNT; ci++) {
			cmd = &commands[ci];

			if (strcmp(cmd->name, command_names[cn].name))
				continue;

			command_names[cn].variants++;
		}

		for (opt_enum = 0; opt_enum < ARG_COUNT; opt_enum++) {

			for (ci = 0; ci < COMMAND_COUNT; ci++) {
				cmd = &commands[ci];

				if (strcmp(cmd->name, command_names[cn].name))
					continue;

				if (cmd->ro_count || cmd->any_ro_count)
					command_names[cn].variant_has_ro = 1;
				if (cmd->rp_count)
					command_names[cn].variant_has_rp = 1;
				if (cmd->oo_count)
					command_names[cn].variant_has_oo = 1;
				if (cmd->op_count)
					command_names[cn].variant_has_op = 1;

				for (ro = 0; ro < cmd->ro_count + cmd->any_ro_count; ro++) {
					command_names[cn].all_options[cmd->required_opt_args[ro].opt] = 1;

					if ((cmd->required_opt_args[ro].opt == size_ARG) && !strncmp(cmd->name, "lv", 2))
						command_names[cn].all_options[extents_ARG] = 1;
				}
				for (oo = 0; oo < cmd->oo_count; oo++)
					command_names[cn].all_options[cmd->optional_opt_args[oo].opt] = 1;

				found = 0;

				for (oo = 0; oo < cmd->oo_count; oo++) {
					if (cmd->optional_opt_args[oo].opt == opt_enum) {
						found = 1;
						break;
					}
				}

				if (!found)
					goto next_opt;
			}

			/* all commands starting with this name use this option */
			command_names[cn].common_options[opt_enum] = 1;
 next_opt:
			;
		}
	}
}

/* FIXME: use a flag in command_name struct? */

int command_has_alternate_extents(const char *name)
{
	if (name[0] != 'l')
		return 0;
	if (!strcmp(name, "lvcreate") ||
	    !strcmp(name, "lvresize") ||
	    !strcmp(name, "lvextend") ||
	    !strcmp(name, "lvreduce"))
		return 1;
	return 0;
}

static int _long_name_compare(const void *on1, const void *on2)
{
	const struct opt_name * const *optname1 = on1;
	const struct opt_name * const *optname2 = on2;

	return strcmp((*optname1)->long_opt + 2, (*optname2)->long_opt + 2);
}

/* Create list of option names for printing alphabetically. */

static void _create_opt_names_alpha(void)
{
	int i;

	for (i = 0; i < ARG_COUNT; i++)
		opt_names_alpha[i] = &opt_names[i];

	qsort(opt_names_alpha, ARG_COUNT, sizeof(long), _long_name_compare);
}

static int _copy_line(const char **line, size_t max_line, int *position)
{
	size_t len;

	*line = _command_input + *position;
	len = strlen(*line);
	*position += len + 1;
	if (len >= max_line)
		return 0;

	return len;
}

int define_commands(struct cmd_context *cmdtool, const char *run_name)
{
	struct command *cmd = NULL;
	const char *line_orig;
	char line[MAX_LINE];
	char *line_argv[MAX_LINE_ARGC];
	const char *name;
	size_t line_orig_len;
	int line_argc;
	int cmd_count = 0;
	int prev_was_oo_def = 0;
	int prev_was_oo = 0;
	int prev_was_op = 0;
	int copy_pos = 0;
	int skip = 0;
	int i;

	memset(&commands, 0, sizeof(commands));

	if (run_name && !strcmp(run_name, "help"))
		run_name = NULL;

	_create_opt_names_alpha();

	/* Process each line of command-lines-input.h (from command-lines.in) */

	while ((line_orig_len = _copy_line(&line_orig, MAX_LINE, &copy_pos)) > 0) {
		if (line_orig[0] == '-' && line_orig[1] == '-' &&
		    (!line_orig[2] || (line_orig[2] == '-' && !line_orig[3])))
			continue; /* "---"  or "--" */

		memcpy(line, line_orig, line_orig_len + 1);
		_split_line(line, &line_argc, line_argv, ' ');

		if (!line_argc)
			continue;

		/* New cmd def begins: command_name <required opt/pos args> */
		if ((name = _is_command_name(line_argv[0]))) {
			if (cmd_count >= COMMAND_COUNT) {
				return 0;
			}

			/*
			 * FIXME: when running one specific command name,
			 * we can optimize by not parsing command defs
			 * that don't start with that command name.
			 */

			cmd = &commands[cmd_count];
			cmd->command_index = cmd_count;
			cmd_count++;
			cmd->name = dm_pool_strdup(cmdtool->libmem, name);

			if (!cmd->name) {
				/* FIXME */
				stack;
				return 0;
			}

			if (run_name && strcmp(run_name, name)) {
				skip = 1;
				prev_was_oo_def = 0;
				prev_was_oo = 0;
				prev_was_op = 0;
				continue;
			}
			skip = 0;

			cmd->pos_count = 1;
			_add_required_line(cmdtool, cmd, line_argc, line_argv);

			/* Every cmd gets the OO_ALL options */
			_include_optional_opt_args(cmdtool, cmd, "OO_ALL:");
			continue;
		}

		/*
		 * All other kinds of lines are processed in the
		 * context of the existing command[].
		 */

		if (cmd && !skip && _is_desc_line(line_argv[0])) {
			if (cmd->desc) {
				size_t newlen = strlen(cmd->desc) + line_orig_len + 2;
				char *newdesc = dm_pool_alloc(cmdtool->libmem, newlen);

				if (!newdesc) {
					/* FIXME */
					stack;
					return 0;
				}

				snprintf(newdesc, newlen, "%s %s", cmd->desc, line_orig);
#ifdef MAN_PAGE_GENERATOR
				free((void*)cmd->desc);
#endif
				cmd->desc = newdesc;
			} else if (!(cmd->desc = dm_pool_strdup(cmdtool->libmem, line_orig))) {
				/* FIXME */
				stack;
				return 0;
			}

			continue;
		}

		if (cmd && !skip && _is_autotype_line(line_argv[0])) {
			_add_autotype(cmdtool, cmd, line_argc, line_argv);
			continue;
		}

		if (cmd && !skip && _is_flags_line(line_argv[0])) {
			_add_flags(cmd, line_orig);
			continue;
		}

		if (cmd && !skip && _is_rule_line(line_argv[0])) {
			_add_rule(cmdtool, cmd, line_argc, line_argv);
			continue;
		}

		if (cmd && _is_id_line(line_argv[0])) {
#ifdef MAN_PAGE_GENERATOR
			free((void*)cmd->command_id);
#endif
			cmd->command_id = dm_pool_strdup(cmdtool->libmem, line_argv[1]);

			if (!cmd->command_id) {
				/* FIXME */
				stack;
				return 0;
			}
			continue;
		}

		/* OO_FOO: ... */
		if (_is_oo_definition(line_argv[0])) {
			_add_oo_definition_line(line_argv[0], line_orig);
			prev_was_oo_def = 1;
			prev_was_oo = 0;
			prev_was_op = 0;
			continue;
		}

		/* OO: ... */
		if (cmd && !skip && _is_oo_line(line_argv[0])) {
			__add_optional_opt_line(cmdtool, cmd, line_argc, line_argv);
			prev_was_oo_def = 0;
			prev_was_oo = 1;
			prev_was_op = 0;
			continue;
		}

		/* OP: ... */
		if (cmd && !skip && _is_op_line(line_argv[0])) {
			_add_optional_pos_line(cmd, line_argc, line_argv);
			prev_was_oo_def = 0;
			prev_was_oo = 0;
			prev_was_op = 1;
			continue;
		}

		/* IO: ... */
		if (cmd && !skip && _is_io_line(line_argv[0])) {
			_add_ignore_opt_line(cmdtool, cmd, line_argc, line_argv);
			prev_was_oo = 0;
			prev_was_op = 0;
			continue;
		}

		/* handle OO_FOO:, OO:, OP: continuing on multiple lines */

		if (prev_was_oo_def) {
			_append_oo_definition_line(line_orig);
			continue;
		}

		if (prev_was_oo && cmd) {
			__add_optional_opt_line(cmdtool, cmd, line_argc, line_argv);
			continue;
		}

		if (prev_was_op && cmd) {
			_add_optional_pos_line(cmd, line_argc, line_argv);
			continue;
		}

		if (!skip) {
			log_error("Parsing command defs: can't process input line %s.", line_orig);
			return 0;
		}
	}

	for (i = 0; i < COMMAND_COUNT; i++) {
		if (commands[i].cmd_flags & CMD_FLAG_PARSE_ERROR)
			return 0;
	}

	_include_optional_opt_args(cmdtool, &lvm_all, "OO_ALL");

	for (i = 0; i < _oo_line_count; i++) {
		struct oo_line *oo = &_oo_lines[i];
		free(oo->name);
		free(oo->line);
	}
	memset(&_oo_lines, 0, sizeof(_oo_lines));
	_oo_line_count = 0;

	return 1;
}

/*
 * The opt_names[] table describes each option.  It is indexed by the
 * option typedef, e.g. size_ARG.  The size_ARG entry specifies the
 * option name, e.g. --size, and the kind of value it accepts,
 * e.g. sizemb_VAL.
 *
 * The val_names[] table describes each option value type.  It is indexed by
 * the value typedef, e.g. sizemb_VAL.  The sizemb_VAL entry specifies the
 * function used to parse the value, e.g. size_mb_arg(), the string used to
 * refer to the value in the command-lines.in specifications, e.g. SizeMB,
 * and how the value should be displayed in a man page, e.g. Size[m|UNIT].
 *
 * A problem is that these tables are independent of a particular command
 * (they are created at build time), but different commands accept different
 * types of values for the same option, e.g. one command will accept
 * signed size values (ssizemb_VAL), while another does not accept a signed
 * number, (sizemb_VAL).  This function deals with this problem by tweaking
 * the opt_names[] table at run time according to the specific command being run.
 * i.e. it changes size_ARG to accept sizemb_VAL or ssizemb_VAL depending
 * on the command.
 *
 * By default, size_ARG in opt_names[] is set up to accept a standard
 * sizemb_VAL.  The same is done for other opt_names[] entries that
 * take different option values.
 *
 * This function overrides default opt_names[] entries at run time according
 * to the command name, adjusting the value types accepted by various options.
 * So, for lvresize, opt_names[sizemb_VAL] is overridden to accept
 * the relative (+ or -) value type ssizemb_VAL, instead of the default
 * sizemb_VAL.  This way, when lvresize processes the --size value, it
 * will use the ssize_mb_arg() function which accepts relative size values.
 * When lvcreate processes the --size value, it uses size_mb_arg() which
 * rejects signed values.
 *
 * The command defs in commands[] do not need to be overridden because
 * the command-lines.in defs have the context of a command, and are
 * described using the proper value type, e.g. this cmd def already
 * uses the relative size value: "lvresize --size SSizeMB LV",
 * so the commands[] entry for the cmd def already references the
 * correct ssizemb_VAL.
 */
void configure_command_option_values(const char *name)
{
	if (!strcmp(name, "lvresize")) {
		/* relative +|- allowed for LV, + allowed for metadata */
		opt_names[size_ARG].val_enum = ssizemb_VAL;
		opt_names[extents_ARG].val_enum = sextents_VAL;
		opt_names[poolmetadatasize_ARG].val_enum = psizemb_VAL;
		return;
	}

	if (!strcmp(name, "lvextend")) {
		/* relative + allowed */
		opt_names[size_ARG].val_enum = psizemb_VAL;
		opt_names[extents_ARG].val_enum = pextents_VAL;
		opt_names[poolmetadatasize_ARG].val_enum = psizemb_VAL;
		return;
	}

	if (!strcmp(name, "lvreduce")) {
		/* relative - allowed */
		opt_names[size_ARG].val_enum = nsizemb_VAL;
		opt_names[extents_ARG].val_enum = nextents_VAL;
		return;
	}

	if (!strcmp(name, "lvconvert")) {
		opt_names[mirrors_ARG].val_enum = snumber_VAL;
		return;
	}

	if (!strcmp(name, "lvcreate")) {
		/*
		 * lvcreate is a bit of a mess because it has previously
		 * accepted + but used it as an absolute value, so we
		 * have to recognize it.  (We don't want to show the +
		 * option in man/help, though, since it's confusing,
		 * so there's a special case when printing man/help
		 * output to show sizemb_VAL/extents_VAL rather than
		 * psizemb_VAL/pextents_VAL.)
		 */
		opt_names[size_ARG].val_enum = psizemb_VAL;
		opt_names[extents_ARG].val_enum = pextents_VAL;
		opt_names[poolmetadatasize_ARG].val_enum = psizemb_VAL;
		opt_names[mirrors_ARG].val_enum = pnumber_VAL;
		return;
	}
}

/* type_LVT to "type" */

static void _print_usage_description(struct command *cmd)
{
	const char *desc = cmd->desc;
	char buf[MAX_LINE] = {0};
	unsigned di = 0;
	int bi = 0;

	for (di = 0; desc[di]; di++) {
		if (!strncmp(&desc[di], "DESC:", 5)) {
			if (bi) {
				buf[bi] = '\0';
				printf("  %s\n", buf);
				memset(buf, 0, sizeof(buf));
				bi = 0;
			}
			/* skip DESC: */
			di += 5;
			continue;
		}

		if (!bi && desc[di] == ' ')
			continue;

		if (desc[di] != '\\')
			buf[bi++] = desc[di];

		if (bi == (MAX_LINE - 1))
			break;
	}

	if (bi) {
		buf[bi] = '\0';
		printf("  %s\n", buf);
	}
}

static void _update_relative_opt(const char *name, int opt_enum, int *val_enum)
{
	/* check for relative sign */
	switch (opt_enum) {
	case extents_ARG:
	case mirrors_ARG:
	case poolmetadatasize_ARG:
	case size_ARG:
		/*
		 * Suppress the [+] prefix for lvcreate which we have to
		 * accept for backwards compat, but don't want to advertise.
		 */
		if (!strcmp(name, "lvcreate")) {
			switch (*val_enum) {
			case psizemb_VAL:
				*val_enum = sizemb_VAL;
				break;
			case pextents_VAL:
				*val_enum = extents_VAL;
				break;
			case pnumber_VAL:
				if (opt_enum == mirrors_ARG)
					*val_enum = number_VAL;
				break;
			}
		}
	}
}

static void _print_val_usage(struct command *cmd, int opt_enum, int val_enum)
{
	_update_relative_opt(cmd->name, opt_enum, &val_enum);

	if (!val_names[val_enum].usage)
		printf("%s", val_names[val_enum].name);
	else
		printf("%s", val_names[val_enum].usage);
}

static void _print_usage_def(struct command *cmd, int opt_enum, struct arg_def *def)
{
	int val_enum;
	int sep = 0;

	for (val_enum = 0; val_enum < VAL_COUNT; val_enum++) {
		if (def->val_bits & val_enum_to_bit(val_enum)) {

			if (val_enum == conststr_VAL)
				printf("%s", def->str);

			else if (val_enum == constnum_VAL)
				printf("%llu", (unsigned long long)def->num);

			else {
				if (sep) printf("|");
				_print_val_usage(cmd, opt_enum, val_enum);
				sep = 1;
			}

			/* Too many types have made this too long.  man page has this info. */
			/*
			if (val_enum == lv_VAL && def->lvt_bits) {
				int lvt_enum;
				for (lvt_enum = 1; lvt_enum < LVT_COUNT; lvt_enum++) {
					if (lvt_bit_is_set(def->lvt_bits, lvt_enum))
						printf("_%s", _lvt_enum_to_name(lvt_enum));
				}
			}
			*/

			if ((val_enum == vg_VAL) && (def->flags & ARG_DEF_FLAG_NEW_VG))
				printf("_new");
			if ((val_enum == lv_VAL) && (def->flags & ARG_DEF_FLAG_NEW_LV))
				printf("_new");
		}
	}

	if (def->flags & ARG_DEF_FLAG_MAY_REPEAT)
		printf(" ...");
}

void print_usage(struct command *cmd, int longhelp, int desc_first)
{
	struct command_name *cname = _find_command_name(cmd->name);
	int any_req = (cmd->cmd_flags & CMD_FLAG_ANY_REQUIRED_OPT) ? 1 : 0;
	int include_extents = 0;
	int ro, rp, oo, op, opt_enum, first;

	/*
	 * Looks at all variants of each command name and figures out
	 * which options are common to all variants (for compact output)
	 */
	factor_common_options();

	if (desc_first && cmd->desc)
		_print_usage_description(cmd);

	printf("  %s", cmd->name);

	if (any_req) {
		for (ro = 0; ro < cmd->ro_count; ro++) {
			opt_enum = cmd->required_opt_args[ro].opt;

			if (opt_names[opt_enum].short_opt)
				printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);
			else
				printf(" %s", opt_names[opt_enum].long_opt);

			if (cmd->required_opt_args[ro].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->required_opt_args[ro].def);
			}
		}

		/* one required option in a set */
		first = 1;

		/* options with short and long */
		for (ro = cmd->ro_count; ro < cmd->ro_count + cmd->any_ro_count; ro++) {
			opt_enum = cmd->required_opt_args[ro].opt;

			if (!opt_names[opt_enum].short_opt)
				continue;

			if (first)
				printf("\n\t(");
			else
				printf(",\n\t ");
			first = 0;

			printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);

			if (cmd->required_opt_args[ro].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->required_opt_args[ro].def);
			}
		}

		/* options with only long */
		for (ro = cmd->ro_count; ro < cmd->ro_count + cmd->any_ro_count; ro++) {
			opt_enum = cmd->required_opt_args[ro].opt;

			if (opt_names[opt_enum].short_opt)
				continue;

			if ((opt_enum == size_ARG) && command_has_alternate_extents(cmd->name))
				include_extents = 1;

			if (first)
				printf("\n\t(");
			else
				printf(",\n\t ");
			first = 0;

			printf("    %s", opt_names[opt_enum].long_opt);

			if (cmd->required_opt_args[ro].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->required_opt_args[ro].def);
			}
		}

		printf_hyphen(')');
	} else  /* !any_req */
		for (ro = 0; ro < cmd->ro_count; ro++) {
			opt_enum = cmd->required_opt_args[ro].opt;

			if ((opt_enum == size_ARG) && command_has_alternate_extents(cmd->name))
				include_extents = 1;

			if (opt_names[opt_enum].short_opt)
				printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);
			else
				printf(" %s", opt_names[opt_enum].long_opt);

			if (cmd->required_opt_args[ro].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->required_opt_args[ro].def);
			}
		}

	if (cmd->rp_count) {
		if (any_req)
			printf("\t");
		for (rp = 0; rp < cmd->rp_count; rp++) {
			if (cmd->required_pos_args[rp].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, 0, &cmd->required_pos_args[rp].def);
			}
		}
	}

	if (!longhelp)
		goto done;

	if (cmd->oo_count) {
		if (cmd->autotype) {
			printf("\n\t");
			if (!cmd->autotype2)
				printf("[ --type %s ] (implied)", cmd->autotype);
			else
				printf("[ --type %s|%s ] (implied)", cmd->autotype, cmd->autotype2);
		}

		if (include_extents) {
			printf("\n\t[ -l|--extents ");
			_print_val_usage(cmd, extents_ARG, opt_names[extents_ARG].val_enum);
			printf(" ]");
		}

		/* print optional options with short opts */

		for (oo = 0; oo < cmd->oo_count; oo++) {
			opt_enum = cmd->optional_opt_args[oo].opt;

			if (!opt_names[opt_enum].short_opt)
				continue;

			/*
			 * Skip common lvm options in lvm_all which
			 * are printed at the end under "Common options for lvm"
			 * see print_common_options_lvm()
			 */

			if (_is_lvm_all_opt(opt_enum))
				continue;

			/*
			 * When there is more than one variant,
			 * skip common command options from
			 * cname->common_options (options common
			 * to all variants), which are printed at
			 * the end under "Common options for command"
			 * see print_common_options_cmd()
			 */

			if (cname && (cname->variants > 1) && cname->common_options[opt_enum])
				continue;

			printf("\n\t[");

			printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);
			if (cmd->optional_opt_args[oo].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->optional_opt_args[oo].def);
			}

			printf(" ]");
		}

		/* print optional options without short opts */

		for (oo = 0; oo < cmd->oo_count; oo++) {
			opt_enum = cmd->optional_opt_args[oo].opt;

			if (opt_names[opt_enum].short_opt)
				continue;

			/*
			 * Skip common lvm options in lvm_all which
			 * are printed at the end under "Common options for lvm"
			 * see print_common_options_lvm()
			 */

			if (_is_lvm_all_opt(opt_enum))
				continue;

			/*
			 * When there is more than one variant,
			 * skip common command options from
			 * cname->common_options (options common
			 * to all variants), which are printed at
			 * the end under "Common options for command"
			 * see print_common_options_cmd()
			 */

			if (cname && (cname->variants > 1) && cname->common_options[opt_enum])
				continue;

			printf("\n\t[");

			printf("    %s", opt_names[opt_enum].long_opt);
			if (cmd->optional_opt_args[oo].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->optional_opt_args[oo].def);
			}

			printf(" ]");
		}

		printf("\n\t[ COMMON_OPTIONS ]");
	}

	if (cmd->op_count) {
		printf("\n\t[");

		for (op = 0; op < cmd->op_count; op++)
			if (cmd->optional_pos_args[op].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, 0, &cmd->optional_pos_args[op].def);
			}

		printf(" ]");
	}
 done:
	printf("\n");

	if (!desc_first && cmd->desc)
		_print_usage_description(cmd);

	printf("\n");
}

void print_usage_common_lvm(struct command_name *cname, struct command *cmd)
{
	int oo, opt_enum;

	printf("  Common options for lvm:");

	/* print options with short opts */

	for (oo = 0; oo < lvm_all.oo_count; oo++) {
		opt_enum = lvm_all.optional_opt_args[oo].opt;

		if (!opt_names[opt_enum].short_opt)
			continue;

		printf("\n\t[");

		printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);
		if (lvm_all.optional_opt_args[oo].def.val_bits) {
			printf(" ");
			_print_usage_def(cmd, opt_enum, &lvm_all.optional_opt_args[oo].def);
		}
		printf(" ]");
	}

	/* print options without short opts */

	for (oo = 0; oo < lvm_all.oo_count; oo++) {
		opt_enum = lvm_all.optional_opt_args[oo].opt;

		if (opt_names[opt_enum].short_opt)
			continue;

		printf("\n\t[");

		printf("    %s", opt_names[opt_enum].long_opt);
		if (lvm_all.optional_opt_args[oo].def.val_bits) {
			printf(" ");
			_print_usage_def(cmd, opt_enum, &lvm_all.optional_opt_args[oo].def);
		}
		printf(" ]");
	}

	printf("\n\n");
}

void print_usage_common_cmd(struct command_name *cname, struct command *cmd)
{
	int oo, opt_enum;
	int found_common_command = 0;

	/*
	 * when there's more than one variant, options that
	 * are common to all commands with a common name.
	 */

	if (cname->variants < 2)
		return;

	for (opt_enum = 0; opt_enum < ARG_COUNT; opt_enum++) {
		if (!cname->common_options[opt_enum])
			continue;
		if (_is_lvm_all_opt(opt_enum))
			continue;
		found_common_command = 1;
		break;
	}

	if (!found_common_command)
		return;

	printf("  Common options for command:");

	/* print options with short opts */

	for (opt_enum = 0; opt_enum < ARG_COUNT; opt_enum++) {
		if (!cname->common_options[opt_enum])
			continue;

		if (_is_lvm_all_opt(opt_enum))
			continue;

		if (!opt_names[opt_enum].short_opt)
			continue;

		printf("\n\t[");

		for (oo = 0; oo < cmd->oo_count; oo++) {
			if (cmd->optional_opt_args[oo].opt != opt_enum)
				continue;

			printf(" -%c|%s", opt_names[opt_enum].short_opt, opt_names[opt_enum].long_opt);
			if (cmd->optional_opt_args[oo].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->optional_opt_args[oo].def);
			}
			break;
		}
		printf(" ]");
	}

	/* print options without short opts */

	for (opt_enum = 0; opt_enum < ARG_COUNT; opt_enum++) {
		if (!cname->common_options[opt_enum])
			continue;

		if (_is_lvm_all_opt(opt_enum))
			continue;

		if (opt_names[opt_enum].short_opt)
			continue;

		printf("\n\t[");

		for (oo = 0; oo < cmd->oo_count; oo++) {
			if (cmd->optional_opt_args[oo].opt != opt_enum)
				continue;

			printf("    %s", opt_names[opt_enum].long_opt);
			if (cmd->optional_opt_args[oo].def.val_bits) {
				printf(" ");
				_print_usage_def(cmd, opt_enum, &cmd->optional_opt_args[oo].def);
			}
			break;
		}
		printf(" ]");
	}

	printf("\n\n");
}

void print_usage_notes(struct command_name *cname)
{
	if (cname && command_has_alternate_extents(cname->name)) {
		printf("  Special options for command:\n");
		printf("        [ --extents Number[PERCENT] ]\n"
		       "        The --extents option can be used in place of --size.\n"
		       "        The number allows an optional percent suffix.\n");
		printf("\n");
	}

	if (cname && !strcmp(cname->name, "lvcreate")) {
		printf("        [ --name String ]\n"
		       "        The --name option is not required but is typically used.\n"
		       "        When a name is not specified, a new LV name is generated\n"
		       "        with the \"lvol\" prefix and a unique numeric suffix.\n");
		printf("\n");
	}

	printf("  Common variables for lvm:\n"
	       "        Variables in option or position args are capitalized,\n"
	       "        e.g. PV, VG, LV, Size, Number, String, Tag.\n");
	printf("\n");

	printf("        PV\n"
	       "        Physical Volume name, a device path under /dev.\n"
	       "        For commands managing physical extents, a PV positional arg\n"
	       "        generally accepts a suffix indicating a range (or multiple ranges)\n"
	       "        of PEs. When the first PE is omitted, it defaults to the start of\n"
	       "        the device, and when the last PE is omitted it defaults to the end.\n"
	       "        PV[:PE-PE]... is start and end range (inclusive),\n"
	       "        PV[:PE+PE]... is start and length range (counting from 0).\n");
	printf("\n");

	printf("        LV\n"
	       "        Logical Volume name. See lvm(8) for valid names. An LV positional\n"
	       "        arg generally includes the VG name and LV name, e.g. VG/LV.\n"
	       "        LV followed by _<type> indicates that an LV of the given type is\n"
	       "        required. (raid represents raid<N> type).\n"
	       "        The _new suffix indicates that the LV name is new.\n");
	printf("\n");

	printf("        Tag\n"
	       "        Tag name. See lvm(8) for information about tag names and using\n"
	       "        tags in place of a VG, LV or PV.\n");
	printf("\n");

	printf("        Select\n"
	       "        Select indicates that a required positional arg can be omitted\n"
	       "        if the --select option is used. No arg appears in this position.\n");
	printf("\n");

	printf("        Size[UNIT]\n"
	       "        Size is an input number that accepts an optional unit.\n"
               "        Input units are always treated as base two values, regardless of\n"
               "        capitalization, e.g. 'k' and 'K' both refer to 1024.\n"
               "        The default input unit is specified by letter, followed by |UNIT.\n"
               "        UNIT represents other possible input units: BbBsSkKmMgGtTpPeE.\n"
               "        (This should not be confused with the output control --units, where\n"
               "        capital letters mean multiple of 1000.)\n");
	printf("\n");
}