cmd-generic.c - tmux - Rivoreo Source Code Repositories

 /* $OpenBSD$ */

 /*
  * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <sys/types.h>

 #include <stdlib.h>
 #include <string.h>

 #include "tmux.h"

 int	cmd_getopt(int, char **, const char *, uint64_t);
 int	cmd_flags(int, uint64_t, uint64_t *);
 size_t	cmd_print_flags(char *, size_t, size_t, uint64_t);
 int	cmd_fill_argument(int, char **, int, char **);

 size_t
 cmd_prarg(char *buf, size_t len, const char *prefix, char *arg)
 {
 	if (strchr(arg, ' ') != NULL)
 		return (xsnprintf(buf, len, "%s\"%s\"", prefix, arg));
 	return (xsnprintf(buf, len, "%s%s", prefix, arg));
 }

 /* Prepend flags from chflags onto flagstr and call getopt. */
 int
 cmd_getopt(int argc, char **argv, const char *flagstr, uint64_t chflags)
 {
 	u_char	ch;
 	char	buf[128];
 	size_t	len, off;

 	*buf = '\0';

 	len = sizeof buf;
 	off = 0;

 	for (ch = 0; ch < 26; ch++) {
 		if (chflags & CMD_CHFLAG('a' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
 		if (chflags & CMD_CHFLAG('A' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
 	}

 	strlcat(buf, flagstr, sizeof buf);

 	return (getopt(argc, argv, buf));
 }

 /*
  * If this option is expected (in ichflags), set it in ochflags, otherwise
  * return -1.
  */
 int
 cmd_flags(int opt, uint64_t ichflags, uint64_t *ochflags)
 {
 	u_char	ch;

 	for (ch = 0; ch < 26; ch++) {
 		if (opt == 'a' + ch && ichflags & CMD_CHFLAG(opt)) {
 			(*ochflags) |= CMD_CHFLAG(opt);
 			return (0);
 		}
 		if (opt == 'A' + ch && ichflags & CMD_CHFLAG(opt)) {
 			(*ochflags) |= CMD_CHFLAG(opt);
 			return (0);
 		}
 	}
 	return (-1);
 }

 /* Print the flags supported in chflags. */
 size_t
 cmd_print_flags(char *buf, size_t len, size_t off, uint64_t chflags)
 {
 	u_char	ch;
 	size_t	boff = off;

 	if (chflags == 0)
 		return (0);
 	off += xsnprintf(buf + off, len - off, " -");

 	for (ch = 0; ch < 26; ch++) {
 		if (chflags & CMD_CHFLAG('a' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
 		if (chflags & CMD_CHFLAG('A' + ch))
 			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
 	}
 	return (off - boff);
 }

 int
 cmd_fill_argument(int flags, char **arg, int argc, char **argv)
 {
 	*arg = NULL;

 	if (flags & CMD_ARG1) {
 		if (argc != 1)
 			return (-1);
 		*arg = xstrdup(argv[0]);
 		return (0);
 	}

 	if (flags & CMD_ARG01) {
 		if (argc != 0 && argc != 1)
 			return (-1);
 		if (argc == 1)
 			*arg = xstrdup(argv[0]);
 		return (0);
 	}

 	if (argc != 0)
 		return (-1);
 	return (0);
 }

 void
 cmd_target_init(struct cmd *self, unused int key)
 {
 	struct cmd_target_data	*data;

 	self->data = data = xmalloc(sizeof *data);
 	data->chflags = 0;
 	data->target = NULL;
 	data->arg = NULL;
 }

 int
 cmd_target_parse(struct cmd *self, int argc, char **argv, char **cause)
 {
 	struct cmd_target_data	*data;
 	const struct cmd_entry	*entry = self->entry;
 	int			 opt;

 	/* Don't use the entry version since it may be dependent on key. */
 	cmd_target_init(self, 0);
 	data = self->data;

 	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
 		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 't':
 			if (data->target == NULL)
 				data->target = xstrdup(optarg);
 			break;
 		default:
 			goto usage;
 		}
 	}
 	argc -= optind;
 	argv += optind;

 	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
 		goto usage;
 	return (0);

 usage:
 	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

 	self->entry->free(self);
 	return (-1);
 }

 void
 cmd_target_free(struct cmd *self)
 {
 	struct cmd_target_data	*data = self->data;

 	if (data->target != NULL)
 		xfree(data->target);
 	if (data->arg != NULL)
 		xfree(data->arg);
 	xfree(data);
 }

 size_t
 cmd_target_print(struct cmd *self, char *buf, size_t len)
 {
 	struct cmd_target_data	*data = self->data;
 	size_t			 off = 0;

 	off += xsnprintf(buf, len, "%s", self->entry->name);
 	if (data == NULL)
 		return (off);
 	off += cmd_print_flags(buf, len, off, data->chflags);
 	if (off < len && data->target != NULL)
 		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
  	if (off < len && data->arg != NULL)
 		off += cmd_prarg(buf + off, len - off, " ", data->arg);
 	return (off);
 }

 void
 cmd_srcdst_init(struct cmd *self, unused int key)
 {
 	struct cmd_srcdst_data	*data;

 	self->data = data = xmalloc(sizeof *data);
 	data->chflags = 0;
 	data->src = NULL;
 	data->dst = NULL;
 	data->arg = NULL;
 }

 int
 cmd_srcdst_parse(struct cmd *self, int argc, char **argv, char **cause)
 {
 	struct cmd_srcdst_data	*data;
 	const struct cmd_entry	*entry = self->entry;
 	int			 opt;

 	cmd_srcdst_init(self, 0);
 	data = self->data;

 	while ((opt = cmd_getopt(argc, argv, "s:t:", entry->chflags)) != -1) {
 		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 's':
 			if (data->src == NULL)
 				data->src = xstrdup(optarg);
 			break;
 		case 't':
 			if (data->dst == NULL)
 				data->dst = xstrdup(optarg);
 			break;
 		default:
 			goto usage;
 		}
 	}
 	argc -= optind;
 	argv += optind;

 	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
 		goto usage;
 	return (0);

 usage:
 	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

 	self->entry->free(self);
 	return (-1);
 }

 void
 cmd_srcdst_free(struct cmd *self)
 {
 	struct cmd_srcdst_data	*data = self->data;

 	if (data->src != NULL)
 		xfree(data->src);
 	if (data->dst != NULL)
 		xfree(data->dst);
 	if (data->arg != NULL)
 		xfree(data->arg);
 	xfree(data);
 }

 size_t
 cmd_srcdst_print(struct cmd *self, char *buf, size_t len)
 {
 	struct cmd_srcdst_data	*data = self->data;
 	size_t			 off = 0;

 	off += xsnprintf(buf, len, "%s", self->entry->name);
 	if (data == NULL)
 		return (off);
 	off += cmd_print_flags(buf, len, off, data->chflags);
 	if (off < len && data->src != NULL)
 		off += xsnprintf(buf + off, len - off, " -s %s", data->src);
 	if (off < len && data->dst != NULL)
 		off += xsnprintf(buf + off, len - off, " -t %s", data->dst);
  	if (off < len && data->arg != NULL)
 		off += cmd_prarg(buf + off, len - off, " ", data->arg);
 	return (off);
 }

 void
 cmd_buffer_init(struct cmd *self, unused int key)
 {
 	struct cmd_buffer_data	*data;

 	self->data = data = xmalloc(sizeof *data);
 	data->chflags = 0;
 	data->target = NULL;
 	data->buffer = -1;
 	data->arg = NULL;
 }

 int
 cmd_buffer_parse(struct cmd *self, int argc, char **argv, char **cause)
 {
 	struct cmd_buffer_data	*data;
 	const struct cmd_entry	*entry = self->entry;
 	int			 opt, n;
 	const char		*errstr;

 	cmd_buffer_init(self, 0);
 	data = self->data;

 	while ((opt = cmd_getopt(argc, argv, "b:t:", entry->chflags)) != -1) {
 		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 'b':
 			if (data->buffer == -1) {
 				n = strtonum(optarg, 0, INT_MAX, &errstr);
 				if (errstr != NULL) {
 					xasprintf(cause, "buffer %s", errstr);
 					goto error;
 				}
 				data->buffer = n;
 			}
 			break;
 		case 't':
 			if (data->target == NULL)
 				data->target = xstrdup(optarg);
 			break;
 		default:
 			goto usage;
 		}
 	}
 	argc -= optind;
 	argv += optind;

 	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
 		goto usage;
 	return (0);

 usage:
 	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

 error:
 	self->entry->free(self);
 	return (-1);
 }

 void
 cmd_buffer_free(struct cmd *self)
 {
 	struct cmd_buffer_data	*data = self->data;

 	if (data->target != NULL)
 		xfree(data->target);
 	if (data->arg != NULL)
 		xfree(data->arg);
 	xfree(data);
 }

 size_t
 cmd_buffer_print(struct cmd *self, char *buf, size_t len)
 {
 	struct cmd_buffer_data	*data = self->data;
 	size_t			 off = 0;

 	off += xsnprintf(buf, len, "%s", self->entry->name);
 	if (data == NULL)
 		return (off);
 	off += cmd_print_flags(buf, len, off, data->chflags);
 	if (off < len && data->buffer != -1)
 		off += xsnprintf(buf + off, len - off, " -b %d", data->buffer);
 	if (off < len && data->target != NULL)
 		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
  	if (off < len && data->arg != NULL)
 		off += cmd_prarg(buf + off, len - off, " ", data->arg);
 	return (off);
 }

 void
 cmd_option_init(struct cmd *self, unused int key)
 {
 	struct cmd_option_data	*data;

 	self->data = data = xmalloc(sizeof *data);
 	data->chflags = 0;
 	data->target = NULL;
 	data->option = NULL;
 	data->value = NULL;
 }

 int
 cmd_option_parse(struct cmd *self, int argc, char **argv, char **cause)
 {
 	struct cmd_option_data	*data;
 	const struct cmd_entry	*entry = self->entry;
 	int			 opt;

 	/* Don't use the entry version since it may be dependent on key. */
 	cmd_option_init(self, 0);
 	data = self->data;

 	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
 		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
 			continue;
 		switch (opt) {
 		case 't':
 			if (data->target == NULL)
 				data->target = xstrdup(optarg);
 			break;
 		default:
 			goto usage;
 		}
 	}
 	argc -= optind;
 	argv += optind;

 	if (argc == 2) {
 		data->option = xstrdup(argv[0]);
 		data->value = xstrdup(argv[1]);
 	} else if (argc == 1)
 		data->option = xstrdup(argv[0]);
 	else
 		goto usage;
 	return (0);

 usage:
 	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

 	self->entry->free(self);
 	return (-1);
 }

 void
 cmd_option_free(struct cmd *self)
 {
 	struct cmd_option_data	*data = self->data;

 	if (data->target != NULL)
 		xfree(data->target);
 	if (data->option != NULL)
 		xfree(data->option);
 	if (data->value != NULL)
 		xfree(data->value);
 	xfree(data);
 }

 size_t
 cmd_option_print(struct cmd *self, char *buf, size_t len)
 {
 	struct cmd_option_data	*data = self->data;
 	size_t			 off = 0;

 	off += xsnprintf(buf, len, "%s", self->entry->name);
 	if (data == NULL)
 		return (off);
 	off += cmd_print_flags(buf, len, off, data->chflags);
 	if (off < len && data->target != NULL)
 		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
  	if (off < len && data->option != NULL)
 		off += xsnprintf(buf + off, len - off, " %s", data->option);
  	if (off < len && data->value != NULL)
 		off += xsnprintf(buf + off, len - off, " %s", data->value);
 	return (off);
 }
	/* $OpenBSD$ */

	/*
	* Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
	*
	* Permission to use, copy, modify, and distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
	* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
	* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <sys/types.h>

	#include <stdlib.h>
	#include <string.h>

	#include "tmux.h"

	int cmd_getopt(int, char *, const char , uint64_t);
	int cmd_flags(int, uint64_t, uint64_t *);
	size_t cmd_print_flags(char *, size_t, size_t, uint64_t);
	int cmd_fill_argument(int, char , int, char );

	size_t
	cmd_prarg(char buf, size_t len, const char prefix, char *arg)
	{
	if (strchr(arg, ' ') != NULL)
	return (xsnprintf(buf, len, "%s\"%s\"", prefix, arg));
	return (xsnprintf(buf, len, "%s%s", prefix, arg));
	}

	/* Prepend flags from chflags onto flagstr and call getopt. */
	int
	cmd_getopt(int argc, char *argv, const char flagstr, uint64_t chflags)
	{
	u_char ch;
	char buf[128];
	size_t len, off;

	*buf = '\0';

	len = sizeof buf;
	off = 0;

	for (ch = 0; ch < 26; ch++) {
	if (chflags & CMD_CHFLAG('a' + ch))
	off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
	if (chflags & CMD_CHFLAG('A' + ch))
	off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
	}

	strlcat(buf, flagstr, sizeof buf);

	return (getopt(argc, argv, buf));
	}

	/*
	* If this option is expected (in ichflags), set it in ochflags, otherwise
	* return -1.
	*/
	int
	cmd_flags(int opt, uint64_t ichflags, uint64_t *ochflags)
	{
	u_char ch;

	for (ch = 0; ch < 26; ch++) {
	if (opt == 'a' + ch && ichflags & CMD_CHFLAG(opt)) {
	(*ochflags) \|= CMD_CHFLAG(opt);
	return (0);
	}
	if (opt == 'A' + ch && ichflags & CMD_CHFLAG(opt)) {
	(*ochflags) \|= CMD_CHFLAG(opt);
	return (0);
	}
	}
	return (-1);
	}

	/* Print the flags supported in chflags. */
	size_t
	cmd_print_flags(char *buf, size_t len, size_t off, uint64_t chflags)
	{
	u_char ch;
	size_t boff = off;

	if (chflags == 0)
	return (0);
	off += xsnprintf(buf + off, len - off, " -");

	for (ch = 0; ch < 26; ch++) {
	if (chflags & CMD_CHFLAG('a' + ch))
	off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
	if (chflags & CMD_CHFLAG('A' + ch))
	off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
	}
	return (off - boff);
	}

	int
	cmd_fill_argument(int flags, char arg, int argc, char argv)
	{
	*arg = NULL;

	if (flags & CMD_ARG1) {
	if (argc != 1)
	return (-1);
	*arg = xstrdup(argv[0]);
	return (0);
	}

	if (flags & CMD_ARG01) {
	if (argc != 0 && argc != 1)
	return (-1);
	if (argc == 1)
	*arg = xstrdup(argv[0]);
	return (0);
	}

	if (argc != 0)
	return (-1);
	return (0);
	}

	void
	cmd_target_init(struct cmd *self, unused int key)
	{
	struct cmd_target_data *data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->arg = NULL;
	}

	int
	cmd_target_parse(struct cmd self, int argc, char argv, char *cause)
	{
	struct cmd_target_data *data;
	const struct cmd_entry *entry = self->entry;
	int opt;

	/* Don't use the entry version since it may be dependent on key. */
	cmd_target_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
	if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
	continue;
	switch (opt) {
	case 't':
	if (data->target == NULL)
	data->target = xstrdup(optarg);
	break;
	default:
	goto usage;
	}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
	goto usage;
	return (0);

	usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
	}

	void
	cmd_target_free(struct cmd *self)
	{
	struct cmd_target_data *data = self->data;

	if (data->target != NULL)
	xfree(data->target);
	if (data->arg != NULL)
	xfree(data->arg);
	xfree(data);
	}

	size_t
	cmd_target_print(struct cmd self, char buf, size_t len)
	{
	struct cmd_target_data *data = self->data;
	size_t off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
	return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->target != NULL)
	off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->arg != NULL)
	off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
	}

	void
	cmd_srcdst_init(struct cmd *self, unused int key)
	{
	struct cmd_srcdst_data *data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->src = NULL;
	data->dst = NULL;
	data->arg = NULL;
	}

	int
	cmd_srcdst_parse(struct cmd self, int argc, char argv, char *cause)
	{
	struct cmd_srcdst_data *data;
	const struct cmd_entry *entry = self->entry;
	int opt;

	cmd_srcdst_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "s:t:", entry->chflags)) != -1) {
	if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
	continue;
	switch (opt) {
	case 's':
	if (data->src == NULL)
	data->src = xstrdup(optarg);
	break;
	case 't':
	if (data->dst == NULL)
	data->dst = xstrdup(optarg);
	break;
	default:
	goto usage;
	}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
	goto usage;
	return (0);

	usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
	}

	void
	cmd_srcdst_free(struct cmd *self)
	{
	struct cmd_srcdst_data *data = self->data;

	if (data->src != NULL)
	xfree(data->src);
	if (data->dst != NULL)
	xfree(data->dst);
	if (data->arg != NULL)
	xfree(data->arg);
	xfree(data);
	}

	size_t
	cmd_srcdst_print(struct cmd self, char buf, size_t len)
	{
	struct cmd_srcdst_data *data = self->data;
	size_t off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
	return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->src != NULL)
	off += xsnprintf(buf + off, len - off, " -s %s", data->src);
	if (off < len && data->dst != NULL)
	off += xsnprintf(buf + off, len - off, " -t %s", data->dst);
	if (off < len && data->arg != NULL)
	off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
	}

	void
	cmd_buffer_init(struct cmd *self, unused int key)
	{
	struct cmd_buffer_data *data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->buffer = -1;
	data->arg = NULL;
	}

	int
	cmd_buffer_parse(struct cmd self, int argc, char argv, char *cause)
	{
	struct cmd_buffer_data *data;
	const struct cmd_entry *entry = self->entry;
	int opt, n;
	const char *errstr;

	cmd_buffer_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "b:t:", entry->chflags)) != -1) {
	if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
	continue;
	switch (opt) {
	case 'b':
	if (data->buffer == -1) {
	n = strtonum(optarg, 0, INT_MAX, &errstr);
	if (errstr != NULL) {
	xasprintf(cause, "buffer %s", errstr);
	goto error;
	}
	data->buffer = n;
	}
	break;
	case 't':
	if (data->target == NULL)
	data->target = xstrdup(optarg);
	break;
	default:
	goto usage;
	}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
	goto usage;
	return (0);

	usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	error:
	self->entry->free(self);
	return (-1);
	}

	void
	cmd_buffer_free(struct cmd *self)
	{
	struct cmd_buffer_data *data = self->data;

	if (data->target != NULL)
	xfree(data->target);
	if (data->arg != NULL)
	xfree(data->arg);
	xfree(data);
	}

	size_t
	cmd_buffer_print(struct cmd self, char buf, size_t len)
	{
	struct cmd_buffer_data *data = self->data;
	size_t off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
	return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->buffer != -1)
	off += xsnprintf(buf + off, len - off, " -b %d", data->buffer);
	if (off < len && data->target != NULL)
	off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->arg != NULL)
	off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
	}

	void
	cmd_option_init(struct cmd *self, unused int key)
	{
	struct cmd_option_data *data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->option = NULL;
	data->value = NULL;
	}

	int
	cmd_option_parse(struct cmd self, int argc, char argv, char *cause)
	{
	struct cmd_option_data *data;
	const struct cmd_entry *entry = self->entry;
	int opt;

	/* Don't use the entry version since it may be dependent on key. */
	cmd_option_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
	if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
	continue;
	switch (opt) {
	case 't':
	if (data->target == NULL)
	data->target = xstrdup(optarg);
	break;
	default:
	goto usage;
	}
	}
	argc -= optind;
	argv += optind;

	if (argc == 2) {
	data->option = xstrdup(argv[0]);
	data->value = xstrdup(argv[1]);
	} else if (argc == 1)
	data->option = xstrdup(argv[0]);
	else
	goto usage;
	return (0);

	usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
	}

	void
	cmd_option_free(struct cmd *self)
	{
	struct cmd_option_data *data = self->data;

	if (data->target != NULL)
	xfree(data->target);
	if (data->option != NULL)
	xfree(data->option);
	if (data->value != NULL)
	xfree(data->value);
	xfree(data);
	}

	size_t
	cmd_option_print(struct cmd self, char buf, size_t len)
	{
	struct cmd_option_data *data = self->data;
	size_t off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
	return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->target != NULL)
	off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->option != NULL)
	off += xsnprintf(buf + off, len - off, " %s", data->option);
	if (off < len && data->value != NULL)
	off += xsnprintf(buf + off, len - off, " %s", data->value);
	return (off);
	}