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Return -1 not NULL on error, pointed out by Roy Marples.

/* $OpenBSD: cmd.c,v 1.6 2009/07/15 15:09:17 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <sys/time.h>

#include <fnmatch.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

const struct cmd_entry *cmd_table[] = {
	&cmd_attach_session_entry,
	&cmd_bind_key_entry,
	&cmd_break_pane_entry,
	&cmd_choose_session_entry,
	&cmd_choose_window_entry,
	&cmd_clear_history_entry,
	&cmd_clock_mode_entry,
	&cmd_command_prompt_entry,
	&cmd_confirm_before_entry,
	&cmd_copy_buffer_entry,
	&cmd_copy_mode_entry,
	&cmd_delete_buffer_entry,
	&cmd_detach_client_entry,
	&cmd_down_pane_entry,
	&cmd_find_window_entry,
	&cmd_has_session_entry,
	&cmd_if_shell_entry,
	&cmd_kill_pane_entry,
	&cmd_kill_server_entry,
	&cmd_kill_session_entry,
	&cmd_kill_window_entry,
	&cmd_last_window_entry,
	&cmd_link_window_entry,
	&cmd_list_buffers_entry,
	&cmd_list_clients_entry,
	&cmd_list_commands_entry,
	&cmd_list_keys_entry,
	&cmd_list_sessions_entry,
	&cmd_list_windows_entry,
	&cmd_load_buffer_entry,
	&cmd_lock_server_entry,
	&cmd_move_window_entry,
	&cmd_new_session_entry,
	&cmd_new_window_entry,
	&cmd_next_layout_entry,
	&cmd_next_window_entry,
	&cmd_paste_buffer_entry,
	&cmd_previous_layout_entry,
	&cmd_previous_window_entry,
	&cmd_refresh_client_entry,
	&cmd_rename_session_entry,
	&cmd_rename_window_entry,
	&cmd_resize_pane_entry,
	&cmd_respawn_window_entry,
	&cmd_rotate_window_entry,
	&cmd_save_buffer_entry,
	&cmd_scroll_mode_entry,
	&cmd_select_layout_entry,
	&cmd_select_pane_entry,
	&cmd_select_prompt_entry,
	&cmd_select_window_entry,
	&cmd_send_keys_entry,
	&cmd_send_prefix_entry,
	&cmd_server_info_entry,
	&cmd_set_buffer_entry,
	&cmd_set_option_entry,
	&cmd_set_password_entry,
	&cmd_set_window_option_entry,
	&cmd_show_buffer_entry,
	&cmd_show_options_entry,
	&cmd_show_window_options_entry,
	&cmd_source_file_entry,
	&cmd_split_window_entry,
	&cmd_start_server_entry,
	&cmd_suspend_client_entry,
	&cmd_swap_pane_entry,
	&cmd_swap_window_entry,
	&cmd_switch_client_entry,
	&cmd_unbind_key_entry,
	&cmd_unlink_window_entry,
	&cmd_up_pane_entry,
	NULL
};

struct session	*cmd_newest_session(void);
struct client	*cmd_lookup_client(const char *);
struct session	*cmd_lookup_session(const char *, int *);
struct winlink	*cmd_lookup_window(struct session *, const char *, int *);

struct cmd *
cmd_parse(int argc, char **argv, char **cause)
{
	const struct cmd_entry **entryp, *entry;
	struct cmd	        *cmd;
	char			 s[BUFSIZ];
	int			 opt, ambiguous = 0;

	*cause = NULL;
	if (argc == 0) {
		xasprintf(cause, "no command");
		return (NULL);
	}

	entry = NULL;
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if ((*entryp)->alias != NULL &&
		    strcmp((*entryp)->alias, argv[0]) == 0) {
			ambiguous = 0;
			entry = *entryp;
			break;
		}

		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
			continue;
		if (entry != NULL)
			ambiguous = 1;
		entry = *entryp;

		/* Bail now if an exact match. */
		if (strcmp(entry->name, argv[0]) == 0)
			break;
	}
	if (ambiguous)
		goto ambiguous;
	if (entry == NULL) {
		xasprintf(cause, "unknown command: %s", argv[0]);
		return (NULL);
	}

	optreset = 1;
	optind = 1;
	if (entry->parse == NULL) {
		while ((opt = getopt(argc, argv, "")) != -1) {
			switch (opt) {
			default:
				goto usage;
			}
		}
		argc -= optind;
		argv += optind;
		if (argc != 0)
			goto usage;
	}

	cmd = xmalloc(sizeof *cmd);
	cmd->entry = entry;
	cmd->data = NULL;
	if (entry->parse != NULL) {
		if (entry->parse(cmd, argc, argv, cause) != 0) {
			xfree(cmd);
			return (NULL);
		}
	}
	return (cmd);

ambiguous:
	*s = '\0';
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
			continue;
		if (strlcat(s, (*entryp)->name, sizeof s) >= sizeof s)
			break;
		if (strlcat(s, ", ", sizeof s) >= sizeof s)
			break;
	}
	s[strlen(s) - 2] = '\0';
	xasprintf(cause, "ambiguous command: %s, could be: %s", argv[0], s);
	return (NULL);

usage:
	xasprintf(cause, "usage: %s %s", entry->name, entry->usage);
	return (NULL);
}

int
cmd_exec(struct cmd *cmd, struct cmd_ctx *ctx)
{
	if (server_locked) {
		ctx->error(ctx, "server is locked");
		return (-1);
	}
	return (cmd->entry->exec(cmd, ctx));
}

void
cmd_send(struct cmd *cmd, struct buffer *b)
{
	const struct cmd_entry **entryp;
	u_int			 n;

	n = 0;
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if (*entryp == cmd->entry)
			break;
		n++;
	}
	if (*entryp == NULL)
		fatalx("command not found");

	buffer_write(b, &n, sizeof n);

	if (cmd->entry->send != NULL)
		cmd->entry->send(cmd, b);
}

struct cmd *
cmd_recv(struct buffer *b)
{
	const struct cmd_entry **entryp;
	struct cmd   	        *cmd;
	u_int			 m, n;

	buffer_read(b, &m, sizeof m);

	n = 0;
	for (entryp = cmd_table; *entryp != NULL; entryp++) {
		if (n == m)
			break;
		n++;
	}
	if (*entryp == NULL)
		fatalx("command not found");

	cmd = xmalloc(sizeof *cmd);
	cmd->entry = *entryp;

	if (cmd->entry->recv != NULL)
		cmd->entry->recv(cmd, b);
	return (cmd);
}

void
cmd_free(struct cmd *cmd)
{
	if (cmd->data != NULL && cmd->entry->free != NULL)
		cmd->entry->free(cmd);
	xfree(cmd);
}

size_t
cmd_print(struct cmd *cmd, char *buf, size_t len)
{
	if (cmd->entry->print == NULL) {
		return (xsnprintf(buf, len, "%s", cmd->entry->name));
	}
	return (cmd->entry->print(cmd, buf, len));
}

void
cmd_send_string(struct buffer *b, const char *s)
{
	size_t	n;

	if (s == NULL) {
		n = 0;
		buffer_write(b, &n, sizeof n);
		return;
	}

	n = strlen(s) + 1;
	buffer_write(b, &n, sizeof n);

	buffer_write(b, s, n);
}

char *
cmd_recv_string(struct buffer *b)
{
	char   *s;
	size_t	n;

	buffer_read(b, &n, sizeof n);

	if (n == 0)
		return (NULL);

	s = xmalloc(n);
	buffer_read(b, s, n);
	s[n - 1] = '\0';

	return (s);
}

/*
 * Figure out the current session. Use: 1) the current session, if the command
 * context has one; 2) the session specified in the TMUX variable from the
 * environment (as passed from the client); 3) the newest session.
 */
struct session *
cmd_current_session(struct cmd_ctx *ctx)
{
	struct msg_command_data	*data = ctx->msgdata;
	struct session		*s;

	if (ctx->cursession != NULL)
		return (ctx->cursession);

	if (data != NULL && data->pid != -1) {
		if (data->pid != getpid())
			return (NULL);
		if (data->idx > ARRAY_LENGTH(&sessions))
			return (NULL);
		if ((s = ARRAY_ITEM(&sessions, data->idx)) == NULL)
			return (NULL);
		return (s);
	}

	return (cmd_newest_session());
}

/* Find the newest session. */
struct session *
cmd_newest_session(void)
{
	struct session	*s, *snewest;
	struct timeval	*tv = NULL;
	u_int		 i;

	snewest = NULL;
	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
		if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
			continue;

		if (tv == NULL || timercmp(&s->tv, tv, >)) {
			snewest = s;
			tv = &s->tv;
		}
	}

	return (snewest);
}

/* Find the target client or report an error and return NULL. */
struct client *
cmd_find_client(struct cmd_ctx *ctx, const char *arg)
{
	struct client	*c;
	char		*tmparg;
	size_t		 arglen;

	/* A NULL argument means the current client. */
	if (arg == NULL)
		return (ctx->curclient);
	tmparg = xstrdup(arg);

	/* Trim a single trailing colon if any. */
	arglen = strlen(tmparg);
	if (arglen != 0 && tmparg[arglen - 1] == ':')
		tmparg[arglen - 1] = '\0';

	/* Find the client, if any. */
	c = cmd_lookup_client(tmparg);

	/* If no client found, report an error. */
	if (c == NULL)
		ctx->error(ctx, "client not found: %s", tmparg);

	xfree(tmparg);
	return (c);
}

/*
 * Lookup a client by device path. Either of a full match and a match without a
 * leading _PATH_DEV ("/dev/") is accepted.
 */
struct client *
cmd_lookup_client(const char *name)
{
	struct client	*c;
	const char	*path;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		if ((c = ARRAY_ITEM(&clients, i)) == NULL)
			continue;
		path = c->tty.path;

		/* Check for exact matches. */
		if (strcmp(name, path) == 0)
			return (c);

		/* Check without leading /dev if present. */
		if (strncmp(path, _PATH_DEV, (sizeof _PATH_DEV) - 1) != 0)
			continue;
		if (strcmp(name, path + (sizeof _PATH_DEV) - 1) == 0)
			return (c);
	}

	return (NULL);
}

/* Lookup a session by name. If no session is found, NULL is returned. */
struct session *
cmd_lookup_session(const char *name, int *ambiguous)
{
	struct session	*s, *sfound;
	u_int		 i;

	*ambiguous = 0;

	/*
	 * Look for matches. Session names must be unique so an exact match
	 * can't be ambigious and can just be returned.
	 */
	sfound = NULL;
	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {	
		if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
			continue;

		/* Check for an exact match and return it if found. */
		if (strcmp(name, s->name) == 0)
			return (s);
		
		/* Then check for pattern matches. */
		if (strncmp(name, s->name, strlen(name)) == 0 ||
		    fnmatch(name, s->name, 0) == 0) {
			if (sfound != NULL) {
				*ambiguous = 1;
				return (NULL);
			}
			sfound = s;
		}
	}
		
 	return (sfound);
}

/*
 * Lookup a window or return -1 if not found or ambigious. First try as an index
 * and if invalid, use fnmatch or leading prefix.
 */
struct winlink *
cmd_lookup_window(struct session *s, const char *name, int *ambiguous)
{
	struct winlink	*wl, *wlfound;
	struct window	*w;
	const char	*errstr;
	u_int		 idx;

	*ambiguous = 0;

	/* First see if this is a valid window index in this session. */
	idx = strtonum(name, 0, INT_MAX, &errstr);
	if (errstr == NULL) {
		if ((wl = winlink_find_by_index(&s->windows, idx)) != NULL)
			return (wl);
	}
		
	/* Look for exact matches, error if more than one. */
	wlfound = NULL;
	RB_FOREACH(wl, winlinks, &s->windows) {
		w = wl->window;
		if (strcmp(name, w->name) == 0) {
			if (wlfound != NULL) {
				*ambiguous = 1;
				return (NULL);
			}
			wlfound = wl;
		}
	}
	if (wlfound != NULL)
		return (wlfound);

	/* Now look for pattern matches, again error if multiple. */
	wlfound = NULL;
	RB_FOREACH(wl, winlinks, &s->windows) {
		w = wl->window;
		if (strncmp(name, w->name, strlen(name)) == 0 ||
		    fnmatch(name, w->name, 0) == 0) {
			if (wlfound != NULL) {
				*ambiguous = 1;
				return (NULL);
			}
			wlfound = wl;
		}
	}	
	if (wlfound != NULL)
		return (wlfound);

	return (NULL);
}

/* Find the target session or report an error and return NULL. */
struct session *
cmd_find_session(struct cmd_ctx *ctx, const char *arg)
{
	struct session	*s;
	struct client	*c;
	char		*tmparg;
	size_t		 arglen;
	int		 ambiguous;

	/* A NULL argument means the current session. */
	if (arg == NULL)
		return (cmd_current_session(ctx));
	tmparg = xstrdup(arg);

	/* Trim a single trailing colon if any. */
	arglen = strlen(tmparg);
	if (arglen != 0 && tmparg[arglen - 1] == ':')
		tmparg[arglen - 1] = '\0';

	/* Find the session, if any. */
	s = cmd_lookup_session(tmparg, &ambiguous);

	/* If it doesn't, try to match it as a client. */
	if (s == NULL && (c = cmd_lookup_client(tmparg)) != NULL)
		s = c->session;

	/* If no session found, report an error. */
	if (s == NULL) {
		if (ambiguous)
			ctx->error(ctx, "more than one session: %s", tmparg);
		else
			ctx->error(ctx, "session not found: %s", tmparg);
	}

	xfree(tmparg);
	return (s);
}

/* Find the target session and window or report an error and return NULL. */
struct winlink *
cmd_find_window(struct cmd_ctx *ctx, const char *arg, struct session **sp)
{
	struct session	*s;
	struct winlink	*wl;
	const char	*winptr;
	char		*sessptr = NULL;
	int		 ambiguous = 0;

	/*
	 * Find the current session. There must always be a current session, if
	 * it can't be found, report an error.
	 */
	if ((s = cmd_current_session(ctx)) == NULL) {
		ctx->error(ctx, "can't establish current session");
		return (NULL);
	}

	/* A NULL argument means the current session and window. */
	if (arg == NULL) {
		if (sp != NULL)
			*sp = s;
		return (s->curw);
	}

	/* Time to look at the argument. If it is empty, that is an error. */
	if (*arg == '\0')
		goto not_found;

	/* Find the separating colon. If none, assume the current session. */
	winptr = strchr(arg, ':');
	if (winptr == NULL)
		winptr = xstrdup(arg);
	else {
		winptr++;	/* skip : */
		sessptr = xstrdup(arg);
		*strchr(sessptr, ':') = '\0';
	}

	log_debug("%s: winptr=%s, sessptr=%s", __func__, winptr, sessptr);

	/* Try to lookup the session if present. */
	if (sessptr != NULL && *sessptr != '\0') {
		if  ((s = cmd_lookup_session(sessptr, &ambiguous)) == NULL)
			goto no_session;
	}
	if (sp != NULL)
		*sp = s;

	/*
	 * Then work out the window. An empty string is the current window,
	 * otherwise try to look it up in the session.
	 */
	if (winptr == NULL || *winptr == '\0')
		wl = s->curw;
	else if ((wl = cmd_lookup_window(s, winptr, &ambiguous)) == NULL)
		goto not_found;
	
	if (sessptr != NULL)
		xfree(sessptr);
	return (wl);

no_session:
	if (ambiguous)
		ctx->error(ctx, "multiple sessions: %s", sessptr);
	else
		ctx->error(ctx, "session not found: %s", sessptr);
	if (sessptr != NULL)
		xfree(sessptr);
	return (NULL);

not_found:
	if (ambiguous)
		ctx->error(ctx, "multiple windows: %s", arg);
	else
		ctx->error(ctx, "window not found: %s", arg);
	if (sessptr != NULL)
		xfree(sessptr);
	return (NULL);
}

/*
 * Find the target session and window index, whether or not it exists in the
 * session. Return -2 on error or -1 if no window index is specified. This is
 * used when parsing an argument for a window target that may not be exist (for
 * example it is going to be created).
 */
int
cmd_find_index(struct cmd_ctx *ctx, const char *arg, struct session **sp)
{
	struct session	*s;
	struct winlink	*wl;
	const char	*winptr, *errstr;
	char		*sessptr = NULL;
	int		 idx, ambiguous = 0;

	/*
	 * Find the current session. There must always be a current session, if
	 * it can't be found, report an error.
	 */
	if ((s = cmd_current_session(ctx)) == NULL) {
		ctx->error(ctx, "can't establish current session");
		return (-1);
	}

	/* A NULL argument means the current session and "no window" (-1). */
	if (arg == NULL) {
		if (sp != NULL)
			*sp = s;
		return (-1);
	}

	/* Time to look at the argument. If it is empty, that is an error. */
	if (*arg == '\0')
		goto not_found;

	/* Find the separating colon. If none, assume the current session. */
	winptr = strchr(arg, ':');
	if (winptr == NULL)
		winptr = xstrdup(arg);
	else {
		winptr++;	/* skip : */
		sessptr = xstrdup(arg);
		*strchr(sessptr, ':') = '\0';
	}

	log_debug("%s: winptr=%s, sessptr=%s", __func__, winptr, sessptr);

	/* Try to lookup the session if present. */
	if (sessptr != NULL && *sessptr != '\0') {
		if  ((s = cmd_lookup_session(sessptr, &ambiguous)) == NULL)
			goto no_session;
	}
	if (sp != NULL)
		*sp = s;

	/*
	 * Then work out the window. No : means "no window" (-1), an empty
	 * string is the current window, otherwise try to look it up in the
	 * session.
	 */
	if (winptr == NULL)
		idx = -1;
	else if (*winptr == '\0')
		idx = s->curw->idx;
	else if ((wl = cmd_lookup_window(s, winptr, &ambiguous)) == NULL) {
		if (ambiguous)
			goto not_found;
		/* Don't care it doesn't exist if this is a valid index. */
		idx = strtonum(winptr, 0, INT_MAX, &errstr);
		if (errstr != NULL)  {
			ctx->error(ctx, "index %s: %s", errstr, winptr);
			idx = -2;
		}
	} else
		idx = wl->idx;
	
	if (sessptr != NULL)
		xfree(sessptr);
	return (idx);

no_session:
	if (ambiguous)
 		ctx->error(ctx, "multiple sessions: %s", sessptr);
	else
		ctx->error(ctx, "session not found: %s", sessptr);
	if (sessptr != NULL)
		xfree(sessptr);
	return (-2);

not_found:
	if (ambiguous)
		ctx->error(ctx, "multiple windows: %s", arg);
	else
		ctx->error(ctx, "window not found: %s", arg);
	if (sessptr != NULL)
		xfree(sessptr);
	return (-2);
}