text: /* $OpenBSD$ */
  
  /*
   * Copyright (c) 2012 Nicholas Marriott <nicholas.marriott@gmail.com>
   * Copyright (c) 2012 George Nachman <tmux@georgester.com>
   *
   * 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 <event.h>
  #include <stdlib.h>
  #include <string.h>
  #include <time.h>
  
  #include "tmux.h"
  
  /* Write a line. */
  void
  control_write(struct client *c, const char *fmt, ...)
  {
  	va_list		 ap;
  
  	va_start(ap, fmt);
  	evbuffer_add_vprintf(c->stdout_data, fmt, ap);
  	va_end(ap);
  
  	evbuffer_add(c->stdout_data, "\n", 1);
  	server_client_push_stdout(c);
  }
  
  /* Write a buffer, adding a terminal newline. Empties buffer. */
  void
  control_write_buffer(struct client *c, struct evbuffer *buffer)
  {
  	evbuffer_add_buffer(c->stdout_data, buffer);
  	evbuffer_add(c->stdout_data, "\n", 1);
  	server_client_push_stdout(c);
  }
  
  /* Control error callback. */
  static enum cmd_retval
  control_error(struct cmdq_item *item, void *data)
  {
  	struct client	*c = item->client;
  	char		*error = data;
  
  	cmdq_guard(item, "begin", 1);
  	control_write(c, "parse error: %s", error);
  	cmdq_guard(item, "error", 1);
  
  	free(error);
  	return (CMD_RETURN_NORMAL);
  }
  
  /* Control input callback. Read lines and fire commands. */
  void
  control_callback(struct client *c, int closed, __unused void *data)
  {
  	char			*line;
  	struct cmdq_item	*item;
  	struct cmd_parse_result	*pr;
  
  	if (closed)
  		c->flags |= CLIENT_EXIT;
  
  	for (;;) {
  		line = evbuffer_readln(c->stdin_data, NULL, EVBUFFER_EOL_LF);
  		if (line == NULL)
  			break;
  		if (*line == '\0') { /* empty line exit */
  			c->flags |= CLIENT_EXIT;
  			break;
  		}
  
  		pr = cmd_parse_from_string(line, NULL);
  		switch (pr->status) {
  		case CMD_PARSE_EMPTY:
  			break;
  		case CMD_PARSE_ERROR:
  			item = cmdq_get_callback(control_error, pr->error);
  			cmdq_append(c, item);
  			free(pr->error);
  			break;
  		case CMD_PARSE_SUCCESS:
  			item = cmdq_get_command(pr->cmdlist, NULL, NULL, 0);
  			item->shared->flags |= CMDQ_SHARED_CONTROL;
  			cmdq_append(c, item);
  			cmd_list_free(pr->cmdlist);
  			break;
  		}
  
  		free(line);
  	}
  }
  