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Merge branch 'birdcl'

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This commit is contained in:
Ondrej Zajicek 2013-04-23 02:54:13 +02:00
commit 32622d0ea3
9 changed files with 543 additions and 252 deletions
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8
client/Makefile
View file

@ -1,5 +1,11 @@
source=client.c commands.c util.c
source=commands.c util.c client.c
root-rel=../
dir-name=client
clients := $(client) birdcl
source-dep := $(source) $(addsuffix .c,$(clients))
subdir: $(addsuffix .o,$(clients))
include ../Rules

223
client/birdc.c Normal file
View file

@ -0,0 +1,223 @@
/*
* BIRD Client - Readline variant I/O
*
* (c) 1999--2004 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <curses.h>
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "client/client.h"
#include "sysdep/unix/unix.h"
static int input_hidden_end;
static int prompt_active;
/*** Input ***/
/* HACK: libreadline internals we need to access */
extern int _rl_vis_botlin;
extern void _rl_move_vert(int);
extern Function *rl_last_func;
static void
add_history_dedup(char *cmd)
{
/* Add history line if it differs from the last one */
HIST_ENTRY *he = history_get(history_length);
if (!he || strcmp(he->line, cmd))
add_history(cmd);
}
static void
input_got_line(char *cmd_buffer)
{
if (!cmd_buffer)
{
cleanup();
exit(0);
}
if (cmd_buffer[0])
{
add_history_dedup(cmd_buffer);
submit_command(cmd_buffer);
}
free(cmd_buffer);
}
void
input_start_list(void)
{
/* Leave the currently edited line and make space for listing */
_rl_move_vert(_rl_vis_botlin);
#ifdef HAVE_RL_CRLF
rl_crlf();
#endif
}
void
input_stop_list(void)
{
/* Reprint the currently edited line after listing */
rl_on_new_line();
rl_redisplay();
}
static int
input_complete(int arg UNUSED, int key UNUSED)
{
static int complete_flag;
char buf[256];
if (rl_last_func != input_complete)
complete_flag = 0;
switch (cmd_complete(rl_line_buffer, rl_point, buf, complete_flag))
{
case 0:
complete_flag = 1;
break;
case 1:
rl_insert_text(buf);
break;
default:
complete_flag = 1;
#ifdef HAVE_RL_DING
rl_ding();
#endif
}
return 0;
}
static int
input_help(int arg, int key UNUSED)
{
int i, in_string, in_bracket;
if (arg != 1)
return rl_insert(arg, '?');
in_string = in_bracket = 0;
for (i = 0; i < rl_point; i++)
{
if (rl_line_buffer[i] == '"')
in_string = ! in_string;
else if (! in_string)
{
if (rl_line_buffer[i] == '[')
in_bracket++;
else if (rl_line_buffer[i] == ']')
in_bracket--;
}
}
/* `?' inside string or path -> insert */
if (in_string || in_bracket)
return rl_insert(1, '?');
rl_begin_undo_group(); /* HACK: We want to display `?' at point position */
rl_insert_text("?");
rl_redisplay();
rl_end_undo_group();
input_start_list();
cmd_help(rl_line_buffer, rl_point);
rl_undo_command(1, 0);
input_stop_list();
return 0;
}
void
input_init(void)
{
rl_readline_name = "birdc";
rl_add_defun("bird-complete", input_complete, '\t');
rl_add_defun("bird-help", input_help, '?');
rl_callback_handler_install("bird> ", input_got_line);
// rl_get_screen_size();
term_lns = LINES ? LINES : 25;
term_cls = COLS ? COLS : 80;
prompt_active = 1;
// readline library does strange things when stdin is nonblocking.
// if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)
// die("fcntl: %m");
}
static void
input_reveal(void)
{
/* need this, otherwise some lib seems to eat pending output when
the prompt is displayed */
fflush(stdout);
tcdrain(STDOUT_FILENO);
rl_end = input_hidden_end;
rl_expand_prompt("bird> ");
rl_forced_update_display();
prompt_active = 1;
}
static void
input_hide(void)
{
input_hidden_end = rl_end;
rl_end = 0;
rl_expand_prompt("");
rl_redisplay();
prompt_active = 0;
}
void
input_notify(int prompt)
{
if (prompt == prompt_active)
return;
if (prompt)
input_reveal();
else
input_hide();
}
void
input_read(void)
{
rl_callback_read_char();
}
void
more_begin(void)
{
}
void
more_end(void)
{
}
void
cleanup(void)
{
if (init)
return;
input_hide();
rl_callback_handler_remove();
}

165
client/birdcl.c Normal file
View file

@ -0,0 +1,165 @@
/*
* BIRD Client - Light variant I/O
*
* (c) 1999--2004 Martin Mares <mj@ucw.cz>
* (c) 2013 Tomas Hlavacek <tomas.hlavacek@nic.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <signal.h>
#include "nest/bird.h"
#include "lib/resource.h"
#include "lib/string.h"
#include "client/client.h"
#include "sysdep/unix/unix.h"
#define INPUT_BUF_LEN 2048
struct termios tty_save;
void
input_start_list(void)
{
/* Empty in non-ncurses version. */
}
void
input_stop_list(void)
{
/* Empty in non-ncurses version. */
}
void
input_notify(int prompt)
{
/* No ncurses -> no status to reveal/hide, print prompt manually. */
if (!prompt)
return;
printf("bird> ");
fflush(stdout);
}
static int
lastnb(char *str, int i)
{
while (i--)
if ((str[i] != ' ') && (str[i] != '\t'))
return str[i];
return 0;
}
void
input_read(void)
{
char buf[INPUT_BUF_LEN];
if ((fgets(buf, INPUT_BUF_LEN, stdin) == NULL) || (buf[0] == 0))
{
putchar('\n');
cleanup();
exit(0);
}
int l = strlen(buf);
if ((l+1) == INPUT_BUF_LEN)
{
printf("Input too long.\n");
return;
}
if (buf[l-1] == '\n')
buf[--l] = '\0';
if (!interactive)
printf("%s\n", buf);
if (l == 0)
return;
if (lastnb(buf, l) == '?')
{
cmd_help(buf, strlen(buf));
return;
}
submit_command(buf);
}
static struct termios stored_tty;
static int more_active = 0;
void
more_begin(void)
{
static struct termios tty;
tty = stored_tty;
tty.c_lflag &= (~ECHO);
tty.c_lflag &= (~ICANON);
if (tcsetattr (0, TCSANOW, &tty) < 0)
die("tcsetattr: %m");
more_active = 1;
}
void
more_end(void)
{
more_active = 0;
if (tcsetattr (0, TCSANOW, &stored_tty) < 0)
die("tcsetattr: %m");
}
static void
sig_handler(int signal)
{
cleanup();
exit(0);
}
void
input_init(void)
{
if (!interactive)
return;
if (tcgetattr(0, &stored_tty) < 0)
die("tcgetattr: %m");
if (signal(SIGINT, sig_handler) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if (signal(SIGTERM, sig_handler) == SIG_IGN)
signal(SIGTERM, SIG_IGN);
struct winsize tws;
if (ioctl(0, TIOCGWINSZ, &tws) == 0)
{
term_lns = tws.ws_row;
term_cls = tws.ws_col;
}
else
{
term_lns = 25;
term_cls = 80;
}
}
void
cleanup(void)
{
if (more_active)
more_end();
}

338
client/client.c
View file

@ -2,22 +2,32 @@
* BIRD Client
*
* (c) 1999--2004 Martin Mares <mj@ucw.cz>
* (c) 2013 Tomas Hlavacek <tmshlvck@gmail.com>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: BIRD client
*
* There are two variants of BIRD client: regular and light. regular
* variant depends on readline and ncurses libraries, while light
* variant uses just libc. Most of the code and the main() is common
* for both variants (in client.c file) and just a few functions are
* different (in birdc.c for regular and birdcl.c for light). Two
* binaries are generated by linking common object files like client.o
* (which is compiled from client.c just once) with either birdc.o or
* birdcl.o for each variant.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/types.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <curses.h>
#include "nest/bird.h"
#include "lib/resource.h"
@ -25,34 +35,31 @@
#include "client/client.h"
#include "sysdep/unix/unix.h"
#define SERVER_READ_BUF_LEN 4096
static char *opt_list = "s:vr";
static int verbose;
static int verbose, restricted, once;
static char *init_cmd;
static int once;
static int restricted;
static char *server_path = PATH_CONTROL_SOCKET;
static int server_fd;
static byte server_read_buf[4096];
static byte server_read_buf[SERVER_READ_BUF_LEN];
static byte *server_read_pos = server_read_buf;
#define STATE_PROMPT 0
#define STATE_CMD_SERVER 1
#define STATE_CMD_USER 2
int init = 1; /* During intial sequence */
int busy = 1; /* Executing BIRD command */
int interactive; /* Whether stdin is terminal */
static int input_initialized;
static int input_hidden_end;
static int cstate = STATE_CMD_SERVER;
static int nstate = STATE_CMD_SERVER;
static int num_lines, skip_input;
int term_lns, term_cls;
static int num_lines, skip_input, interactive;
/*** Parsing of arguments ***/
static void
usage(void)
usage(char *name)
{
fprintf(stderr, "Usage: birdc [-s <control-socket>] [-v] [-r]\n");
fprintf(stderr, "Usage: %s [-s <control-socket>] [-v] [-r]\n", name);
exit(1);
}
@ -74,7 +81,7 @@ parse_args(int argc, char **argv)
restricted = 1;
break;
default:
usage();
usage(argv[0]);
}
/* If some arguments are not options, we take it as commands */
@ -97,17 +104,14 @@ parse_args(int argc, char **argv)
tmp[-1] = 0;
once = 1;
interactive = 0;
}
}
/*** Input ***/
static void server_send(char *);
/* HACK: libreadline internals we need to access */
extern int _rl_vis_botlin;
extern void _rl_move_vert(int);
extern Function *rl_last_func;
static void server_send(char *cmd);
static int
handle_internal_command(char *cmd)
@ -125,182 +129,31 @@ handle_internal_command(char *cmd)
return 0;
}
void
static void
submit_server_command(char *cmd)
{
server_send(cmd);
nstate = STATE_CMD_SERVER;
busy = 1;
num_lines = 2;
}
static void
add_history_dedup(char *cmd)
{
/* Add history line if it differs from the last one */
HIST_ENTRY *he = history_get(history_length);
if (!he || strcmp(he->line, cmd))
add_history(cmd);
}
static void
got_line(char *cmd_buffer)
{
char *cmd;
if (!cmd_buffer)
{
cleanup();
exit(0);
}
if (cmd_buffer[0])
{
cmd = cmd_expand(cmd_buffer);
if (cmd)
{
add_history_dedup(cmd);
if (!handle_internal_command(cmd))
submit_server_command(cmd);
free(cmd);
}
else
add_history_dedup(cmd_buffer);
}
free(cmd_buffer);
server_send(cmd);
}
void
input_start_list(void) /* Leave the currently edited line and make space for listing */
submit_command(char *cmd_raw)
{
_rl_move_vert(_rl_vis_botlin);
#ifdef HAVE_RL_CRLF
rl_crlf();
#endif
}
char *cmd = cmd_expand(cmd_raw);
void
input_stop_list(void) /* Reprint the currently edited line after listing */
{
rl_on_new_line();
rl_redisplay();
}
static int
input_complete(int arg UNUSED, int key UNUSED)
{
static int complete_flag;
char buf[256];
if (rl_last_func != input_complete)
complete_flag = 0;
switch (cmd_complete(rl_line_buffer, rl_point, buf, complete_flag))
{
case 0:
complete_flag = 1;
break;
case 1:
rl_insert_text(buf);
break;
default:
complete_flag = 1;
#ifdef HAVE_RL_DING
rl_ding();
#endif
}
return 0;
}
static int
input_help(int arg, int key UNUSED)
{
int i, in_string, in_bracket;
if (arg != 1)
return rl_insert(arg, '?');
in_string = in_bracket = 0;
for (i = 0; i < rl_point; i++)
{
if (rl_line_buffer[i] == '"')
in_string = ! in_string;
else if (! in_string)
{
if (rl_line_buffer[i] == '[')
in_bracket++;
else if (rl_line_buffer[i] == ']')
in_bracket--;
}
}
/* `?' inside string or path -> insert */
if (in_string || in_bracket)
return rl_insert(1, '?');
rl_begin_undo_group(); /* HACK: We want to display `?' at point position */
rl_insert_text("?");
rl_redisplay();
rl_end_undo_group();
input_start_list();
cmd_help(rl_line_buffer, rl_point);
rl_undo_command(1, 0);
input_stop_list();
return 0;
}
static void
input_init(void)
{
rl_readline_name = "birdc";
rl_add_defun("bird-complete", input_complete, '\t');
rl_add_defun("bird-help", input_help, '?');
rl_callback_handler_install("bird> ", got_line);
input_initialized = 1;
// readline library does strange things when stdin is nonblocking.
// if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)
// die("fcntl: %m");
}
static void
input_hide(void)
{
input_hidden_end = rl_end;
rl_end = 0;
rl_expand_prompt("");
rl_redisplay();
}
static void
input_reveal(void)
{
/* need this, otherwise some lib seems to eat pending output when
the prompt is displayed */
fflush(stdout);
tcdrain(fileno(stdout));
rl_end = input_hidden_end;
rl_expand_prompt("bird> ");
rl_forced_update_display();
}
void
cleanup(void)
{
if (input_initialized)
{
input_initialized = 0;
input_hide();
rl_callback_handler_remove();
}
}
void
update_state(void)
{
if (nstate == cstate)
if (!cmd)
return;
if (!handle_internal_command(cmd))
submit_server_command(cmd);
free(cmd);
}
static void
init_commands(void)
{
if (restricted)
{
submit_server_command("restrict");
@ -317,40 +170,35 @@ update_state(void)
return;
}
if (!init_cmd && once)
if (once)
{
/* Initial command is finished and we want to exit */
cleanup();
exit(0);
}
if (nstate == STATE_PROMPT)
{
if (input_initialized)
input_reveal();
else
input_init();
}
if (nstate != STATE_PROMPT)
input_hide();
cstate = nstate;
input_init();
init = 0;
}
/*** Output ***/
void
more(void)
{
more_begin();
printf("--More--\015");
fflush(stdout);
redo:
switch (getchar())
{
case 32:
case ' ':
num_lines = 2;
break;
case 13:
case '\n':
case '\r':
num_lines--;
break;
case 'q':
@ -362,6 +210,7 @@ more(void)
printf(" \015");
fflush(stdout);
more_end();
}
@ -388,6 +237,7 @@ server_connect(void)
die("fcntl: %m");
}
#define PRINTF(LEN, PARGS...) do { if (!skip_input) len = printf(PARGS); } while(0)
static void
@ -396,36 +246,32 @@ server_got_reply(char *x)
int code;
int len = 0;
if (*x == '+') /* Async reply */
if (*x == '+') /* Async reply */
PRINTF(len, ">>> %s\n", x+1);
else if (x[0] == ' ') /* Continuation */
else if (x[0] == ' ') /* Continuation */
PRINTF(len, "%s%s\n", verbose ? " " : "", x+1);
else if (strlen(x) > 4 &&
sscanf(x, "%d", &code) == 1 && code >= 0 && code < 10000 &&
(x[4] == ' ' || x[4] == '-'))
sscanf(x, "%d", &code) == 1 && code >= 0 && code < 10000 &&
(x[4] == ' ' || x[4] == '-'))
{
if (code)
PRINTF(len, "%s\n", verbose ? x : x+5);
PRINTF(len, "%s\n", verbose ? x : x+5);
if (x[4] == ' ')
{
nstate = STATE_PROMPT;
skip_input = 0;
return;
busy = 0;
skip_input = 0;
return;
}
}
else
PRINTF(len, "??? <%s>\n", x);
if (skip_input)
return;
if (interactive && input_initialized && (len > 0))
if (interactive && busy && !skip_input && !init && (len > 0))
{
int lns = LINES ? LINES : 25;
int cls = COLS ? COLS : 80;
num_lines += (len + cls - 1) / cls; /* Divide and round up */
if ((num_lines >= lns) && (cstate == STATE_CMD_SERVER))
more();
num_lines += (len + term_cls - 1) / term_cls; /* Divide and round up */
if (num_lines >= term_lns)
more();
}
}
@ -470,19 +316,23 @@ server_read(void)
}
}
static fd_set select_fds;
static void
select_loop(void)
{
int rv;
while (1)
{
if (init && !busy)
init_commands();
if (!init)
input_notify(!busy);
fd_set select_fds;
FD_ZERO(&select_fds);
if (cstate != STATE_CMD_USER)
FD_SET(server_fd, &select_fds);
if (cstate != STATE_CMD_SERVER)
FD_SET(server_fd, &select_fds);
if (!busy)
FD_SET(0, &select_fds);
rv = select(server_fd+1, &select_fds, NULL, NULL, NULL);
@ -494,16 +344,16 @@ select_loop(void)
die("select: %m");
}
if (FD_ISSET(0, &select_fds))
{
input_read();
continue;
}
if (FD_ISSET(server_fd, &select_fds))
{
server_read();
update_state();
}
if (FD_ISSET(0, &select_fds))
{
rl_callback_read_char();
update_state();
continue;
}
}
}
@ -561,14 +411,22 @@ server_send(char *cmd)
}
}
/* XXXX
get_term_size();
if (tcgetattr(0, &tty_save) != 0)
{
perror("tcgetattr error");
return(EXIT_FAILURE);
}
}
*/
int
main(int argc, char **argv)
{
#ifdef HAVE_LIBDMALLOC
if (!getenv("DMALLOC_OPTIONS"))
dmalloc_debug(0x2f03d00);
#endif
interactive = isatty(0);
parse_args(argc, argv);
cmd_build_tree();

20
client/client.h
View file

@ -6,15 +6,31 @@
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/* client.c */
void cleanup(void);
extern int init, busy, interactive;
extern int term_lns, term_cls;
/* birdc.c / birdcl.c */
void input_start_list(void);
void input_stop_list(void);
void input_init(void);
void input_notify(int prompt);
void input_read(void);
void more_begin(void);
void more_end(void);
void cleanup(void);
/* commands.c */
void cmd_build_tree(void);
void cmd_help(char *cmd, int len);
int cmd_complete(char *cmd, int len, char *buf, int again);
char *cmd_expand(char *cmd);
/* client.c */
void submit_command(char *cmd_raw);

2
configure.in
View file

@ -236,7 +236,7 @@ fi
CLIENT=
CLIENT_LIBS=
if test "$enable_client" = yes ; then
CLIENT=client
CLIENT=birdc
AC_CHECK_LIB(history, add_history, CLIENT_LIBS="-lhistory")
AC_CHECK_LIB(ncurses, tgetent, USE_TERMCAP_LIB=-lncurses,
AC_CHECK_LIB(curses, tgetent, USE_TERMCAP_LIB=-lcurses,

8
doc/bird.sgml
View file

@ -623,7 +623,13 @@ codes along with the messages. You do not necessarily need to use
-- the format of communication between BIRD and <file/birdc/ is stable
(see the programmer's documentation).
Many commands have the <m/name/ of the protocol instance as an argument.
<p>There is also lightweight variant of BIRD client called
<file/birdcl/, which does not support command line editing and history
and has minimal dependencies. This is useful for running BIRD in
resource constrained environments, where Readline library (required
for regular BIRD client) is not available.
<p>Many commands have the <m/name/ of the protocol instance as an argument.
This argument can be omitted if there exists only a single instance.
<p>Here is a brief list of supported functions:

23
tools/Makefile.in
View file

@ -3,22 +3,31 @@
include Rules
.PHONY: all daemon client subdir depend clean distclean tags docs userdocs progdocs
.PHONY: all daemon birdc birdcl subdir depend clean distclean tags docs userdocs progdocs
all: sysdep/paths.h .dep-stamp subdir daemon @CLIENT@
all: sysdep/paths.h .dep-stamp subdir daemon birdcl @CLIENT@
daemon: $(exedir)/bird
client: $(exedir)/birdc
birdc: $(exedir)/birdc
birdcl: $(exedir)/birdcl
bird-dep := $(addsuffix /all.o, $(static-dirs)) conf/all.o lib/birdlib.a
$(bird-dep): sysdep/paths.h .dep-stamp subdir
birdc-dep := client/all.o lib/birdlib.a
birdc-dep := client/birdc.o client/all.o lib/birdlib.a
$(birdc-dep): sysdep/paths.h .dep-stamp subdir
birdcl-dep := client/birdcl.o client/all.o lib/birdlib.a
$(birdcl-dep): sysdep/paths.h .dep-stamp subdir
export client := @CLIENT@
depend: sysdep/paths.h .dir-stamp
set -e ; for a in $(dynamic-dirs) ; do $(MAKE) -C $$a $@ ; done
set -e ; for a in $(static-dirs) $(client-dirs) ; do $(MAKE) -C $$a -f $(srcdir_abs)/$$a/Makefile $@ ; done
@ -33,6 +42,9 @@ $(exedir)/bird: $(bird-dep)
$(exedir)/birdc: $(birdc-dep)
$(CC) $(LDFLAGS) -o $@ $^ $(LIBS) $(CLIENT_LIBS)
$(exedir)/birdcl: $(birdcl-dep)
$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
.dir-stamp: sysdep/paths.h
mkdir -p $(static-dirs) $(client-dirs) $(doc-dirs)
touch .dir-stamp
@ -58,6 +70,7 @@ tags:
install: all
$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir) $(DESTDIR)/@runtimedir@
$(INSTALL_PROGRAM) -s $(exedir)/bird $(DESTDIR)/$(sbindir)/bird@SUFFIX@
$(INSTALL_PROGRAM) -s $(exedir)/birdcl $(DESTDIR)/$(sbindir)/birdcl@SUFFIX@
if test -n "@CLIENT@" ; then \
$(INSTALL_PROGRAM) -s $(exedir)/birdc $(DESTDIR)/$(sbindir)/birdc@SUFFIX@ ; \
fi
@ -74,7 +87,7 @@ install-docs:
clean:
find . -name "*.[oa]" -o -name core -o -name depend -o -name "*.html" | xargs rm -f
rm -f conf/cf-lex.c conf/cf-parse.* conf/commands.h conf/keywords.h
rm -f $(exedir)/bird $(exedir)/birdc $(exedir)/bird.ctl $(exedir)/bird6.ctl .dep-stamp
rm -f $(exedir)/bird $(exedir)/birdcl $(exedir)/birdc $(exedir)/bird.ctl $(exedir)/bird6.ctl .dep-stamp
distclean: clean
rm -f config.* configure sysdep/autoconf.h sysdep/paths.h Makefile Rules

8
tools/Rules.in
View file

@ -11,7 +11,7 @@ static-dirs := nest filter $(addprefix proto/,$(protocols))
static-dir-paths := $(addprefix $(srcdir)/,$(static-dirs))
dynamic-dirs := lib conf
dynamic-dir-paths := $(dynamic-dirs)
client-dirs := @CLIENT@
client-dirs := client
client-dir-paths := $(client-dirs)
doc-dirs := doc
doc-dir-paths := $(doc-dirs)
@ -75,8 +75,12 @@ endif
%.o: $(src-path)%.c
$(CC) $(CFLAGS) -o $@ -c $<
ifndef source-dep
source-dep := $(source)
endif
depend:
$(CC) $(CPPFLAGS) -MM $(addprefix $(src-path),$(source)) >depend
$(CC) $(CPPFLAGS) -MM $(addprefix $(src-path),$(source-dep)) >depend
ifneq ($(wildcard depend),)
include depend