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Initial revision
git-svn-id: file:///srv/svn/joey/bsdgames-trunk@5086 a4a2c43b-8ac3-0310-8836-e0e880c912e2
This commit is contained in:
joey
682
atc/input.c
Normal file
682
atc/input.c
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@@ -0,0 +1,682 @@
|
||||
/* $NetBSD: input.c,v 1.10 1998/09/13 15:20:31 hubertf Exp $ */
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/*-
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* Copyright (c) 1990, 1993
|
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* The Regents of the University of California. All rights reserved.
|
||||
*
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||||
* This code is derived from software contributed to Berkeley by
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* Ed James.
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*
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||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
|
||||
*
|
||||
* Copy permission is hereby granted provided that this notice is
|
||||
* retained on all partial or complete copies.
|
||||
*
|
||||
* For more info on this and all of my stuff, mail edjames@berkeley.edu.
|
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*/
|
||||
|
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)input.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: input.c,v 1.10 1998/09/13 15:20:31 hubertf Exp $");
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#endif
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#endif not lint
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#include "include.h"
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#include "pathnames.h"
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|
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#define MAXRULES 6
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#define MAXDEPTH 15
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|
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#define RETTOKEN '\n'
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#define REDRAWTOKEN '\014' /* CTRL(L) */
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#define SHELLTOKEN '!'
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#define HELPTOKEN '?'
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#define ALPHATOKEN 256
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#define NUMTOKEN 257
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|
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typedef struct {
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int token;
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int to_state;
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const char *str;
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const char *(*func) __P((char));
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} RULE;
|
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|
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typedef struct {
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int num_rules;
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RULE *rule;
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} STATE;
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typedef struct {
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char str[20];
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int state;
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int rule;
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int ch;
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int pos;
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} STACK;
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#define T_RULE stack[level].rule
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#define T_STATE stack[level].state
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#define T_STR stack[level].str
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#define T_POS stack[level].pos
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#define T_CH stack[level].ch
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#define NUMELS(a) (sizeof (a) / sizeof (*(a)))
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|
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#define NUMSTATES NUMELS(st)
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RULE state0[] = { { ALPHATOKEN, 1, "%c:", setplane},
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{ RETTOKEN, -1, "", NULL },
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{ HELPTOKEN, 12, " [a-z]<ret>", NULL }},
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state1[] = { { 't', 2, " turn", turn },
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{ 'a', 3, " altitude:", NULL },
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{ 'c', 4, " circle", circle },
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{ 'm', 7, " mark", mark },
|
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{ 'u', 7, " unmark", unmark },
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{ 'i', 7, " ignore", ignore },
|
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{ HELPTOKEN, 12, " tacmui", NULL }},
|
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state2[] = { { 'l', 6, " left", left },
|
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{ 'r', 6, " right", right },
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{ 'L', 4, " left 90", Left },
|
||||
{ 'R', 4, " right 90", Right },
|
||||
{ 't', 11, " towards", NULL },
|
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{ 'w', 4, " to 0", to_dir },
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{ 'e', 4, " to 45", to_dir },
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{ 'd', 4, " to 90", to_dir },
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||||
{ 'c', 4, " to 135", to_dir },
|
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{ 'x', 4, " to 180", to_dir },
|
||||
{ 'z', 4, " to 225", to_dir },
|
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{ 'a', 4, " to 270", to_dir },
|
||||
{ 'q', 4, " to 315", to_dir },
|
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{ HELPTOKEN, 12, " lrLRt<dir>", NULL }},
|
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state3[] = { { '+', 10, " climb", climb },
|
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{ 'c', 10, " climb", climb },
|
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{ '-', 10, " descend", descend },
|
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{ 'd', 10, " descend", descend },
|
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{ NUMTOKEN, 7, " %c000 feet", setalt },
|
||||
{ HELPTOKEN, 12, " +-cd[0-9]", NULL }},
|
||||
state4[] = { { '@', 9, " at", NULL },
|
||||
{ 'a', 9, " at", NULL },
|
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{ RETTOKEN, -1, "", NULL },
|
||||
{ HELPTOKEN, 12, " @a<ret>", NULL }},
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state5[] = { { NUMTOKEN, 7, "%c", delayb },
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{ HELPTOKEN, 12, " [0-9]", NULL }},
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state6[] = { { '@', 9, " at", NULL },
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{ 'a', 9, " at", NULL },
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{ 'w', 4, " 0", rel_dir },
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{ 'e', 4, " 45", rel_dir },
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{ 'd', 4, " 90", rel_dir },
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{ 'c', 4, " 135", rel_dir },
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{ 'x', 4, " 180", rel_dir },
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{ 'z', 4, " 225", rel_dir },
|
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{ 'a', 4, " 270", rel_dir },
|
||||
{ 'q', 4, " 315", rel_dir },
|
||||
{ RETTOKEN, -1, "", NULL },
|
||||
{ HELPTOKEN, 12, " @a<dir><ret>",NULL }},
|
||||
state7[] = { { RETTOKEN, -1, "", NULL },
|
||||
{ HELPTOKEN, 12, " <ret>", NULL }},
|
||||
state8[] = { { NUMTOKEN, 4, "%c", benum },
|
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{ HELPTOKEN, 12, " [0-9]", NULL }},
|
||||
state9[] = { { 'b', 5, " beacon #", NULL },
|
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{ '*', 5, " beacon #", NULL },
|
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{ HELPTOKEN, 12, " b*", NULL }},
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state10[] = { { NUMTOKEN, 7, " %c000 ft", setrelalt},
|
||||
{ HELPTOKEN, 12, " [0-9]", NULL }},
|
||||
state11[] = { { 'b', 8, " beacon #", beacon },
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{ '*', 8, " beacon #", beacon },
|
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{ 'e', 8, " exit #", ex_it },
|
||||
{ 'a', 8, " airport #", airport },
|
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{ HELPTOKEN, 12, " b*ea", NULL }},
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||||
state12[] = { { -1, -1, "", NULL }};
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||||
|
||||
#define DEF_STATE(s) { NUMELS(s), (s) }
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||||
|
||||
STATE st[] = {
|
||||
DEF_STATE(state0), DEF_STATE(state1), DEF_STATE(state2),
|
||||
DEF_STATE(state3), DEF_STATE(state4), DEF_STATE(state5),
|
||||
DEF_STATE(state6), DEF_STATE(state7), DEF_STATE(state8),
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DEF_STATE(state9), DEF_STATE(state10), DEF_STATE(state11),
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||||
DEF_STATE(state12)
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||||
};
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||||
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PLANE p;
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||||
STACK stack[MAXDEPTH];
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||||
int level;
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||||
int tval;
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||||
int dest_type, dest_no, dir;
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||||
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||||
int
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||||
pop()
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||||
{
|
||||
if (level == 0)
|
||||
return (-1);
|
||||
level--;
|
||||
|
||||
ioclrtoeol(T_POS);
|
||||
|
||||
strcpy(T_STR, "");
|
||||
T_RULE = -1;
|
||||
T_CH = -1;
|
||||
return (0);
|
||||
}
|
||||
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||||
void
|
||||
rezero()
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||||
{
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||||
iomove(0);
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||||
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||||
level = 0;
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||||
T_STATE = 0;
|
||||
T_RULE = -1;
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T_CH = -1;
|
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T_POS = 0;
|
||||
strcpy(T_STR, "");
|
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}
|
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|
||||
void
|
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push(ruleno, ch)
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||||
int ruleno, ch;
|
||||
{
|
||||
int newstate, newpos;
|
||||
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||||
(void)sprintf(T_STR, st[T_STATE].rule[ruleno].str, tval);
|
||||
T_RULE = ruleno;
|
||||
T_CH = ch;
|
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newstate = st[T_STATE].rule[ruleno].to_state;
|
||||
newpos = T_POS + strlen(T_STR);
|
||||
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||||
ioaddstr(T_POS, T_STR);
|
||||
|
||||
if (level == 0)
|
||||
ioclrtobot();
|
||||
level++;
|
||||
T_STATE = newstate;
|
||||
T_POS = newpos;
|
||||
T_RULE = -1;
|
||||
strcpy(T_STR, "");
|
||||
}
|
||||
|
||||
int
|
||||
getcommand()
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||||
{
|
||||
int c, i, done;
|
||||
const char *s, *(*func) __P((char));
|
||||
PLANE *pp;
|
||||
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||||
rezero();
|
||||
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||||
do {
|
||||
c = gettoken();
|
||||
if (c == tty_new.c_cc[VERASE]) {
|
||||
if (pop() < 0)
|
||||
noise();
|
||||
} else if (c == tty_new.c_cc[VKILL]) {
|
||||
while (pop() >= 0)
|
||||
;
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||||
} else {
|
||||
done = 0;
|
||||
for (i = 0; i < st[T_STATE].num_rules; i++) {
|
||||
if (st[T_STATE].rule[i].token == c ||
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||||
st[T_STATE].rule[i].token == tval) {
|
||||
push(i, (c >= ALPHATOKEN) ? tval : c);
|
||||
done = 1;
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||||
break;
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||||
}
|
||||
}
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||||
if (!done)
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||||
noise();
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||||
}
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} while (T_STATE != -1);
|
||||
|
||||
if (level == 1)
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||||
return (1); /* forced update */
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||||
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||||
dest_type = T_NODEST;
|
||||
|
||||
for (i = 0; i < level; i++) {
|
||||
func = st[stack[i].state].rule[stack[i].rule].func;
|
||||
if (func != NULL)
|
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if ((s = (*func)(stack[i].ch)) != NULL) {
|
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ioerror(stack[i].pos, strlen(stack[i].str), s);
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return (-1);
|
||||
}
|
||||
}
|
||||
|
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pp = findplane(p.plane_no);
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if (pp->new_altitude != p.new_altitude)
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pp->new_altitude = p.new_altitude;
|
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else if (pp->status != p.status)
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pp->status = p.status;
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else {
|
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pp->new_dir = p.new_dir;
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pp->delayd = p.delayd;
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pp->delayd_no = p.delayd_no;
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}
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return (0);
|
||||
}
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void
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||||
noise()
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{
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||||
putchar('\07');
|
||||
fflush(stdout);
|
||||
}
|
||||
|
||||
int
|
||||
gettoken()
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||||
{
|
||||
while ((tval = getAChar()) == REDRAWTOKEN || tval == SHELLTOKEN)
|
||||
{
|
||||
if (tval == SHELLTOKEN)
|
||||
{
|
||||
#ifdef BSD
|
||||
struct itimerval itv;
|
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itv.it_value.tv_sec = 0;
|
||||
itv.it_value.tv_usec = 0;
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||||
setitimer(ITIMER_REAL, &itv, NULL);
|
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#endif
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#ifdef SYSV
|
||||
int aval;
|
||||
aval = alarm(0);
|
||||
#endif
|
||||
if (fork() == 0) /* child */
|
||||
{
|
||||
char *shell, *base;
|
||||
|
||||
done_screen();
|
||||
|
||||
/* run user's favorite shell */
|
||||
if ((shell = getenv("SHELL")) != NULL)
|
||||
{
|
||||
base = strrchr(shell, '/');
|
||||
if (base == NULL)
|
||||
base = shell;
|
||||
else
|
||||
base++;
|
||||
execl(shell, base, 0);
|
||||
}
|
||||
else
|
||||
execl(_PATH_BSHELL, "sh", 0);
|
||||
|
||||
exit(0); /* oops */
|
||||
}
|
||||
|
||||
wait(0);
|
||||
tcsetattr(fileno(stdin), TCSADRAIN, &tty_new);
|
||||
#ifdef BSD
|
||||
itv.it_value.tv_sec = 0;
|
||||
itv.it_value.tv_usec = 1;
|
||||
itv.it_interval.tv_sec = sp->update_secs;
|
||||
itv.it_interval.tv_usec = 0;
|
||||
setitimer(ITIMER_REAL, &itv, NULL);
|
||||
#endif
|
||||
#ifdef SYSV
|
||||
alarm(aval);
|
||||
#endif
|
||||
}
|
||||
redraw();
|
||||
}
|
||||
|
||||
if (isdigit(tval))
|
||||
return (NUMTOKEN);
|
||||
else if (isalpha(tval))
|
||||
return (ALPHATOKEN);
|
||||
else
|
||||
return (tval);
|
||||
}
|
||||
|
||||
const char *
|
||||
setplane(c)
|
||||
char c;
|
||||
{
|
||||
PLANE *pp;
|
||||
|
||||
pp = findplane(number(c));
|
||||
if (pp == NULL)
|
||||
return ("Unknown Plane");
|
||||
memcpy(&p, pp, sizeof (p));
|
||||
p.delayd = 0;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
turn(c)
|
||||
char c;
|
||||
{
|
||||
if (p.altitude == 0)
|
||||
return ("Planes at airports may not change direction");
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
circle(c)
|
||||
char c;
|
||||
{
|
||||
if (p.altitude == 0)
|
||||
return ("Planes cannot circle on the ground");
|
||||
p.new_dir = MAXDIR;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
left(c)
|
||||
char c;
|
||||
{
|
||||
dir = D_LEFT;
|
||||
p.new_dir = p.dir - 1;
|
||||
if (p.new_dir < 0)
|
||||
p.new_dir += MAXDIR;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
right(c)
|
||||
char c;
|
||||
{
|
||||
dir = D_RIGHT;
|
||||
p.new_dir = p.dir + 1;
|
||||
if (p.new_dir >= MAXDIR)
|
||||
p.new_dir -= MAXDIR;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
Left(c)
|
||||
char c;
|
||||
{
|
||||
p.new_dir = p.dir - 2;
|
||||
if (p.new_dir < 0)
|
||||
p.new_dir += MAXDIR;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
Right(c)
|
||||
char c;
|
||||
{
|
||||
p.new_dir = p.dir + 2;
|
||||
if (p.new_dir >= MAXDIR)
|
||||
p.new_dir -= MAXDIR;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
delayb(ch)
|
||||
char ch;
|
||||
{
|
||||
int xdiff, ydiff;
|
||||
unsigned char c;
|
||||
|
||||
c = ch - '0';
|
||||
|
||||
if (c >= sp->num_beacons)
|
||||
return ("Unknown beacon");
|
||||
xdiff = sp->beacon[(int)c].x - p.xpos;
|
||||
xdiff = SGN(xdiff);
|
||||
ydiff = sp->beacon[(int)c].y - p.ypos;
|
||||
ydiff = SGN(ydiff);
|
||||
if (xdiff != displacement[p.dir].dx || ydiff != displacement[p.dir].dy)
|
||||
return ("Beacon is not in flight path");
|
||||
p.delayd = 1;
|
||||
p.delayd_no = c;
|
||||
|
||||
if (dest_type != T_NODEST) {
|
||||
switch (dest_type) {
|
||||
case T_BEACON:
|
||||
xdiff = sp->beacon[dest_no].x - sp->beacon[(int)c].x;
|
||||
ydiff = sp->beacon[dest_no].y - sp->beacon[(int)c].y;
|
||||
break;
|
||||
case T_EXIT:
|
||||
xdiff = sp->exit[dest_no].x - sp->beacon[(int)c].x;
|
||||
ydiff = sp->exit[dest_no].y - sp->beacon[(int)c].y;
|
||||
break;
|
||||
case T_AIRPORT:
|
||||
xdiff = sp->airport[dest_no].x - sp->beacon[(int)c].x;
|
||||
ydiff = sp->airport[dest_no].y - sp->beacon[(int)c].y;
|
||||
break;
|
||||
default:
|
||||
return ("Bad case in delayb! Get help!");
|
||||
break;
|
||||
}
|
||||
if (xdiff == 0 && ydiff == 0)
|
||||
return ("Would already be there");
|
||||
p.new_dir = DIR_FROM_DXDY(xdiff, ydiff);
|
||||
if (p.new_dir == p.dir)
|
||||
return ("Already going in that direction");
|
||||
}
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
beacon(c)
|
||||
char c;
|
||||
{
|
||||
dest_type = T_BEACON;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
ex_it(c)
|
||||
char c;
|
||||
{
|
||||
dest_type = T_EXIT;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
airport(c)
|
||||
char c;
|
||||
{
|
||||
dest_type = T_AIRPORT;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
climb(c)
|
||||
char c;
|
||||
{
|
||||
dir = D_UP;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
descend(c)
|
||||
char c;
|
||||
{
|
||||
dir = D_DOWN;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
setalt(c)
|
||||
char c;
|
||||
{
|
||||
if ((p.altitude == c - '0') && (p.new_altitude == p.altitude))
|
||||
return ("Already at that altitude");
|
||||
p.new_altitude = c - '0';
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
setrelalt(c)
|
||||
char c;
|
||||
{
|
||||
if (c == 0)
|
||||
return ("altitude not changed");
|
||||
|
||||
switch (dir) {
|
||||
case D_UP:
|
||||
p.new_altitude = p.altitude + c - '0';
|
||||
break;
|
||||
case D_DOWN:
|
||||
p.new_altitude = p.altitude - (c - '0');
|
||||
break;
|
||||
default:
|
||||
return ("Unknown case in setrelalt! Get help!");
|
||||
break;
|
||||
}
|
||||
if (p.new_altitude < 0)
|
||||
return ("Altitude would be too low");
|
||||
else if (p.new_altitude > 9)
|
||||
return ("Altitude would be too high");
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
benum(ch)
|
||||
char ch;
|
||||
{
|
||||
unsigned char c;
|
||||
|
||||
dest_no = c = ch - '0';
|
||||
|
||||
switch (dest_type) {
|
||||
case T_BEACON:
|
||||
if (c >= sp->num_beacons)
|
||||
return ("Unknown beacon");
|
||||
p.new_dir = DIR_FROM_DXDY(sp->beacon[(int)c].x - p.xpos,
|
||||
sp->beacon[(int)c].y - p.ypos);
|
||||
break;
|
||||
case T_EXIT:
|
||||
if (c >= sp->num_exits)
|
||||
return ("Unknown exit");
|
||||
p.new_dir = DIR_FROM_DXDY(sp->exit[(int)c].x - p.xpos,
|
||||
sp->exit[(int)c].y - p.ypos);
|
||||
break;
|
||||
case T_AIRPORT:
|
||||
if (c >= sp->num_airports)
|
||||
return ("Unknown airport");
|
||||
p.new_dir = DIR_FROM_DXDY(sp->airport[(int)c].x - p.xpos,
|
||||
sp->airport[(int)c].y - p.ypos);
|
||||
break;
|
||||
default:
|
||||
return ("Unknown case in benum! Get help!");
|
||||
break;
|
||||
}
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
to_dir(c)
|
||||
char c;
|
||||
{
|
||||
p.new_dir = dir_no(c);
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
rel_dir(c)
|
||||
char c;
|
||||
{
|
||||
int angle;
|
||||
|
||||
angle = dir_no(c);
|
||||
switch (dir) {
|
||||
case D_LEFT:
|
||||
p.new_dir = p.dir - angle;
|
||||
if (p.new_dir < 0)
|
||||
p.new_dir += MAXDIR;
|
||||
break;
|
||||
case D_RIGHT:
|
||||
p.new_dir = p.dir + angle;
|
||||
if (p.new_dir >= MAXDIR)
|
||||
p.new_dir -= MAXDIR;
|
||||
break;
|
||||
default:
|
||||
return ("Bizarre direction in rel_dir! Get help!");
|
||||
break;
|
||||
}
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
mark(c)
|
||||
char c;
|
||||
{
|
||||
if (p.altitude == 0)
|
||||
return ("Cannot mark planes on the ground");
|
||||
if (p.status == S_MARKED)
|
||||
return ("Already marked");
|
||||
p.status = S_MARKED;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
unmark(c)
|
||||
char c;
|
||||
{
|
||||
if (p.altitude == 0)
|
||||
return ("Cannot unmark planes on the ground");
|
||||
if (p.status == S_UNMARKED)
|
||||
return ("Already unmarked");
|
||||
p.status = S_UNMARKED;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
const char *
|
||||
ignore(c)
|
||||
char c;
|
||||
{
|
||||
if (p.altitude == 0)
|
||||
return ("Cannot ignore planes on the ground");
|
||||
if (p.status == S_IGNORED)
|
||||
return ("Already ignored");
|
||||
p.status = S_IGNORED;
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
int
|
||||
dir_no(ch)
|
||||
char ch;
|
||||
{
|
||||
int dir;
|
||||
|
||||
dir = -1;
|
||||
switch (ch) {
|
||||
case 'w': dir = 0; break;
|
||||
case 'e': dir = 1; break;
|
||||
case 'd': dir = 2; break;
|
||||
case 'c': dir = 3; break;
|
||||
case 'x': dir = 4; break;
|
||||
case 'z': dir = 5; break;
|
||||
case 'a': dir = 6; break;
|
||||
case 'q': dir = 7; break;
|
||||
default:
|
||||
fprintf(stderr, "bad character in dir_no\n");
|
||||
break;
|
||||
}
|
||||
return (dir);
|
||||
}
|
||||
Reference in New Issue
Block a user