| 1 | /* $OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $ */
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| 2 | /* $NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $ */
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| 3 |
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| 4 | /*-
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| 5 | * Copyright (c) 1992, 1993
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| 6 | * The Regents of the University of California. All rights reserved.
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| 7 | *
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| 8 | * This code is derived from software contributed to Berkeley by
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| 9 | * Chris Torek and Darren F. Provine.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. Neither the name of the University nor the names of its contributors
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| 20 | * may be used to endorse or promote products derived from this software
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| 21 | * without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 33 | * SUCH DAMAGE.
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| 34 | *
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| 35 | * @(#)screen.c 8.1 (Berkeley) 5/31/93
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| 36 | */
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| 37 |
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| 38 | /*
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| 39 | * Tetris screen control.
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| 40 | */
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| 41 |
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| 42 | #include <err.h>
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| 43 | #include <stdio.h>
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| 44 | #include <stdlib.h>
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| 45 | #include <string.h>
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| 46 | #include <unistd.h>
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| 47 | #include <io/stream.h>
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| 48 |
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| 49 | #include "screen.h"
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| 50 | #include "tetris.h"
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| 51 |
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| 52 | static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */
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| 53 | static int curscore;
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| 54 | static int isset; /* true => terminal is in game mode */
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| 55 | static struct termios oldtt;
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| 56 | static void (*tstp)(int);
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| 57 |
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| 58 | static void scr_stop(int);
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| 59 | static void stopset(int);
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| 60 |
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| 61 | /*
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| 62 | * Capabilities from TERMCAP.
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| 63 | */
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| 64 | char PC, *BC, *UP; /* tgoto requires globals: ugh! */
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| 65 |
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| 66 | static char
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| 67 | *bcstr, /* backspace char */
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| 68 | *CEstr, /* clear to end of line */
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| 69 | *CLstr, /* clear screen */
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| 70 | *CMstr, /* cursor motion string */
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| 71 | #ifdef unneeded
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| 72 | *CRstr, /* "\r" equivalent */
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| 73 | #endif
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| 74 | *HOstr, /* cursor home */
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| 75 | *LLstr, /* last line, first column */
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| 76 | *pcstr, /* pad character */
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| 77 | *TEstr, /* end cursor motion mode */
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| 78 | *TIstr; /* begin cursor motion mode */
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| 79 | char
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| 80 | *SEstr, /* end standout mode */
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| 81 | *SOstr; /* begin standout mode */
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| 82 | static int
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| 83 | COnum, /* co# value */
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| 84 | LInum, /* li# value */
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| 85 | MSflag; /* can move in standout mode */
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| 86 |
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| 87 |
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| 88 | struct tcsinfo { /* termcap string info; some abbrevs above */
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| 89 | char tcname[3];
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| 90 | char **tcaddr;
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| 91 | } tcstrings[] = {
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| 92 | {"bc", &bcstr},
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| 93 | {"ce", &CEstr},
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| 94 | {"cl", &CLstr},
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| 95 | {"cm", &CMstr},
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| 96 | #ifdef unneeded
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| 97 | {"cr", &CRstr},
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| 98 | #endif
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| 99 | {"le", &BC}, /* move cursor left one space */
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| 100 | {"pc", &pcstr},
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| 101 | {"se", &SEstr},
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| 102 | {"so", &SOstr},
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| 103 | {"te", &TEstr},
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| 104 | {"ti", &TIstr},
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| 105 | {"up", &UP}, /* cursor up */
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| 106 | { {0}, NULL}
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| 107 | };
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| 108 |
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| 109 | /* This is where we will actually stuff the information */
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| 110 |
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| 111 | static char combuf[1024], tbuf[1024];
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| 112 |
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| 113 |
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| 114 | /*
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| 115 | * Routine used by tputs().
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| 116 | */
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| 117 | int
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| 118 | put(int c)
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| 119 | {
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| 120 |
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| 121 | return (putchar(c));
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| 122 | }
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| 123 |
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| 124 | /*
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| 125 | * putstr() is for unpadded strings (either as in termcap(5) or
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| 126 | * simply literal strings); putpad() is for padded strings with
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| 127 | * count=1. (See screen.h for putpad().)
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| 128 | */
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| 129 | #define putstr(s) (void)fputs(s, stdout)
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| 130 | #define moveto(r, c) putpad(tgoto(CMstr, c, r))
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| 131 |
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| 132 | static int con_phone;
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| 133 |
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| 134 | /*
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| 135 | * Set up from termcap.
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| 136 | */
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| 137 | void
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| 138 | scr_init(void)
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| 139 | {
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| 140 | con_phone = get_fd_phone(1);
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| 141 | }
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| 142 |
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| 143 |
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| 144 | static void
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| 145 | scr_stop(int sig)
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| 146 | {
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| 147 |
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| 148 | scr_end();
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| 149 | scr_set();
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| 150 | scr_msg(key_msg, 1);
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| 151 | }
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| 152 |
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| 153 | /*
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| 154 | * Set up screen mode.
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| 155 | */
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| 156 | void
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| 157 | scr_set(void)
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| 158 | {
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| 159 | struct winsize ws;
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| 160 | struct termios newtt;
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| 161 | void (*ttou)(int);
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| 162 |
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| 163 | Rows = 0, Cols = 0;
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| 164 | if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
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| 165 | Rows = ws.ws_row;
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| 166 | Cols = ws.ws_col;
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| 167 | }
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| 168 | if (Rows == 0)
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| 169 | Rows = LInum;
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| 170 | if (Cols == 0)
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| 171 | Cols = COnum;
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| 172 | if (Rows < MINROWS || Cols < MINCOLS) {
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| 173 | char smallscr[55];
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| 174 |
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| 175 | (void)snprintf(smallscr, sizeof(smallscr),
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| 176 | "the screen is too small (must be at least %dx%d)",
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| 177 | MINROWS, MINCOLS);
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| 178 | stop(smallscr);
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| 179 | }
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| 180 | if (tcgetattr(0, &oldtt) < 0)
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| 181 | stop("tcgetattr() fails");
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| 182 | newtt = oldtt;
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| 183 | newtt.c_lflag &= ~(ICANON|ECHO);
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| 184 | newtt.c_oflag &= ~OXTABS;
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| 185 | if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
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| 186 | stop("tcsetattr() fails");
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| 187 |
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| 188 | /*
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| 189 | * We made it. We are now in screen mode, modulo TIstr
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| 190 | * (which we will fix immediately).
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| 191 | */
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| 192 | if (TIstr)
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| 193 | putstr(TIstr); /* termcap(5) says this is not padded */
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| 194 |
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| 195 | isset = 1;
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| 196 |
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| 197 | scr_clear();
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| 198 | }
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| 199 |
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| 200 | /*
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| 201 | * End screen mode.
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| 202 | */
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| 203 | void
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| 204 | scr_end(void)
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| 205 | {
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| 206 | }
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| 207 |
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| 208 | void
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| 209 | stop(char *why)
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| 210 | {
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| 211 |
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| 212 | if (isset)
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| 213 | scr_end();
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| 214 | errx(1, "aborting: %s", why);
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| 215 | }
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| 216 |
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| 217 | /*
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| 218 | * Clear the screen, forgetting the current contents in the process.
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| 219 | */
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| 220 | void
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| 221 | scr_clear(void)
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| 222 | {
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| 223 |
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| 224 | putpad(CLstr);
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| 225 | curscore = -1;
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| 226 | memset((char *)curscreen, 0, sizeof(curscreen));
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| 227 | }
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| 228 |
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| 229 | #if vax && !__GNUC__
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| 230 | typedef int regcell; /* pcc is bad at `register char', etc */
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| 231 | #else
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| 232 | typedef cell regcell;
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| 233 | #endif
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| 234 |
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| 235 | /*
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| 236 | * Update the screen.
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| 237 | */
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| 238 | void
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| 239 | scr_update(void)
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| 240 | {
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| 241 | cell *bp, *sp;
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| 242 | regcell so, cur_so = 0;
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| 243 | int i, ccol, j;
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| 244 | static const struct shape *lastshape;
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| 245 |
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| 246 | /* always leave cursor after last displayed point */
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| 247 | curscreen[D_LAST * B_COLS - 1] = -1;
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| 248 |
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| 249 | if (score != curscore) {
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| 250 | if (HOstr)
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| 251 | putpad(HOstr);
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| 252 | else
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| 253 | moveto(0, 0);
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| 254 | (void) printf("Score: %d", score);
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| 255 | curscore = score;
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| 256 | }
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| 257 |
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| 258 | /* draw preview of next pattern */
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| 259 | if (showpreview && (nextshape != lastshape)) {
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| 260 | int i;
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| 261 | static int r=5, c=2;
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| 262 | int tr, tc, t;
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| 263 |
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| 264 | lastshape = nextshape;
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| 265 |
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| 266 | /* clean */
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| 267 | putpad(SEstr);
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| 268 | moveto(r-1, c-1); putstr(" ");
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| 269 | moveto(r, c-1); putstr(" ");
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| 270 | moveto(r+1, c-1); putstr(" ");
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| 271 | moveto(r+2, c-1); putstr(" ");
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| 272 |
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| 273 | moveto(r-3, c-2);
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| 274 | putstr("Next shape:");
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| 275 |
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| 276 | /* draw */
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| 277 | if (SOstr)
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| 278 | putpad(SOstr);
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| 279 | moveto(r, 2 * c);
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| 280 | putstr(SOstr ? " " : "[]");
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| 281 | for (i = 0; i < 3; i++) {
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| 282 | t = c + r * B_COLS;
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| 283 | t += nextshape->off[i];
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| 284 |
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| 285 | tr = t / B_COLS;
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| 286 | tc = t % B_COLS;
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| 287 |
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| 288 | moveto(tr, 2*tc);
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| 289 | putstr(SOstr ? " " : "[]");
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| 290 | }
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| 291 | putpad(SEstr);
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| 292 | }
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| 293 |
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| 294 | bp = &board[D_FIRST * B_COLS];
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| 295 | sp = &curscreen[D_FIRST * B_COLS];
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| 296 | for (j = D_FIRST; j < D_LAST; j++) {
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| 297 | ccol = -1;
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| 298 | for (i = 0; i < B_COLS; bp++, sp++, i++) {
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| 299 | if (*sp == (so = *bp))
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| 300 | continue;
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| 301 | *sp = so;
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| 302 | if (i != ccol) {
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| 303 | if (cur_so && MSflag) {
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| 304 | putpad(SEstr);
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| 305 | cur_so = 0;
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| 306 | }
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| 307 | moveto(RTOD(j), CTOD(i));
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| 308 | }
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| 309 | if (SOstr) {
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| 310 | if (so != cur_so) {
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| 311 | putpad(so ? SOstr : SEstr);
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| 312 | cur_so = so;
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| 313 | }
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| 314 | putstr(" ");
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| 315 | } else
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| 316 | putstr(so ? "[]" : " ");
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| 317 | ccol = i + 1;
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| 318 | /*
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| 319 | * Look ahead a bit, to avoid extra motion if
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| 320 | * we will be redrawing the cell after the next.
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| 321 | * Motion probably takes four or more characters,
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| 322 | * so we save even if we rewrite two cells
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| 323 | * `unnecessarily'. Skip it all, though, if
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| 324 | * the next cell is a different color.
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| 325 | */
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| 326 | #define STOP (B_COLS - 3)
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| 327 | if (i > STOP || sp[1] != bp[1] || so != bp[1])
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| 328 | continue;
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| 329 | if (sp[2] != bp[2])
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| 330 | sp[1] = -1;
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| 331 | else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
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| 332 | sp[2] = -1;
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| 333 | sp[1] = -1;
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| 334 | }
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| 335 | }
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| 336 | }
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| 337 | if (cur_so)
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| 338 | putpad(SEstr);
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| 339 | /* (void) fflush(stdout); */
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| 340 | /* (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); */
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| 341 | }
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| 342 |
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| 343 | /*
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| 344 | * Write a message (set!=0), or clear the same message (set==0).
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| 345 | * (We need its length in case we have to overwrite with blanks.)
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| 346 | */
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| 347 | void
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| 348 | scr_msg(char *s, int set)
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| 349 | {
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| 350 |
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| 351 | if (set || CEstr == NULL) {
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| 352 | int l = strlen(s);
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| 353 |
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| 354 | moveto(Rows - 2, ((Cols - l) >> 1) - 1);
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| 355 | if (set)
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| 356 | putstr(s);
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| 357 | else
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| 358 | while (--l >= 0)
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| 359 | (void) putchar(' ');
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| 360 | } else {
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| 361 | moveto(Rows - 2, 0);
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| 362 | putpad(CEstr);
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| 363 | }
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| 364 | }
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