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/*  $OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $ */

/*  $NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $   */

/*-

 * Copyright (c) 1992, 1993

 *  The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek and Darren F. Provine.

 *

 * 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. 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.

 *

 *  @(#)screen.c    8.1 (Berkeley) 5/31/93

 */

/*

 * Tetris screen control.

 */

#include <sys/ioctl.h>

#include <err.h>

//#include <setjmp.h>

//#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <term.h>

#include <termios.h>

#include <unistd.h>

#include "screen.h"

#include "tetris.h"

static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */

static int curscore;

static int isset;       /* true => terminal is in game mode */

static struct termios oldtt;

static void (*tstp)(int);

static void scr_stop(int);

static void stopset(int);

/*

 * Capabilities from TERMCAP.

 */

char    PC, *BC, *UP;       /* tgoto requires globals: ugh! */

static char

    *bcstr,         /* backspace char */

    *CEstr,         /* clear to end of line */

    *CLstr,         /* clear screen */

    *CMstr,         /* cursor motion string */

#ifdef unneeded

    *CRstr,         /* "\r" equivalent */

#endif

    *HOstr,         /* cursor home */

    *LLstr,         /* last line, first column */

    *pcstr,         /* pad character */

    *TEstr,         /* end cursor motion mode */

    *TIstr;         /* begin cursor motion mode */

char

    *SEstr,         /* end standout mode */

    *SOstr;         /* begin standout mode */

static int

    COnum,          /* co# value */

    LInum,          /* li# value */

    MSflag;         /* can move in standout mode */

struct tcsinfo {        /* termcap string info; some abbrevs above */

    char tcname[3];

    char **tcaddr;

} tcstrings[] = {

    {"bc", &bcstr},

    {"ce", &CEstr},

    {"cl", &CLstr},

    {"cm", &CMstr},

#ifdef unneeded

    {"cr", &CRstr},

#endif

    {"le", &BC},        /* move cursor left one space */

    {"pc", &pcstr},

    {"se", &SEstr},

    {"so", &SOstr},

    {"te", &TEstr},

    {"ti", &TIstr},

    {"up", &UP},        /* cursor up */

    { {0}, NULL}

};

/* This is where we will actually stuff the information */

static char combuf[1024], tbuf[1024];

/*

 * Routine used by tputs().

 */

int

put(int c)

{

    return (putchar(c));

}

/*

 * putstr() is for unpadded strings (either as in termcap(5) or

 * simply literal strings); putpad() is for padded strings with

 * count=1.  (See screen.h for putpad().)

 */

#define putstr(s)   (void)fputs(s, stdout)

#define moveto(r, c)    putpad(tgoto(CMstr, c, r))

/*

 * Set up from termcap.

 */

void

scr_init(void)

{

    static int bsflag, xsflag, sgnum;

#ifdef unneeded

    static int ncflag;

#endif

    char *term, *fill;

    static struct tcninfo { /* termcap numeric and flag info */

        char tcname[3];

        int *tcaddr;

    } tcflags[] = {

        {"bs", &bsflag},

        {"ms", &MSflag},

#ifdef unneeded

        {"nc", &ncflag},

#endif

        {"xs", &xsflag},

        { {0}, NULL}

    }, tcnums[] = {

        {"co", &COnum},

        {"li", &LInum},

        {"sg", &sgnum},

        { {0}, NULL}

    };

    if ((term = getenv("TERM")) == NULL)

        stop("you must set the TERM environment variable");

    if (tgetent(tbuf, term) <= 0)

        stop("cannot find your termcap");

    fill = combuf;

    {

        struct tcsinfo *p;

        for (p = tcstrings; p->tcaddr; p++)

            *p->tcaddr = tgetstr(p->tcname, &fill);

    }

    if (classic)

        SOstr = SEstr = NULL;

    {

        struct tcninfo *p;

        for (p = tcflags; p->tcaddr; p++)

            *p->tcaddr = tgetflag(p->tcname);

        for (p = tcnums; p->tcaddr; p++)

            *p->tcaddr = tgetnum(p->tcname);

    }

    if (bsflag)

        BC = "\b";

    else if (BC == NULL && bcstr != NULL)

        BC = bcstr;

    if (CLstr == NULL)

        stop("cannot clear screen");

    if (CMstr == NULL || UP == NULL || BC == NULL)

        stop("cannot do random cursor positioning via tgoto()");

    PC = pcstr ? *pcstr : 0;

    if (sgnum > 0 || xsflag)

        SOstr = SEstr = NULL;

#ifdef unneeded

    if (ncflag)

        CRstr = NULL;

    else if (CRstr == NULL)

        CRstr = "\r";

#endif

}

/* this foolery is needed to modify tty state `atomically' */

//static jmp_buf scr_onstop;

/* static void */

/* stopset(int sig) */

/* { */

/*  sigset_t sigset; */

/*  (void) signal(sig, SIG_DFL); */

/*  (void) kill(getpid(), sig); */

/*  sigemptyset(&sigset); */

/*  sigaddset(&sigset, sig); */

/*  (void) sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *)0); */

/*  longjmp(scr_onstop, 1); */

/* } */

static void

scr_stop(int sig)

{

//  sigset_t sigset;

    scr_end();

/*  (void) kill(getpid(), sig); */

/*  sigemptyset(&sigset); */

/*  sigaddset(&sigset, sig); */

/*  (void) sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *)0); */

    scr_set();

    scr_msg(key_msg, 1);

}

/*

 * Set up screen mode.

 */

void

scr_set(void)

{

    struct winsize ws;

    struct termios newtt;

//  sigset_t sigset, osigset;

    void (*ttou)(int);

/*  sigemptyset(&sigset); */

/*  sigaddset(&sigset, SIGTSTP); */

/*  sigaddset(&sigset, SIGTTOU); */

/*  (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); */

/*  if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN) */

/*      (void) signal(SIGTSTP, SIG_IGN); */

/*  if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN) */

/*      (void) signal(SIGTTOU, SIG_IGN); */

/*  /\* */

/*   * At last, we are ready to modify the tty state.  If */

/*   * we stop while at it, stopset() above will longjmp back */

/*   * to the setjmp here and we will start over. */

/*   *\/ */

/*  (void) setjmp(scr_onstop); */

/*  (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); */

    Rows = 0, Cols = 0;

    if (ioctl(0, TIOCGWINSZ, &ws) == 0) {

        Rows = ws.ws_row;

        Cols = ws.ws_col;

    }

    if (Rows == 0)

        Rows = LInum;

    if (Cols == 0)

    Cols = COnum;

    if (Rows < MINROWS || Cols < MINCOLS) {

        char smallscr[55];

        (void)snprintf(smallscr, sizeof(smallscr),

            "the screen is too small (must be at least %dx%d)",

            MINROWS, MINCOLS);

        stop(smallscr);

    }

    if (tcgetattr(0, &oldtt) < 0)

        stop("tcgetattr() fails");

    newtt = oldtt;

    newtt.c_lflag &= ~(ICANON|ECHO);

    newtt.c_oflag &= ~OXTABS;

    if (tcsetattr(0, TCSADRAIN, &newtt) < 0)

        stop("tcsetattr() fails");

/*  (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); */

    /*

     * We made it.  We are now in screen mode, modulo TIstr

     * (which we will fix immediately).

     */

    if (TIstr)

        putstr(TIstr);  /* termcap(5) says this is not padded */

/*  if (tstp != SIG_IGN) */

/*      (void) signal(SIGTSTP, scr_stop); */

/*  if (ttou != SIG_IGN) */

/*      (void) signal(SIGTTOU, ttou); */

    isset = 1;

//  (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);

    scr_clear();

}

/*

 * End screen mode.

 */

void

scr_end(void)

{

//  sigset_t sigset, osigset;

/*  sigemptyset(&sigset); */

/*  sigaddset(&sigset, SIGTSTP); */

/*  sigaddset(&sigset, SIGTTOU); */

/*  (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); */

    /* move cursor to last line */

    if (LLstr)

        putstr(LLstr);  /* termcap(5) says this is not padded */

    else

        moveto(Rows - 1, 0);

    /* exit screen mode */

    if (TEstr)

        putstr(TEstr);  /* termcap(5) says this is not padded */

//  (void) fflush(stdout);

    (void) tcsetattr(0, TCSADRAIN, &oldtt);

    isset = 0;

    /* restore signals */

/*  (void) signal(SIGTSTP, tstp); */

/*  (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); */

}

void

stop(char *why)

{

    if (isset)

        scr_end();

    errx(1, "aborting: %s", why);

}

/*

 * Clear the screen, forgetting the current contents in the process.

 */

void

scr_clear(void)

{

    putpad(CLstr);

    curscore = -1;

    memset((char *)curscreen, 0, sizeof(curscreen));

}

#if vax && !__GNUC__

typedef int regcell;    /* pcc is bad at `register char', etc */

#else

typedef cell regcell;

#endif

/*

 * Update the screen.

 */

void

scr_update(void)

{

    cell *bp, *sp;

    regcell so, cur_so = 0;

    int i, ccol, j;

//  sigset_t sigset, osigset;

    static const struct shape *lastshape;

/*  sigemptyset(&sigset); */

/*  sigaddset(&sigset, SIGTSTP); */

/*  (void) sigprocmask(SIG_BLOCK, &sigset, &osigset); */

    /* always leave cursor after last displayed point */

    curscreen[D_LAST * B_COLS - 1] = -1;

    if (score != curscore) {

        if (HOstr)

            putpad(HOstr);

        else

            moveto(0, 0);

        (void) printf("Score: %d", score);

        curscore = score;

    }

    /* draw preview of next pattern */

    if (showpreview && (nextshape != lastshape)) {

        int i;

        static int r=5, c=2;

        int tr, tc, t;

        lastshape = nextshape;

        /* clean */

        putpad(SEstr);

        moveto(r-1, c-1); putstr("          ");

        moveto(r,   c-1); putstr("          ");

        moveto(r+1, c-1); putstr("          ");

        moveto(r+2, c-1); putstr("          ");

        moveto(r-3, c-2);

        putstr("Next shape:");

        /* draw */

        if (SOstr)

            putpad(SOstr);

        moveto(r, 2 * c);

        putstr(SOstr ? "  " : "[]");

        for (i = 0; i < 3; i++) {

            t = c + r * B_COLS;

            t += nextshape->off[i];

            tr = t / B_COLS;

            tc = t % B_COLS;

            moveto(tr, 2*tc);

            putstr(SOstr ? "  " : "[]");

        }

        putpad(SEstr);

    }

    bp = &board[D_FIRST * B_COLS];

    sp = &curscreen[D_FIRST * B_COLS];

    for (j = D_FIRST; j < D_LAST; j++) {

        ccol = -1;

        for (i = 0; i < B_COLS; bp++, sp++, i++) {

            if (*sp == (so = *bp))

                continue;

            *sp = so;

            if (i != ccol) {

                if (cur_so && MSflag) {

                    putpad(SEstr);

                    cur_so = 0;

                }

                moveto(RTOD(j), CTOD(i));

            }

            if (SOstr) {

                if (so != cur_so) {

                    putpad(so ? SOstr : SEstr);

                    cur_so = so;

                }

                putstr("  ");

            } else

                putstr(so ? "[]" : "  ");

            ccol = i + 1;

            /*

             * Look ahead a bit, to avoid extra motion if

             * we will be redrawing the cell after the next.

             * Motion probably takes four or more characters,

             * so we save even if we rewrite two cells

             * `unnecessarily'.  Skip it all, though, if

             * the next cell is a different color.

             */

#define STOP (B_COLS - 3)

            if (i > STOP || sp[1] != bp[1] || so != bp[1])

                continue;

            if (sp[2] != bp[2])

                sp[1] = -1;

            else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {

                sp[2] = -1;

                sp[1] = -1;

            }

        }

    }

    if (cur_so)

        putpad(SEstr);

/*  (void) fflush(stdout); */

/*  (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0); */

}

/*

 * Write a message (set!=0), or clear the same message (set==0).

 * (We need its length in case we have to overwrite with blanks.)

 */

void

scr_msg(char *s, int set)

{

    if (set || CEstr == NULL) {

        int l = strlen(s);

        moveto(Rows - 2, ((Cols - l) >> 1) - 1);

        if (set)

            putstr(s);

        else

            while (--l >= 0)

                (void) putchar(' ');

    } else {

        moveto(Rows - 2, 0);

        putpad(CEstr);

    }

}