Use POSIX signal and tty semantics.

diff --git a/tetris/screen.c b/tetris/screen.c
index 852a4e440a52487348b963374ba01aa58c325070..290b0852bae1fadf25b4638fe533af8d60987db8 100644 (file)
--- a/tetris/screen.c
+++ b/tetris/screen.c
@@ -1,4 +1,4 @@
-/*     $NetBSD: screen.c,v 1.2 1995/04/22 07:42:41 cgd Exp $   */
+/*     $NetBSD: screen.c,v 1.3 1995/04/28 22:09:25 mycroft Exp $       */
 
 /*-
  * Copyright (c) 1992, 1993
@@ -42,7 +42,6 @@
  * Tetris screen control.
  */
 
-#include <sgtty.h>
 #include <sys/ioctl.h>
 
 #include <setjmp.h>
@@ -50,6 +49,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <termios.h>
 #include <unistd.h>
 
 #ifndef sigmask
@@ -70,7 +70,7 @@ int   tputs __P((const char *, int, int (*)(int)));
 static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */
 static int curscore;
 static int isset;              /* true => terminal is in game mode */
-static struct sgttyb oldtt;
+static struct termios oldtt;
 static void (*tstp)();
 
 char   *tgetstr(), *tgoto();
@@ -219,24 +219,31 @@ scr_init()
 /* this foolery is needed to modify tty state `atomically' */
 static jmp_buf scr_onstop;
 
-#define        sigunblock(mask) sigsetmask(sigblock(0) & ~(mask))
-
 static void
 stopset(sig)
        int sig;
 {
+       sigset_t sigset;
+
        (void) signal(sig, SIG_DFL);
        (void) kill(getpid(), sig);
-       (void) sigunblock(sigmask(sig));
+       sigemptyset(&sigset);
+       sigaddset(&sigset, sig);
+       (void) sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *)0);
        longjmp(scr_onstop, 1);
 }
 
 static void
-scr_stop()
+scr_stop(sig)
+       int sig;
 {
+       sigset_t sigset;
+
        scr_end();
-       (void) kill(getpid(), SIGTSTP);
-       (void) sigunblock(sigmask(SIGTSTP));
+       (void) kill(getpid(), sig);
+       sigemptyset(&sigset);
+       sigaddset(&sigset, sig);
+       (void) sigprocmask(SIG_UNBLOCK, &sigset, (sigset_t *)0);
        scr_set();
        scr_msg(key_msg, 1);
 }
@@ -248,22 +255,25 @@ void
 scr_set()
 {
        struct winsize ws;
-       struct sgttyb newtt;
-       volatile int omask;
+       struct termios newtt;
+       sigset_t sigset, osigset;
        void (*ttou)();
 
-       omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
+       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(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) sigsetmask(omask);
+       (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
        Rows = 0, Cols = 0;
        if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
                Rows = ws.ws_row;
@@ -279,16 +289,15 @@ scr_set()
                    MINROWS, MINCOLS);
                stop("");       /* stop() supplies \n */
        }
-       if (ioctl(0, TIOCGETP, &oldtt))
-               stop("ioctl(TIOCGETP) fails");
+       if (tcgetattr(0, &oldtt) < 0)
+               stop("tcgetattr() fails");
        newtt = oldtt;
-       newtt.sg_flags = (newtt.sg_flags | CBREAK) & ~(CRMOD | ECHO);
-       if ((newtt.sg_flags & TBDELAY) == XTABS)
-               newtt.sg_flags &= ~TBDELAY;
-       if (ioctl(0, TIOCSETN, &newtt))
-               stop("ioctl(TIOCSETN) fails");
-       ospeed = newtt.sg_ospeed;
-       omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
+       newtt.c_lflag &= ~(ICANON|ECHO);
+       newtt.c_oflag &= ~OXTABS;
+       if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
+               stop("tcsetattr() fails");
+       ospeed = cfgetospeed(&newtt);
+       (void) sigprocmask(SIG_BLOCK, &sigset, &osigset);
 
        /*
         * We made it.  We are now in screen mode, modulo TIstr
@@ -298,10 +307,11 @@ scr_set()
                putstr(TIstr);  /* termcap(5) says this is not padded */
        if (tstp != SIG_IGN)
                (void) signal(SIGTSTP, scr_stop);
-       (void) signal(SIGTTOU, ttou);
+       if (ttou != SIG_IGN)
+               (void) signal(SIGTTOU, ttou);
 
        isset = 1;
-       (void) sigsetmask(omask);
+       (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
        scr_clear();
 }
 
@@ -311,8 +321,12 @@ scr_set()
 void
 scr_end()
 {
-       int omask = sigblock(sigmask(SIGTSTP) | sigmask(SIGTTOU));
+       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 */
@@ -322,11 +336,11 @@ scr_end()
        if (TEstr)
                putstr(TEstr);  /* termcap(5) says this is not padded */
        (void) fflush(stdout);
-       (void) ioctl(0, TIOCSETN, &oldtt);
+       (void) tcsetattr(0, TCSADRAIN, &oldtt);
        isset = 0;
        /* restore signals */
        (void) signal(SIGTSTP, tstp);
-       (void) sigsetmask(omask);
+       (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 }
 
 void
@@ -367,7 +381,11 @@ scr_update()
        register cell *bp, *sp;
        register regcell so, cur_so = 0;
        register int i, ccol, j;
-       int omask = sigblock(sigmask(SIGTSTP));
+       sigset_t sigset, osigset;
+
+       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;
@@ -427,7 +445,7 @@ scr_update()
        if (cur_so)
                putpad(SEstr);
        (void) fflush(stdout);
-       (void) sigsetmask(omask);
+       (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
 }
 
 /*