3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*

  23  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25 
  26 /*      Copyright (c) 1988 AT&T     */
  27 /*        All Rights Reserved   */
  28 
  29 /*
  30  *      cscope - interactive C symbol cross-reference
  31  *
  32  *      terminal input functions
  33  */
  34 
  35 #include "global.h"
  36 #include <curses.h>       /* KEY_BACKSPACE, KEY_BREAK, and KEY_ENTER */
  37 #include <setjmp.h>       /* jmp_buf */
  38 
  39 static  jmp_buf env;            /* setjmp/longjmp buffer */
  40 static  int     prevchar;       /* previous, ungotten character */
  41 
  42 /* catch the interrupt signal */

  46 catchint(int sig)
  47 {
  48         (void) signal(SIGINT, catchint);
  49         longjmp(env, 1);
  50 }
  51 
  52 /* unget a character */
  53 
  54 int
  55 ungetch(int c)
  56 {
  57         prevchar = c;
  58         return (0);
  59 }
  60 
  61 /* get a character from the terminal */
  62 
  63 int
  64 mygetch(void)
  65 {
  66         SIGTYPE (*savesig)();           /* old value of signal */
  67         int     c;
  68 
  69         /* change an interrupt signal to a break key character */
  70         if (setjmp(env) == 0) {
  71                 savesig = signal(SIGINT, catchint);
  72                 (void) refresh();       /* update the display */
  73                 reinitmouse();  /* curses can change the menu number */
  74                 if (prevchar) {
  75                         c = prevchar;
  76                         prevchar = 0;
  77                 } else {
  78                         c = getch();    /* get a character from the terminal */
  79                 }
  80         } else {        /* longjmp to here from signal handler */
  81                 c = KEY_BREAK;
  82         }
  83         (void) signal(SIGINT, savesig);
  84         return (c);
  85 }
  86 

   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2015 Gary Mills
  24  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  25  */
  26 
  27 /*      Copyright (c) 1988 AT&T     */
  28 /*        All Rights Reserved   */
  29 
  30 /*
  31  *      cscope - interactive C symbol cross-reference
  32  *
  33  *      terminal input functions
  34  */
  35 
  36 #include "global.h"
  37 #include <curses.h>       /* KEY_BACKSPACE, KEY_BREAK, and KEY_ENTER */
  38 #include <setjmp.h>       /* jmp_buf */
  39 
  40 static  jmp_buf env;            /* setjmp/longjmp buffer */
  41 static  int     prevchar;       /* previous, ungotten character */
  42 
  43 /* catch the interrupt signal */

  47 catchint(int sig)
  48 {
  49         (void) signal(SIGINT, catchint);
  50         longjmp(env, 1);
  51 }
  52 
  53 /* unget a character */
  54 
  55 int
  56 ungetch(int c)
  57 {
  58         prevchar = c;
  59         return (0);
  60 }
  61 
  62 /* get a character from the terminal */
  63 
  64 int
  65 mygetch(void)
  66 {
  67         SIGTYPE (*volatile savesig)() = SIG_DFL; /* old value of signal */
  68         int     c;
  69 
  70         /* change an interrupt signal to a break key character */
  71         if (setjmp(env) == 0) {
  72                 savesig = signal(SIGINT, catchint);
  73                 (void) refresh();       /* update the display */
  74                 reinitmouse();  /* curses can change the menu number */
  75                 if (prevchar) {
  76                         c = prevchar;
  77                         prevchar = 0;
  78                 } else {
  79                         c = getch();    /* get a character from the terminal */
  80                 }
  81         } else {        /* longjmp to here from signal handler */
  82                 c = KEY_BREAK;
  83         }
  84         (void) signal(SIGINT, savesig);
  85         return (c);
  86 }
  87