element-lists/names-2.0.1/src/keyb.c

   1 /*---------------------------------------------------------------------
   2  * Borrowed from chin.c v1.1, written by Davor Slamnig, 6/94          *
   3  * Modified by Michael Harvey 8/94                                    *
   4  *                                                                    *
   5  *  Single character keyboard input on UNIX in three modes:           *
   6  *                                                                    *
   7  *  wait    - getchar() blocks until a character is read.             *
   8  *  nowait  - getchar() returns immediately, -1 is returned           *
   9  *                      if there are no characters in queue.          *
  10  *  timeout - getchar() blocks until a character is read,             *
  11  *                      or a specified time limit is exceeded.        *
  12  *                                                                    *
  13  *      vidsetup(1, 0);           /* wait    * /                      *
  14  *      vidsetup(0, 0);           /* nowait  * /                      *
  15  *      vidsetup(0, V_TIMEOUT);   /* timeout * /                      *
  16  *                                                                    *
  17  *      vidsave();                /* save terminal           * /      *
  18  *      vidreset();               /* restore normal settings * /      *
  19  *                                                                    *
  20  *      kb_init();                /* init kb mode            * /      *
  21  *      kb_done();                /* reset kb mode           * /      *
  22  *      kb_shell();               /* shell mode              * /      *
  23  *                                                                    *
  24  *      kb_wait();                /* wait mode               * /      *
  25  *      kb_nowait();              /* nowait mode             * /      *
  26  *      kb_timeout();             /* timeout mode            * /      *
  27  *                                                                    *
  28  *  See termio(7)                                                     *
  29  ---------------------------------------------------------------------*/
  30
  31 #include <stdio.h>
  32 #include <termio.h>
  33 #include "keyb.h"
  34
  35 #define V_TIMEOUT       10      /* 1 second */
  36
  37 struct termio Savevid;
  38
  39 void vid_save(vmin, vtime)
  40 {
  41         if(ioctl(0, TCGETA, &Savevid) == -1)
  42         {
  43                 perror("vidsave failed");
  44                 return;
  45         }
  46 }
  47
  48 void vid_setup(vmin, vtime)
  49 int vmin, vtime;
  50 {
  51         static struct termio newvid; /* must be static or global */
  52
  53         if(ioctl(0, TCGETA, &newvid) == -1)
  54         {
  55                 perror("TCGETA failed");
  56                 return;
  57         }
  58
  59         newvid.c_lflag = (newvid.c_lflag & ~ICANON & ~ECHO);
  60         newvid.c_cc[VMIN] = vmin;
  61         newvid.c_cc[VTIME] = vtime;
  62
  63         if(ioctl(0, TCSETA, &newvid) == -1)
  64         {
  65                 perror("vidsetup failed");
  66                 return;
  67         }
  68 }
  69
  70 void vid_reset()
  71 {
  72         if(ioctl(0, TCSETA, &Savevid) == -1)
  73         {
  74                 perror("vidreset failed");
  75                 return;
  76         }
  77 }
  78
  79 void vid_wait()
  80 {
  81         /* wait mode    - getchar() blocks until a character is read. */
  82
  83         vid_setup(1, 0);
  84 }
  85
  86 void vid_nowait()
  87 {
  88         /* nowait mode  - getchar() returns immediately, -1 is returned. */
  89         /*                if there are no characters in queue.           */
  90
  91         vid_setup(0, 0);
  92 }
  93
  94 void vid_timeout()
  95 {
  96         /* timeout mode - getchar() blocks until a character is read, */
  97         /*                or a specified time limit is exceeded.      */
  98
  99         vid_setup(0, V_TIMEOUT);
 100 }
 101
 102 void kb_init()     { vid_save(0,0); }
 103 void kb_done()     { vid_reset(); }
 104 void kb_shell()    { vid_reset(); }
 105 void kb_wait()     { vid_wait(); }
 106 void kb_nowait()   { vid_nowait(); }
 107 void kb_timeout()  { vid_timeout(); }
 108