sys/src/libdraw/keyboard.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include <thread.h>
   5 #include <keyboard.h>
   6
   7 void
   8 closekeyboard(Keyboardctl *kc)
   9 {
  10         if(kc == nil)
  11                 return;
  12         close(kc->ctlfd);
  13         close(kc->consfd);
  14         kc->consfd = kc->ctlfd = -1;
  15         threadint(kc->pid);
  16 }
  17
  18 static
  19 void
  20 _ioproc(void *arg)
  21 {
  22         int m, n;
  23         char buf[20];
  24         Rune r;
  25         Keyboardctl *kc;
  26
  27         kc = arg;
  28         threadsetname("kbdproc");
  29         n = 0;
  30 loop:
  31         while(kc->consfd >= 0){
  32                 while(n>0 && fullrune(buf, n)){
  33                         m = chartorune(&r, buf);
  34                         n -= m;
  35                         memmove(buf, buf+m, n);
  36                         if(send(kc->c, &r) < 0)
  37                                 goto loop;
  38                 }
  39                 if((m = read(kc->consfd, buf+n, sizeof buf-n)) <= 0)
  40                         goto loop;
  41                 n += m;
  42         }
  43         chanfree(kc->c);
  44         free(kc->file);
  45         free(kc);
  46 }
  47
  48 Keyboardctl*
  49 initkeyboard(char *file)
  50 {
  51         Keyboardctl *kc;
  52         char *t;
  53
  54         kc = mallocz(sizeof(Keyboardctl), 1);
  55         if(kc == nil)
  56                 return nil;
  57         if(file == nil)
  58                 file = "/dev/cons";
  59         kc->file = strdup(file);
  60         kc->consfd = open(file, ORDWR|OCEXEC);
  61         t = malloc(strlen(file)+16);
  62         if(kc->consfd<0 || t==nil){
  63 Error1:
  64                 free(kc);
  65                 return nil;
  66         }
  67         sprint(t, "%sctl", file);
  68         kc->ctlfd = open(t, OWRITE|OCEXEC);
  69         if(kc->ctlfd < 0){
  70                 fprint(2, "initkeyboard: can't open %s: %r\n", t);
  71 Error2:
  72                 close(kc->consfd);
  73                 free(t);
  74                 goto Error1;
  75         }
  76         if(ctlkeyboard(kc, "rawon") < 0){
  77                 fprint(2, "initkeyboard: can't turn on raw mode on %s: %r\n", t);
  78                 close(kc->ctlfd);
  79                 goto Error2;
  80         }
  81         free(t);
  82         kc->c = chancreate(sizeof(Rune), 20);
  83         kc->pid = proccreate(_ioproc, kc, 4096);
  84         return kc;
  85 }
  86
  87 int
  88 ctlkeyboard(Keyboardctl *kc, char *m)
  89 {
  90         return write(kc->ctlfd, m, strlen(m));
  91 }