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PDP11: Avoid console input buffer overrun when polling for new console input

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This commit is contained in:
Mark Pizzolato 2015-03-27 04:11:53 -07:00
parent 4da7f5e028
commit cc442a85cc
1 changed files with 6 additions and 0 deletions
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6
PDP11/pdp11_stddev.c
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@ -75,6 +75,7 @@ extern int32 int_req[IPL_HLVL];
extern uint32 cpu_type;
int32 tti_csr = 0; /* control/status */
uint32 tti_buftime; /* time input character arrived */
int32 tto_csr = 0; /* control/status */
int32 clk_csr = 0; /* control/status */
int32 clk_tps = 60; /* ticks/second */
@ -293,11 +294,16 @@ t_stat tti_svc (UNIT *uptr)
int32 c;
sim_clock_coschedule (uptr, tmxr_poll); /* continue poll */
if ((tti_csr & CSR_DONE) && /* input still pending and < 500ms? */
((sim_os_msec () - tti_buftime) < 500))
return SCPE_OK;
if ((c = sim_poll_kbd ()) < SCPE_KFLAG) /* no char or error? */
return c;
if (c & SCPE_BREAK) /* break? */
uptr->buf = 0;
else uptr->buf = sim_tt_inpcvt (c, TT_GET_MODE (uptr->flags));
tti_buftime = sim_os_msec ();
uptr->pos = uptr->pos + 1;
tti_csr = tti_csr | CSR_DONE;
if (tti_csr & CSR_IE)