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termios: Simplify some calculations

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Use the modular arithmetic addition rule.
This commit is contained in:
Sebastian Huber
2017-02-28 09:12:13 +01:00
parent 902ffeddb5
commit f71ccc345e
1 changed files with 3 additions and 4 deletions
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7
cpukit/libcsupport/src/termios.c
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@@ -1533,8 +1533,7 @@ fillBufferQueue (struct rtems_termios_tty *tty)
c = tty->rawInBuf.theBuf[newHead];
tty->rawInBuf.Head = newHead;
if(((tty->rawInBuf.Tail-newHead+tty->rawInBuf.Size)
% tty->rawInBuf.Size)
if(((tty->rawInBuf.Tail - newHead) % tty->rawInBuf.Size)
< tty->lowwater) {
tty->flow_ctrl &= ~FL_IREQXOF;
/* if tx stopped and XON should be sent... */
@@ -1756,8 +1755,8 @@ rtems_termios_enqueue_raw_characters (void *ttyp, const char *buf, int len)
newTail = (oldTail + 1) % tty->rawInBuf.Size;
/* if chars_in_buffer > highwater */
if ((tty->flow_ctrl & FL_IREQXOF) != 0 && (((newTail - head
+ tty->rawInBuf.Size) % tty->rawInBuf.Size) > tty->highwater)) {
if ((tty->flow_ctrl & FL_IREQXOF) != 0 && (((newTail - head) %
tty->rawInBuf.Size) > tty->highwater)) {
/* incoming data stream should be stopped */
tty->flow_ctrl |= FL_IREQXOF;
if ((tty->flow_ctrl & (FL_MDXOF | FL_ISNTXOF))