[newlib-cygwin] Cygwin: dsp: Avoid setting buffer that is too small.

[newlib-cygwin] Cygwin: dsp: Avoid setting buffer that is too small.

[Takashi Yano]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=322c7150b25ebd2c4c2bd4e3abbe0978f66f3737

commit 322c7150b25ebd2c4c2bd4e3abbe0978f66f3737
Author: Takashi Yano <takashi.yano@nifty.ne.jp>
Date:   Sun Sep 17 08:49:34 2023 +0900

    Cygwin: dsp: Avoid setting buffer that is too small.
    
    The buffer size that is too small causes choppy sound. That is not
    practical at all. With this patch, the minimum value of the buffer
    size (i.e. fragstotal * fragsize) is restricted to 16384 bytes.
    
    Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>

Diff:
---
 winsup/cygwin/fhandler/dsp.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/winsup/cygwin/fhandler/dsp.cc b/winsup/cygwin/fhandler/dsp.cc
index 03c812a9c..97f3eaa27 100644
--- a/winsup/cygwin/fhandler/dsp.cc
+++ b/winsup/cygwin/fhandler/dsp.cc
@@ -1430,6 +1430,8 @@ fhandler_dev_dsp::_ioctl (unsigned int cmd, void *buf)
 	int *p = (int *) buf;
 	fragstotal_ = min (*p >> 16, MAX_BLOCKS);
 	fragsize_ = 1 << (*p & 0xffff);
+	while (fragsize_ * fragstotal_ < 16384)
+	  fragsize_ *= 2;
 	fragment_has_been_set = true;
 	return 0;
       }