diff options
Diffstat (limited to 'com32/lib/sys/read.c')
| -rw-r--r-- | com32/lib/sys/read.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/com32/lib/sys/read.c b/com32/lib/sys/read.c index 388f6987..a3395c38 100644 --- a/com32/lib/sys/read.c +++ b/com32/lib/sys/read.c @@ -1,6 +1,7 @@ /* ----------------------------------------------------------------------- * * - * Copyright 2004-2008 H. Peter Anvin - All Rights Reserved + * Copyright 2004-2009 H. Peter Anvin - All Rights Reserved + * Copyright 2009 Intel Corporation; author: H. Peter Anvin * * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation @@ -40,6 +41,7 @@ ssize_t read(int fd, void *buf, size_t count) { + char *datap = buf; struct file_info *fp = &__file_info[fd]; size_t n0, n1; @@ -48,19 +50,20 @@ ssize_t read(int fd, void *buf, size_t count) return -1; } - if (!count) + if (__unlikely(!count)) return 0; n0 = min(fp->i.unread_bytes, count); - if (n0) { - memcpy(buf, unread_data(fp), n0); + if (__unlikely(n0)) { + memcpy(datap, unread_data(fp), n0); fp->i.unread_bytes -= n0; count -= n0; + datap += n0; if (!count) return n0; } - n1 = fp->iop->read(fp, buf, count); + n1 = fp->iop->read(fp, datap, count); if (n1 == -1 && n0 > 0) return n0; |