Import sources from 2011-03-30 iso image

1 files changed, 46 insertions, 0 deletions

diff --git a/sys/src/ape/lib/ap/plan9/read.c b/sys/src/ape/lib/ap/plan9/read.c
new file mode 100755
index 000000000..471ab7e33
--- /dev/null
+++ b/sys/src/ape/lib/ap/plan9/read.c
@@ -0,0 +1,46 @@
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include "lib.h"
+#include "sys9.h"
+
+#include <stdio.h>
+
+ssize_t
+read(int d, void *buf, size_t nbytes)
+{
+	int n, noblock, isbuf;
+	Fdinfo *f;
+
+	if(d<0 || d>=OPEN_MAX || !((f = &_fdinfo[d])->flags&FD_ISOPEN)){
+		errno = EBADF;
+		return -1;
+	}
+	if(nbytes <= 0)
+		return 0;
+	if(buf == 0){
+		errno = EFAULT;
+		return -1;
+	}
+	f = &_fdinfo[d];
+	noblock = f->oflags&O_NONBLOCK;
+	isbuf = f->flags&(FD_BUFFERED|FD_BUFFEREDX);
+	if(noblock || isbuf){
+		if(f->flags&FD_BUFFEREDX) {
+			errno = EIO;
+			return -1;
+		}
+		if(!isbuf) {
+			if(_startbuf(d) != 0) {
+				errno = EIO;
+				return -1;
+			}
+		}
+		n = _readbuf(d, buf, nbytes, noblock);
+	}else{
+		n = _READ(d,  buf, nbytes);
+		if(n < 0)
+			_syserrno();
+	}
+	return n;
+}