Import sources from 2011-03-30 iso image

1 files changed, 49 insertions, 0 deletions

diff --git a/sys/src/libc/9sys/readv.c b/sys/src/libc/9sys/readv.c
new file mode 100755
index 000000000..a0dc10aaf
--- /dev/null
+++ b/sys/src/libc/9sys/readv.c
@@ -0,0 +1,49 @@
+#include <u.h>
+#include <libc.h>
+
+static
+long
+ioreadv(int fd, IOchunk *io, int nio, vlong offset)
+{
+	int i;
+	long m, n, tot;
+	char *buf, *p;
+
+	tot = 0;
+	for(i=0; i<nio; i++)
+		tot += io[i].len;
+	buf = malloc(tot);
+	if(buf == nil)
+		return -1;
+
+	tot = pread(fd, buf, tot, offset);
+
+	p = buf;
+	n = tot;
+	for(i=0; i<nio; i++){
+		if(n <= 0)
+			break;
+		m = io->len;
+		if(m > n)
+			m = n;
+		memmove(io->addr, p, m);
+		n -= m;
+		p += m;
+		io++;
+	}
+
+	free(buf);
+	return tot;
+}
+
+long
+readv(int fd, IOchunk *io, int nio)
+{
+	return ioreadv(fd, io, nio, -1LL);
+}
+
+long
+preadv(int fd, IOchunk *io, int nio, vlong off)
+{
+	return ioreadv(fd, io, nio, off);
+}