Fix bug 424: doing full_read breaks things like cat which should return a
chunk of data when they get it and not block until they've buffered 4k.
The use case was cat /proc/psaux, but you can also reproduce this by
running non-busybox cat by itself and typing things at the command line.
Then run busybox cat. Notice how cat is _supposed_ to echo each line back
to us as we hit enter?
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index 5915483..c1962e3 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -33,7 +33,7 @@
while (!size || total < size)
{
ssize_t wrote, xread = (size && size < BUFSIZ) ? size : BUFSIZ;
- xread = bb_full_read(src_fd, buffer, xread);
+ xread = safe_read(src_fd, buffer, xread);
if (xread > 0) {
/* A -1 dst_fd means we need to fake it... */
wrote = (dst_fd < 0) ? xread : bb_full_write(dst_fd, buffer, xread);