Sane behaviour for the growing of very small buffers:

Always grow at least to the minimum requested size.
Before this, a buffer of 1 byte was grown to 2 bytes,
which was too small and sometimes caused segfaults.
ok kristaps@

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index f77f0aee..f6c625ec 100644
--- a/main.c
+++ b/main.c
@@ -389,7 +389,7 @@ static void
 resize_buf(struct buf *buf, size_t initial)
 {
 
-	buf->sz = buf->sz ? 2 * buf->sz : initial;
+	buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial;
 	buf->buf = realloc(buf->buf, buf->sz);
 	if (NULL == buf->buf) {
 		perror(NULL);