dvd-sector-copy.c: Limit `recovery_read' return value to length requested.

Otherwise the caller gets properly confused.

diff --git a/dvd-sector-copy.c b/dvd-sector-copy.c
index 4d44122..86540e0 100644 (file)
--- a/dvd-sector-copy.c
+++ b/dvd-sector-copy.c
@@ -663,6 +663,7 @@ static ssize_t recovery_read(struct recoverybuf *r,
 
   n = r->pos + r->end - pos;
   if (!n && want) n = -1;
+  else if (n > want) n = want;
 
 end:
 #ifdef DEBUG