BUG/MINOR: buffers: Fix b_slow_realign when a buffer is realign without output

When b_slow_realign is called with the <output> parameter equal to 0, the
buffer's head, after the realign, must be set to 0. It was errornously set to
the buffer's size, because there was no test on the value of <output>.

diff --git a/include/common/buf.h b/include/common/buf.h
index 6d46111..9647262 100644 (file)
--- a/include/common/buf.h
+++ b/include/common/buf.h
@@ -472,7 +472,7 @@ static inline void b_slow_realign(struct buffer *b, char *swap, size_t output)
        memcpy(b_orig(b), swap, b_data(b) - output);
        memcpy(b_wrap(b) - output, swap + b_size(b) - output, output);
 
-       b->head = b_size(b) - output;
+       b->head = (output ? b_size(b) - output : 0);
 }
 
 /* b_putchar() : tries to append char <c> at the end of buffer <b>. Supports