[virt-tools-list] [vhostmd 1/5] Extend vu_buffer struct, init buffer allocated by buffer_grow

[Michael Trapp]

With the virtio implementation vu_buffer is used for socket IO
and therefore information about the current position after a
write is required.
buffer_grow uses realloc to extend the buffer, due to the fact that
realloc doesn't guarantee that allocated memory is initialized there
should be a memset.
---
 include/util.h | 1 +
 vhostmd/util.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/util.h b/include/util.h
index 3a21e09..c0bd19a 100644
--- a/include/util.h
+++ b/include/util.h
@@ -42,6 +42,7 @@ typedef enum {
 typedef struct _vu_buffer {
     unsigned int size;
     unsigned int use;
+    unsigned int pos;
     char *content;
 }vu_buffer;
 
diff --git a/vhostmd/util.c b/vhostmd/util.c
index 70fc804..c0f8f2b 100644
--- a/vhostmd/util.c
+++ b/vhostmd/util.c
@@ -53,6 +53,7 @@ static int buffer_grow(vu_buffer *buf, int len)
         return -1;
 
     buf->size = size;
+    memset(&buf->content[buf->use], 0, len);
     return 0;
 }
 
@@ -151,7 +152,7 @@ int vu_buffer_create(vu_buffer **buf, int len)
    *buf = calloc(1, sizeof(vu_buffer));
    if (*buf == NULL)
       return -1;
-   
+
    return buffer_grow(*buf, len);
 }
 
@@ -232,6 +233,7 @@ void vu_buffer_erase(vu_buffer *buf)
    if (buf) {
       memset(buf->content, '\0', buf->size);
       buf->use = 0;
+      buf->pos = 0;
    }
 }
 
-- 
2.15.2 (Apple Git-101.1)