Ensure buf->offset is always smaller than buf->size.

[utcp] / utcp.c

diff --git a/utcp.c b/utcp.c
index 47acf221318bca518eca4d88bdd7ba04b0982071..fb93f2f62f4cc5e8bbb1d122701a45009dcad131 100644 (file)
--- a/utcp.c
+++ b/utcp.c
@@ -268,7 +268,7 @@ static ssize_t buffer_put_at(struct buffer *buf, size_t offset, const void *data
 
        uint32_t realoffset = buf->offset + offset;
 
-       if(buf->size - buf->offset < offset) {
+       if(buf->size - buf->offset <= offset) {
                // The offset wrapped
                realoffset -= buf->size;
        }
@@ -305,7 +305,7 @@ static ssize_t buffer_copy(struct buffer *buf, void *data, size_t offset, size_t
 
        uint32_t realoffset = buf->offset + offset;
 
-       if(buf->size - buf->offset < offset) {
+       if(buf->size - buf->offset <= offset) {
                // The offset wrapped
                realoffset -= buf->size;
        }
@@ -334,7 +334,7 @@ static ssize_t buffer_call(struct buffer *buf, utcp_recv_t cb, void *arg, size_t
 
        uint32_t realoffset = buf->offset + offset;
 
-       if(buf->size - buf->offset < offset) {
+       if(buf->size - buf->offset <= offset) {
                // The offset wrapped
                realoffset -= buf->size;
        }
@@ -365,7 +365,7 @@ static ssize_t buffer_discard(struct buffer *buf, size_t len) {
                len = buf->used;
        }
 
-       if(buf->size - buf->offset < len) {
+       if(buf->size - buf->offset <= len) {
                buf->offset -= buf->size;
        }