X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=util.c;fp=util.c;h=86a9cd82d55eddf5134b0135f996ac90af922159;hb=59230b9b9fc44453f24c6b3cf33a0f4c570a3563;hp=997979ac93b4e99b498602077f72519755eb68c6;hpb=7908f2c6b5be419f8f4031876139953d4ee8340d;p=secnet.git

diff --git a/util.c b/util.c
index 997979a..86a9cd8 100644
--- a/util.c
+++ b/util.c
@@ -243,12 +243,14 @@ void buffer_init(struct buffer_if *buffer, uint32_t max_start_pad)
 
 void *buf_append(struct buffer_if *buf, uint32_t amount) {
     void *p;
+    assert(buf->size <= buf->len - amount);
     p=buf->start + buf->size;
     buf->size+=amount;
     return p;
 }
 
 void *buf_prepend(struct buffer_if *buf, uint32_t amount) {
+    assert(amount <= buf->start - buf->base);
     buf->size+=amount;
     return buf->start-=amount;
 }
@@ -273,6 +275,7 @@ void buf_append_string(struct buffer_if *buf, cstring_t s)
     uint16_t len;
 
     len=strlen(s);
+    /* fixme: if string is longer than 65535, result is a corrupted packet */
     buf_append_uint16(buf,len);
     memcpy(buf_append(buf,len),s,len);
 }