X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=secnet.git;a=blobdiff_plain;f=util.c;h=f5f3d75aa81c891ef04368d739d2d488120375a1;hp=63fe76f4451a80e2a6c266fffb8c1aabd878d20f;hb=e42d5acf494ed76046f0c63ad4a13ae2a0c473c8;hpb=7b1a9fb74228564b5ee07b48c042ee7b9a2260f1

diff --git a/util.c b/util.c
index 63fe76f..f5f3d75 100644
--- a/util.c
+++ b/util.c
@@ -269,6 +269,7 @@ void *buf_unappend(struct buffer_if *buf, int32_t amount) {
 
 void *buf_unprepend(struct buffer_if *buf, int32_t amount) {
     void *p;
+    if (buf->size < amount) return 0;
     p=buf->start;
     buf->start+=amount;
     buf->size-=amount;
@@ -300,6 +301,18 @@ void buffer_new(struct buffer_if *buf, int32_t len)
     buf->base=safe_malloc(len,"buffer_new");
 }
 
+void buffer_copy(struct buffer_if *dst, const struct buffer_if *src)
+{
+    if (dst->len < src->len) {
+	dst->base=realloc(dst->base,src->len);
+	if (!dst->base) fatal_perror("buffer_copy");
+	dst->len = src->len;
+    }
+    dst->start = dst->base + (src->start - src->base);
+    dst->size = src->size;
+    memcpy(dst->start, src->start, dst->size);
+}
+
 static list_t *buffer_apply(closure_t *self, struct cloc loc, dict_t *context,
 			    list_t *args)
 {