The last major revision to the upb_stream protocol.

Sources and sinks communicate by means of a
upb_handlers object, which encapsulates a set of
handler callbacks and will possibly offer richer
semantics in the future like giving specific
fields different callbacks.

The upb_handlers protocol supports delegation, so
sets of handlers can be written in reusable ways.
For example, if a set of handlers is written to
handle a specific .proto type, those handlers can
be used whether that type is at the top level or
whether it is a sub-message of a higher-level type.
Delegation allows the streaming protocol to
properly compose.

1 files changed, 9 insertions, 0 deletions

diff --git a/core/upb_string.c b/core/upb_string.c
index 847a3ee..4f5f5c2 100644
--- a/core/upb_string.c
+++ b/core/upb_string.c
@@ -29,6 +29,7 @@ upb_string *upb_string_new() {
   upb_string *str = malloc(sizeof(*str));
   str->ptr = NULL;
   str->cached_mem = NULL;
+  str->len = 0;
 #ifndef UPB_HAVE_MSIZE
   str->size = 0;
 #endif
@@ -132,6 +133,14 @@ upb_string *upb_strdup(upb_string *s) {
   return str;
 }
 
+void upb_strcat(upb_string *s, upb_string *append) {
+  uint32_t old_size = upb_string_len(s);
+  uint32_t append_size = upb_string_len(append);
+  uint32_t new_size = old_size + append_size;
+  char *buf = upb_string_getrwbuf(s, new_size);
+  memcpy(buf + old_size, upb_string_getrobuf(append), append_size);
+}
+
 upb_string *upb_strreadfile(const char *filename) {
   FILE *f = fopen(filename, "rb");
   if(!f) return NULL;