Grow decode stack, prealloc strings during encode

- Check stack usage during decode to prevent crashing in excessively
  nested data structures.
- Preallocate the required memory for json_append_string().

1 files changed, 1 insertions, 3 deletions

diff --git a/strbuf.c b/strbuf.c
index 227cb47..44145dd 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -152,9 +152,7 @@ void strbuf_resize(strbuf_t *s, int len)
 
 void strbuf_append_mem(strbuf_t *s, const char *c, int len)
 {
-    if (len > strbuf_empty_length(s))
-        strbuf_resize(s, s->length + len);
-
+    strbuf_ensure_empty_length(s, len);
     memcpy(s->buf + s->length, c, len);
     s->length += len;
 }