wrbuf_buf: make it always return non-NULL

Also, wrbuf_buf will return same buffer as previous call to wrbuf_cstr.

diff --git a/src/wrbuf.c b/src/wrbuf.c
index 21401c7..69586e0 100644 (file)
--- a/src/wrbuf.c
+++ b/src/wrbuf.c
@@ -31,6 +31,7 @@ WRBUF wrbuf_alloc(void)
     n->buf = 0;
     n->size = 0;
     n->pos = 0;
+    wrbuf_grow(n, 1);
     return n;
 }
 
@@ -262,9 +263,7 @@ void wrbuf_iconv_reset(WRBUF b, yaz_iconv_t cd)
 
 const char *wrbuf_cstr(WRBUF b)
 {
-    if (b->pos == 0)
-       return "";
-    assert(b->pos <= b->size);
+    assert(b && b->pos <= b->size);
     b->buf[b->pos] = '\0';
     return b->buf;
 }