X-Git-Url: http://git.indexdata.com/?p=yaz-moved-to-github.git;a=blobdiff_plain;f=include%2Fyaz%2Fwrbuf.h;h=f5ebf1df84e762af2cf56e34fb0d6a61c8fd541f;hp=e7629d063c52e3d32a373206719c3253abd7a9e4;hb=a6b61b9f8b6576e8159a4e7e6aee88bba7e5d07d;hpb=053367cbe356fb3ce0def34b065dae589d700daf

diff --git a/include/yaz/wrbuf.h b/include/yaz/wrbuf.h
index e7629d0..f5ebf1d 100644
--- a/include/yaz/wrbuf.h
+++ b/include/yaz/wrbuf.h
@@ -242,14 +242,23 @@ YAZ_EXPORT int wrbuf_grow(WRBUF b, size_t minsize);
 #define wrbuf_buf(b) ((b)->buf)
 
 /** \brief returns WRBUF content as C-string
-    \param b WRBUF
+    \param b WRBUF (may not be NULL)
     \returns C-string
 */
 YAZ_EXPORT const char *wrbuf_cstr(WRBUF b);
 
+/** \brief returns WRBUF content as C-string or NULL
+    \param b WRBUF
+    \returns C-string or NULL
+
+    This function returns NULL if either b is NULL or length of buffer is 0
+*/
+YAZ_EXPORT
+const char *wrbuf_cstr_null(WRBUF b);
+
 #define wrbuf_putc(b, c) \
     ((void) ((b)->pos >= (b)->size ? wrbuf_grow(b, 1) : 0),  \
-    (b)->buf[(b)->pos++] = (c), 0)
+    (b)->buf[(b)->pos++] = (c))
 
 
 /** \brief writes JSON text to WRBUF with escaping