* fix new wprintf backend to handle buffer increases

[citadel.git] / libcitadel / lib / stringbuf.c

diff --git a/libcitadel/lib/stringbuf.c b/libcitadel/lib/stringbuf.c
index 5a991df5a91d0b307a73aa2201df315b2c8f7f04..0e9fb0e504f626c67d5e37cbc5568721697d978b 100644 (file)
--- a/libcitadel/lib/stringbuf.c
+++ b/libcitadel/lib/stringbuf.c
@@ -254,14 +254,18 @@ void StrBufVAppendPrintf(StrBuf *Buf, const char *format, va_list ap)
 {
        size_t nWritten = Buf->BufSize + 1;
        size_t Offset = Buf->BufUsed;
+       size_t newused = Offset + nWritten;
        
-       while (Offset + nWritten >= Buf->BufSize) {
+       while (newused >= Buf->BufSize) {
                nWritten = vsnprintf(Buf->buf + Offset, 
                                     Buf->BufSize - Offset, 
                                     format, ap);
-               Buf->BufUsed = Offset + nWritten ;
-               if (nWritten >= Buf->BufSize)
-                       IncreaseBuf(Buf, 0, 0);
+               newused = Offset + nWritten;
+               if (newused >= Buf->BufSize)
+                       IncreaseBuf(Buf, 1, 0);
+               else
+                       Buf->BufUsed = Offset + nWritten ;
+
        }
 }