added xmlStrVPrintf function

ChangeLog

@@ -1,3 +1,7 @@
+Wed Oct 29 07:49:52 2003  Aleksey Sanin  <aleksey@aleksey.com>
+
+	* include/libxml/parser.h parser.c: added xmlStrVPrintf function
+
 Wed Oct 29 14:37:40 CET 2003 Daniel Veillard <daniel@veillard.com>
 
 	* nanoftp.c nanohttp.c testThreads.c threads.c: applied patch from

include/libxml/parser.h

@@ -9,6 +9,8 @@
 #ifndef __XML_PARSER_H__
 #define __XML_PARSER_H__
 
+#include <stdarg.h>
+
 #include <libxml/xmlversion.h>
 #include <libxml/tree.h>
 #include <libxml/dict.h>
@@ -864,6 +866,12 @@ XMLPUBFUN int XMLCALL
 					 const xmlChar *msg,
 					 ...);
 
+XMLPUBFUN int XMLCALL	
+		xmlStrVPrintf		(xmlChar *buf,
+					 int len,
+					 const xmlChar *msg,
+					 va_list ap);
+
 /*
  * Basic parsing Interfaces
  */

parser.c

@@ -2482,6 +2482,30 @@ xmlStrPrintf(xmlChar *buf, int len, const xmlChar *msg, ...) {
     return(ret);
 }
 
+/**
+ * xmlStrVPrintf:
+ * @buf:   the result buffer.
+ * @len:   the result buffer length.
+ * @msg:   the message with printf formatting.
+ * @ap:    extra parameters for the message.
+ *
+ * Formats @msg and places result into @buf.
+ *
+ * Returns the number of characters written to @buf or -1 if an error occurs.
+ */
+int 
+xmlStrVPrintf(xmlChar *buf, int len, const xmlChar *msg, va_list ap) {
+    int ret;
+    
+    if((buf == NULL) || (msg == NULL)) {
+	return(-1);
+    }
+    
+    ret = vsnprintf((char *) buf, len, (const char *) msg, ap);
+    buf[len - 1] = 0; /* be safe ! */
+    
+    return(ret);
+}
 /************************************************************************
  *									*
  *		Commodity functions, cleanup needed ?			*