Fixed ticket #106: writing data outside buffer in Win32 error string generation

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@954 74dad513-b988-da41-8d7b-12977e46ad98

pjlib/src/pj/os_error_win32.c

@@ -194,6 +194,7 @@ int platform_strerror( pj_os_err_type os_errcode,
 			     buf,
 			     bufsize,
 			     NULL);
+	buf[bufsize-1] = '\0';
 #endif
 
 	if (len) {
@@ -208,6 +209,8 @@ int platform_strerror( pj_os_err_type os_errcode,
     if (!len) {
 	len = pj_ansi_snprintf( buf, bufsize, "Win32 error code %u", 
 				(unsigned)os_errcode);
+	if (len < 0 || len >= (int)bufsize)
+	    len = bufsize-1;
 	buf[len] = '\0';
     }