1 /* Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. */ 4 5 #include "nacl_io/log.h" 6 7 #include "nacl_io/kernel_wrap_real.h" 8 9 #include <alloca.h> 10 #include <stdarg.h> 11 #include <stdio.h> 12 #include <string.h> 13 14 void nacl_io_log(const char* format, ...) { 15 va_list args; 16 size_t wrote; 17 char* output; 18 19 #ifdef _MSC_VER 20 /* TODO(sbc): vsnprintf on win32 does not return the 21 * size of the buffer needed. This can be implemented 22 * on win32 in terms of _vscprintf; */ 23 #error "not implemented for win32" 24 #endif 25 26 va_start(args, format); 27 int len = vsnprintf(NULL, 0, format, args); 28 va_end(args); 29 output = alloca(len + 1); 30 31 va_start(args, format); 32 vsnprintf(output, len + 1, format, args); 33 va_end(args); 34 35 _real_write(2, output, strlen(output), &wrote); 36 } 37
