mach/fprintf_stderr.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_FREE_COPYRIGHT@
  27  *
  28  */
  29
  30 #include <mach/mach.h>
  31 #include <mach/mach_init.h>
  32 #include <stdio.h>
  33 #include <stdarg.h>
  34
  35 int (*vprintf_stderr_func)(const char *format, va_list ap);
  36
  37
  38 /* This function allows the writing of a mach error message to an
  39  * application-controllable output method, the default being to
  40  * use printf if no other method is specified by the application.
  41  *
  42  * To override, set the global (static) function pointer vprintf_stderr to
  43  * a function which takes the same parameters as vprintf.
  44  */
  45
  46 int fprintf_stderr(const char *format, ...)
  47 {
  48         va_list args;
  49         int retval;
  50
  51         va_start(args, format);
  52         if (vprintf_stderr_func == NULL)
  53                 retval = vprintf(format, args);
  54         else
  55                 retval = (*vprintf_stderr_func)(format, args);
  56         va_end(args);
  57
  58         return retval;
  59 }