mach/fprintf_stderr.c

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