1 /*
2 * Copyright (c) 2003-2010 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /*
29 * @OSF_FREE_COPYRIGHT@
30 *
31 */
32
33 #include <mach/mach.h>
34 #include <mach/mach_init.h>
35 #include <stdarg.h>
36 #include "string.h"
37
38 int (*vprintf_stderr_func)(const char *format, va_list ap) __printflike(1, 0);
39
40 #define __STDERR_FILENO 2
41 int write(int fd, const char* cbuf, int nbyte);
42
43 /* This function allows the writing of a mach error message to an
44 * application-controllable output method, the default being to
45 * use printf if no other method is specified by the application.
46 *
47 * To override, set the global function pointer vprintf_stderr to
48 * a function which takes the same parameters as vprintf.
49 */
50
51 __printflike(1, 2)
52 __private_extern__ int
fprintf_stderr(const char * format,...)53 fprintf_stderr(const char *format, ...)
54 {
55 va_list args;
56 int retval;
57
58 va_start(args, format);
59 if (vprintf_stderr_func == NULL) {
60 char buffer[1024];
61 retval = _mach_vsnprintf(buffer, sizeof(buffer), format, args);
62 write(__STDERR_FILENO, buffer, retval);
63 } else {
64 retval = (*vprintf_stderr_func)(format, args);
65 }
66 va_end(args);
67
68 return retval;
69 }
70