1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2019 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <stdio.h>
37 #include <sys/cdefs.h>
38
39 /*
40 * Dummy stdio hooks. This allows programs to link without requiring
41 * any system-dependent functions. This is only used if the program
42 * doesn't provide its own version of stdin, stdout, stderr
43 */
44
45 static int
dummy_putc(char c,FILE * file)46 dummy_putc(char c, FILE *file)
47 {
48 (void) c;
49 (void) file;
50 return (unsigned char) c;
51 }
52
53 static int
dummy_getc(FILE * file)54 dummy_getc(FILE *file)
55 {
56 (void) file;
57 return EOF;
58 }
59
60 static int
dummy_flush(FILE * file)61 dummy_flush(FILE *file)
62 {
63 (void) file;
64 return 0;
65 }
66
67 static FILE __stdio = FDEV_SETUP_STREAM(dummy_putc, dummy_getc, dummy_flush, _FDEV_SETUP_RW);
68
69 #ifdef __strong_reference
70 #define STDIO_ALIAS(x) __strong_reference(stdin, x);
71 #else
72 #define STDIO_ALIAS(x) FILE *const x = &__stdio;
73 #endif
74
75 FILE *const stdin = &__stdio;
76 STDIO_ALIAS(stdout);
77 STDIO_ALIAS(stderr);
78
