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
38 /*
39 * Dummy stdio hooks. This allows programs to link without requiring
40 * any system-dependent functions. This is only used if the program
41 * doesn't provide its own version of stdin, stdout, stderr
42 */
43
44 static int
dummy_putc(char c,FILE * file)45 dummy_putc(char c, FILE *file)
46 {
47 (void) c;
48 (void) file;
49 return (unsigned char) c;
50 }
51
52 static int
dummy_getc(FILE * file)53 dummy_getc(FILE *file)
54 {
55 (void) file;
56 return EOF;
57 }
58
59 static int
dummy_flush(FILE * file)60 dummy_flush(FILE *file)
61 {
62 (void) file;
63 return 0;
64 }
65
66 static FILE __stdio = FDEV_SETUP_STREAM(dummy_putc, dummy_getc, dummy_flush, _FDEV_SETUP_RW);
67
68 #ifdef __strong_reference
69 #define STDIO_ALIAS(x) __strong_reference(stdin, x);
70 #else
71 #define STDIO_ALIAS(x) FILE *const x = &__stdio;
72 #endif
73
74 FILE *const stdin = &__stdio;
75 STDIO_ALIAS(stdout);
76 STDIO_ALIAS(stderr);
77
