1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2022 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 <stdlib.h>
38 #include <unistd.h>
39 #include "sh_semihost.h"
40
41 int
sh_putc(char c,FILE * file)42 sh_putc(char c, FILE *file)
43 {
44 (void) file;
45 #ifdef SH_QEMU
46 sh_serial0.tdr = (unsigned char) c;
47 #else
48 sh_cons.data = c;
49 #endif
50 return (unsigned char) c;
51 }
52
53 int
sh_getc(FILE * file)54 sh_getc(FILE *file)
55 {
56 (void) file;
57 #ifdef SH_QEMU
58 return EOF;
59 #else
60 for (;;) {
61 uint8_t c;
62 c = sh_cons.data;
63 if (c != 0)
64 return (int) c;
65 }
66 #endif
67 }
68
69 #ifdef TINY_STDIO
70 static FILE __stdio = FDEV_SETUP_STREAM(sh_putc, sh_getc, NULL, _FDEV_SETUP_RW);
71
72 #ifdef __strong_reference
73 #define STDIO_ALIAS(x) __strong_reference(stdin, x);
74 #else
75 #define STDIO_ALIAS(x) FILE *const x = &__stdio;
76 #endif
77
78 FILE *const stdin = &__stdio;
79 STDIO_ALIAS(stdout);
80 STDIO_ALIAS(stderr);
81 #endif
82
