1 /*
2 * Copyright (c) 2015, 2021 Intel Corporation.
3 * Copyright (c) 2021 Synopsys.
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8 #include <stdio.h>
9 #include <zephyr/sys/libc-hooks.h>
10 #include <zephyr/syscall_handler.h>
11 #include <string.h>
12 #include <zephyr/sys/errno_private.h>
13 #include <unistd.h>
14 #include <errno.h>
15
16 #ifndef STDIN_FILENO
17 #define STDIN_FILENO 0
18 #endif
19
20 #ifndef STDOUT_FILENO
21 #define STDOUT_FILENO 1
22 #endif
23
24 #ifndef STDERR_FILENO
25 #define STDERR_FILENO 2
26 #endif
27
_stdout_hook_default(int c)28 static int _stdout_hook_default(int c)
29 {
30 ARG_UNUSED(c);
31
32 return EOF;
33 }
34
35 static int (*_stdout_hook)(int) = _stdout_hook_default;
36
__stdout_hook_install(int (* hook)(int))37 void __stdout_hook_install(int (*hook)(int))
38 {
39 _stdout_hook = hook;
40 }
41
z_impl_zephyr_write_stdout(const void * buffer,int nbytes)42 int z_impl_zephyr_write_stdout(const void *buffer, int nbytes)
43 {
44 const char *buf = buffer;
45 int i;
46
47 for (i = 0; i < nbytes; i++) {
48 if (*(buf + i) == '\n') {
49 _stdout_hook('\r');
50 }
51 _stdout_hook(*(buf + i));
52 }
53 return nbytes;
54 }
55
56 #ifdef CONFIG_USERSPACE
z_vrfy_zephyr_write_stdout(const void * buf,int nbytes)57 static inline int z_vrfy_zephyr_write_stdout(const void *buf, int nbytes)
58 {
59 Z_OOPS(Z_SYSCALL_MEMORY_READ(buf, nbytes));
60 return z_impl_zephyr_write_stdout(buf, nbytes);
61 }
62 #include <syscalls/zephyr_write_stdout_mrsh.c>
63 #endif
64
65 #ifndef CONFIG_POSIX_API
_write(int fd,const char * buf,unsigned int nbytes)66 int _write(int fd, const char *buf, unsigned int nbytes)
67 {
68 ARG_UNUSED(fd);
69
70 return zephyr_write_stdout(buf, nbytes);
71 }
72 #endif
73
74 /*
75 * It's require to implement _isatty to have STDIN/STDOUT/STDERR buffered
76 * properly.
77 */
_isatty(int file)78 int _isatty(int file)
79 {
80 if (file == STDIN_FILENO || file == STDOUT_FILENO || file == STDERR_FILENO) {
81 return 1;
82 }
83
84 return 0;
85 }
86
___errno(void)87 int *___errno(void)
88 {
89 return z_errno();
90 }
91
_exit(int status)92 __weak void _exit(int status)
93 {
94 while (1) {
95 }
96 }
97
