66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2006-2021, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2015-01-28 Bernard first version
|
|
*/
|
|
|
|
#include <rtthread.h>
|
|
#include <LowLevelIOInterface.h>
|
|
#include <unistd.h>
|
|
#ifdef RT_USING_POSIX_STDIO
|
|
#include <posix/stdio.h>
|
|
#endif /* RT_USING_POSIX_STDIO */
|
|
#include <compiler_private.h>
|
|
#define DBG_TAG "dlib.syscall.read"
|
|
#define DBG_LVL DBG_INFO
|
|
#include <rtdbg.h>
|
|
|
|
/*
|
|
* The "__read" function reads a number of bytes, at most "size" into
|
|
* the memory area pointed to by "buffer". It returns the number of
|
|
* bytes read, 0 at the end of the file, or _LLIO_ERROR if failure
|
|
* occurs.
|
|
*
|
|
* The template implementation below assumes that the application
|
|
* provides the function "MyLowLevelGetchar". It should return a
|
|
* character value, or -1 on failure.
|
|
*/
|
|
|
|
#pragma module_name = "?__read"
|
|
|
|
size_t __read(int handle, unsigned char *buf, size_t len)
|
|
{
|
|
#ifdef DFS_USING_POSIX
|
|
int size;
|
|
|
|
if (handle == _LLIO_STDIN)
|
|
{
|
|
#ifdef RT_USING_POSIX_STDIO
|
|
if (rt_posix_stdio_get_console() < 0)
|
|
{
|
|
LOG_W("Do not invoke standard input before initializing Compiler");
|
|
return 0; /* error, but keep going */
|
|
}
|
|
return read(STDIN_FILENO, buf, len); /* return the length of the data read */
|
|
#else
|
|
LOG_W(_WARNING_WITHOUT_STDIO);
|
|
return _LLIO_ERROR;
|
|
#endif /* RT_USING_POSIX_STDIO */
|
|
}
|
|
else if ((handle == _LLIO_STDOUT) || (handle == _LLIO_STDERR))
|
|
{
|
|
return _LLIO_ERROR;
|
|
}
|
|
|
|
size = read(handle, buf, len);
|
|
return size; /* return the length of the data read */
|
|
#else
|
|
LOG_W(_WARNING_WITHOUT_FS);
|
|
return _LLIO_ERROR;
|
|
#endif /* DFS_USING_POSIX */
|
|
}
|