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