339 lines
7.2 KiB
C
339 lines
7.2 KiB
C
/*
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* File : stubs.c
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* Brief : reimplement some basic functions of arm standard c library
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*
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2012-11-23 Yihui The first version
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* 2013-11-24 aozima fixed _sys_read()/_sys_write() issues.
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* 2014-08-03 bernard If using msh, use system() implementation
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* in msh.
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*/
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#include <string.h>
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#include <rt_sys.h>
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#include "rtthread.h"
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#include "libc.h"
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#ifdef RT_USING_DFS
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#include "dfs_posix.h"
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#endif
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#pragma import(__use_no_semihosting_swi)
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/* Standard IO device handles. */
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#define STDIN 0
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#define STDOUT 1
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#define STDERR 2
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/* Standard IO device name defines. */
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const char __stdin_name[] = "STDIN";
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const char __stdout_name[] = "STDOUT";
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const char __stderr_name[] = "STDERR";
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/**
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* required by fopen() and freopen().
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*
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* @param name - file name with path.
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* @param openmode - a bitmap hose bits mostly correspond directly to
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* the ISO mode specification.
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* @return -1 if an error occurs.
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*/
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FILEHANDLE _sys_open(const char *name, int openmode)
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{
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#ifdef RT_USING_DFS
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int fd;
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int mode = O_RDONLY;
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#endif
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/* Register standard Input Output devices. */
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if (strcmp(name, __stdin_name) == 0)
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return (STDIN);
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if (strcmp(name, __stdout_name) == 0)
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return (STDOUT);
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if (strcmp(name, __stderr_name) == 0)
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return (STDERR);
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#ifndef RT_USING_DFS
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return -1;
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#else
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/* Correct openmode from fopen to open */
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if (openmode & OPEN_PLUS)
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{
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if (openmode & OPEN_W)
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{
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mode |= (O_RDWR | O_TRUNC | O_CREAT);
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}
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else if (openmode & OPEN_A)
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{
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mode |= (O_RDWR | O_APPEND | O_CREAT);
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}
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else
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mode |= O_RDWR;
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}
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else
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{
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if (openmode & OPEN_W)
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{
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mode |= (O_WRONLY | O_TRUNC | O_CREAT);
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}
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else if (openmode & OPEN_A)
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{
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mode |= (O_WRONLY | O_APPEND | O_CREAT);
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}
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}
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fd = open(name, mode, 0);
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if (fd < 0)
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return -1;
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else
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return fd;
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#endif
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}
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int _sys_close(FILEHANDLE fh)
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{
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#ifndef RT_USING_DFS
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return 0;
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#else
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if (fh <= STDERR) return 0;
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return close(fh);
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#endif
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}
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/*
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* Read from a file. Can return:
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* - zero if the read was completely successful
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* - the number of bytes _not_ read, if the read was partially successful
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* - the number of bytes not read, plus the top bit set (0x80000000), if
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* the read was partially successful due to end of file
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* - -1 if some error other than EOF occurred
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*
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* It is also legal to signal EOF by returning no data but
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* signalling no error (i.e. the top-bit-set mechanism need never
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* be used).
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*
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* So if (for example) the user is trying to read 8 bytes at a time
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* from a file in which only 5 remain, this routine can do three
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* equally valid things:
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*
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* - it can return 0x80000003 (3 bytes not read due to EOF)
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* - OR it can return 3 (3 bytes not read), and then return
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* 0x80000008 (8 bytes not read due to EOF) on the next attempt
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* - OR it can return 3 (3 bytes not read), and then return
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* 8 (8 bytes not read, meaning 0 read, meaning EOF) on the next
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* attempt
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*
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* `mode' exists for historical reasons and must be ignored.
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*/
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int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
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{
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#ifdef RT_USING_DFS
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int size;
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#endif
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if (fh == STDIN)
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{
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#ifdef RT_USING_POSIX
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size = libc_stdio_read(buf, len);
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return len - size;
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#else
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/* no stdin */
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return -1;
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#endif
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}
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if ((fh == STDOUT) || (fh == STDERR))
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return -1;
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#ifndef RT_USING_DFS
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return 0;
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#else
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size = read(fh, buf, len);
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if (size >= 0)
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return len - size;
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else
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return -1;
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#endif
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}
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/*
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* Write to a file. Returns 0 on success, negative on error, and
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* the number of characters _not_ written on partial success.
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* `mode' exists for historical reasons and must be ignored.
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*/
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int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
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{
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#ifdef RT_USING_DFS
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int size;
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#endif
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if ((fh == STDOUT) || (fh == STDERR))
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{
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#ifndef RT_USING_CONSOLE
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return 0;
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#else
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#ifdef RT_USING_POSIX
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size = libc_stdio_write(buf, len);
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return len - size;
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#else
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if (rt_console_get_device())
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{
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rt_device_write(rt_console_get_device(), -1, buf, len);
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return 0;
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}
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return -1;
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#endif
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#endif
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}
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if (fh == STDIN) return -1;
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#ifndef RT_USING_DFS
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return 0;
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#else
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size = write(fh, buf, len);
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if (size >= 0)
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return len - size;
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else
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return -1;
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#endif
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}
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/*
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* Move the file position to a given offset from the file start.
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* Returns >=0 on success, <0 on failure.
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*/
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int _sys_seek(FILEHANDLE fh, long pos)
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{
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if (fh < STDERR)
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return -1;
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#ifndef RT_USING_DFS
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return -1;
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#else
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/* position is relative to the start of file fh */
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return lseek(fh, pos, 0);
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#endif
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}
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/**
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* used by tmpnam() or tmpfile()
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*/
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int _sys_tmpnam(char *name, int fileno, unsigned maxlength)
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{
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return -1;
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}
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char *_sys_command_string(char *cmd, int len)
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{
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/* no support */
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return cmd;
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}
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/* This function writes a character to the console. */
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void _ttywrch(int ch)
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{
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#ifdef RT_USING_CONSOLE
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char c;
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c = (char)ch;
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rt_kprintf(&c);
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#endif
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}
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void _sys_exit(int return_code)
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{
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/* TODO: perhaps exit the thread which is invoking this function */
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while (1);
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}
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/**
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* return current length of file.
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*
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* @param fh - file handle
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* @return file length, or -1 on failed
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*/
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long _sys_flen(FILEHANDLE fh)
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{
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return -1;
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}
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int _sys_istty(FILEHANDLE fh)
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{
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return 0;
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}
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int remove(const char *filename)
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{
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#ifndef RT_USING_DFS
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return -1;
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#else
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return unlink(filename);
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#endif
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}
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#if defined(RT_USING_FINSH) && defined(FINSH_USING_MSH) && defined(RT_USING_MODULE) && defined(RT_USING_DFS)
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/* use system(const char *string) implementation in the msh */
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#else
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int system(const char *string)
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{
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RT_ASSERT(0);
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for (;;);
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}
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#endif
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#ifdef __MICROLIB
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#include <stdio.h>
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int fputc(int c, FILE *f)
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{
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char ch = c;
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rt_kprintf(&ch);
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return 1;
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}
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int fgetc(FILE *f)
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{
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char ch;
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#ifdef RT_USING_POSIX
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if (libc_stdio_read(&ch, 1) == 1)
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return ch;
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#endif
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return -1;
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}
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#endif
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#ifndef RT_USING_RTC
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time_t time(time_t *t)
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{
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time_t time_now = 0;
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return time_now;
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}
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#endif
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