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63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* Copyright (C) 2020 Embecosm Limited
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <machine/syscall.h>
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#include "semihost_syscall.h"
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#include "semihost_fdtable.h"
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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extern int errno;
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#define SEMIHOST_MODE_R 0
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#define SEMIHOST_MODE_RPLUS 2
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#define SEMIHOST_MODE_W 4
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#define SEMIHOST_MODE_WPLUS 6
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#define SEMIHOST_MODE_A 8
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#define SEMIHOST_MODE_APLUS 10
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/* Open a file. */
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int
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_open (const char *name, int flags, ...)
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{
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int fh;
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int mode;
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long data_block[3];
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/* Work out mode from flags. */
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if ((flags & (O_RDONLY | O_WRONLY | O_RDWR)) == O_RDONLY)
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mode = SEMIHOST_MODE_R;
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else if ((flags & (O_WRONLY | O_CREAT | O_TRUNC))
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== (O_WRONLY | O_CREAT | O_TRUNC))
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mode = SEMIHOST_MODE_W;
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else if ((flags & (O_WRONLY | O_CREAT | O_APPEND))
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== (O_WRONLY | O_CREAT | O_APPEND))
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mode = SEMIHOST_MODE_A;
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else if ((flags & (O_RDWR | O_CREAT | O_TRUNC))
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== (O_RDWR | O_CREAT | O_TRUNC))
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mode = SEMIHOST_MODE_WPLUS;
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else if ((flags & (O_RDWR | O_CREAT | O_APPEND))
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== (O_RDWR | O_CREAT | O_APPEND))
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mode = SEMIHOST_MODE_APLUS;
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else if (flags & O_RDWR)
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mode = SEMIHOST_MODE_RPLUS;
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else
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{
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errno = EINVAL;
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return -1;
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}
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data_block[0] = (long) name;
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data_block[1] = mode;
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data_block[2] = strlen (name);
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fh = syscall_errno (SEMIHOST_open, data_block);
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/* Failed to open file. */
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if (fh == -1)
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return -1;
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/* Register the file in the fdtable. */
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return __add_fdentry (fh);
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}
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