109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/* open for MMIXware.
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Copyright (C) 2001 Hans-Peter Nilsson
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Permission to use, copy, modify, and distribute this software is
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freely granted, provided that the above copyright notice, this notice
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and the following disclaimer are preserved with no changes.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE. */
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#include <fcntl.h>
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#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "sys/syscall.h"
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#include <errno.h>
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/* Let's keep the filehandle array here, since this is a primary
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initializer of it. */
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unsigned char _MMIX_allocated_filehandle[32] =
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{
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1,
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1,
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1,
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0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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int
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_open (const char *path,
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int flags, ...)
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{
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long fileno;
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unsigned char mode;
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long fffile = 0;
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long ret;
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for (fileno = 0;
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fileno < (sizeof (_MMIX_allocated_filehandle) /
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sizeof (_MMIX_allocated_filehandle[0]));
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fileno++)
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if (_MMIX_allocated_filehandle[fileno] == 0)
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break;
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if (fileno == (sizeof (_MMIX_allocated_filehandle) /
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sizeof (_MMIX_allocated_filehandle[0])))
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{
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errno = EMFILE;
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return -1;
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}
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/* We map this to a fopen call. The flags parameter is stymied because
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we don't support more other than these flags. */
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if (flags & ~(O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_APPEND | O_TRUNC))
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{
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UNIMPLEMENTED (("path: %s, flags: %d", path, flags));
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errno = ENOSYS;
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return -1;
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}
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if ((flags & O_ACCMODE) == O_RDONLY)
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mode = BinaryRead;
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else if ((flags & (O_WRONLY | O_APPEND)) == (O_WRONLY | O_APPEND))
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{
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mode = BinaryReadWrite;
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fffile = 1;
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}
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else if ((flags & (O_RDWR | O_APPEND)) == (O_RDWR | O_APPEND))
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{
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mode = BinaryReadWrite;
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fffile = 1;
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}
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else if ((flags & (O_WRONLY | O_CREAT)) == (O_WRONLY | O_CREAT)
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|| (flags & (O_WRONLY | O_TRUNC)) == (O_WRONLY | O_TRUNC))
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mode = BinaryWrite;
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else if ((flags & (O_RDWR | O_CREAT)) == (O_RDWR | O_CREAT))
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mode = BinaryReadWrite;
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else if (flags & O_RDWR)
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mode = BinaryReadWrite;
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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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ret = TRAP3f (SYS_Fopen, fileno, path, mode);
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if (ret < 0)
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{
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/* It's totally unknown what the error was. We'll just take our
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chances and assume ENOENT. */
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errno = ENOENT;
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return -1;
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}
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_MMIX_allocated_filehandle[fileno] = 1;
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if (fffile)
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{
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TRAP2f (SYS_Fseek, fileno, -1);
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}
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return fileno;
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}
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