91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
#ident "$Id: open.c,v 1.4 2004/11/23 23:43:02 hpa Exp $"
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 2003-2004 H. Peter Anvin - All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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#include <errno.h>
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#include <com32.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "file.h"
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/*
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* open.c
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*
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* Open an ordinary file
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*/
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extern ssize_t __file_read(struct file_info *, void *, size_t);
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extern int __file_close(struct file_info *);
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static const struct input_dev file_dev = {
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.dev_magic = __DEV_MAGIC,
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.flags = __DEV_FILE | __DEV_INPUT,
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.fileflags = O_RDONLY,
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.read = __file_read,
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.close = __file_close,
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};
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int open(const char *pathname, int flags, ...)
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{
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com32sys_t regs;
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int fd;
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struct file_info *fp;
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fd = opendev(&file_dev, NULL, flags);
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if ( fd < 0 )
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return -1;
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fp = &__file_info[fd];
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strlcpy(__com32.cs_bounce, pathname, __com32.cs_bounce_size);
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regs.eax.w[0] = 0x0006;
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regs.esi.w[0] = OFFS(__com32.cs_bounce);
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regs.es = SEG(__com32.cs_bounce);
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__com32.cs_intcall(0x22, ®s, ®s);
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if ( (regs.eflags.l & EFLAGS_CF) || regs.esi.w[0] == 0 ) {
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errno = ENOENT;
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return -1;
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}
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{
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uint16_t blklg2;
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asm("bsrw %1,%0" : "=r" (blklg2) : "rm" (regs.ecx.w[0]));
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fp->i.blocklg2 = blklg2;
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}
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fp->i.length = regs.eax.l;
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fp->i.filedes = regs.esi.w[0];
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fp->i.offset = 0;
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fp->i.nbytes = 0;
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return fd;
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}
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