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#ident "$Id$"
/* ----------------------------------------------------------------------- *
*
* Copyright 2003 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
#include <errno.h>
#include <com32.h>
#include <string.h>
#include "file.h"
int open(const char *pathname, int flags, mode_t mode)
{
com32sys_t regs;
int fd;
struct file_info *fp;
if ( flags ) {
errno = EINVAL;
return -1;
}
for ( fd = 0, fp = __file_info ; fd < NFILES ; fd++, fp++ )
if ( fp->blocklg2 == 0 )
break;
if ( fd >= NFILES ) {
errno = EMFILE;
return -1;
}
strlcpy(__com32.cs_bounce, pathname, __com32.cs_bounce_size);
regs.eax.w[0] = 0x0006;
regs.esi.w[0] = OFFS(__com32.cs_bounce);
regs.es = SEG(__com32.cs_bounce);
__com32.cs_intcall(0x22, ®s, ®s);
if ( (regs.eflags.l & EFLAGS_CF) || regs.esi.w[0] == 0 ) {
errno = ENOENT;
return -1;
}
{
uint16_t blklg2;
asm("bsrw %1,%0" : "=r" (blklg2) : "rm" (regs.ecx.w[0]));
fp->blocklg2 = blklg2;
}
fp->length = regs.eax.l;
fp->filedes = regs.esi.w[0];
fp->offset = 0;
fp->nbytes = 0;
fp->datap = fp->buf;
return fd;
}
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