105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/* open.c -- open a file.
|
|
*
|
|
* Copyright (c) 1995 Cygnus Support
|
|
*
|
|
* The authors hereby grant permission to use, copy, modify, distribute,
|
|
* and license this software and its documentation for any purpose, provided
|
|
* that existing copyright notices are retained in all copies and that this
|
|
* notice is included verbatim in any distributions. No written agreement,
|
|
* license, or royalty fee is required for any of the authorized uses.
|
|
* Modifications to this software may be copyrighted by their authors
|
|
* and need not follow the licensing terms described here, provided that
|
|
* the new terms are clearly indicated on the first page of each file where
|
|
* they apply.
|
|
*/
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <sys/kos_io.h>
|
|
#include "glue.h"
|
|
#include "io.h"
|
|
|
|
#undef erro
|
|
extern int errno;
|
|
|
|
int open (const char * filename, int flags, ...)
|
|
{
|
|
__io_handle *ioh;
|
|
fileinfo_t info;
|
|
int iomode, rwmode, offset;
|
|
int hid;
|
|
int err;
|
|
|
|
hid = __io_alloc();
|
|
if(hid < 0)
|
|
{
|
|
errno = EMFILE;
|
|
return (-1);
|
|
};
|
|
|
|
// path = getfullpath(name);
|
|
|
|
err = get_fileinfo(filename, &info);
|
|
|
|
if( flags & O_EXCL &&
|
|
flags & O_CREAT )
|
|
{
|
|
if( !err )
|
|
{
|
|
errno = EEXIST;
|
|
return (-1);
|
|
};
|
|
}
|
|
|
|
if( err )
|
|
{
|
|
if(flags & O_CREAT)
|
|
err=create_file(filename);
|
|
if( err )
|
|
{
|
|
errno = EACCES;
|
|
return -1;
|
|
};
|
|
};
|
|
|
|
if( flags & O_TRUNC )
|
|
set_file_size(filename, 0);
|
|
|
|
ioh = &__io_tab[hid];
|
|
|
|
rwmode = flags & ( O_RDONLY | O_WRONLY | O_RDWR );
|
|
|
|
iomode = 0;
|
|
offset = 0;
|
|
|
|
if( rwmode == O_RDWR )
|
|
iomode |= _READ | _WRITE;
|
|
else if( rwmode == O_RDONLY)
|
|
iomode |= _READ;
|
|
else if( rwmode == O_WRONLY)
|
|
iomode |= _WRITE;
|
|
|
|
if( flags & O_APPEND )
|
|
{
|
|
iomode |= _APPEND;
|
|
offset = info.size;
|
|
};
|
|
|
|
if( flags & (O_BINARY|O_TEXT) )
|
|
{
|
|
if( flags & O_BINARY )
|
|
iomode |= _BINARY;
|
|
} else
|
|
iomode |= _BINARY;
|
|
|
|
ioh->name = strdup(filename);
|
|
ioh->offset = offset;
|
|
ioh->mode = iomode;
|
|
ioh->read = read_file;
|
|
ioh->write = write_file;
|
|
|
|
return hid;
|
|
};
|
|
|
|
|