kolibrios/contrib/sdk/sources/newlib/libc/sys/open.c

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/* 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;
};