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