75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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#include <fcntl.h>
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#include "util.h"
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int open(char const *path, int flags, ...)
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{
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ENOTSUP_IF_NOT_FUGUE(-1);
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uint16_t *fcpath = utf8_to_fc_alloc(path, u"\\\\fls0\\");
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int fd, err, rc = -1;
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if(!fcpath) {
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errno = ENOMEM;
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return -1;
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}
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/* Open mode */
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int bfile_mode = BFile_ReadOnly;
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if(flags & O_WRONLY)
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bfile_mode = BFile_WriteOnly;
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else if(flags & O_RDWR)
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bfile_mode = BFile_ReadWrite;
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/* Exclusive creation requires the file to be created by the call */
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bool excl = (flags & O_EXCL) && (flags & O_CREAT);
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/* Truncation requires the file to be removed/recreated */
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bool trunc = (flags & O_TRUNC) && (flags & O_CREAT);
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/* Try and open the file normally, unless O_TRUNC is specified without
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O_EXCL, in which case we simply delete and recreate the file. */
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fd = BFile_EntryNotFound;
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if(excl || !trunc)
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fd = BFile_Open(fcpath, bfile_mode);
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/* If the file exists and O_EXCL was requested, fail. */
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if(fd >= 0 && excl) {
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BFile_Close(fd);
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errno = EEXIST;
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return -1;
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}
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/* If O_TRUNC is requested and either the file exists or O_CREAT is
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set, temporarily remove it. */
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if((flags & O_TRUNC) && (fd >= 0 || (flags & O_CREAT))) {
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if(fd >= 0) BFile_Close(fd);
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BFile_Remove(fcpath);
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fd = BFile_EntryNotFound;
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}
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/* If the file does not exist and O_CREAT is set, create it */
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if((flags & O_CREAT) && ((flags & O_TRUNC) || fd < 0)) {
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int size = 0;
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err = BFile_Create(fcpath, BFile_File, &size);
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if(err < 0) {
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errno = bfile_error_to_errno(err);
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goto end;
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}
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fd = BFile_Open(fcpath, bfile_mode);
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}
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if(fd < 0) {
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errno = bfile_error_to_errno(fd);
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goto end;
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}
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/* If O_APPEND is set, move to the end of the file */
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if((flags & O_APPEND))
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BFile_Seek(fd, BFile_Size(fd));
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/* Return the now-open file descriptor */
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rc = fd;
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end:
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free(fcpath);
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return rc;
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}
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