65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
#ifndef _SYS_DIRENT_H_
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#define _SYS_DIRENT_H_
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#include <sys/cdefs.h>
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#include <sys/featuretest.h>
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#include <minix/dirent.h>
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/*
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* The dirent structure defines the format of directory entries returned by
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* the getdents(2) system call.
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*/
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struct dirent { /* Largest entry (8 slots) */
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ino_t d_ino; /* I-node number */
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off_t d_off; /* Offset in directory */
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unsigned short d_reclen; /* Length of this record */
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char d_name[1]; /* Null terminated name */
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};
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#if defined(_NETBSD_SOURCE)
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#define d_fileno d_ino
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#endif
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/*
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* The _DIRENT_ALIGN macro returns the alignment of struct dirent. It
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* is used to check for bogus pointers and to calculate in advance the
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* memory required to store a dirent.
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* Unfortunately Minix doesn't use any standard alignment in dirents
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* at the moment, so, in order to calculate a safe dirent size, we add
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* an arbitrary number of bytes to the structure (_DIRENT_PAD), and we
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* set _DIRENT_ALIGN to zero to pass the pointers checks.
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* Please, FIXME.
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*/
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#define _DIRENT_ALIGN(dp) 0
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#define _DIRENT_PAD 64
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/*
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* The _DIRENT_NAMEOFF macro returns the offset of the d_name field in
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* struct dirent
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*/
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#define _DIRENT_NAMEOFF(dp) \
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((char *)(void *)&(dp)->d_name - (char *)(void *)dp)
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/*
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* The _DIRENT_RECLEN macro gives the minimum record length which will hold
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* a name of size "namlen".
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*/
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#define _DIRENT_RECLEN(dp, namlen) \
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((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + _DIRENT_PAD + _DIRENT_ALIGN(dp)) & \
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~_DIRENT_ALIGN(dp))
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/*
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* The _DIRENT_SIZE macro returns the minimum record length required for
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* name name stored in the current record.
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*/
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#define _DIRENT_SIZE(dp) _DIRENT_RECLEN(dp, strlen(dp->d_name))
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/*
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* The _DIRENT_NEXT macro advances to the next dirent record.
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*/
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#define _DIRENT_NEXT(dp) ((void *)((char *)(void *)(dp) + (dp)->d_reclen))
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/*
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* The _DIRENT_MINSIZE returns the size of an empty (invalid) record.
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*/
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#define _DIRENT_MINSIZE(dp) _DIRENT_RECLEN(dp, 0)
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#endif /* !_SYS_DIRENT_H_ */
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