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Annotation of researchv10no/libc/gen/tmp/ndir.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1982 Regents of the University of California */
        !             2: /* and modified by pjw in 1986 */
        !             3: 
        !             4: /*
        !             5:  * this must be a power of 2 and a multiple of all the ones in the system
        !             6:  */
        !             7: #define DIRBLKSIZ 512
        !             8: 
        !             9: /*
        !            10:  * This limits the directory name length. Its main constraint
        !            11:  * is that it appears twice in the user structure. (u. area) in bsd systems
        !            12:  */
        !            13: #define MAXNAMLEN 255
        !            14: 
        !            15: struct direct {
        !            16:        unsigned long   d_ino;
        !            17:        short   d_reclen;
        !            18:        short   d_namlen;
        !            19:        char    d_name[MAXNAMLEN + 1];
        !            20:        /* typically shorter */
        !            21: };
        !            22: 
        !            23: struct _dirdesc {
        !            24:        int     dd_fd;
        !            25:        long    dd_loc;         /* where we left off in dd_buf */
        !            26:        long    dd_size;        /* bytes back from system */
        !            27:        long    dd_offset;      /* lseek at beginning of dd_buf */
        !            28:        char    dd_buf[DIRBLKSIZ];
        !            29: };
        !            30: 
        !            31: /*
        !            32:  * useful macros.
        !            33:  */
        !            34: #define NDIRSIZ(dp) \
        !            35:     ((sizeof(struct direct) - MAXNAMLEN + (dp)->d_namlen + sizeof(ino_t) - 1) &\
        !            36:     ~(sizeof(ino_t) - 1))
        !            37: typedef        struct _dirdesc DIR;
        !            38: #ifndef        NULL
        !            39: #define        NULL    0
        !            40: #endif
        !            41: 
        !            42: /*
        !            43:  * functions defined on directories
        !            44:  */
        !            45: extern DIR *opendir();
        !            46: extern struct direct *readdir();
        !            47: extern long telldir();
        !            48: extern void seekdir();
        !            49: #define rewinddir(dirp)        seekdir((dirp), 0)
        !            50: extern void closedir();

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