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Annotation of researchv10no/cmd/netnews/src/ndir.h, revision 1.1

1.1     ! root        1: 
        !             2: /*
        !             3:  * Copyright (c) 1982 Regents of the University of California
        !             4:  */
        !             5: 
        !             6: /* @(#)ndir.h 4.4 3/30/82 */
        !             7: 
        !             8: /*
        !             9:  * This sets the "page size" for directories.
        !            10:  * Requirements are DEV_BSIZE <= DIRBLKSIZ <= MINBSIZE with
        !            11:  * DIRBLKSIZ a power of two.
        !            12:  * Dennis Ritchie feels that directory pages should be atomic
        !            13:  * operations to the disk, so we use DEV_BSIZE.
        !            14:  */
        !            15: #define DIRBLKSIZ 512
        !            16: 
        !            17: /*
        !            18:  * This limits the directory name length. Its main constraint
        !            19:  * is that it appears twice in the user structure. (u. area)
        !            20:  */
        !            21: #define MAXNAMLEN 255
        !            22: 
        !            23: struct direct {
        !            24:        ino_t   d_ino;
        !            25:        short   d_reclen;
        !            26:        short   d_namlen;
        !            27:        char    d_name[MAXNAMLEN + 1];
        !            28:        /* typically shorter */
        !            29: };
        !            30: 
        !            31: struct _dirdesc {
        !            32:        int     dd_fd;
        !            33:        long    dd_loc;
        !            34:        long    dd_size;
        !            35:        char    dd_buf[DIRBLKSIZ];
        !            36: };
        !            37: 
        !            38: /*
        !            39:  * useful macros.
        !            40:  */
        !            41: #undef DIRSIZ
        !            42: #define DIRSIZ(dp) \
        !            43:     ((sizeof(struct direct) - MAXNAMLEN + (dp)->d_namlen + sizeof(ino_t) - 1) &\
        !            44:     ~(sizeof(ino_t) - 1))
        !            45: typedef        struct _dirdesc DIR;
        !            46: #ifndef        NULL
        !            47: #define        NULL    0
        !            48: #endif
        !            49: 
        !            50: /*
        !            51:  * functions defined on directories
        !            52:  */
        !            53: extern DIR *opendir();
        !            54: extern struct direct *readdir();
        !            55: extern long telldir();
        !            56: extern void seekdir();
        !            57: #define rewinddir(dirp)        seekdir((dirp), 0)
        !            58: extern void closedir();

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