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Annotation of researchv9/cmd/cfront/CC/dir.h, revision 1.1

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

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