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Annotation of researchv9/cmd/cfront/CC/dir.h, revision 1.1.1.1

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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