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Annotation of researchv10no/libc/gen/tmp/ndir.h, revision 1.1.1.1

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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