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Annotation of researchv10no/cmd/asd/ndir.h, revision 1.1.1.1

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

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