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Annotation of coherent/d/usr/bin/pax/shipping/opendir.c, revision 1.1.1.1

1.1       root        1: /*
                      2:        opendir -- open a directory stream
                      3: 
                      4:        last edit:      25-Apr-1987     D A Gwyn
                      5: */
                      6: #include       <stdio.h>
                      7: #include       <errno.h>
                      8: #include       <sys/types.h>
                      9: #include       <sys/stat.h>
                     10: #include       <ndir.h>
                     11: 
                     12: #ifdef BRL
                     13: #define open   _open                   /* avoid emulation overhead */
                     14: #endif
                     15: 
                     16: typedef char   *pointer;               /* (void *) if you have it */
                     17: 
                     18: extern void    free();
                     19: extern pointer malloc();
                     20: extern int     open(), close(), fstat();
                     21: 
                     22: extern int     errno;
                     23: 
                     24: #ifndef NULL
                     25: #define        NULL    0
                     26: #endif
                     27: 
                     28: #ifndef O_RDONLY
                     29: #define        O_RDONLY        0
                     30: #endif
                     31: 
                     32: #ifndef S_ISDIR                                /* macro to test for directory file */
                     33: #define        S_ISDIR( mode )         (((mode) & S_IFMT) == S_IFDIR)
                     34: #endif
                     35: 
                     36: DIR *
                     37: opendir( dirname )
                     38: char           *dirname;       /* name of directory */
                     39: {
                     40:        register DIR    *dirp;          /* -> malloc'ed storage */
                     41:        register int    fd;             /* file descriptor for read */
                     42:        struct stat     sbuf;           /* result of fstat() */
                     43: 
                     44:        if ( (fd = open( dirname, 0)) < 0 ) {
                     45:                fprintf(stderr, "Cannot open directory %s\n", dirname);
                     46:                return NULL;            /* errno set by open() */
                     47:        }
                     48:        if ( fstat( fd, &sbuf ) != 0 || !S_ISDIR( sbuf.st_mode ) )
                     49:                {
                     50:                fprintf(stderr, "Cannot stat directory %s\n", dirname);
                     51:                (void)close( fd );
                     52:                errno = ENOTDIR;
                     53:                return NULL;            /* not a directory */
                     54:                }
                     55:        
                     56:        if ((dirp = (DIR *)malloc( sizeof(DIR) )) == NULL
                     57:          || (dirp->dd_buf = (char *)malloc( (unsigned)DIRBUF )) == NULL
                     58:           )    {
                     59:                register int    serrno = errno;
                     60:                                        /* errno set to ENOMEM by sbrk() */
                     61: 
                     62:                if ( dirp != NULL )
                     63:                        free( (pointer)dirp );
                     64: 
                     65:                (void)close( fd );
                     66:                errno = serrno;
                     67:                fprintf(stderr, "Not enough memory %s\n", dirname);
                     68:                return NULL;            /* not enough memory */
                     69:                }
                     70: 
                     71:        dirp->dd_fd = fd;
                     72:        dirp->dd_loc = dirp->dd_size = 0;       /* refill needed */
                     73: 
                     74:        return dirp;
                     75:        }

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