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Annotation of coherent/b/lib/libc/ndir/readdir.c, revision 1.1.1.1

1.1       root        1: /*
                      2:        readdir -- read next entry from a directory stream
                      3: 
                      4:        last edit:      25-Apr-1987     D A Gwyn
                      5: */
                      6: 
                      7: #ifdef COHERENT
                      8: #include       <errno.h>
                      9: #else
                     10: #include       <sys/errno.h>
                     11: #endif
                     12: 
                     13: #include       <sys/types.h>
                     14: #include       "dirent.h"
                     15: 
                     16: extern int     getdents();             /* SVR3 system call, or emulation */
                     17: 
                     18: extern int     errno;
                     19: 
                     20: #ifndef NULL
                     21: #define        NULL    0
                     22: #endif
                     23: 
                     24: 
                     25: struct dirent *
                     26: readdir( dirp )
                     27:        register DIR            *dirp;  /* stream from opendir() */
                     28:        {
                     29:        register struct dirent  *dp;    /* -> directory data */
                     30: 
                     31: #if DBG
                     32:        printf("In readdir(dirp = %x, buffer= %x\n",(int) dirp,dirp->dd_buf);
                     33:        printf("fd= %d; loc= %d; size=%d.",dirp->dd_fd,dirp->dd_loc,dirp->dd_size);
                     34: 
                     35: #endif
                     36:        if ( dirp == NULL || dirp->dd_buf == NULL )
                     37:                {
                     38:                errno = EFAULT;
                     39:                return NULL;            /* invalid pointer */
                     40:                }
                     41: 
                     42:        do      {
                     43:                if ( dirp->dd_loc >= dirp->dd_size )    /* empty or obsolete */
                     44:                        dirp->dd_loc = dirp->dd_size = 0;
                     45: 
                     46:                if ( dirp->dd_size == 0 /* need to refill buffer */
                     47:                  && (dirp->dd_size =
                     48:                        getdents( dirp->dd_fd, dirp->dd_buf, (unsigned)DIRBUF )
                     49: 
                     50:                     ) <= 0
                     51:                   )
                     52: 
                     53:                        return NULL;    /* EOF or error */
                     54: #if DBG
                     55:        printf("dirp is good.\n");
                     56: #endif
                     57: 
                     58:                dp = (struct dirent *) (&(dirp->dd_buf[dirp->dd_loc]));
                     59: #if DBG
                     60:        printf("buffer = %x, ptr = %x\n",dirp->dd_buf, dp);
                     61: #endif
                     62:                dirp->dd_loc += dp->d_reclen;
                     63: #ifdef DBG
                     64:        printf("readdir: dir. buffer loc= %d\n",dirp->dd_loc);
                     65:        printf("\tinode = %D\n",dp->d_ino);
                     66: #endif
                     67:                }
                     68:        while ( dp->d_ino == 0L );      /* don't rely on getdents() */
                     69: 
                     70: #if DBG
                     71: printf ("readdir: name: %s; inode %D; offset %D; reclen %d\n",dp->d_name,
                     72:        dp->d_ino, dp->d_off, dp->d_reclen);
                     73: #endif
                     74:        return dp;
                     75:        }
                     76: 
                     77: 
                     78: 
                     79: 
                     80: 
                     81: 
                     82: 
                     83: 

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