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Annotation of 43BSD/lib/libc/gen/readdir.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)readdir.c  5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: #include <sys/param.h>
                     12: #include <sys/dir.h>
                     13: 
                     14: /*
                     15:  * get next entry in a directory.
                     16:  */
                     17: struct direct *
                     18: readdir(dirp)
                     19:        register DIR *dirp;
                     20: {
                     21:        register struct direct *dp;
                     22: 
                     23:        for (;;) {
                     24:                if (dirp->dd_loc == 0) {
                     25:                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 
                     26:                            DIRBLKSIZ);
                     27:                        if (dirp->dd_size <= 0)
                     28:                                return NULL;
                     29:                }
                     30:                if (dirp->dd_loc >= dirp->dd_size) {
                     31:                        dirp->dd_loc = 0;
                     32:                        continue;
                     33:                }
                     34:                dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
                     35:                if (dp->d_reclen <= 0 ||
                     36:                    dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc)
                     37:                        return NULL;
                     38:                dirp->dd_loc += dp->d_reclen;
                     39:                if (dp->d_ino == 0)
                     40:                        continue;
                     41:                return (dp);
                     42:        }
                     43: }

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