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