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Annotation of 43BSDReno/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21: static char sccsid[] = "@(#)readdir.c  5.7 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/param.h>
        !            25: #include <dirent.h>
        !            26: 
        !            27: /*
        !            28:  * get next entry in a directory.
        !            29:  */
        !            30: struct dirent *
        !            31: readdir(dirp)
        !            32:        register DIR *dirp;
        !            33: {
        !            34:        register struct dirent *dp;
        !            35: 
        !            36:        for (;;) {
        !            37:                if (dirp->dd_loc == 0) {
        !            38:                        dirp->dd_size = getdirentries(dirp->dd_fd,
        !            39:                            dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
        !            40:                        if (dirp->dd_size <= 0)
        !            41:                                return NULL;
        !            42:                }
        !            43:                if (dirp->dd_loc >= dirp->dd_size) {
        !            44:                        dirp->dd_loc = 0;
        !            45:                        continue;
        !            46:                }
        !            47:                dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
        !            48:                if ((int)dp & 03)       /* bogus pointer check */
        !            49:                        return NULL;
        !            50:                if (dp->d_reclen <= 0 ||
        !            51:                    dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
        !            52:                        return NULL;
        !            53:                dirp->dd_loc += dp->d_reclen;
        !            54:                if (dp->d_ino == 0)
        !            55:                        continue;
        !            56:                return (dp);
        !            57:        }
        !            58: }

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