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Annotation of 43BSDReno/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.
                      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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