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Annotation of 43BSDTahoe/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19: static char sccsid[] = "@(#)readdir.c  5.4 (Berkeley) 6/18/88";
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: #include <sys/param.h>
                     23: #include <sys/dir.h>
                     24: 
                     25: /*
                     26:  * get next entry in a directory.
                     27:  */
                     28: struct direct *
                     29: readdir(dirp)
                     30:        register DIR *dirp;
                     31: {
                     32:        register struct direct *dp;
                     33: 
                     34:        for (;;) {
                     35:                if (dirp->dd_loc == 0) {
                     36:                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 
                     37:                            DIRBLKSIZ);
                     38:                        if (dirp->dd_size <= 0)
                     39:                                return NULL;
                     40:                }
                     41:                if (dirp->dd_loc >= dirp->dd_size) {
                     42:                        dirp->dd_loc = 0;
                     43:                        continue;
                     44:                }
                     45:                dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
                     46:                if ((int)dp & 03)       /* bogus pointer check */
                     47:                        return NULL;
                     48:                if (dp->d_reclen <= 0 ||
                     49:                    dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc)
                     50:                        return NULL;
                     51:                dirp->dd_loc += dp->d_reclen;
                     52:                if (dp->d_ino == 0)
                     53:                        continue;
                     54:                return (dp);
                     55:        }
                     56: }

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