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Annotation of 43BSD/contrib/mh/miscellany/libndir/readdir.c, revision 1.1

1.1     ! root        1: static char sccsid[] = "@(#)readdir.c  4.1     (Berkeley)      83/03/21";
        !             2: 
        !             3: #include <sys/types.h>
        !             4: #include <dir.h>
        !             5: 
        !             6: /*
        !             7:  * read an old stlye directory entry and present it as a new one
        !             8:  */
        !             9: #define        ODIRSIZ 14
        !            10: 
        !            11: struct olddirect {
        !            12:        ino_t   od_ino;
        !            13:        char    od_name[ODIRSIZ];
        !            14: };
        !            15: 
        !            16: /*
        !            17:  * get next entry in a directory.
        !            18:  */
        !            19: struct direct *
        !            20: readdir(dirp)
        !            21:        register DIR *dirp;
        !            22: {
        !            23:        register struct olddirect *dp;
        !            24:        static struct direct dir;
        !            25: 
        !            26:        for (;;) {
        !            27:                if (dirp->dd_loc == 0) {
        !            28:                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, 
        !            29:                            DIRBLKSIZ);
        !            30:                        if (dirp->dd_size <= 0)
        !            31:                                return NULL;
        !            32:                }
        !            33:                if (dirp->dd_loc >= dirp->dd_size) {
        !            34:                        dirp->dd_loc = 0;
        !            35:                        continue;
        !            36:                }
        !            37:                dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
        !            38:                dirp->dd_loc += sizeof(struct olddirect);
        !            39:                if (dp->od_ino == 0)
        !            40:                        continue;
        !            41:                dir.d_ino = dp->od_ino;
        !            42:                strncpy(dir.d_name, dp->od_name, ODIRSIZ);
        !            43:                dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
        !            44:                dir.d_namlen = strlen(dir.d_name);
        !            45:                dir.d_reclen = DIRBLKSIZ;
        !            46:                return (&dir);
        !            47:        }
        !            48: }

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