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Annotation of 43BSD/contrib/rn/ndir.c, revision 1.1

1.1     ! root        1: /* $Header: ndir.c,v 4.3.1.3 85/05/23 11:19:24 lwall Exp $
        !             2:  *
        !             3:  * $Log:       ndir.c,v $
        !             4:  * Revision 4.3.1.3  85/05/23  11:19:24  lwall
        !             5:  * Oops, shouldn't have included sys/types.h again.
        !             6:  * 
        !             7:  * Revision 4.3.1.2  85/05/15  14:46:00  lwall
        !             8:  * Changed short to ino_t, which may be ushort on some systems.
        !             9:  * 
        !            10:  * Revision 4.3.1.1  85/05/10  11:35:34  lwall
        !            11:  * Branch for patches.
        !            12:  * 
        !            13:  * Revision 4.3  85/05/01  11:42:55  lwall
        !            14:  * Baseline for release with 4.3bsd.
        !            15:  * 
        !            16:  */
        !            17: 
        !            18: #include "EXTERN.h"
        !            19: #include "common.h"
        !            20: #include "INTERN.h"
        !            21: #include "ndir.h"
        !            22: 
        !            23: #ifdef USENDIR
        !            24: /*
        !            25:  * support for Berkeley directory reading routine on a V7 file system
        !            26:  */
        !            27: 
        !            28: /*
        !            29:  * open a directory.
        !            30:  */
        !            31: DIR *
        !            32: opendir(name)
        !            33: char *name;
        !            34: {
        !            35:        register DIR *dirp;
        !            36:        register int fd;
        !            37: 
        !            38:        if ((fd = open(name, 0)) == -1)
        !            39:                return NULL;
        !            40:        if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
        !            41:                close (fd);
        !            42:                return NULL;
        !            43:        }
        !            44:        dirp->dd_fd = fd;
        !            45:        dirp->dd_loc = 0;
        !            46:        return dirp;
        !            47: }
        !            48: 
        !            49: /*
        !            50:  * read an old style directory entry and present it as a new one
        !            51:  */
        !            52: #ifndef pyr
        !            53: #define        ODIRSIZ 14
        !            54: 
        !            55: struct olddirect {
        !            56:        ino_t   od_ino;
        !            57:        char    od_name[ODIRSIZ];
        !            58: };
        !            59: #else  an Pyramid in the ATT universe
        !            60: #define        ODIRSIZ 248
        !            61: 
        !            62: struct olddirect {
        !            63:        long    od_ino;
        !            64:        short   od_fill1, od_fill2;
        !            65:        char    od_name[ODIRSIZ];
        !            66: };
        !            67: #endif
        !            68: 
        !            69: /*
        !            70:  * get next entry in a directory.
        !            71:  */
        !            72: struct direct *
        !            73: readdir(dirp)
        !            74: register DIR *dirp;
        !            75: {
        !            76:        register struct olddirect *dp;
        !            77:        static struct direct dir;
        !            78: 
        !            79:        for (;;) {
        !            80:                if (dirp->dd_loc == 0) {
        !            81:                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
        !            82:                            DIRBLKSIZ);
        !            83:                        if (dirp->dd_size <= 0)
        !            84:                                return NULL;
        !            85:                }
        !            86:                if (dirp->dd_loc >= dirp->dd_size) {
        !            87:                        dirp->dd_loc = 0;
        !            88:                        continue;
        !            89:                }
        !            90:                dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
        !            91:                dirp->dd_loc += sizeof(struct olddirect);
        !            92:                if (dp->od_ino == 0)
        !            93:                        continue;
        !            94:                dir.d_ino = dp->od_ino;
        !            95:                strncpy(dir.d_name, dp->od_name, ODIRSIZ);
        !            96:                dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */
        !            97:                dir.d_namlen = strlen(dir.d_name);
        !            98:                dir.d_reclen = DIRSIZ(&dir);
        !            99:                return (&dir);
        !           100:        }
        !           101: }
        !           102: 
        !           103: /*
        !           104:  * close a directory.
        !           105:  */
        !           106: void
        !           107: closedir(dirp)
        !           108: register DIR *dirp;
        !           109: {
        !           110:        close(dirp->dd_fd);
        !           111:        dirp->dd_fd = -1;
        !           112:        dirp->dd_loc = 0;
        !           113:        free(dirp);
        !           114: }
        !           115: #endif USENDIR

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