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Annotation of 42BSD/lib/libc/gen/scandir.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)scandir.c  4.2 (Berkeley) 7/1/83";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Scan the directory dirname calling select to make a list of selected
        !             7:  * directory entries then sort using qsort and compare routine dcomp.
        !             8:  * Returns the number of entries and a pointer to a list of pointers to
        !             9:  * struct direct (through namelist). Returns -1 if there were any errors.
        !            10:  */
        !            11: 
        !            12: #include <sys/types.h>
        !            13: #include <sys/stat.h>
        !            14: #include <sys/dir.h>
        !            15: 
        !            16: scandir(dirname, namelist, select, dcomp)
        !            17:        char *dirname;
        !            18:        struct direct *(*namelist[]);
        !            19:        int (*select)(), (*dcomp)();
        !            20: {
        !            21:        register struct direct *d, *p, **names;
        !            22:        register int nitems;
        !            23:        register char *cp1, *cp2;
        !            24:        struct stat stb;
        !            25:        long arraysz;
        !            26:        DIR *dirp;
        !            27: 
        !            28:        if ((dirp = opendir(dirname)) == NULL)
        !            29:                return(-1);
        !            30:        if (fstat(dirp->dd_fd, &stb) < 0)
        !            31:                return(-1);
        !            32: 
        !            33:        /*
        !            34:         * estimate the array size by taking the size of the directory file
        !            35:         * and dividing it by a multiple of the minimum size entry. 
        !            36:         */
        !            37:        arraysz = (stb.st_size / 24);
        !            38:        names = (struct direct **)malloc(arraysz * sizeof(struct direct *));
        !            39:        if (names == NULL)
        !            40:                return(-1);
        !            41: 
        !            42:        nitems = 0;
        !            43:        while ((d = readdir(dirp)) != NULL) {
        !            44:                if (select != NULL && !(*select)(d))
        !            45:                        continue;       /* just selected names */
        !            46:                /*
        !            47:                 * Make a minimum size copy of the data
        !            48:                 */
        !            49:                p = (struct direct *)malloc(DIRSIZ(d));
        !            50:                if (p == NULL)
        !            51:                        return(-1);
        !            52:                p->d_ino = d->d_ino;
        !            53:                p->d_reclen = d->d_reclen;
        !            54:                p->d_namlen = d->d_namlen;
        !            55:                for (cp1 = p->d_name, cp2 = d->d_name; *cp1++ = *cp2++; );
        !            56:                /*
        !            57:                 * Check to make sure the array has space left and
        !            58:                 * realloc the maximum size.
        !            59:                 */
        !            60:                if (++nitems >= arraysz) {
        !            61:                        names = (struct direct **)realloc((char *)names,
        !            62:                                (stb.st_size/12) * sizeof(struct direct *));
        !            63:                        if (names == NULL)
        !            64:                                return(-1);
        !            65:                }
        !            66:                names[nitems-1] = p;
        !            67:        }
        !            68:        closedir(dirp);
        !            69:        if (nitems && dcomp != NULL)
        !            70:                qsort(names, nitems, sizeof(struct direct *), dcomp);
        !            71:        *namelist = names;
        !            72:        return(nitems);
        !            73: }
        !            74: 
        !            75: /*
        !            76:  * Alphabetic order comparison routine for those who want it.
        !            77:  */
        !            78: alphasort(d1, d2)
        !            79:        struct direct **d1, **d2;
        !            80: {
        !            81:        return(strcmp((*d1)->d_name, (*d2)->d_name));
        !            82: }

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