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Annotation of researchv10no/netfs/serv/bsdlibdir.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * read a directory, with the directory library routines
        !             3:  * bsd version: readdir header and structure have different names
        !             4:  *
        !             5:  * fill the buffer with directory entries of the form
        !             6:  *     nnnn tab filename NUL
        !             7:  * nnnn is the i-number, in decimal ascii
        !             8:  *
        !             9:  * return the number of bytes used in the buffer, or 0 (EOF) or -1 (error)
        !            10:  * leave *offp set to something we'll want to use next time.
        !            11:  */
        !            12: 
        !            13: #include <rf.h>
        !            14: #include "zarf.h"
        !            15: #include <sys/types.h> /* for pointless u_long and friends */
        !            16: #include <sys/dir.h>
        !            17: #define        dirent  direct
        !            18: 
        !            19: /*
        !            20:  * our private context
        !            21:  */
        !            22: #define        MAXDIRS 128
        !            23: typedef struct {
        !            24:        Rfile *f;
        !            25:        DIR *dfile;
        !            26: } Dirfile;
        !            27: static Dirfile dirfiles[MAXDIRS];
        !            28: static Dirfile *ftod();
        !            29: 
        !            30: dodirread(f, buf, size, off, offp)
        !            31: Rfile *f;
        !            32: char *buf;
        !            33: register int size;
        !            34: long off;
        !            35: long *offp;
        !            36: {
        !            37:        extern int errno;
        !            38:        static char tbuf[MAXNAMLEN+1+20];       /* room for NUL and some digits */
        !            39:        register struct dirent *dp;
        !            40:        register Dirfile *dirf;
        !            41:        register int n;
        !            42:        register char *p;
        !            43: 
        !            44:        dirf = ftod(f);
        !            45:        if (dirf == NULL) {
        !            46:                fserrno = RFEINVAL;
        !            47:                return (-1);
        !            48:        }
        !            49:        if (dirf->f == NULL) {
        !            50:                if ((dirf->dfile = opendir(fsp(f)->name)) == NULL) {
        !            51:                        fserrno = errno;        /* hope it's correct */
        !            52:                        return (-1);
        !            53:                }
        !            54:                dirf->f = f;
        !            55:        }
        !            56:        seekdir(dirf->dfile, off);
        !            57:        p = buf;
        !            58:        for (;;) {
        !            59:                if ((dp = readdir(dirf->dfile)) == NULL)
        !            60:                        break;
        !            61:                sprintf(tbuf, "%d\t%s", dp->d_ino, dp->d_name);
        !            62:                n = strlen(tbuf) + 1;
        !            63:                if (size < n)
        !            64:                        break;
        !            65:                strcpy(p, tbuf);
        !            66:                p += n;
        !            67:                size -= n;
        !            68:                off = telldir(dirf->dfile);
        !            69:        }
        !            70:        if (dp != NULL && p == buf) {   /* no room for anything */
        !            71:                fserrno = RFENOSPC;
        !            72:                return (-1);
        !            73:        }
        !            74:        *offp = off;
        !            75:        return (p - buf);
        !            76: }
        !            77: 
        !            78: static Dirfile *
        !            79: ftod(f)
        !            80: register Rfile *f;
        !            81: {
        !            82:        register Dirfile *dirf;
        !            83:        register Dirfile *empty;
        !            84: 
        !            85:        empty = NULL;
        !            86:        for (dirf = dirfiles; dirf < &dirfiles[MAXDIRS]; dirf++) {
        !            87:                if (dirf->f == f)
        !            88:                        return (dirf);
        !            89:                if (empty == NULL && dirf->f == NULL)
        !            90:                        empty = dirf;
        !            91:        }
        !            92:        return (empty);
        !            93: }
        !            94: 
        !            95: dodircleanup(f)
        !            96: Rfile *f;
        !            97: {
        !            98:        register Dirfile *dirf;
        !            99: 
        !           100:        if ((dirf = ftod(f)) == NULL || dirf->f == NULL)
        !           101:                return;
        !           102:        closedir(dirf->dfile);
        !           103:        dirf->f = NULL;
        !           104: }

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