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Annotation of Net2/stand/ls.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)ls.c        7.9 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: #include "sys/param.h"
        !            37: #include "ufs/dir.h"
        !            38: #include "saio.h"
        !            39: #include "sys/ttychars.h"
        !            40: 
        !            41: main()
        !            42: {
        !            43:        struct dinode *ip;
        !            44:        int fd;
        !            45: 
        !            46:        for (;;) {
        !            47:                if ((fd = getfile("ls", 0)) == -1)
        !            48:                        exit();
        !            49:                ip = &iob[fd - 3].i_ino;
        !            50:                if ((ip->di_mode & IFMT) != IFDIR) {
        !            51:                        printf("ls: not a directory\n");
        !            52:                        continue;
        !            53:                }
        !            54:                if (ip->di_size == 0) {
        !            55:                        printf("ls: zero length directory\n");
        !            56:                        continue;
        !            57:                }
        !            58:                ls(fd);
        !            59:        }
        !            60: }
        !            61: 
        !            62: #define CTRL(x)        (x&037)
        !            63: 
        !            64: getfile(prompt, mode)
        !            65:        char *prompt;
        !            66:        int mode;
        !            67: {
        !            68:        int fd;
        !            69:        char buf[100];
        !            70: 
        !            71:        do {
        !            72:                printf("%s: ", prompt);
        !            73:                gets(buf);
        !            74:                if (buf[0] == CTRL('d') && buf[1] == 0)
        !            75:                        return (-1);
        !            76:        } while ((fd = open(buf, mode)) <= 0);
        !            77:        return(fd);
        !            78: }
        !            79: 
        !            80: typedef struct direct  DP;
        !            81: static
        !            82: ls(fd)
        !            83:        register int fd;
        !            84: {
        !            85:        register int size;
        !            86:        register char *dp;
        !            87:        char dirbuf[DIRBLKSIZ];
        !            88: 
        !            89:        printf("\ninode\tname\n");
        !            90:        while ((size = read(fd, dirbuf, DIRBLKSIZ)) == DIRBLKSIZ)
        !            91:                for(dp = dirbuf; (dp < (dirbuf + size)) &&
        !            92:                    (dp + ((DP *)dp)->d_reclen) < (dirbuf + size);
        !            93:                    dp += ((DP *)dp)->d_reclen) {
        !            94:                        if (((DP *)dp)->d_ino == 0)
        !            95:                                continue;
        !            96:                        if (((DP *)dp)->d_namlen > MAXNAMLEN+1) {
        !            97:                                printf("Corrupt file name length!  Run fsck soon!\n");
        !            98:                                return;
        !            99:                        }
        !           100:                        printf("%d\t%s\n", ((DP *)dp)->d_ino,
        !           101:                            ((DP *)dp)->d_name);
        !           102:                }
        !           103: }

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