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Annotation of 43BSDTahoe/bin/ln.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1987 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: char copyright[] =
        !            20: "@(#) Copyright (c) 1987 Regents of the University of California.\n\
        !            21:  All rights reserved.\n";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #ifndef lint
        !            25: static char sccsid[] = "@(#)ln.c       4.11 (Berkeley) 6/18/88";
        !            26: #endif /* not lint */
        !            27: 
        !            28: #include <sys/param.h>
        !            29: #include <sys/stat.h>
        !            30: #include <stdio.h>
        !            31: #include <errno.h>
        !            32: 
        !            33: static int     fflag,                          /* undocumented force flag */
        !            34:                sflag,                          /* symbolic, not hard, link */
        !            35:                (*linkf)();                     /* system link call */
        !            36: 
        !            37: main(argc, argv)
        !            38:        int     argc;
        !            39:        char    **argv;
        !            40: {
        !            41:        extern int      optind;
        !            42:        struct stat     buf;
        !            43:        int     ch, exitval, link(), symlink();
        !            44:        char    *sourcedir;
        !            45: 
        !            46:        while ((ch = getopt(argc, argv, "fs")) != EOF)
        !            47:                switch((char)ch) {
        !            48:                case 'f':
        !            49:                        fflag = 1;
        !            50:                        break;
        !            51:                case 's':
        !            52:                        sflag = 1;
        !            53:                        break;
        !            54:                case '?':
        !            55:                default:
        !            56:                        usage();
        !            57:                }
        !            58: 
        !            59:        argv += optind;
        !            60:        argc -= optind;
        !            61: 
        !            62:        linkf = sflag ? symlink : link;
        !            63: 
        !            64:        switch(argc) {
        !            65:        case 0:
        !            66:                usage();
        !            67:        case 1:                         /* ln target */
        !            68:                exit(linkit(argv[0], ".", 1));
        !            69:        case 2:                         /* ln target source */
        !            70:                exit(linkit(argv[0], argv[1], 0));
        !            71:        default:                        /* ln target1 target2 directory */
        !            72:                sourcedir = argv[argc - 1];
        !            73:                if (stat(sourcedir, &buf)) {
        !            74:                        perror(sourcedir);
        !            75:                        exit(1);
        !            76:                }
        !            77:                if ((buf.st_mode & S_IFMT) != S_IFDIR)
        !            78:                        usage();
        !            79:                for (exitval = 0; *argv != sourcedir; ++argv)
        !            80:                        exitval |= linkit(*argv, sourcedir, 1);
        !            81:                exit(exitval);
        !            82:        }
        !            83:        /*NOTREACHED*/
        !            84: }
        !            85: 
        !            86: static
        !            87: linkit(target, source, isdir)
        !            88:        char    *target, *source;
        !            89:        int     isdir;
        !            90: {
        !            91:        extern int      errno;
        !            92:        struct stat     buf;
        !            93:        char    path[MAXPATHLEN],
        !            94:                *cp, *rindex(), *strcpy();
        !            95: 
        !            96:        if (!sflag) {
        !            97:                /* if target doesn't exist, quit now */
        !            98:                if (stat(target, &buf)) {
        !            99:                        perror(target);
        !           100:                        return(1);
        !           101:                }
        !           102:                /* only symbolic links to directories, unless -f option used */
        !           103:                if (!fflag && (buf.st_mode & S_IFMT) == S_IFDIR) {
        !           104:                        printf("%s is a directory.\n", target);
        !           105:                        return(1);
        !           106:                }
        !           107:        }
        !           108: 
        !           109:        /* if the source is a directory, append the target's name */
        !           110:        if (isdir || !stat(source, &buf) && (buf.st_mode & S_IFMT) == S_IFDIR) {
        !           111:                if (!(cp = rindex(target, '/')))
        !           112:                        cp = target;
        !           113:                else
        !           114:                        ++cp;
        !           115:                (void)sprintf(path, "%s/%s", source, cp);
        !           116:                source = path;
        !           117:        }
        !           118: 
        !           119:        if ((*linkf)(target, source)) {
        !           120:                perror(source);
        !           121:                return(1);
        !           122:        }
        !           123:        return(0);
        !           124: }
        !           125: 
        !           126: static
        !           127: usage()
        !           128: {
        !           129:        fputs("usage:\tln [-s] targetname [sourcename]\n\tln [-s] targetname1 targetname2 [... targetnameN] sourcedirectory\n", stderr);
        !           130:        exit(1);
        !           131: }

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