/* $OpenBSD: ln.c,v 1.13 2005/12/02 20:36:56 cloder Exp $ */ /* $NetBSD: ln.c,v 1.10 1995/03/21 09:06:10 cgd Exp $ */ /* * Copyright (c) 1987, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1987, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static const char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94"; #else static const char rcsid[] = "$OpenBSD: ln.c,v 1.13 2005/12/02 20:36:56 cloder Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include int dirflag; /* Undocumented directory flag. */ int fflag; /* Unlink existing files. */ int hflag; /* Check new name for symlink first. */ int sflag; /* Symbolic, not hard, link. */ /* System link call. */ int (*linkf)(const char *, const char *); int linkit(char *, char *, int); void usage(void); int main(int argc, char *argv[]) { struct stat sb; int ch, exitval; char *sourcedir; while ((ch = getopt(argc, argv, "Ffhns")) != -1) switch (ch) { case 'F': dirflag = 1; /* XXX: deliberately undocumented. */ break; case 'f': fflag = 1; break; case 'h': case 'n': hflag = 1; break; case 's': sflag = 1; break; default: usage(); } argv += optind; argc -= optind; linkf = sflag ? symlink : link; switch(argc) { case 0: usage(); case 1: /* ln target */ exit(linkit(argv[0], ".", 1)); case 2: /* ln target source */ exit(linkit(argv[0], argv[1], 0)); } /* ln target1 target2 directory */ sourcedir = argv[argc - 1]; if (stat(sourcedir, &sb)) err(1, "%s", sourcedir); if (!S_ISDIR(sb.st_mode)) usage(); for (exitval = 0; *argv != sourcedir; ++argv) exitval |= linkit(*argv, sourcedir, 1); exit(exitval); } int linkit(char *target, char *source, int isdir) { struct stat sb; char *p, path[MAXPATHLEN]; int (*statf)(const char *, struct stat *); int n; if (!sflag) { /* If target doesn't exist, quit now. */ if (stat(target, &sb)) { warn("%s", target); return (1); } /* Only symbolic links to directories, unless -F option used. */ if (!dirflag && S_ISDIR(sb.st_mode)) { errno = EISDIR; warn("%s", target); return (1); } } statf = hflag ? lstat : stat; /* If the source is a directory, append the target's name. */ if (isdir || (!statf(source, &sb) && S_ISDIR(sb.st_mode))) { if ((p = basename(target)) == NULL) { warn("%s", target); return (1); } n = snprintf(path, sizeof(path), "%s/%s", source, p); if (n < 0 || n >= sizeof(path)) { errno = ENAMETOOLONG; warn("%s/%s", source, p); return (1); } source = path; } /* * If the file exists, and -f was specified, unlink it. * Attempt the link. */ if ((fflag && unlink(source) < 0 && errno != ENOENT) || (*linkf)(target, source)) { warn("%s", source); return (1); } return (0); } void usage(void) { extern char *__progname; (void)fprintf(stderr, "usage: %s [-fhns] sourcefile [targetfile]\n" " %s [-fs] sourcefile ... [targetdir]\n", __progname, __progname); exit(1); }