/*- * 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. * 4. 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. */ #if 0 #ifndef lint static char const copyright[] = "@(#) Copyright (c) 1987, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94"; #endif /* not lint */ #endif #include __FBSDID("$FreeBSD: src/bin/ln/ln.c,v 1.34 2006/02/14 11:08:05 glebius Exp $"); #include #include #include #include #include #include #include #include #include int fflag; /* Unlink existing files. */ int Fflag; /* Remove empty directories also. */ int hflag; /* Check new name for symlink first. */ int iflag; /* Interactive mode. */ int sflag; /* Symbolic, not hard, link. */ int vflag; /* Verbose output. */ /* System link call. */ int (*linkf)(const char *, const char *); char linkch; int linkit(const char *, const char *, int); void usage(void); int main(int argc, char *argv[]) { struct stat sb; char *p, *sourcedir; int ch, exitval; if (argc < 1) usage(); /* * Test for the special case where the utility is called as * "link", for which the functionality provided is greatly * simplified. */ if ((p = rindex(argv[0], '/')) == NULL) p = argv[0]; else ++p; if (strcmp(p, "link") == 0) { while (getopt(argc, argv, "") != -1) usage(); argc -= optind; argv += optind; if (argc != 2) usage(); linkf = link; exit(linkit(argv[0], argv[1], 0)); } while ((ch = getopt(argc, argv, "Ffhinsv")) != -1) switch (ch) { case 'F': Fflag = 1; break; case 'f': fflag = 1; iflag = 0; break; case 'h': case 'n': hflag = 1; break; case 'i': iflag = 1; fflag = 0; break; case 's': sflag = 1; break; case 'v': vflag = 1; break; case '?': default: usage(); } argv += optind; argc -= optind; linkf = sflag ? symlink : link; linkch = sflag ? '-' : '='; if (sflag == 0) Fflag = 0; if (Fflag == 1 && iflag == 0) fflag = 1; switch(argc) { case 0: usage(); /* NOTREACHED */ case 1: /* ln target */ exit(linkit(argv[0], ".", 1)); case 2: /* ln target source */ exit(linkit(argv[0], argv[1], 0)); default: ; } /* ln target1 target2 directory */ sourcedir = argv[argc - 1]; if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) { /* * We were asked not to follow symlinks, but found one at * the target--simulate "not a directory" error */ errno = ENOTDIR; err(1, "%s", sourcedir); } 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(const char *target, const char *source, int isdir) { struct stat sb; const char *p; int ch, exists, first; char path[PATH_MAX]; if (!sflag) { /* If target doesn't exist, quit now. */ if (stat(target, &sb)) { warn("%s", target); return (1); } /* Only symbolic links to directories. */ if (S_ISDIR(sb.st_mode)) { errno = EISDIR; warn("%s", target); return (1); } } /* * If the source is a directory (and not a symlink if hflag), * append the target's name. */ if (isdir || (lstat(source, &sb) == 0 && S_ISDIR(sb.st_mode)) || (!hflag && stat(source, &sb) == 0 && S_ISDIR(sb.st_mode))) { if ((p = strrchr(target, '/')) == NULL) p = target; else ++p; if (snprintf(path, sizeof(path), "%s/%s", source, p) >= (ssize_t)sizeof(path)) { errno = ENAMETOOLONG; warn("%s", target); return (1); } source = path; } exists = !lstat(source, &sb); /* * If the file exists, then unlink it forcibly if -f was specified * and interactively if -i was specified. */ if (fflag && exists) { if (Fflag && S_ISDIR(sb.st_mode)) { if (rmdir(source)) { warn("%s", source); return (1); } } else if (unlink(source)) { warn("%s", source); return (1); } } else if (iflag && exists) { fflush(stdout); fprintf(stderr, "replace %s? ", source); first = ch = getchar(); while(ch != '\n' && ch != EOF) ch = getchar(); if (first != 'y' && first != 'Y') { fprintf(stderr, "not replaced\n"); return (1); } if (Fflag && S_ISDIR(sb.st_mode)) { if (rmdir(source)) { warn("%s", source); return (1); } } else if (unlink(source)) { warn("%s", source); return (1); } } /* Attempt the link. */ if ((*linkf)(target, source)) { warn("%s", source); return (1); } if (vflag) (void)printf("%s %c> %s\n", source, linkch, target); return (0); } void usage(void) { (void)fprintf(stderr, "%s\n%s\n%s\n", "usage: ln [-Ffhinsv] source_file [target_file]", " ln [-Ffhinsv] source_file ... target_dir", " link source_file target_file"); exit(1); }