/* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. * * @(#) Copyright (c) 1987, 1993, 1994 The Regents of the University of California. All rights reserved. * @(#)ln.c 8.2 (Berkeley) 3/31/94 * $FreeBSD: src/bin/ln/ln.c,v 1.15.2.4 2002/07/12 07:34:38 tjr Exp $ * $DragonFly: src/bin/ln/ln.c,v 1.11 2006/09/25 09:27:21 corecode Exp $ */ #include #include #include #include #include #include #include #include static int fflag; /* Unlink existing files. */ static int hflag; /* Check new name for symlink first. */ static int iflag; /* Interactive mode. */ static int sflag; /* Symbolic, not hard, link. */ static int vflag; /* Verbose output. */ /* System link call. */ static int (*linkf)(const char *, const char *); static char linkch; static int linkit(const char *, const char *, int); static void usage(void); int main(int argc, char *argv[]) { struct stat sb; char *p, *sourcedir; int ch, exitval; /* * Test for the special case where the utility is called as * "link", for which the functionality provided is greatly * simplified. */ if ((p = strrchr(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, "fhinsv")) != -1) { switch (ch) { 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 ? '-' : '='; 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 */ errc(1, ENOTDIR, "%s", sourcedir); } if (stat(sourcedir, &sb) != 0) err(1, "%s", sourcedir); if (!S_ISDIR(sb.st_mode)) usage(); for (exitval = 0; *argv != sourcedir; ++argv) exitval |= linkit(*argv, sourcedir, 1); exit(exitval); } /* * Nomenclature warning! * * In this source "target" and "source" are used the opposite way they * are used in the ln(1) manual. Here "target" is the existing file and * "source" specifies the to-be-created link to "target". */ static 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) != 0) { 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) >= (int)sizeof(path)) { errno = ENAMETOOLONG; warn("%s", target); return (1); } source = path; } exists = (lstat(source, &sb) == 0); /* * If doing hard links and the source (destination) exists and it * actually is the same file like the target (existing file), we * complain that the files are identical. If -f is specified, we * accept the job as already done and return with success. */ if (exists && !sflag) { struct stat tsb; if (stat(target, &tsb) != 0) { warn("%s: disappeared", target); return (1); } if (tsb.st_dev == sb.st_dev && tsb.st_ino == sb.st_ino) { warnx("%s and %s are identical (not linked).", target, source); if (fflag) return (0); else return (1); } } /* * If the file exists, then unlink it forcibly if -f was specified * and interactively if -i was specified. */ if (fflag && exists) { if (unlink(source) != 0) { 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 (unlink(source) != 0) { warn("%s", source); return (1); } } /* Attempt the link. */ if ((*linkf)(target, source) != 0) { warn("%s", source); return (1); } if (vflag) printf("%s %c> %s\n", source, linkch, target); return (0); } static void usage(void) { fprintf(stderr, "%s\n%s\n%s\n", "usage: ln [-fhinsv] file1 file2", " ln [-fhinsv] file ... directory", " link file1 file2"); exit(1); }