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Diffstat (limited to 'bin/ln/ln.c')
| -rw-r--r-- | bin/ln/ln.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/bin/ln/ln.c b/bin/ln/ln.c new file mode 100644 index 000000000000..c421fe0fa439 --- /dev/null +++ b/bin/ln/ln.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 1987 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. + */ + +#ifndef lint +char copyright[] = +"@(#) Copyright (c) 1987 Regents of the University of California.\n\ + All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)ln.c 4.15 (Berkeley) 2/24/91"; +#endif /* not lint */ + +#include <sys/param.h> +#include <sys/stat.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> + +static int dirflag, /* undocumented force flag */ + sflag, /* symbolic, not hard, link */ + (*linkf)(); /* system link call */ +static linkit(), usage(); + +main(argc, argv) + int argc; + char **argv; +{ + extern int optind; + struct stat buf; + int ch, exitval, link(), symlink(); + char *sourcedir; + + while ((ch = getopt(argc, argv, "Fs")) != EOF) + switch((char)ch) { + case 'F': + dirflag = 1; + break; + case 's': + sflag = 1; + break; + case '?': + 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)); + default: /* ln target1 target2 directory */ + sourcedir = argv[argc - 1]; + if (stat(sourcedir, &buf)) { + (void)fprintf(stderr, + "ln: %s: %s\n", sourcedir, strerror(errno)); + exit(1); + } + if (!S_ISDIR(buf.st_mode)) + usage(); + for (exitval = 0; *argv != sourcedir; ++argv) + exitval |= linkit(*argv, sourcedir, 1); + exit(exitval); + } + /* NOTREACHED */ +} + +static +linkit(target, source, isdir) + char *target, *source; + int isdir; +{ + struct stat buf; + char path[MAXPATHLEN], *cp; + + if (!sflag) { + /* if target doesn't exist, quit now */ + if (stat(target, &buf)) { + (void)fprintf(stderr, + "ln: %s: %s\n", target, strerror(errno)); + return(1); + } + /* only symbolic links to directories, unless -F option used */ + if (!dirflag && (buf.st_mode & S_IFMT) == S_IFDIR) { + (void)printf("ln: %s is a directory.\n", target); + return(1); + } + } + + /* if the source is a directory, append the target's name */ + if (isdir || !stat(source, &buf) && (buf.st_mode & S_IFMT) == S_IFDIR) { + if (!(cp = rindex(target, '/'))) + cp = target; + else + ++cp; + (void)sprintf(path, "%s/%s", source, cp); + source = path; + } + + if ((*linkf)(target, source)) { + (void)fprintf(stderr, "ln: %s: %s\n", source, strerror(errno)); + return(1); + } + return(0); +} + +static +usage() +{ + (void)fprintf(stderr, + "usage:\tln [-s] file1 file2\n\tln [-s] file ... directory\n"); + exit(1); +} |