386BSD 0.1 development

Work on file usr/src/bin/ln/ln.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/src/bin/ln/ln.c b/usr/src/bin/ln/ln.c
new file mode 100644 (file)
index 0000000..c421fe0
--- /dev/null
+++ b/usr/src/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);
+}