root/user/bin/mv/mv.c

DEFINITIONS

1. dorename
2. main

   1 /*
   2  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
   3  *      The President and Fellows of Harvard College.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <unistd.h>
  31 #include <err.h>
  33 /*
  34  * mv - move (rename) files.
  35  * Usage: mv oldfile newfile
  36  *
  37  * Just calls rename() on them. If it fails, we don't attempt to
  38  * figure out which filename was wrong or what happened.
  39  *
  40  * In certain circumstances, Unix mv will fall back to copying and
  41  * deleting the old copy. We don't do that.
  42  *
  43  * We also don't allow the Unix form of
  44  *     mv file1 file2 file3 destination-dir
  45  */
  47 static
  48 void
dorename(const char *oldfile, const char *newfile)
  50 {
  51         if (rename(oldfile, newfile)) {
err(1, "%s or %s", oldfile, newfile);
  53         }
  54 }
  56 int
main(int argc, char *argv[])
  58 {
  59         if (argc!=3) {
errx(1, "Usage: mv oldfile newfile");
  61         }
dorename(argv[1], argv[2]);
  63         return 0;
  64 }