cpnt.c

来自「The Offline NT Password Editor (c) 1997」· C语言 代码 · 共 104 行

/*
 * cpnt.c - Copy over file without truncating.
 *          For use on my current floppy, since it's 'cp' insist
 *          on truncating first, and NTFS doesn't like that yet.
 *
 * 2003-apr: First version
 *
 *
 * Copyright (c) 1997-2003 Petter Nordahl-Hagen.
 * Freely distributable in source or binary for noncommercial purposes,
 * but I allow some exceptions to this.
 * Please see the COPYING file for more details on
 * copyrights & credits.
 *  
 * THIS SOFTWARE IS PROVIDED BY PETTER NORDAHL-HAGEN `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 AUTHOR 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.
 *
 */ 

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>


#define BUFSIZE 16384

int main(int argc, char **argv)
{

  void *buf;
  int sf,df,rb,wb;
  int going = 1;
  int e = 0;

  if (argc != 3) {
    printf("usage: cpnt <sourcefile> <destfile>\n");
    printf("       sorry, only one file at a time yet.\n");
    return(1);
  }

#if 0
  printf("input : %s\n",argv[1]);
  printf("output: %s\n",argv[2]);
#endif

  buf = malloc(BUFSIZE);
  if (!buf) {
    printf("cpnt: could not allocate buffer\n");
    return(1);
  }

  sf = open(argv[1],O_RDONLY);
  if (sf < 0) {
    e = errno;
    printf("cpnt: %s: %s\n",argv[1],strerror(e));
    return(1);
  }

  df = open(argv[2],O_WRONLY|O_CREAT,00666);
  if (df < 0) {
    e = errno;
    printf("cpnt: %s: %s\n",argv[2],strerror(e));
    return(1);
  }

  while (going) {
    rb = read(sf,buf,BUFSIZE);
    if (rb < 0) {
      e = errno;
      printf("cpnt: error while reading: %s\n",strerror(e));
      going = 0;
      break;
    }
    if (rb == 0) going = 0;
    wb = write(df,buf,rb);
    if (wb < 0) {
      e = errno;
      printf("cpnt: error while writing: %s\n",strerror(e));
      going = 0;
    }
    
  }

  close(sf);
  close(df);
  free(buf);

  return(e ? 1 : 0);
}