wraith-ircbot/src/misc_file.c

/*
 * misc.c -- handles:
 *   copyfile() movefile()
 *
 */

#include "main.h"
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "stat.h"


/* Copy a file from one place to another (possibly erasing old copy).
 *
 * returns:  0 if OK
 *	     1 if can't open original file
 *	     2 if can't open new file
 *	     3 if original file isn't normal
 *	     4 if ran out of disk space
 */
int copyfile(char *oldpath, char *newpath)
{
  int fi, fo, x;
  char buf[512];
  struct stat st;

#ifndef CYGWIN_HACKS
  fi = open(oldpath, O_RDONLY, 0);
#else
  fi = open(oldpath, O_RDONLY | O_BINARY, 0);
#endif
  if (fi < 0)
    return 1;
  fstat(fi, &st);
  if (!(st.st_mode & S_IFREG))
    return 3;
  fo = creat(newpath, (int) (st.st_mode & 0600));
  if (fo < 0) {
    close(fi);
    return 2;
  }
  for (x = 1; x > 0;) {
    x = read(fi, buf, 512);
    if (x > 0) {
      if (write(fo, buf, x) < x) {	/* Couldn't write */
	close(fo);
	close(fi);
	unlink(newpath);
	return 4;
      }
    }
  }
#ifdef HAVE_FSYNC
  fsync(fo);
#endif /* HAVE_FSYNC */
  close(fo);
  close(fi);
  return 0;
}

int movefile(char *oldpath, char *newpath)
{
  int ret;

#ifdef HAVE_RENAME
  /* Try to use rename first */
  if (!rename(oldpath, newpath))
    return 0;
#endif /* HAVE_RENAME */

  /* If that fails, fall back to just copying and then
   * deleting the file.
   */
  ret = copyfile(oldpath, newpath);
  if (!ret)
    unlink(oldpath);
  return ret;
}