char *strchr (const char *, int);
void abort ();
#define isblank(c)     ((c) == ' ' || (c) == '\t')

/* Return the address of the first nonwhitespace or null in the string S.  */

char *
next_token (s)
     char *s;
{
  register char *p = s;

  while (isblank ((unsigned char)*p))
    ++p;
  return p;
}

void
collapse_continuations (line)
     char *line;
{
  register char *in, *out, *p;
  register int backslash;
  register unsigned int bs_write;

  in = strchr (line, '\n');
  if (in == 0)
    return;

  out = in;
  while (out > line && out[-1] == '\\')
    --out;

  while (*in != '\0')
    {
      /* BS_WRITE gets the number of quoted backslashes at
	 the end just before IN, and BACKSLASH gets nonzero
	 if the next character is quoted.  */
      backslash = 0;
      bs_write = 0;
      for (p = in - 1; p >= line && *p == '\\'; --p)
	{
	  if (backslash)
	    ++bs_write;
	  backslash = !backslash;

	  /* It should be impossible to go back this far without exiting,
	     but if we do, we can't get the right answer.  */
	  if (in == out - 1)
	    abort ();
	}

      /* Output the appropriate number of backslashes.  */
      while (bs_write-- > 0)
	*out++ = '\\';

      /* Skip the newline.  */
      ++in;

      /* If the newline is quoted, discard following whitespace
	 and any preceding whitespace; leave just one space.  */
      if (backslash)
	{
	  in = next_token (in);
	  while (out > line && isblank ((unsigned char)out[-1]))
	    --out;
	  *out++ = ' ';
	}
      else
	/* If the newline isn't quoted, put it in the output.  */
	*out++ = '\n';

      /* Now copy the following line to the output.
	 Stop when we find backslashes followed by a newline.  */
      while (*in != '\0')
	if (*in == '\\')
	  {
	    p = in + 1;
	    while (*p == '\\')
	      ++p;
	    if (*p == '\n')
	      {
		in = p;
		break;
	      }
	    while (in < p)
	      *out++ = *in++;
	  }
	else
	  *out++ = *in++;
    }

  *out = '\0';
}

int main ()
{
  char line[] = "VER = `\tif grep AM_INIT_AUTOMAKE $(TOOL)/configure.in >/dev/null 2>&1; then \\\n\t  sed < $(TOOL)/configure.in -n 's/AM_INIT_AUTOMAKE[^,]*, *\\([^)]*\\))/\\1/p'; \\\n\telse \\\n\t  sed < $(TOOL)/Makefile.in -n 's/^VERSION *= *//p'; \\\n\tfi`";

  collapse_continuations (line);
  return 0;
}