/* Copyright 1992 NEC Corporation, Tokyo, Japan.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of NEC
 * Corporation not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior
 * permission.  NEC Corporation makes no representations about the
 * suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * NEC CORPORATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN 
 * NO EVENT SHALL NEC CORPORATION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 
 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 
 * OTHER TORTUOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 
 * PERFORMANCE OF THIS SOFTWARE. 
 */

/*
 * forcpp.c	/lib/cpp を通す時に8ビットコードを保護する
 *	forcpp -7 < [in-file-name] > [out-file-name]
 *		-7	前処理
 *		-8	後処理
 */
#include	<stdio.h>
#include	<signal.h>
#include	<ctype.h>
#if defined(__STDC__) || defined(SVR4)
#include        <locale.h>
#endif
#include "ccompat.h"

#ifdef SVR4
extern char *gettxt();
#else
#define	gettxt(x,y)  (y)
#endif

char	*hd	= "0123456789abcdef";

/* #define	ESC	'@'*/
#define	ESC 033	
void e2j()
{
    unsigned	c;
    int		kin = 0;

    while ( (c = getchar()) != EOF ) {
	if ( c & 0x80 ) {
	    if ( !kin ) {
		putchar(ESC);
		kin = 1;
	    };
	    putchar(hd[c>>4]);
	    putchar(hd[c&15]);
	}
	else {
	    if ( kin ) {
		putchar(ESC);
		kin = 0;
	    };
	    putchar(c);
	};
    };
}

void j2e()
{
    unsigned	c;
    int		kin = 0;

    while ( (c = getchar()) != EOF ) {
	if ( c == ESC ) {
	    kin = 1 - kin;
	}
	else  {
	    if ( kin ) {
		char	s[3];

		s[0] = c;
		s[1] = getchar();
		s[2] = 0;
		sscanf(s, "%x", &c);
		

	    }
	    putchar(c);
	};
    };
}

void catch(sig)
int sig;
{
  fprintf(stderr, gettxt("cannacmd:18", "Dictionary format error.\n"));
  exit(1);
}

int main(n, args)
int	n;
char	*args[];
{

  (void)signal(SIGSEGV, catch);
#ifdef SIGBUS
  (void)signal(SIGBUS, catch);
#endif
#if defined(__STDC__) || defined(SVR4)
  (void)setlocale(LC_ALL,"");
#endif
#ifdef __EMX__
  _fsetmode(stdout, "b");
#endif

  if( n == 1 ) {		/* コマンド名だけの時 */
      fprintf(stderr, gettxt("cannacmd:19", "Usage: forcpp -7 < [file],\n       forcpp -8 < [file]\n"));
      exit( -1 );
  }

  if( !strcmp(args[1], "-7"))
      e2j();
  else if( !strcmp(args[1], "-8"))
      j2e();
  else
      fprintf(stderr, gettxt("cannacmd:20", "Usage: forcpp -7 < [file],\n       forcpp -8 < [file]\n"));

  exit(0);
}
