euc.multibyte.c

操作系统SunOS 4.1.3版本的源码

#if !defined(lint) && defined(SCCSIDS)
static  char *sccsid = "@(#)euc.multibyte.c 1.1 92/07/30 SMI";
#endif 

#include <sys/types.h>
#include "codeset.h"
#include "mbextern.h"
#include "euc.h"
#include <limits.h>

#define EUCMASK	0x8080		/* All id bits */
#define MASK0	0x0000		/* Code Set 0 */
#define MASK1	0x8080		/* Code Set 1 */
#define MASK2	0x0080		/* Code Set 2 */
#define MASK3	0x8000		/* Code Set 3 */

#define EUCWID1	eucinfo->_eucw1
#define EUCWID2	eucinfo->_eucw2
#define EUCWID3	eucinfo->_eucw3

int _mbtowc_euc(wchar, s, n)
wchar_t *wchar;
char *s;
size_t n;
{
	register int length;
	register wchar_t intcode;
	register c;
	char *olds = (char *)s;
	wchar_t mask;
        eucwidth_t * eucinfo = (eucwidth_t *)_code_set_info.code_info;
	
	if(n <= 0)
		return(-1);
	if(s == (char *)0)
		return 0;
	c = (unsigned char)*s++;
	if(c < 0200) {
		if(wchar)
			*wchar = c;
		return(c ? 1 : 0);
	}
	intcode = 0;
	if (c == SS2) {
		if(!(length = EUCWID2)) {
			if(wchar)
				*wchar = c;
			return(1);
		}
		mask = MASK2;
	} else if(c == SS3) {
		if(!(length = EUCWID3)) {
			if(wchar)
				*wchar = c;
			return(1);
		}
		mask = MASK3;
	} else {
		if(iscntrl(c)) {
			if(wchar)
				*wchar = c;
			return(1);
		}
		length = EUCWID1 - 1;
		mask = MASK1;
		intcode = c & 0177;
	}
	if(length + 1 > n)
		return(-1);
	while(length--) {
		if((c = (unsigned char)*s++) < 0200 || iscntrl(c))
			return(-1);
		intcode = (intcode << 8) | (c & 0177);
	}
	if(wchar)
		*wchar = intcode | mask;
	return((char *)s - olds);
}

	
size_t
_mbstowcs_euc(pwcs, s, n)
     wchar_t	*pwcs;
     char	*s;
     size_t	n;
{
	register int		i, j;

	j=0;
	while(*s) {
		if(j>=n) 
			break; 
		i=_mbtowc_euc(pwcs+j, s, MB_LEN_MAX);
		if(i==-1) 
			return -1;
		s+=i;
		++j;
	}
	if(j<n)
		pwcs[j]=0;
	return j;
}


size_t
_wcstombs_euc(s, pwcs, n)
     char	*s;
     wchar_t	*pwcs;
     size_t	n;
{
	register wchar_t	wc;
	register int		i;
	register int		r=n; /* Rest of bytes. */
	register char		*t;
	char			mbbuf[MB_LEN_MAX+1];

	while(wc=(*pwcs++)) {
		i=_wctomb_euc(mbbuf, wc);

		if (i>r) 
			break; 
		if (i==-1) return -1;

		r-=i;
		for (t=mbbuf;i>0;--i){
			/* Copy each byte. */
			*(s++)=*(t++);
		}
	}
	if (r>0)
		/* Has enough room for NUL. */
		*s=0;
	return n-r;
}

int _wctomb_euc(s, wchar)
char *s;
wchar_t wchar;
{
        eucwidth_t * eucinfo = (eucwidth_t *)_code_set_info.code_info;
	char *olds = s;
	register int size, index;
	unsigned char d;
	if(!s)
		return(0);
	if( wchar <= 0177 || wchar <= 0377 && iscntrl(wchar)) {
		*s++ = wchar;
		return(wchar ? 1 : 0);
	}
	switch(wchar & EUCMASK) {
		
		case MASK1:
			size = EUCWID1;
			break;
		
		case MASK2:
			*s++ = SS2;
			size = EUCWID2;
			break;
		
		case MASK3:
			*s++ = SS3;
			size = EUCWID3;
			break;
		
		default:
			return(-1);
	}
	index = size;	
	while(index--) {
		d = wchar | 0200;
		wchar >>= 8;
		if(iscntrl(d))
			return(-1);
		s[index] = d;
	}
return(s + size - olds);
}