/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2012 AT&T Intellectual Property          *
*          Copyright (c) 2020-2024 Contributors to ksh 93u+m           *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 2.0                  *
*                                                                      *
*                A copy of the License is available at                 *
*      https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html      *
*         (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d)         *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                  Martijn Dekker <martijn@inlv.org>                   *
*            Johnothan King <johnothanking@protonmail.com>             *
*                                                                      *
***********************************************************************/

/*
 * setlocale() intercept
 * maintains a bitmask of non-default categories
 * and a permanent locale namespace for pointer comparison
 * and persistent private data for locale related functions
 */

#include <ast_standards.h>

#include "lclib.h"

#include <ast_wchar.h>
#include <ctype.h>
#include <mc.h>
#include <namval.h>
#include <error.h>

#if ( _lib_wcwidth || _lib_wctomb ) && _hdr_wctype
#include <wctype.h>
#endif

#if _lib_wcwidth
#undef	wcwidth
#else
#define wcwidth			0
#endif

#if _lib_wctomb
#undef	wctomb
#else
#define wctomb			0
#endif

#ifdef mblen
#undef	mblen
extern int		mblen(const char*, size_t);
#endif

#undef	mbtowc
#undef	setlocale
#undef	strcmp
#undef	strcoll
#undef	strxfrm
#undef	valid

#ifndef AST_LC_CANONICAL
#define AST_LC_CANONICAL	LC_abbreviated
#endif

static void
header(void)
{
	static int	done = 0;

	if (!done)
	{
		done = 1;
		sfprintf(sfstderr, "locale      %17s %16s %16s %16s %s\n", "CATEGORY", "AST", "SYSTEM", "PREVIOUS", "ATTRIBUTES");
	}
}

/*
 * LC_COLLATE and LC_CTYPE native support
 */

#if !_lib_mbtowc || MB_LEN_MAX <= 1
#define mblen		0
#define mbtowc		0
#endif

#if !_lib_strcoll
#define	strcoll		0
#endif

#if !_lib_strxfrm
#define	strxfrm		0
#endif

/*
 * LC_COLLATE and LC_CTYPE debug support
 *
 * multibyte debug encoding
 *
 *	DL0 [ '0' .. '4' ] c1 ... c4 DR0
 *	DL1 [ '0' .. '4' ] c1 ... c4 DR1
 *
 * with these ligatures
 *
 *	ch CH sst SST
 *
 * and private collation order
 *
 * wide character display width is the low order 3 bits
 * wctomb() uses DL1...DR1
 */

#define DEBUG_MB_CUR_MAX	7

#if DEBUG_MB_CUR_MAX < MB_LEN_MAX
#undef	DEBUG_MB_CUR_MAX
#define DEBUG_MB_CUR_MAX	MB_LEN_MAX
#endif

#define DL0	'<'
#define DL1	0xab		/* 8-bit mini << on xterm	*/
#define DR0	'>'
#define DR1	0xbb		/* 8-bit mini >> on xterm	*/

#define DB	((int)sizeof(wchar_t)*8-1)
#define DC	7		/* wchar_t embedded char bits	*/
#define DX	(DB/DC)		/* wchar_t max embedded chars	*/
#define DZ	(DB-DX*DC+1)	/* wchar_t embedded size bits	*/
#define DD	3		/* # mb delimiter chars <n...>	*/

#if !AST_NOMULTIBYTE

static unsigned char debug_order[] =
{
	  0,   1,   2,   3,   4,   5,   6,   7,
	  8,   9,  10,  11,  12,  13,  14,  15,
	 16,  17,  18,  19,  20,  21,  22,  23,
	 24,  25,  26,  27,  28,  29,  30,  31,
	 99, 100, 101, 102,  98, 103, 104, 105,
	106, 107, 108,  43, 109,  44,  42, 110,
	 32,  33,  34,  35,  36,  37,  38,  39,
	 40,  41, 111, 112, 113, 114, 115, 116,
	117,  71,  72,  73,  74,  75,  76,  77,
	 78,  79,  80,  81,  82,  83,  84,  85,
	 86,  87,  88,  89,  90,  91,  92,  93,
	 94,  95,  96, 118, 119, 120, 121,  97,
	122,  45,  46,  47,  48,  49,  50,  51,
	 52,  53,  54,  55,  56,  57,  58,  59,
	 60,  61,  62,  63,  64,  65,  66,  67,
	 68,  69,  70, 123, 124, 125, 126, 127,
	128, 129, 130, 131, 132, 133, 134, 135,
	136, 137, 138, 139, 140, 141, 142, 143,
	144, 145, 146, 147, 148, 149, 150, 151,
	152, 153, 154, 155, 156, 157, 158, 159,
	160, 161, 162, 163, 164, 165, 166, 167,
	168, 169, 170, 171, 172, 173, 174, 175,
	176, 177, 178, 179, 180, 181, 182, 183,
	184, 185, 186, 187, 188, 189, 190, 191,
	192, 193, 194, 195, 196, 197, 198, 199,
	200, 201, 202, 203, 204, 205, 206, 207,
	208, 209, 210, 211, 212, 213, 214, 215,
	216, 217, 218, 219, 220, 221, 222, 223,
	224, 225, 226, 227, 228, 229, 230, 231,
	232, 233, 234, 235, 236, 237, 238, 239,
	240, 241, 242, 243, 244, 245, 246, 247,
	248, 249, 250, 251, 252, 253, 254, 255,
};

static int
debug_mbtowc(wchar_t* p, const char* s, size_t n)
{
	const char*	q;
	const char*	r;
	int		w;
	int		dr;
	wchar_t		c;

	if (n < 1)
		return -1;
	if (!s || !*s)
		return 0;
	switch (((unsigned char*)s)[0])
	{
	case DL0:
		dr = DR0;
		break;
	case DL1:
		dr = DR1;
		break;
	default:
	single:
		if (p)
			*p = ((unsigned char*)s)[0] & ((1<<DC)-1);
		return 1;
	}
	if (n < 2)
		return -1;
	if ((w = ((unsigned char*)s)[1]) < '0' || w > ('0' + DX))
		goto single;
	if ((w -= '0' - DD) > n)
		return -1;
	r = s + w - 1;
	q = s += 2;
	while (q < r && *q)
		q++;
	if (q != r || *((unsigned char*)q) != dr)
		return -1;
	if (p)
	{
		c = 1;
		while (--q >= s)
		{
			c <<= DC;
			c |= *((unsigned char*)q);
		}
		c <<= DZ;
		c |= (w - DD);
		*p = c;
	}
	return w;
}

static int
debug_wctomb(char* s, wchar_t c)
{
	int	w;
	int	i;
	int	k;

	w = 0;
	if (c >= 0 && c <= UCHAR_MAX)
	{
		w++;
		if (s)
			*s = c;
	}
	else if ((i = c & ((1<<DZ)-1)) > DX)
		return -1;
	else
	{
		w++;
		if (s)
			*s++ = DL0;
		c >>= DZ;
		w++;
		if (s)
			*s++ = i + '0';
		while (i--)
		{
			w++;
			if (s)
				*s++ = (k = c & ((1<<DC)-1)) ? k : '?';
			c >>= DC;
		}
		w++;
		if (s)
			*s++ = DR0;
	}
	return w;
}

static int
debug_mblen(const char* s, size_t n)
{
	return debug_mbtowc(NULL, s, n);
}

static int
debug_wcwidth(wchar_t c)
{
	if (c >= 0 && c <= UCHAR_MAX)
		return 1;
	if ((c &= ((1<<DZ)-1)) > DX)
		return -1;
	return c + DD;
}

static int
debug_alpha(wchar_t c)
{
	return isalpha((c >> DZ) & ((1<<DC)-1));
}

static size_t
debug_strxfrm(char* t, const char* s, size_t n)
{
	const char*	q;
	const char*	r;
	char*		e;
	char*		o;
	size_t		z;
	int		w;

	o = t;
	z = 0;
	if (e = t)
		e += n;
	while (s[0])
	{
		if ((((unsigned char*)s)[0] == DL0 || ((unsigned char*)s)[0] == DL1) && (w = s[1]) >= '0' && w <= ('0' + DC))
		{
			w -= '0';
			q = s + 2;
			r = q + w;
			while (q < r && *q)
				q++;
			if (*((unsigned char*)q) == DR0 || *((unsigned char*)q) == DR1)
			{
				if (t)
				{
					for (q = s + 2; q < r; q++)
						if (t < e)
							*t++ = debug_order[*((unsigned char*)q)];
					while (w++ < DX)
						if (t < e)
							*t++ = 1;
				}
				s = r + 1;
				z += DX;
				continue;
			}
		}
		if ((s[0] == 'c' || s[0] == 'C') && (s[1] == 'h' || s[1] == 'H'))
		{
			if (t)
			{
				if (t < e)
					*t++ = debug_order[((unsigned char*)s)[0]];
				if (t < e)
					*t++ = debug_order[((unsigned char*)s)[1]];
				if (t < e)
					*t++ = 1;
				if (t < e)
					*t++ = 1;
			}
			s += 2;
			z += DX;
			continue;
		}
		if ((s[0] == 's' || s[0] == 'S') && (s[1] == 's' || s[1] == 'S') && (s[2] == 't' || s[2] == 'T'))
		{
			if (t)
			{
				if (t < e)
					*t++ = debug_order[((unsigned char*)s)[0]];
				if (t < e)
					*t++ = debug_order[((unsigned char*)s)[1]];
				if (t < e)
					*t++ = debug_order[((unsigned char*)s)[2]];
				if (t < e)
					*t++ = 1;
			}
			s += 3;
			z += DX;
			continue;
		}
		if (t)
		{
			if (t < e)
				*t++ = debug_order[((unsigned char*)s)[0]];
			if (t < e)
				*t++ = 1;
			if (t < e)
				*t++ = 1;
			if (t < e)
				*t++ = 1;
		}
		s++;
		z += DX;
	}
	if (!t)
		return z;
	if (t < e)
		*t = 0;
	return t - o;
}

static int
debug_strcoll(const char* a, const char* b)
{
	char	ab[1024];
	char	bb[1024];

	debug_strxfrm(ab, a, sizeof(ab) - 1);
	ab[sizeof(ab)-1] = 0;
	debug_strxfrm(bb, b, sizeof(bb) - 1);
	bb[sizeof(bb)-1] = 0;
	return strcmp(ab, bb);
}

#else

#define debug_mbtowc	0
#define debug_wctomb	0
#define debug_mblen	0
#define	debug_wcwidth	0
#define debug_alpha	0
#define debug_strxfrm	0
#define debug_strcoll	0

#endif	/* !AST_NOMULTIBYTE */

/*
 * default locale
 */

static int
default_wcwidth(wchar_t w)
{
	return w >= 0 && w <= 255 && !iscntrl(w) ? 1 : -1;
}

/*
 * called when LC_COLLATE initialized or changes
 */

static int
set_collate(Lc_category_t* cp)
{
	if (locales[cp->internal]->flags & LC_debug)
	{
		ast.collate = debug_strcoll;
		ast.mb_xfrm = debug_strxfrm;
	}
	else if (locales[cp->internal]->flags & LC_default)
	{
		ast.collate = strcmp;
		ast.mb_xfrm = 0;
	}
	else
	{
		ast.collate = strcoll;
		ast.mb_xfrm = strxfrm;
	}
	return 0;
}

/*
 * workaround the interesting SJIS that translates unshifted 7 bit ASCII!
 */

#if _hdr_wchar && _typ_mbstate_t && _lib_mbrtowc && !AST_NOMULTIBYTE

#define mb_state_zero	((mbstate_t*)&ast.pad[sizeof(ast.pad)-2*sizeof(mbstate_t)])
#define mb_state	((mbstate_t*)&ast.pad[sizeof(ast.pad)-sizeof(mbstate_t)])

static int
sjis_mbtowc(wchar_t* p, const char* s, size_t n)
{
	if (n && p && s && (*s == '\\' || *s == '~') && !memcmp(mb_state, mb_state_zero, sizeof(mbstate_t)))
	{
		*p = *s;
		return 1;
	}
	return mbrtowc(p, s, n, mb_state);
}

#endif

#if !AST_NOMULTIBYTE

static int
utf8_wctomb(char* u, wchar_t w) 
{
	return u ? wc2utf8(u, w) : 0;
}

static const uint32_t		utf8mask[] =
{
	0x00000000,
	0x00000000,
	0xffffff80,
	0xfffff800,
	0xffff0000,
	0xffe00000,
	0xfc000000,
};

static const signed char	utf8tab[256] =
{
	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
	4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6,-1,-1,
};

static int
utf8_mbtowc(wchar_t* wp, const char* str, size_t n)
{
	unsigned char*	sp = (unsigned char*)str;
	int		m;
	int		i;
	int		c;
	wchar_t		w = 0;

	if (!sp || !n)
		return 0;
	if ((m = utf8tab[*sp]) > 0)
	{
		if (m > n)
			return -1;
		if (wp)
		{
			if (m == 1)
			{
				*wp = *sp;
				return 1;
			}
			w = *sp & ((1<<(8-m))-1);
			for (i = m - 1; i > 0; i--)
			{
				c = *++sp;
				if ((c&0xc0) != 0x80)
					goto invalid;
				w = (w<<6) | (c&0x3f);
			}
			if (!(utf8mask[m] & w) || w >= 0xd800 && (w <= 0xdfff || w >= 0xfffe && w <= 0xffff))
				goto invalid;
			*wp = w;
		}
		return m;
	}
	if (!*sp)
		return 0;
 invalid:
	errno = EILSEQ;
	ast.mb_sync = (const char*)sp - str;
	return -1;
}

static int
utf8_mblen(const char* str, size_t n)
{
	wchar_t		w;

	return utf8_mbtowc(&w, str, n);
}

static const unsigned char	utf8_wcw[] =
{
 0xfc,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xd5,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x5d,0x55,0x55,0x55,0x55,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xf5,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xd5,0xff,0xff,0xff,0xff,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00,0xff,0xf5,0xdf,0xdf,
 0xff,0x55,0xd5,0x5d,0x55,0x55,0x55,0x55,0x75,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0xd5,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xd5,0xff,0xff,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x15,0xc0,0x50,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0xd5,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xf5,0xf5,0xff,
 0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x57,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0xd5,0x57,0x55,0x57,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0xd7,0xff,0x03,0x00,0x00,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x30,0x10,
 0x41,0xfc,0xff,0xff,0x55,0x55,0x55,0x55,0x55,0x55,0xd5,0xff,0x55,0xfd,0xff,0xff,
 0xff,0xff,0xff,0xfd,0xff,0xff,0x7f,0x7f,0x57,0x55,0x55,0x55,0x55,0x55,0xd5,0xff,
 0x55,0x55,0x15,0x00,0x00,0xf0,0xff,0xff,0x55,0x55,0x55,0x55,0x54,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x05,0x00,0x00,0x00,0x14,0x04,0xf0,0x55,0x55,0x55,0xd5,
 0x55,0x55,0x55,0x35,0x51,0x55,0x55,0x55,0x55,0x55,0x55,0xfd,0x00,0x00,0x00,0x00,
 0x00,0x00,0xc0,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x05,0x00,0x00,0xf4,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0x43,0x57,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xf5,0x54,
 0x01,0x00,0x54,0xf1,0x01,0xfc,0x55,0x55,0x05,0x55,0x55,0x55,0xfd,0xff,0xff,0xff,
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 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0x55,0xd5,0xff,0xff,0x7f,0x55,0xff,0x47,0x55,0x55,0x55,0x55,0x55,0xd5,0x55,0xdd,
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 0xff,0xff,0xff,0xff,0x7f,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
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 0xff,0xff,0xff,0xff,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x5f,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x55,0x55,0x55,0xfd,
 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xaa,0xaa,0xaa,0xaa,
 0xaa,0xea,0xab,0xaa,0xea,0xaa,0xaa,0xaa,0xaa,0xea,0xaa,0xff,0x55,0x5d,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x3d,
 0xab,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,
 0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0x56,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
 0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,0xd5,
 0x5f,0x55,0x5f,0x55,0x5f,0x55,0x5f,0xfd,0xaa,0xea,0x55,0xd5,0xff,0xff,0x03,0xf5
};

static int
utf8_wcwidth(wchar_t c)
{
	int	n;

	return (n = (utf8_wcw[(c >> 2) & 0x3fff] >> ((c & 0x3) << 1)) & 0x3) == 3 ? -1 : n;
}

static const unsigned char	utf8_wam[] =
{
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xfe,0xff,0xff,0x07,0xfe,0xff,0xff,0x07,
 0x00,0x00,0x00,0x00,0x00,0x04,0x20,0x04,0xff,0xff,0x7f,0xff,0xff,0xff,0x7f,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xfd,0xff,0x0f,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0x3f,0xff,0xf9,0x03,0x00,0x03,0x00,0x1f,0x40,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x04,
 0x40,0xd7,0xff,0xff,0xfb,0xff,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0x3f,0x00,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0x03,0xfc,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,0xff,0xff,0xff,0xff,0x3f,0x03,
 0xff,0xff,0x00,0x00,0x00,0x00,0xfe,0xff,0xff,0xff,0x7f,0x02,0xfe,0xff,0xff,0xff,
 0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xff,0x07,0x07,0x00,
 0x00,0x00,0x00,0x00,0xfe,0xff,0xff,0x07,0xff,0x07,0x00,0x00,0xff,0xc3,0xfe,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x2f,0x00,0x60,0x00,0xff,0x1f,
 0x00,0x00,0xfd,0xff,0xff,0x1f,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0xff,0xff,0xff,0xff,0x3f,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0x3f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x07,0x00,0x00,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
 0x7f,0x00,0xf8,0xa0,0xff,0xfd,0x7f,0x5f,0xdb,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0x03,0x00,0x00,0x00,0xf8,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x3f,0x00,0x00,0xff,0xff,0xff,0xff,0xff,0xff,
 0xff,0xff,0xfc,0xff,0xff,0xff,0xff,0xff,0xff,0x00,0x00,0x00,0x00,0x00,0xff,0x0f,
 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xdf,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x1f,
 0x00,0x00,0xff,0x03,0xfe,0xff,0xff,0x07,0xfe,0xff,0xff,0x07,0xc0,0xff,0xff,0xff,
 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,0xfc,0xfc,0xfc,0x1c,0x00,0x00,0x00,0x00
};

static int
utf8_alpha(wchar_t c)
{
	return !!(utf8_wam[(c >> 3) & 0x1fff] & (1 << (c & 0x7)));
}

#else

#define utf8_wctomb	0
#define utf8_mbtowc	0
#define utf8_mblen	0
#define utf8_wcwidth	0
#define utf8_alpha	0

#endif /* !AST_NOMULTIBYTE */

#if !_hdr_wchar || !_lib_wctype || !_lib_iswctype
#undef	iswalpha
#define iswalpha	default_iswalpha
static int
iswalpha(wchar_t c)
{
	return c <= 0x7f ? isalpha(c) : 0;
}
#endif

typedef int (*Isw_f)(wchar_t);

static int
wide_wctomb(char* u, wchar_t w)
{
	int size = 0;

	if (u)
	{
		size = wctomb(u, w);
		if (size < 0)
		{
			*u = (char)(w & 0xff);
			size = 1;
		}
	}
	return size;
}

/*
 * called when LC_CTYPE initialized or changes
 */

static int
set_ctype(Lc_category_t* cp)
{
	ast.mb_sync = 0;
	ast.mb_alpha = (Isw_f)iswalpha;
#if AHA
	if ((ast.locale.set & (AST_LC_debug|AST_LC_setlocale)) && !(ast.locale.set & AST_LC_internal))
		sfprintf(sfstderr, "locale setf %17s %16s\n", cp->name, locales[cp->internal]->name);
#endif
	if (locales[cp->internal]->flags & LC_debug)
	{
		ast.mb_cur_max = DEBUG_MB_CUR_MAX;
		ast.mb_len = debug_mblen;
		ast.mb_towc = debug_mbtowc;
		ast.mb_width = debug_wcwidth;
		ast.mb_conv = debug_wctomb;
		ast.mb_alpha = debug_alpha;
	}
	else if ((locales[cp->internal]->flags & LC_utf8) && !(ast.locale.set & AST_LC_test))
	{
		ast.mb_cur_max = 6;
		ast.mb_len = utf8_mblen;
		ast.mb_towc = utf8_mbtowc;
		if ((locales[cp->internal]->flags & LC_local) || !(ast.mb_width = wcwidth))
			ast.mb_width = utf8_wcwidth;
		ast.mb_conv = utf8_wctomb;
		ast.mb_alpha = utf8_alpha;
	}
	else if ((locales[cp->internal]->flags & LC_default) || (ast.mb_cur_max = MB_CUR_MAX) <= 1 || !(ast.mb_len = mblen) || !(ast.mb_towc = mbtowc))
	{
		ast.mb_cur_max = 1;
		ast.mb_len = 0;
		ast.mb_towc = 0;
		ast.mb_width = default_wcwidth;
		ast.mb_conv = 0;
	}
	else
	{
		if (!(ast.mb_width = wcwidth))
			ast.mb_width = default_wcwidth;
		ast.mb_conv = wide_wctomb;
#ifdef mb_state
		{
			/*
			 * check for SJIS that translates unshifted 7 bit ASCII!
			 */

			char*	s;
			char	buf[2];

			mbinit();
			buf[1] = 0;
			*(s = buf) = '\\';
			if (mbchar(s) != buf[0])
			{
				memcpy(mb_state, mb_state_zero, sizeof(mbstate_t));
				ast.mb_towc = sjis_mbtowc;
			}
		}
#endif
	}
	return 0;
}

/*
 * called when LC_NUMERIC initialized or changes
 */

static int
set_numeric(Lc_category_t* cp)
{
	int		category = cp->internal;
	struct lconv*	lp;
	Lc_numeric_t*	dp;

	static Lc_numeric_t	default_numeric = { '.', -1 };
	static Lc_numeric_t	eu_numeric = { ',', '.' };
	static Lc_numeric_t	us_numeric = { '.', ',' };

#if AHA
	if ((ast.locale.set & (AST_LC_debug|AST_LC_setlocale)) && !(ast.locale.set & AST_LC_internal))
		sfprintf(sfstderr, "locale setf %17s %16s\n", cp->name, locales[cp->internal]->name);
#endif
	if (!LCINFO(category)->data)
	{
		if (locales[cp->internal]->flags & LC_local)
			dp = locales[cp->internal]->territory == &lc_territories[0] ? &default_numeric : *locales[cp->internal]->territory->code == 'e' ? &eu_numeric : &us_numeric;
		else if ((lp = localeconv()) && (dp = newof(0, Lc_numeric_t, 1, 0)))
		{
			dp->decimal = lp->decimal_point && *lp->decimal_point ? *(unsigned char*)lp->decimal_point : '.';
			dp->thousand = lp->thousands_sep && *lp->thousands_sep ? *(unsigned char*)lp->thousands_sep : -1;
		}
		else
			dp = &default_numeric;
		LCINFO(category)->data = dp;
	}
	return 0;
}

/*
 * The order of this table must correspond to the numbers of the #defines in ast_std.h
 */

Lc_category_t		lc_categories[] =
{
{ "LC_ALL",           LC_ALL,           AST_LC_ALL,           0               },
{ "LC_COLLATE",       LC_COLLATE,       AST_LC_COLLATE,       set_collate     },
{ "LC_CTYPE",         LC_CTYPE,         AST_LC_CTYPE,         set_ctype       },
{ "LC_MESSAGES",      LC_MESSAGES,      AST_LC_MESSAGES,      0               },
{ "LC_MONETARY",      LC_MONETARY,      AST_LC_MONETARY,      0               },
{ "LC_NUMERIC",       LC_NUMERIC,       AST_LC_NUMERIC,       set_numeric     },
{ "LC_TIME",          LC_TIME,          AST_LC_TIME,          0               },
{ "LC_IDENTIFICATION",LC_IDENTIFICATION,AST_LC_IDENTIFICATION,0               },
{ "LC_ADDRESS",       LC_ADDRESS,       AST_LC_ADDRESS,       0               },
{ "LC_NAME",          LC_NAME,          AST_LC_NAME,          0               },
{ "LC_TELEPHONE",     LC_TELEPHONE,     AST_LC_TELEPHONE,     0               },
{ "LC_MEASUREMENT",   LC_MEASUREMENT,   AST_LC_MEASUREMENT,   0               },
{ "LC_PAPER",         LC_PAPER,         AST_LC_PAPER,         0               },
};

static Lc_t*		lang;
static Lc_t*		lc_all;

typedef struct Unamval_s
{
	char*		name;
	unsigned int	value;
} Unamval_t;

static const Unamval_t	options[] =
{
	"debug",		AST_LC_debug,
	"find",			AST_LC_find,
	"setlocale",		AST_LC_setlocale,
	"test",			AST_LC_test,
	"translate",		AST_LC_translate,
	0,			0
};

/*
 * called by stropt() to set options
 */

static int
setopt(void* a, const void* p, int n, const char* v)
{
	if (p)
	{
		if (n)
			ast.locale.set |= ((Unamval_t*)p)->value;
		else
			ast.locale.set &= ~((Unamval_t*)p)->value;
	}
	return 0;
}

#if !_lib_setlocale

#define setlocale(c,l)		default_setlocale(c,l)

static char*
default_setlocale(int category, const char* locale)
{
	Lc_t*		lc;

	if (locale)
	{
		if (!(lc = lcmake(locale)) || !(lc->flags & LC_default))
			return NULL;
		locales[0]->flags &= ~lc->flags;
		locales[1]->flags &= ~lc->flags;
		return lc->name;
	}
	return (locales[1]->flags & (1<<category)) ? locales[1]->name : locales[0]->name;
}

#endif

/* <TODO> [2022-07-21]: remove this and _vmkeep? obsolete? */
/*
 * workaround for Solaris and FreeBSD systems
 * they call free() with addresses that look like they came from the stack
 */

extern int	_vmkeep(int);

static char*
_sys_setlocale(int category, const char* locale)
{
	char*	r;
	int	k;

	k = _vmkeep(1);
	r = setlocale(category, locale);
	(void)_vmkeep(k);
	return r;
}

#define setlocale(a,b)	_sys_setlocale(a,b)
/* </TODO> */

/*
 * set a single AST_LC_* locale category
 * the caller must validate category
 * lc==0 restores the previous state
 */

static char*
single(int category, Lc_t* lc, unsigned int flags)
{
	const char*	sys;
	int		i;

#if AHA
	if ((ast.locale.set & (AST_LC_debug|AST_LC_setlocale)) && !(ast.locale.set & AST_LC_internal))
		sfprintf(sfstderr, "locale single %16s %16s flags %04x\n", lc_categories[category].name, lc ? lc->name : 0, flags);
#endif
	if (flags & (LC_setenv|LC_setlocale))
	{
		if (!(ast.locale.set & AST_LC_internal))
			lc_categories[category].prev = lc;
		if ((flags & LC_setenv) && lc_all && locales[category])
		{
			if (lc_categories[category].setf)
				(*lc_categories[category].setf)(&lc_categories[category]);
			return (char*)locales[category]->name;
		}
	}
	if (!lc && (!(lc_categories[category].flags & LC_setlocale) || !(lc = lc_categories[category].prev)) && !(lc = lc_all) && !(lc = lc_categories[category].prev) && !(lc = lang))
		lc = lcmake(NULL);
	sys = 0;
	if (locales[category] != lc)
	{
		if (lc_categories[category].external == -lc_categories[category].internal)
		{
			for (i = 1; i < AST_LC_COUNT; i++)
				if (locales[i] == lc)
				{
					sys = (char*)lc->name;
					break;
				}
		}
		else if (lc->flags & (LC_debug|LC_local))
			sys = setlocale(lc_categories[category].external, lcmake(NULL)->name);
		else if (!(sys = setlocale(lc_categories[category].external, lc->name)) &&
			 (streq(lc->name, lc->code) || !(sys = setlocale(lc_categories[category].external, lc->code))) &&
			 !streq(lc->code, lc->language->code))
				sys = setlocale(lc_categories[category].external, lc->language->code);
		if (sys)
			lc->flags |= LC_checked;
		else
		{
			/*
			 * check for local override
			 * currently this means an LC_MESSAGES dir exists
			 */

			if (!(lc->flags & LC_checked))
			{
				char	path[PATH_MAX];

				if (mcfind(lc->code, NULL, LC_MESSAGES, 0, path, sizeof(path)))
					lc->flags |= LC_local;
				lc->flags |= LC_checked;
			}
			if (!(lc->flags & LC_local))
				return NULL;
			if (lc_categories[category].external != -lc_categories[category].internal)
				setlocale(lc_categories[category].external, lcmake(NULL)->name);
		}
		locales[category] = lc;
		if (lc_categories[category].setf && (*lc_categories[category].setf)(&lc_categories[category]))
		{
			locales[category] = lc_categories[category].prev;
			return NULL;
		}
		if ((lc->flags & LC_default) || category == AST_LC_MESSAGES && lc->name[0] == 'e' && lc->name[1] == 'n' && (lc->name[2] == 0 || lc->name[2] == '_' && lc->name[3] == 'U'))
			ast.locale.set &= ~(1<<category);
		else
			ast.locale.set |= (1<<category);
	}
	else if (lc_categories[category].flags ^ flags)
	{
		lc_categories[category].flags &= ~(LC_setenv|LC_setlocale);
		lc_categories[category].flags |= flags;
	}
	else
	{
		if (lc_categories[category].setf)
			(*lc_categories[category].setf)(&lc_categories[category]);
		return (char*)lc->name;
	}
	if ((ast.locale.set & (AST_LC_debug|AST_LC_setlocale)) && !(ast.locale.set & AST_LC_internal))
	{
		header();
		sfprintf(sfstderr, "locale set  %17s %16s %16s %16s", lc_categories[category].name, lc->name, sys, lc_categories[category].prev ? lc_categories[category].prev->name : NULL);
		if (category == AST_LC_CTYPE)
			sfprintf(sfstderr, " MB_CUR_MAX=%d%s%s%s%s%s"
				, ast.mb_cur_max
				, ast.mb_len == debug_mblen ? " debug_mblen" : ast.mb_len == utf8_mblen ? " utf8_mblen" : ast.mb_len == mblen ? " mblen" : ""
				, ast.mb_towc == debug_mbtowc ? " debug_mbtowc" : ast.mb_towc == utf8_mbtowc ? " utf8_mbtowc" : ast.mb_towc == mbtowc ? " mbtowc"
#ifdef mb_state
					: ast.mb_towc == sjis_mbtowc ? " sjis_mbtowc"
#endif
					: ""
				, ast.mb_width == debug_wcwidth ? " debug_wcwidth" : ast.mb_width == utf8_wcwidth ? " utf8_wcwidth" : ast.mb_width == wcwidth ? " wcwidth" : ast.mb_width == default_wcwidth ? " default_wcwidth" : ""
				, ast.mb_conv == debug_wctomb ? " debug_wctomb" : ast.mb_conv == utf8_wctomb ? " utf8_wctomb" : ast.mb_conv == wctomb ? " wctomb" : ""
				, ast.mb_alpha == debug_alpha ? " debug_alpha" : ast.mb_alpha == utf8_alpha ? " utf8_alpha" : ast.mb_alpha == (Isw_f)iswalpha ? " iswalpha" : ""
			);
		else if (category == AST_LC_NUMERIC)
		{
			Lc_numeric_t*		dp = (Lc_numeric_t*)LCINFO(category)->data;

			sfprintf(sfstderr, " decimal='%c' thousands='%c'", dp->decimal, dp->thousand >= 0 ? dp->thousand : 'X');
		}
		if ((locales[category]->flags | lc_categories[category].flags) & LC_default)
			sfprintf(sfstderr, " default");
		if ((locales[category]->flags | lc_categories[category].flags) & LC_local)
			sfprintf(sfstderr, " local");
		if ((locales[category]->flags | lc_categories[category].flags) & LC_setlocale)
			sfprintf(sfstderr, " setlocale");
		if ((locales[category]->flags | lc_categories[category].flags) & LC_setenv)
			sfprintf(sfstderr, " setenv");
		sfprintf(sfstderr, "\n");
	}
	return (char*)lc->name;
}

/*
 * set composite AST_LC_ALL locale categories
 * return <0:composite-error 0:not-composite >0:composite-ok
 */

static int
composite(const char* s, int initialize)
{
	const char*	t;
	int		i;
	int		j;
	int		k;
	int		n;
	int		m;
	const char*	w;
	Lc_t*		p;
	int		cat[AST_LC_COUNT];
	int		stk[AST_LC_COUNT];
	char		buf[PATH_MAX / 2];

	k = n = 0;
	while (s[0] == 'L' && s[1] == 'C' && s[2] == '_')
	{
		n++;
		j = 0;
		w = s;
		for (i = 1; i < AST_LC_COUNT; i++)
		{
			s = w;
			t = lc_categories[i].name;
			while (*t && *s++ == *t++);
			if (!*t && *s++ == '=')
			{
				cat[j++] = i;
				if (s[0] != 'L' || s[1] != 'C' || s[2] != '_')
					break;
				w = s;
				i = -1;
			}
		}
		for (s = w; *s && *s != '='; s++);
		if (!*s)
		{
			for (i = 0; i < k; i++)
				single(stk[i], NULL, 0);
			return -1;
		}
		w = ++s;
		for (;;)
		{
			if (!*s)
			{
				p = lcmake(w);
				break;
			}
			else if (*s++ == ';')
			{
				if ((m = s - w - 1) >= sizeof(buf))
					m = sizeof(buf) - 1;
				memcpy(buf, w, m);
				buf[m] = 0;
				p = lcmake(buf);
				break;
			}
		}
		for (i = 0; i < j; i++)
			if (!initialize)
			{
				if (!single(cat[i], p, 0))
				{
					for (i = 0; i < k; i++)
						single(stk[i], NULL, 0);
					return -1;
				}
				stk[k++] = cat[i];
			}
			else if (!lc_categories[cat[i]].prev && !(ast.locale.set & AST_LC_internal))
				lc_categories[cat[i]].prev = p;
	}
	while (s[0] == '/' && s[1] && n < (AST_LC_COUNT - 1))
	{
		n++;
		for (w = ++s; *s && *s != '/'; s++);
		if (!*s)
			p = lcmake(w);
		else
		{
			if ((j = s - w - 1) >= sizeof(buf))
				j = sizeof(buf) - 1;
			memcpy(buf, w, j);
			buf[j] = 0;
			p = lcmake(buf);
		}
		if (!initialize)
		{
			if (!single(n, p, 0))
			{
				for (i = 1; i < n; i++)
					single(i, NULL, 0);
				return -1;
			}
		}
		else if (!lc_categories[n].prev && !(ast.locale.set & AST_LC_internal))
			lc_categories[n].prev = p;
	}
	return n;
}

/*
 * setlocale() intercept
 *
 * locale:
 *	0	query
 *	""	initialize from environment (if LC_ALL)
 *	""	AST_LC_setenv: value unset (defer to LANG)
 *	"*"	AST_LC_setenv: value set (defer to LC_ALL)
 *	*	set (override LC_ALL)
 */

char*
_ast_setlocale(int category, const char* locale)
{
	char*			s;
	int			i;
	int			j;
	int			k;
	int			f;
	Lc_t*			p;
	int			cat[AST_LC_COUNT];

	static Sfio_t*		sp;
	static int		initialized;
	static const char	local[] = "local";

	if ((category = lcindex(category, 0)) < 0)
		return NULL;
	if (!locale)
	{
		/*
		 * return the current state
		 */

	compose:
		if (category != AST_LC_ALL && category != AST_LC_LANG)
			return (char*)locales[category]->name;
		if (!sp && !(sp = sfstropen()))
			return NULL;
		for (i = 1; i < AST_LC_COUNT; i++)
			cat[i] = -1;
		for (i = 1, k = 0; i < AST_LC_COUNT; i++)
			if (cat[i] < 0)
			{
				k++;
				cat[i] = i;
				for (j = i + 1; j < AST_LC_COUNT; j++)
					if (locales[j] == locales[i])
						cat[j] = i;
			}
		if (k == 1)
			return (char*)locales[1]->name;
		for (i = 1; i < AST_LC_COUNT; i++)
			if (cat[i] >= 0 && !(locales[i]->flags & LC_default))
			{
				if (sfstrtell(sp))
					sfprintf(sp, ";");
				for (j = i, k = cat[i]; j < AST_LC_COUNT; j++)
					if (cat[j] == k)
					{
						cat[j] = -1;
						sfprintf(sp, "%s=", lc_categories[j].name);
					}
				sfprintf(sp, "%s", locales[i]->name);
			}
		if (!sfstrtell(sp))
			return (char*)locales[0]->name;
		return sfstruse(sp);
	}
	if (!ast.locale.serial++)
	{
		stropt(getenv("LC_OPTIONS"), options, sizeof(*options), setopt, NULL);
		initialized = 0;
	}
	if ((ast.locale.set & (AST_LC_debug|AST_LC_setlocale)) && !(ast.locale.set & AST_LC_internal))
	{
		header();
		sfprintf(sfstderr, "locale user %17s %16s %16s %16s%s%s\n", category == AST_LC_LANG ? "LANG" : lc_categories[category].name, locale && !*locale ? "''" : locale, "", "", initialized ? "" : " initial", (ast.locale.set & AST_LC_setenv) ? " setenv" : "");
	}
	if (ast.locale.set & AST_LC_setenv)
	{
		f = LC_setenv;
		p = *locale ? lcmake(locale) : NULL;
	}
	else if (*locale)
	{
		f = LC_setlocale;
		p = lcmake(locale);
	}
	else if (category == AST_LC_ALL)
	{
		if (!initialized)
		{
			char*	u;

			/*
			 * initialize from the environment
			 * precedence determined by X/Open
			 */

			u = 0;
			if ((s = getenv("LANG")) && *s)
			{
				if (u && streq(s, local))
					s = u;
				lang = lcmake(s);
			}
			else
				lang = 0;
			if ((s = getenv("LC_ALL")) && *s)
			{
				if (u && streq(s, local))
					s = u;
				lc_all = lcmake(s);
			}
			else
				lc_all = 0;
			for (i = 1; i < AST_LC_COUNT; i++)
				if (lc_categories[i].flags & LC_setlocale)
					/* explicitly set by setlocale() */;
				else if ((s = getenv(lc_categories[i].name)) && *s)
				{
					if (u && streq(s, local))
						s = u;
					lc_categories[i].prev = lcmake(s);
				}
				else
					lc_categories[i].prev = 0;
			for (i = 1; i < AST_LC_COUNT; i++)
				if (!single(i, lc_all && !(lc_categories[i].flags & LC_setlocale) ? lc_all : lc_categories[i].prev, 0))
				{
					while (i--)
						single(i, NULL, 0);
					return NULL;
				}
			if (ast.locale.set & AST_LC_debug)
				for (i = 1; i < AST_LC_COUNT; i++)
					sfprintf(sfstderr, "locale env  %17s %16s %16s %16s\n", lc_categories[i].name, locales[i]->name, "", lc_categories[i].prev ? lc_categories[i].prev->name : NULL);
			initialized = 1;
		}
		goto compose;
	}
	else if (category == AST_LC_LANG || !(p = lc_categories[category].prev))
	{
		f = 0;
		p = lcmake("C");
	}
	else
		f = 0;
	if (category == AST_LC_LANG)
	{
		if (lang != p)
		{
			lang = p;
			if (!lc_all)
				for (i = 1; i < AST_LC_COUNT; i++)
					if (!single(i, lc_categories[i].prev, 0))
					{
						while (i--)
							single(i, NULL, 0);
						return NULL;
					}
		}
	}
	else if (category != AST_LC_ALL)
	{
		if (f || !lc_all)
			return single(category, p, f);
		if (p && !(ast.locale.set & AST_LC_internal))
			lc_categories[category].prev = p;
		return (char*)locales[category]->name;
	}
	else if (composite(locale, 0) < 0)
		return NULL;
	else if (lc_all != p)
	{
		lc_all = p;
		for (i = 1; i < AST_LC_COUNT; i++)
			if (!single(i, lc_all && !(lc_categories[i].flags & LC_setlocale) ? lc_all : lc_categories[i].prev, 0))
			{
				while (i--)
					single(i, NULL, 0);
				return NULL;
			}
	}
	goto compose;
}
