#include <iconv.h>
#include <errno.h>
#include <wchar.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <stdint.h>

#define UTF_32BE    000
#define UTF_16LE    001
#define UTF_16BE    002
#define UTF_32LE    003
#define UCS2BE      004
#define UCS2LE      005
#define WCHAR_T     007

#define US_ASCII    021
#define UTF_8       022
#define LATIN_9     024
#define TIS_620     025
#define JIS_0201    026

#define EUC         031
#define EUC_TW      032
#define SHIFT_JIS   033
#define BIG5        034
#define GBK         035

/* FIXME: these are not implemented yet
 * EUC:   A1-FE A1-FE
 * GBK:   81-FE 40-7E,80-FE
 * Big5:  A1-FE 40-7E,A1-FE
 */

/* Definitions of charmaps. Each charmap consists of:
 * 1. Empty-string-terminated list of null-terminated aliases.
 * 2. Special type code or bits per character.
 * 3. Number of elided entries (128 for specials).
 * 4. Character table (size determined by fields 2 and 3). */

static const unsigned char charmaps[] =
"utf8\0\0\022\x80"
"wchart\0\0\007\x80"

"ucs2\0ucs2be\0\0\004\x80"
"ucs2le\0\0\005\x80"

"utf16\0utf16be\0\0\002\x80"
"utf16le\0\0\001\x80"

"ucs4\0ucs4be\0utf32\0utf32be\0\0\000\x80"
"ucs4le\0utf32le\0\0\003\x80"

"ascii\0iso646\0usascii\0\0\021\x80"
"latin1\0iso88591\0\0\x09\x80"
"latin9\0iso885915\0\0\024\x80"
"tis620\0iso885911\0\0\025\x80"
"jis0201\0\0\026\x80"

"iso88592\0\0\x0a\x21"
"\x04\x61\x1b\x14\x29\x3d\x69\x75\x0a\x2a"
"\x60\x79\x45\x56\x5e\xad\xf4\xb5\x17\x2c"
"\x05\x6d\x2b\x14\x2d\x3e\x6d\x75\x2c\x2e"
"\x61\x7d\x55\x96\x5e\xdd\xfa\xc5\x17\x55"
"\xc1\x08\x23\x10\x31\x39\x19\x74\x0c\x43"
"\xc9\x60\xb4\x8c\x46\xcd\x38\xe3\x10\x44"
"\x43\x1d\x35\x0d\x35\x50\x59\x73\x0d\x56"
"\x6e\x69\x03\x17\x37\xdd\x88\xf5\x4d\x55"
"\xe1\x88\x33\x10\x39\x3a\x1d\x74\x4e\x43"
"\xe9\x64\xb4\xce\x46\xed\xb8\xf3\x50\x44"
"\x44\x21\x35\x0f\x3d\x51\xd9\x73\x4f\x56"
"\x6f\xe9\x13\x17\x3f\xfd\x8c\x95\x2d"

"iso88593\0\0\x0a\x21"
"\x26\x61\x3b\x0a\x29\x00\x90\x74\x0a\x2a"
"\x30\x79\xe5\x11\x4d\xad\x00\xb0\x17\x2c"
"\x27\xc9\x32\x0b\x2d\xb5\x94\x74\x0b\x2e"
"\x31\x7d\xf5\x51\x4d\xbd\x00\xc0\x17\x30"
"\xc1\x08\x03\x00\x31\x0a\x21\x74\x0c\x32"
"\xc9\x28\xb3\x0c\x33\xcd\x38\xf3\x0c\x00"
"\xd1\x48\x33\x0d\x35\x20\x59\x73\x0d\x47"
"\xd9\x68\xb3\x0d\x37\x6c\x71\xf5\x0d\x38"
"\xe1\x88\x03\x00\x39\x0b\x25\x74\x0e\x3a"
"\xe9\xa8\xb3\x0e\x3b\xed\xb8\xf3\x0e\x00"
"\xf1\xc8\x33\x0f\x3d\x21\xd9\x73\x4f\x47"
"\xf9\xe8\xb3\x0f\x3f\x6d\x75\x95\x2d"

"iso88594\0\0\x0a\x21"
"\x04\xe1\x64\x15\x29\x28\xed\x74\x0a\x2a"
"\x60\x49\x24\x92\x59\xad\xf4\xf5\x0a\x2c"
"\x05\x6d\x7b\x15\x2d\x29\xf1\x74\x2c\x2e"
"\x61\x4d\x34\xd2\x59\x4a\xf9\xb5\x14\x40"
"\xc1\x08\x33\x0c\x31\xc5\x18\xe3\x12\x43"
"\xc9\x60\xb4\x8c\x45\xcd\x38\xa3\x12\x44"
"\x45\x31\x65\x13\x35\xd5\x58\x73\x0d\x36"
"\x72\x69\xb3\x0d\x37\x68\xa9\xf5\x4d\x40"
"\xe1\x88\x33\x0e\x39\xe5\x98\xf3\x52\x43"
"\xe9\x64\xb4\xce\x45\xed\xb8\xb3\x52\x44"
"\x46\x35\x75\x13\x3d\xf5\xd8\x73\x0f\x3e"
"\x73\xe9\xb3\x0f\x3f\x69\xad\x95\x2d"

"iso88595\0\0\x0e\x21"
"\x01\x84\x00\x31\x40\x10\x10\x05\x84\x01"
"\x71\x40\x20\x10\x09\x84\x02\xb1\x40\x30"
"\x10\xad\x80\x03\xf1\x40\x40\x10\x11\x84"
"\x04\x31\x41\x50\x10\x15\x84\x05\x71\x41"
"\x60\x10\x19\x84\x06\xb1\x41\x70\x10\x1d"
"\x84\x07\xf1\x41\x80\x10\x21\x84\x08\x31"
"\x42\x90\x10\x25\x84\x09\x71\x42\xa0\x10"
"\x29\x84\x0a\xb1\x42\xb0\x10\x2d\x84\x0b"
"\xf1\x42\xc0\x10\x31\x84\x0c\x31\x43\xd0"
"\x10\x35\x84\x0d\x71\x43\xe0\x10\x39\x84"
"\x0e\xb1\x43\xf0\x10\x3d\x84\x0f\xf1\x43"
"\x00\x11\x41\x84\x10\x31\x44\x10\x11\x45"
"\x84\x11\x71\x44\x20\x11\x49\x84\x12\xb1"
"\x44\x30\x11\x4d\x84\x13\xf1\x44\x58\x84"
"\x51\x84\x14\x31\x45\x50\x11\x55\x84\x15"
"\x71\x45\x60\x11\x59\x84\x16\xb1\x45\x70"
"\x11\xa7\x80\x17\xf1\x45\x00"

"iso88596\0\0\x0b\x21"
"\x00\x00\x00\x00\x48\x01\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x18\xdc\x0a\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\xc0\x86\x01\x00\x00"
"\x00\x7c\x18\x00\x21\x16\xf1\x88\x49\x5c"
"\x62\x13\x9f\x18\xc5\x29\x56\xf1\x8a\x59"
"\xdc\x62\x17\xbf\x18\xc6\x31\x96\xf1\x8c"
"\x69\x5c\x63\x1b\xdf\x18\xc7\x39\xd6\x31"
"\x00\x00\x00\x00\x00\x00\x00\xc8\x41\x16"
"\xf2\x90\x89\x5c\x64\x23\x1f\x19\xc9\x49"
"\x56\xf2\x92\x99\xdc\x64\x27\x3f\x19\xca"
"\x51\x96\x32\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00"

"iso88597\0\0\x0e\x21"
"\x18\x60\x06\x38\x0a\xb0\x82\xaf\xa0\x29"
"\x70\x0a\xa0\x02\xa9\x80\xde\xb0\x0a\xb0"
"\x02\xad\x00\x00\x50\x01\xc2\x02\xb1\x80"
"\x2c\x30\x0b\x10\x0e\x85\x83\xe1\x70\x0b"
"\x20\x0e\x89\x83\xe2\xb0\x0b\x30\x0e\xbd"
"\x80\xe3\xf0\x38\x40\x0e\x91\x83\xe4\x30"
"\x39\x50\x0e\x95\x83\xe5\x70\x39\x60\x0e"
"\x99\x83\xe6\xb0\x39\x70\x0e\x9d\x83\xe7"
"\xf0\x39\x80\x0e\xa1\x03\x00\x30\x3a\x90"
"\x0e\xa5\x83\xe9\x70\x3a\xa0\x0e\xa9\x83"
"\xea\xb0\x3a\xb0\x0e\xad\x83\xeb\xf0\x3a"
"\xc0\x0e\xb1\x83\xec\x30\x3b\xd0\x0e\xb5"
"\x83\xed\x70\x3b\xe0\x0e\xb9\x83\xee\xb0"
"\x3b\xf0\x0e\xbd\x83\xef\xf0\x3b\x00\x0f"
"\xc1\x83\xf0\x30\x3c\x10\x0f\xc5\x83\xf1"
"\x70\x3c\x20\x0f\xc9\x83\xf2\xb0\x3c\x30"
"\x0f\xcd\x83\xf3\x00\x00\x00"

"iso88598\0\0\x0e\x21"
"\x00\x80\x28\x30\x0a\x90\x02\xa5\x80\x29"
"\x70\x0a\xa0\x02\xa9\xc0\x35\xb0\x0a\xb0"
"\x02\xad\x80\x2b\xf0\x0a\xc0\x02\xb1\x80"
"\x2c\x30\x0b\xd0\x02\xb5\x80\x2d\x70\x0b"
"\xe0\x02\xb9\xc0\x3d\xb0\x0b\xf0\x02\xbd"
"\x80\x2f\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x70\x01"
"\x42\x17\xd1\x85\x74\x31\x5d\x50\x17\xd5"
"\x85\x75\x71\x5d\x60\x17\xd9\x85\x76\xb1"
"\x5d\x70\x17\xdd\x85\x77\xf1\x5d\x80\x17"
"\xe1\x85\x78\x31\x5e\x90\x17\xe5\x85\x79"
"\x71\x5e\xa0\x17\xe9\x85\x7a\x01\x00\x00"
"\x00\x0e\xe0\x03\x08\x00\x00"

"iso88599\0\0\x09\x50"
"\x1e\xa3\x49\x9b\x46\xad\x9a\xb5\x6b\xd8"
"\xb2\x69\xdb\xc6\x0d\xa6\xd7\x6f\xe0\xc2"
"\x89\x1b\x47\xae\x9c\xb9\x73\xe8\xd2\xa9"
"\x5b\xc7\xae\x9d\xbb\x77\x1f\xe3\xc9\x9b"
"\x47\xaf\x9e\xbd\x7b\xf8\xf2\xe9\xdb\xc7"
"\x2f\xe6\xd7\x7f"

"iso885910\0\0\x0e\x21"
"\x04\x81\x44\x20\x12\xa8\x04\x28\x81\x4d"
"\x70\x0a\xec\x04\x10\x01\x58\x60\x16\xf4"
"\x05\xad\x80\x5a\xa0\x14\xc0\x02\x05\xc1"
"\x44\x30\x12\xac\x04\x29\xc1\x4d\x70\x0b"
"\xf0\x04\x11\x41\x58\x70\x16\xf8\x05\x15"
"\xe0\x5a\xb0\x14\x00\x04\xc1\x80\x30\x30"
"\x0c\x10\x03\xc5\x80\x31\xe0\x12\x30\x04"
"\xc9\x00\x46\xb0\x0c\x58\x04\xcd\x80\x33"
"\xf0\x0c\x40\x03\x45\x01\x53\x30\x0d\x50"
"\x03\xd5\x80\x35\x80\x16\x60\x03\x72\x81"
"\x36\xb0\x0d\x70\x03\xdd\x80\x37\xf0\x0d"
"\x04\x04\xe1\x80\x38\x30\x0e\x90\x03\xe5"
"\x80\x39\xf0\x12\x34\x04\xe9\x40\x46\xb0"
"\x0e\x5c\x04\xed\x80\x3b\xf0\x0e\xc0\x03"
"\x46\x41\x53\x30\x0f\xd0\x03\xf5\x80\x3d"
"\x90\x16\xe0\x03\x73\x81\x3e\xb0\x0f\xf0"
"\x03\xfd\x80\x3f\x80\x13\x00"

"iso885913\0\0\x0e\x21"
"\x1d\xa0\x28\x30\x0a\x90\x02\x1e\xa0\x29"
"\x70\x0a\x60\x03\xa9\x80\x55\xb0\x0a\xb0"
"\x02\xad\x80\x2b\x60\x0c\xc0\x02\xb1\x80"
"\x2c\x30\x0b\x70\x80\xb5\x80\x2d\x70\x0b"
"\xe0\x03\xb9\xc0\x55\xb0\x0b\xf0\x02\xbd"
"\x80\x2f\x60\x0e\x10\x04\x2e\x01\x40\x60"
"\x10\x10\x03\xc5\x00\x46\x20\x11\x30\x04"
"\xc9\x40\x5e\x60\x11\x88\x04\x36\x81\x4a"
"\xb0\x13\x80\x05\x43\x41\x51\x30\x0d\x30"
"\x05\xd5\x80\x35\x70\x0d\xc8\x05\x41\x81"
"\x56\xa0\x16\x70\x03\x7b\x41\x5f\xf0\x0d"
"\x14\x04\x2f\x41\x40\x70\x10\x90\x03\xe5"
"\x40\x46\x30\x11\x34\x04\xe9\x80\x5e\x70"
"\x11\x8c\x04\x37\xc1\x4a\xc0\x13\x84\x05"
"\x44\x81\x51\x30\x0f\x34\x05\xf5\x80\x3d"
"\x70\x0f\xcc\x05\x42\xc1\x56\xb0\x16\xf0"
"\x03\x7c\x81\x5f\x90\x01\x02"

"iso885914\0\0\x0d\x21"
"\x02\x7e\xc0\x8f\x02\x85\xb0\x10\x14\xfc"
"\x29\x00\xf4\xa9\x40\xd0\x2f\x78\x79\xdf"
"\x0a\x5c\x01\x5e\xf0\xf0\x1f\x1e\x24\x84"
"\x04\x20\x1f\xe4\x6d\x81\x95\x0f\xf4\x57"
"\x7e\xd0\x83\xf9\x79\x4f\xe8\x0b\x7d\x98"
"\x07\x06\xc1\x40\x18\x0c\x03\x62\x50\x0c"
"\x8c\xc1\x31\x40\x06\xc9\x40\x19\x2c\x03"
"\x66\xd0\x0c\x9c\xc1\x33\xa0\x0b\xd1\x40"
"\x1a\x4c\x03\x6a\x50\x0d\xac\x81\x9a\xc7"
"\x06\xd9\x40\x1b\x6c\x03\x6e\xd0\x0d\xec"
"\xc2\x37\x00\x07\xe1\x40\x1c\x8c\x03\x72"
"\x50\x0e\xcc\xc1\x39\x40\x07\xe9\x40\x1d"
"\xac\x03\x76\xd0\x0e\xdc\xc1\x3b\xa8\x0b"
"\xf1\x40\x1e\xcc\x03\x7a\x50\x0f\xec\xc1"
"\x9a\xc7\x07\xf9\x40\x1f\xec\x03\x7e\xd0"
"\x0f\xee\xc2\x3f\x00"

"iso885916\0\0\x0e\x21"
"\x04\x41\x41\x10\x14\xb0\x82\x1e\x20\x58"
"\x70\x0a\x84\x05\xa9\x00\x86\xb0\x0a\xe4"
"\x05\xad\x80\x5e\xb0\x17\xc0\x02\xb1\x00"
"\x43\x20\x14\xf4\x05\x1d\xa0\x2d\x70\x0b"
"\xf8\x05\x0d\x41\x86\xb0\x0b\x48\x05\x53"
"\x01\x5e\xc0\x17\x00\x03\xc1\x80\x30\x20"
"\x10\x10\x03\x06\x81\x31\x70\x0c\x20\x03"
"\xc9\x80\x32\xb0\x0c\x30\x03\xcd\x80\x33"
"\xf0\x0c\x40\x04\x43\x81\x34\x30\x0d\x50"
"\x03\x50\x81\x35\xa0\x15\xc0\x05\xd9\x80"
"\x36\xb0\x0d\x70\x03\x18\x81\x86\xf0\x0d"
"\x80\x03\xe1\x80\x38\x30\x10\x90\x03\x07"
"\x81\x39\x70\x0e\xa0\x03\xe9\x80\x3a\xb0"
"\x0e\xb0\x03\xed\x80\x3b\xf0\x0e\x44\x04"
"\x44\x81\x3c\x30\x0f\xd0\x03\x51\x81\x3d"
"\xb0\x15\xc4\x05\xf9\x80\x3e\xb0\x0f\xf0"
"\x03\x19\xc1\x86\xf0\x0f\x00"

"windows1252\0\0\x0e\x00"
"\xac\x20\x00\xa0\x01\x4a\x06\x1e\xa0\x09"
"\x08\x02\x86\x80\xc6\x02\x0c\x08\x16\xe4"
"\x80\x52\x01\x00\xd0\x17\x00\x00\x00\x00"
"\x06\x98\x01\x72\x80\x1d\xa0\x08\x38\x01"
"\x52\x80\xdc\x82\x48\x18\x16\xe8\x80\x53"
"\x01\x00\xe0\x17\xe0\x05\xa0\x40\x28\x20"
"\x0a\x8c\x02\xa4\x40\x29\x60\x0a\x9c\x02"
"\xa8\x40\x2a\xa0\x0a\xac\x02\xac\x40\x2b"
"\xe0\x0a\xbc\x02\xb0\x40\x2c\x20\x0b\xcc"
"\x02\xb4\x40\x2d\x60\x0b\xdc\x02\xb8\x40"
"\x2e\xa0\x0b\xec\x02\xbc\x40\x2f\xe0\x0b"
"\xfc\x02\xc0\x40\x30\x20\x0c\x0c\x03\xc4"
"\x40\x31\x60\x0c\x1c\x03\xc8\x40\x32\xa0"
"\x0c\x2c\x03\xcc\x40\x33\xe0\x0c\x3c\x03"
"\xd0\x40\x34\x20\x0d\x4c\x03\xd4\x40\x35"
"\x60\x0d\x5c\x03\xd8\x40\x36\xa0\x0d\x6c"
"\x03\xdc\x40\x37\xe0\x0d\x7c\x03\xe0\x40"
"\x38\x20\x0e\x8c\x03\xe4\x40\x39\x60\x0e"
"\x9c\x03\xe8\x40\x3a\xa0\x0e\xac\x03\xec"
"\x40\x3b\xe0\x0e\xbc\x03\xf0\x40\x3c\x20"
"\x0f\xcc\x03\xf4\x40\x3d\x60\x0f\xdc\x03"
"\xf8\x40\x3e\xa0\x0f\xec\x03\xfc\x40\x3f"
"\xe0\x0f\xfc\x03"
;


static int fuzzycmp(const unsigned char *a, const unsigned char *b)
{
	for (; *a && *b; a++, b++) {
		while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
		if ((*a|32U) != *b) return 1;
	}
	return *a != *b;
}

static size_t find_charmap(const void *name)
{
	const unsigned char *s;
	for (s=charmaps; *s; ) {
		if (!fuzzycmp(name, s)) {
			for (; *s; s+=strlen((void *)s)+1);
			return s+1-charmaps;
		}
		s += strlen((void *)s)+1;
		if (!*s) s += ((128-s[2])*s[1]+7)/8 + 3;
	}
	return -1;
}

iconv_t iconv_open(const char *to, const char *from)
{
	size_t f, t;

	if ((t = find_charmap(to))==-1 || (f = find_charmap(from))==-1) {
		errno = EINVAL;
		return (iconv_t)-1;
	}

	return (void *)(f<<16 | t);
}

int iconv_close(iconv_t cd)
{
	return 0;
}

static unsigned get_16(const unsigned char *s, int e)
{
	e &= 1;
	return s[e]<<8 | s[1-e];
}

static void put_16(unsigned char *s, unsigned c, int e)
{
	e &= 1;
	s[e] = c>>8;
	s[1-e] = c;
}

static unsigned get_32(const unsigned char *s, int e)
{
	return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
}

static void put_32(unsigned char *s, unsigned c, int e)
{
	s[e^0] = c>>24;
	s[e^1] = c>>16;
	s[e^2] = c>>8;
	s[e^3] = c;
}


#define GET_MAPPING(m, i, n) ( (1<<(n))-1 & ( \
	(m)[(i)*(n)/8] >> ((n)%8*(i)%8) | \
	(m)[(i)*(n)/8+1] << 8-((n)%8*(i)%8) | \
	(m)[(i)*(n)/8+2] << 16-((n)%8*(i)%8)     ) )

static unsigned get_mapping(const unsigned char *m, unsigned c, unsigned n)
{
	switch (n) {
	default:
	case 9:  return m[c*9/8]>>c%8 | m[c*9/8+1]<<8-c%8 & (1<<n)-1;
	case 10: return m[c*10/8]>>2*c%8 | m[c*10/8+1]<<8-2*c%8 & (1<<n)-1;
	case 11: return GET_MAPPING(m, c, 11);
	case 13: return GET_MAPPING(m, c, 13);
	case 14: return GET_MAPPING(m, c, 14);
	}
}

/* Adapt as needed */
#define mbrtowc_utf8 mbrtowc
#define wctomb_utf8 wctomb

#include <stdio.h>
size_t iconv(iconv_t cd0, char **in, size_t *inb, char **out, size_t *outb)
{
	size_t x=0;
	unsigned long cd = (unsigned long)cd0;
	unsigned to = cd & 0xffff;
	unsigned from = cd >> 16;
	const unsigned char *map = charmaps+from+2;
	const unsigned char *tomap = charmaps+to+2;
	mbstate_t st = {0};
	wchar_t wc;
	unsigned c, d;
	size_t k, l;
	int err;
	unsigned elide = map[-1] + 128;
	unsigned toelide = tomap[-1] + 128;
	unsigned char type = map[-2];
	unsigned char totype = tomap[-2];

	if (!in || !*in || !*inb) return 0;

	for (; *inb; *in+=l, *inb-=l) {
		c = *(unsigned char *)*in;
		l = 1;
		if (type < 8 || c >= 0x80) switch (type) {
		case UTF_8:
			l = mbrtowc_utf8(&wc, *in, *inb, &st);
			if (!l) l++;
			else if (l == (size_t)-1) goto ilseq;
			else if (l == (size_t)-2) goto starved;
			c = wc;
			break;
		case LATIN_9:
			if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
				static const unsigned char map[] = {
					0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
					0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
					0x52, 0x53, 0x78
				};
				if (c == 0xa4) c = 0x20ac;
				else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
			}
			break;
		case TIS_620:
			if (c >= 0xa1) c += 0x0e01-0xa1;
			break;
		case JIS_0201:
			if (c >= 0xa1)
				if (c <= 0xdf) c += 0xff61-0xa1;
				else goto ilseq;
			break;
		case 9: case 10: case 11: case 13: case 14:
			if (c < elide) break;
			c = get_mapping(map, c-elide, type);
			if (!c) {
		case US_ASCII:
				goto ilseq;
			}
			break;
		case WCHAR_T:
			l = sizeof(wchar_t);
			if (*inb < l) goto starved;
			c = *(wchar_t *)*in;
			if (0) {
		case UTF_32BE:
		case UTF_32LE:
			l = 4;
			if (*inb < 4) goto starved;
			c = get_32((void *)*in, type);
			}
			if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
			break;
		case UCS2BE:
		case UCS2LE:
		case UTF_16BE:
		case UTF_16LE:
			l = 2;
			if (*inb < 2) goto starved;
			c = get_16((void *)*in, type);
			if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
			if ((unsigned)(c-0xd800) < 0x400) {
				if (type-UCS2BE < 2U) goto ilseq;
				l = 4;
				if (*inb < 4) goto starved;
				d = get_16((void *)(*in + 2), from);
				if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
				c = ((c-0xd800)<<10) | (d-0xdc00);
			}
			break;
		}

		switch (totype) {
		case WCHAR_T:
			if (*outb < sizeof(wchar_t)) goto toobig;
			*(wchar_t *)*out = c;
			*out += sizeof(wchar_t);
			*outb -= sizeof(wchar_t);
			break;
		case UTF_8:
			if (*outb < 4) {
				char tmp[4];
				k = wctomb_utf8(tmp, c);
				if (*outb < k) goto toobig;
				memcpy(*out, tmp, k);
			} else k = wctomb_utf8(*out, c);
			*out += k;
			*outb -= k;
			break;
		case TIS_620:
			if (c-0xe01u <= 0xff-0xa1)
				c -= 0xe01-0xa1;
			else if (c >= 0xa1)
				goto ascii;
			goto revout;
		case JIS_0201:
			if (c-0xff61u <= 0xdf-0xa1)
				c -= 0xff61-0xa1;
			else if (c >= 0xa1)
				goto ascii;
			goto revout;
		case LATIN_9:
			if (c == 0x20ac) {
				c=0xa4;
			} else if (c-0x150u<=0x12 && (1<<c-0x150 & 0x3000c)) {
				static const unsigned char map[] =
					{ 0xa6,0xa8,0xbc,0xbd };
				c = map[c&3];
			} else if (c-0x178u<=0x7 && (1<<c-0x178 & 0x61)) {
				static const unsigned char map[] =
					{ 0xbe,0,0,0,0,0xb4,0xb8 };
				c = map[c&7];
			} else if (c>0x100 ||
				c-0xa5u<=0xbeu-0xa5
				&& (1<<c-0xa5 & 0x388800a))
		case US_ASCII: ascii:
			if (c > 0x7f) x++, c='*';
		case 9: case 10: case 11: case 13: case 14:
			if (*outb < 1) goto toobig;
			if (c < toelide) {
			revout:
				*(*out)++ = c;
				*outb -= 1;
				break;
			}
			for (d=0; d<256-toelide; d++) {
				if (c == get_mapping(tomap, d, totype)) {
					c = d + toelide;
					goto revout;
				}
			}
			x++;
			c = '*';
			goto revout;
		case UCS2BE:
		case UCS2LE:
		case UTF_16BE:
		case UTF_16LE:
			if (c < 0x10000) {
				if (*outb < 2) goto toobig;
				put_16((void *)*out, c, totype);
				*out += 2;
				*outb -= 2;
				break;
			}
			if (type-UCS2BE < 2U) goto ilseq;
			if (*outb < 4) goto toobig;
			put_16((void *)*out, (c>>10)|0xd800, totype);
			put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
			*out += 4;
			*outb -= 4;
			break;
		case UTF_32BE:
		case UTF_32LE:
			if (*outb < 4) goto toobig;
			put_32((void *)*out, c, totype);
			*out += 4;
			*outb -= 4;
			break;
		}
	}
	return x;
ilseq:
	err = EILSEQ;
	x = -1;
	goto end;
toobig:
	err = E2BIG;
	goto end;
starved:
	err = EINVAL;
end:
	errno = err;
	return x;
}