oniguruma/src/regenc.c

/**********************************************************************
  regenc.c -  Oniguruma (regular expression library)
**********************************************************************/
/*-
 * Copyright (c) 2002-2019  K.Kosako
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "regint.h"

OnigEncoding OnigEncDefaultCharEncoding = ONIG_ENCODING_INIT_DEFAULT;

#define INITED_LIST_SIZE  20

static int InitedListNum;

static struct {
  OnigEncoding enc;
  int          inited;
} InitedList[INITED_LIST_SIZE];

static int
enc_inited_entry(OnigEncoding enc)
{
  int i;

  for (i = 0; i < InitedListNum; i++) {
    if (InitedList[i].enc == enc) {
      InitedList[i].inited = 1;
      return i;
    }
  }

  i = InitedListNum;
  if (i < INITED_LIST_SIZE - 1) {
    InitedList[i].enc    = enc;
    InitedList[i].inited = 1;
    InitedListNum++;
    return i;
  }

  return -1;
}

static int
enc_is_inited(OnigEncoding enc)
{
  int i;

  for (i = 0; i < InitedListNum; i++) {
    if (InitedList[i].enc == enc) {
      return InitedList[i].inited;
    }
  }

  return 0;
}

static int OnigEncInited;

extern int
onigenc_init(void)
{
  if (OnigEncInited != 0) return 0;

  OnigEncInited = 1;
  return 0;
}

extern int
onigenc_end(void)
{
  int i;

  for (i = 0; i < InitedListNum; i++) {
    InitedList[i].enc    = 0;
    InitedList[i].inited = 0;
  }
  InitedListNum = 0;

  OnigEncInited = 0;
  return ONIG_NORMAL;
}

extern int
onig_initialize_encoding(OnigEncoding enc)
{
  int r;

  if (enc != ONIG_ENCODING_ASCII &&
      ONIGENC_IS_ASCII_COMPATIBLE_ENCODING(enc)) {
    OnigEncoding ascii = ONIG_ENCODING_ASCII;
    if (ascii->init != 0 && enc_is_inited(ascii) == 0) {
      r = ascii->init();
      if (r != ONIG_NORMAL) return r;
      enc_inited_entry(ascii);
    }
  }

  if (enc->init != 0 &&
      enc_is_inited(enc) == 0) {
    r = (enc->init)();
    if (r == ONIG_NORMAL)
      enc_inited_entry(enc);
    return r;
  }

  return 0;
}

extern OnigEncoding
onigenc_get_default_encoding(void)
{
  return OnigEncDefaultCharEncoding;
}

extern int
onigenc_set_default_encoding(OnigEncoding enc)
{
  OnigEncDefaultCharEncoding = enc;
  return 0;
}

extern UChar*
onigenc_strdup(OnigEncoding enc, const UChar* s, const UChar* end)
{
  int slen, term_len, i;
  UChar *r;

  slen = (int )(end - s);
  term_len = ONIGENC_MBC_MINLEN(enc);

  r = (UChar* )xmalloc(slen + term_len);
  CHECK_NULL_RETURN(r);
  xmemcpy(r, s, slen);

  for (i = 0; i < term_len; i++)
    r[slen + i] = (UChar )0;

  return r;
}

extern UChar*
onigenc_get_right_adjust_char_head(OnigEncoding enc, const UChar* start, const UChar* s)
{
  UChar* p = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, start, s);
  if (p < s) {
    p += enclen(enc, p);
  }
  return p;
}

extern UChar*
onigenc_get_right_adjust_char_head_with_prev(OnigEncoding enc,
            const UChar* start, const UChar* s, const UChar** prev)
{
  UChar* p = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, start, s);

  if (p < s) {
    if (prev) *prev = (const UChar* )p;
    p += enclen(enc, p);
  }
  else {
    if (prev)
      *prev = onigenc_get_prev_char_head(enc, start, p);
  }
  return p;
}

extern UChar*
onigenc_get_prev_char_head(OnigEncoding enc, const UChar* start, const UChar* s)
{
  if (s <= start)
    return (UChar* )NULL;

  return ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, start, s - 1);
}

extern UChar*
onigenc_step_back(OnigEncoding enc, const UChar* start, const UChar* s, int n)
{
  while (ONIG_IS_NOT_NULL(s) && n-- > 0) {
    if (s <= start)
      return (UChar* )NULL;

    s = ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, start, s - 1);
  }
  return (UChar* )s;
}

extern UChar*
onigenc_step(OnigEncoding enc, const UChar* p, const UChar* end, int n)
{
  UChar* q = (UChar* )p;
  while (n-- > 0) {
    q += ONIGENC_MBC_ENC_LEN(enc, q);
  }
  return (q <= end ? q : NULL);
}

extern int
onigenc_strlen(OnigEncoding enc, const UChar* p, const UChar* end)
{
  int n = 0;
  UChar* q = (UChar* )p;

  while (q < end) {
    q += ONIGENC_MBC_ENC_LEN(enc, q);
    n++;
  }
  return n;
}

extern int
onigenc_strlen_null(OnigEncoding enc, const UChar* s)
{
  int n = 0;
  UChar* p = (UChar* )s;

  while (1) {
    if (*p == '\0') {
      UChar* q;
      int len = ONIGENC_MBC_MINLEN(enc);

      if (len == 1) return n;
      q = p + 1;
      while (len > 1) {
        if (*q != '\0') break;
        q++;
        len--;
      }
      if (len == 1) return n;
    }
    p += ONIGENC_MBC_ENC_LEN(enc, p);
    n++;
  }
}

extern int
onigenc_str_bytelen_null(OnigEncoding enc, const UChar* s)
{
  UChar* start = (UChar* )s;
  UChar* p = (UChar* )s;

  while (1) {
    if (*p == '\0') {
      UChar* q;
      int len = ONIGENC_MBC_MINLEN(enc);

      if (len == 1) return (int )(p - start);
      q = p + 1;
      while (len > 1) {
        if (*q != '\0') break;
        q++;
        len--;
      }
      if (len == 1) return (int )(p - start);
    }
    p += ONIGENC_MBC_ENC_LEN(enc, p);
  }
}

const UChar OnigEncAsciiToLowerCaseTable[] = {
  '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
  '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
  '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
  '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
  '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
  '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
  '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};

#ifdef USE_UPPER_CASE_TABLE
const UChar OnigEncAsciiToUpperCaseTable[256] = {
  '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  '\100', '\101', '\102', '\103', '\104', '\105', '\106', '\107',
  '\110', '\111', '\112', '\113', '\114', '\115', '\116', '\117',
  '\120', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
  '\130', '\131', '\132', '\133', '\134', '\135', '\136', '\137',
  '\140', '\101', '\102', '\103', '\104', '\105', '\106', '\107',
  '\110', '\111', '\112', '\113', '\114', '\115', '\116', '\117',
  '\120', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
  '\130', '\131', '\132', '\173', '\174', '\175', '\176', '\177',
  '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
  '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
  '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
  '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
  '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
};
#endif

const unsigned short OnigEncAsciiCtypeTable[256] = {
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4008, 0x420c, 0x4209, 0x4208, 0x4208, 0x4208, 0x4008, 0x4008,
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4284, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0,
  0x78b0, 0x78b0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x41a0, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x51a0,
  0x41a0, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x4008,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
  0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
};

const UChar OnigEncISO_8859_1_ToLowerCaseTable[256] = {
  '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137',
  '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147',
  '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157',
  '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167',
  '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177',
  '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\327',
  '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\337',
  '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347',
  '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357',
  '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367',
  '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377'
};

#ifdef USE_UPPER_CASE_TABLE
const UChar OnigEncISO_8859_1_ToUpperCaseTable[256] = {
  '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007',
  '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017',
  '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027',
  '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037',
  '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047',
  '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057',
  '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067',
  '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077',
  '\100', '\101', '\102', '\103', '\104', '\105', '\106', '\107',
  '\110', '\111', '\112', '\113', '\114', '\115', '\116', '\117',
  '\120', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
  '\130', '\131', '\132', '\133', '\134', '\135', '\136', '\137',
  '\140', '\101', '\102', '\103', '\104', '\105', '\106', '\107',
  '\110', '\111', '\112', '\113', '\114', '\115', '\116', '\117',
  '\120', '\121', '\122', '\123', '\124', '\125', '\126', '\127',
  '\130', '\131', '\132', '\173', '\174', '\175', '\176', '\177',
  '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207',
  '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217',
  '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227',
  '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237',
  '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247',
  '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257',
  '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267',
  '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277',
  '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
  '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
  '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\327',
  '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\337',
  '\300', '\301', '\302', '\303', '\304', '\305', '\306', '\307',
  '\310', '\311', '\312', '\313', '\314', '\315', '\316', '\317',
  '\320', '\321', '\322', '\323', '\324', '\325', '\326', '\367',
  '\330', '\331', '\332', '\333', '\334', '\335', '\336', '\377',
};
#endif

extern void
onigenc_set_default_caseconv_table(const UChar* table ARG_UNUSED)
{
  /* nothing */
  /* obsoleted. */
}

extern UChar*
onigenc_get_left_adjust_char_head(OnigEncoding enc, const UChar* start, const UChar* s)
{
  return ONIGENC_LEFT_ADJUST_CHAR_HEAD(enc, start, s);
}

const OnigPairCaseFoldCodes OnigAsciiLowerMap[] = {
  { 0x41, 0x61 },
  { 0x42, 0x62 },
  { 0x43, 0x63 },
  { 0x44, 0x64 },
  { 0x45, 0x65 },
  { 0x46, 0x66 },
  { 0x47, 0x67 },
  { 0x48, 0x68 },
  { 0x49, 0x69 },
  { 0x4a, 0x6a },
  { 0x4b, 0x6b },
  { 0x4c, 0x6c },
  { 0x4d, 0x6d },
  { 0x4e, 0x6e },
  { 0x4f, 0x6f },
  { 0x50, 0x70 },
  { 0x51, 0x71 },
  { 0x52, 0x72 },
  { 0x53, 0x73 },
  { 0x54, 0x74 },
  { 0x55, 0x75 },
  { 0x56, 0x76 },
  { 0x57, 0x77 },
  { 0x58, 0x78 },
  { 0x59, 0x79 },
  { 0x5a, 0x7a }
};

extern int
onigenc_ascii_apply_all_case_fold(OnigCaseFoldType flag ARG_UNUSED,
                                  OnigApplyAllCaseFoldFunc f, void* arg)
{
  OnigCodePoint code;
  int i, r;

  for (i = 0;
       i < (int )(sizeof(OnigAsciiLowerMap)/sizeof(OnigPairCaseFoldCodes));
       i++) {
    code = OnigAsciiLowerMap[i].to;
    r = (*f)(OnigAsciiLowerMap[i].from, &code, 1, arg);
    if (r != 0) return r;

    code = OnigAsciiLowerMap[i].from;
    r = (*f)(OnigAsciiLowerMap[i].to, &code, 1, arg);
    if (r != 0) return r;
  }

  return 0;
}

extern int
onigenc_ascii_get_case_fold_codes_by_str(OnigCaseFoldType flag ARG_UNUSED,
    const OnigUChar* p, const OnigUChar* end ARG_UNUSED,
    OnigCaseFoldCodeItem items[])
{
  if (0x41 <= *p && *p <= 0x5a) {
    items[0].byte_len = 1;
    items[0].code_len = 1;
    items[0].code[0] = (OnigCodePoint )(*p + 0x20);
    return 1;
  }
  else if (0x61 <= *p && *p <= 0x7a) {
    items[0].byte_len = 1;
    items[0].code_len = 1;
    items[0].code[0] = (OnigCodePoint )(*p - 0x20);
    return 1;
  }
  else
    return 0;
}

static int
ss_apply_all_case_fold(OnigCaseFoldType flag ARG_UNUSED,
                       OnigApplyAllCaseFoldFunc f, void* arg)
{
  static OnigCodePoint ss[] = { 0x73, 0x73 };

  return (*f)((OnigCodePoint )0xdf, ss, 2, arg);
}

extern int
onigenc_apply_all_case_fold_with_map(int map_size,
    const OnigPairCaseFoldCodes map[],
    int ess_tsett_flag, OnigCaseFoldType flag,
    OnigApplyAllCaseFoldFunc f, void* arg)
{
  OnigCodePoint code;
  int i, r;

  r = onigenc_ascii_apply_all_case_fold(flag, f, arg);
  if (r != 0) return r;

  for (i = 0; i < map_size; i++) {
    code = map[i].to;
    r = (*f)(map[i].from, &code, 1, arg);
    if (r != 0) return r;

    code = map[i].from;
    r = (*f)(map[i].to, &code, 1, arg);
    if (r != 0) return r;
  }

  if (ess_tsett_flag != 0)
    return ss_apply_all_case_fold(flag, f, arg);

  return 0;
}

extern int
onigenc_get_case_fold_codes_by_str_with_map(int map_size,
    const OnigPairCaseFoldCodes map[],
    int ess_tsett_flag, OnigCaseFoldType flag ARG_UNUSED,
    const OnigUChar* p, const OnigUChar* end, OnigCaseFoldCodeItem items[])
{
  if (0x41 <= *p && *p <= 0x5a) {
    items[0].byte_len = 1;
    items[0].code_len = 1;
    items[0].code[0] = (OnigCodePoint )(*p + 0x20);
    if (*p == 0x53 && ess_tsett_flag != 0 && end > p + 1
        && (*(p+1) == 0x53 || *(p+1) == 0x73)) {
      /* SS */
      items[1].byte_len = 2;
      items[1].code_len = 1;
      items[1].code[0] = (OnigCodePoint )0xdf;
      return 2;
    }
    else
      return 1;
  }
  else if (0x61 <= *p && *p <= 0x7a) {
    items[0].byte_len = 1;
    items[0].code_len = 1;
    items[0].code[0] = (OnigCodePoint )(*p - 0x20);
    if (*p == 0x73 && ess_tsett_flag != 0 && end > p + 1
        && (*(p+1) == 0x73 || *(p+1) == 0x53)) {
      /* ss */
      items[1].byte_len = 2;
      items[1].code_len = 1;
      items[1].code[0] = (OnigCodePoint )0xdf;
      return 2;
    }
    else
      return 1;
  }
  else if (*p == 0xdf && ess_tsett_flag != 0) {
    items[0].byte_len = 1;
    items[0].code_len = 2;
    items[0].code[0] = (OnigCodePoint )'s';
    items[0].code[1] = (OnigCodePoint )'s';

    items[1].byte_len = 1;
    items[1].code_len = 2;
    items[1].code[0] = (OnigCodePoint )'S';
    items[1].code[1] = (OnigCodePoint )'S';

    items[2].byte_len = 1;
    items[2].code_len = 2;
    items[2].code[0] = (OnigCodePoint )'s';
    items[2].code[1] = (OnigCodePoint )'S';

    items[3].byte_len = 1;
    items[3].code_len = 2;
    items[3].code[0] = (OnigCodePoint )'S';
    items[3].code[1] = (OnigCodePoint )'s';

    return 4;
  }
  else {
    int i;

    for (i = 0; i < map_size; i++) {
      if (*p == map[i].from) {
        items[0].byte_len = 1;
        items[0].code_len = 1;
        items[0].code[0] = map[i].to;
        return 1;
      }
      else if (*p == map[i].to) {
        items[0].byte_len = 1;
        items[0].code_len = 1;
        items[0].code[0] = map[i].from;
        return 1;
      }
    }
  }

  return 0;
}


extern int
onigenc_not_support_get_ctype_code_range(OnigCtype ctype ARG_UNUSED,
                                         OnigCodePoint* sb_out ARG_UNUSED,
                                         const OnigCodePoint* ranges[] ARG_UNUSED)
{
  return ONIG_NO_SUPPORT_CONFIG;
}

extern int
onigenc_is_mbc_newline_0x0a(const UChar* p, const UChar* end)
{
  if (p < end) {
    if (*p == 0x0a) return 1;
  }
  return 0;
}

/* for single byte encodings */
extern int
onigenc_ascii_mbc_case_fold(OnigCaseFoldType flag ARG_UNUSED, const UChar** p,
                            const UChar*end ARG_UNUSED, UChar* lower)
{
  *lower = ONIGENC_ASCII_CODE_TO_LOWER_CASE(**p);

  (*p)++;
  return 1; /* return byte length of converted char to lower */
}

extern int
onigenc_single_byte_mbc_enc_len(const UChar* p ARG_UNUSED)
{
  return 1;
}

extern OnigCodePoint
onigenc_single_byte_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
{
  return (OnigCodePoint )(*p);
}

extern int
onigenc_single_byte_code_to_mbclen(OnigCodePoint code ARG_UNUSED)
{
  return (code < 0x100 ? 1 : ONIGERR_INVALID_CODE_POINT_VALUE);
}

extern int
onigenc_single_byte_code_to_mbc(OnigCodePoint code, UChar *buf)
{
  *buf = (UChar )(code & 0xff);
  return 1;
}

extern UChar*
onigenc_single_byte_left_adjust_char_head(const UChar* start ARG_UNUSED,
                                          const UChar* s)
{
  return (UChar* )s;
}

extern int
onigenc_always_true_is_allowed_reverse_match(const UChar* s   ARG_UNUSED,
                                             const UChar* end ARG_UNUSED)
{
  return TRUE;
}

extern int
onigenc_always_false_is_allowed_reverse_match(const UChar* s   ARG_UNUSED,
                                              const UChar* end ARG_UNUSED)
{
  return FALSE;
}

extern int
onigenc_always_true_is_valid_mbc_string(const UChar* s   ARG_UNUSED,
                                        const UChar* end ARG_UNUSED)
{
  return TRUE;
}

extern int
onigenc_length_check_is_valid_mbc_string(OnigEncoding enc,
                                         const UChar* p, const UChar* end)
{
  while (p < end) {
    p += enclen(enc, p);
  }

  if (p != end)
    return FALSE;
  else
    return TRUE;
}

extern int
onigenc_is_valid_mbc_string(OnigEncoding enc, const UChar* s, const UChar* end)
{
  return ONIGENC_IS_VALID_MBC_STRING(enc, s, end);
}

extern OnigCodePoint
onigenc_mbn_mbc_to_code(OnigEncoding enc, const UChar* p, const UChar* end)
{
  int c, i, len;
  OnigCodePoint n;

  len = enclen(enc, p);
  n = (OnigCodePoint )(*p++);
  if (len == 1) return n;

  for (i = 1; i < len; i++) {
    if (p >= end) break;
    c = *p++;
    n <<= 8;  n += c;
  }
  return n;
}

extern int
onigenc_mbn_mbc_case_fold(OnigEncoding enc, OnigCaseFoldType flag ARG_UNUSED,
                          const UChar** pp, const UChar* end ARG_UNUSED,
                          UChar* lower)
{
  int len;
  const UChar *p = *pp;

  if (ONIGENC_IS_MBC_ASCII(p)) {
    *lower = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
    (*pp)++;
    return 1;
  }
  else {
    int i;

    len = enclen(enc, p);
    for (i = 0; i < len; i++) {
      *lower++ = *p++;
    }
    (*pp) += len;
    return len; /* return byte length of converted to lower char */
  }
}

extern int
onigenc_mb2_code_to_mbc(OnigEncoding enc, OnigCodePoint code, UChar *buf)
{
  UChar *p = buf;

  if ((code & 0xff00) != 0) {
    *p++ = (UChar )((code >>  8) & 0xff);
  }
  *p++ = (UChar )(code & 0xff);

#if 1
  if (enclen(enc, buf) != (p - buf))
    return ONIGERR_INVALID_CODE_POINT_VALUE;
#endif
  return (int )(p - buf);
}

extern int
onigenc_mb4_code_to_mbc(OnigEncoding enc, OnigCodePoint code, UChar *buf)
{
  UChar *p = buf;

  if ((code & 0xff000000) != 0) {
    *p++ = (UChar )((code >> 24) & 0xff);
  }
  if ((code & 0xff0000) != 0 || p != buf) {
    *p++ = (UChar )((code >> 16) & 0xff);
  }
  if ((code & 0xff00) != 0 || p != buf) {
    *p++ = (UChar )((code >> 8) & 0xff);
  }
  *p++ = (UChar )(code & 0xff);

#if 1
  if (enclen(enc, buf) != (p - buf))
    return ONIGERR_INVALID_CODE_POINT_VALUE;
#endif
  return (int )(p - buf);
}

extern int
onigenc_minimum_property_name_to_ctype(OnigEncoding enc, UChar* p, UChar* end)
{
  static PosixBracketEntryType PBS[] = {
    { (UChar* )"Alnum",  ONIGENC_CTYPE_ALNUM,  5 },
    { (UChar* )"Alpha",  ONIGENC_CTYPE_ALPHA,  5 },
    { (UChar* )"Blank",  ONIGENC_CTYPE_BLANK,  5 },
    { (UChar* )"Cntrl",  ONIGENC_CTYPE_CNTRL,  5 },
    { (UChar* )"Digit",  ONIGENC_CTYPE_DIGIT,  5 },
    { (UChar* )"Graph",  ONIGENC_CTYPE_GRAPH,  5 },
    { (UChar* )"Lower",  ONIGENC_CTYPE_LOWER,  5 },
    { (UChar* )"Print",  ONIGENC_CTYPE_PRINT,  5 },
    { (UChar* )"Punct",  ONIGENC_CTYPE_PUNCT,  5 },
    { (UChar* )"Space",  ONIGENC_CTYPE_SPACE,  5 },
    { (UChar* )"Upper",  ONIGENC_CTYPE_UPPER,  5 },
    { (UChar* )"XDigit", ONIGENC_CTYPE_XDIGIT, 6 },
    { (UChar* )"ASCII",  ONIGENC_CTYPE_ASCII,  5 },
    { (UChar* )"Word",   ONIGENC_CTYPE_WORD,   4 },
    { (UChar* )NULL, -1, 0 }
  };

  PosixBracketEntryType *pb;
  int len;

  len = onigenc_strlen(enc, p, end);
  for (pb = PBS; IS_NOT_NULL(pb->name); pb++) {
    if (len == pb->len &&
        onigenc_with_ascii_strncmp(enc, p, end, pb->name, pb->len) == 0)
      return pb->ctype;
  }

  return ONIGERR_INVALID_CHAR_PROPERTY_NAME;
}

extern int
onigenc_is_mbc_word_ascii(OnigEncoding enc, UChar* s, const UChar* end)
{
  OnigCodePoint code = ONIGENC_MBC_TO_CODE(enc, s, end);

  if (code > 127) return 0;

  return ONIGENC_IS_ASCII_CODE_WORD(code);
}

extern int
onigenc_mb2_is_code_ctype(OnigEncoding enc, OnigCodePoint code,
                          unsigned int ctype)
{
  if (code < 128)
    return ONIGENC_IS_ASCII_CODE_CTYPE(code, ctype);
  else {
    if (CTYPE_IS_WORD_GRAPH_PRINT(ctype)) {
      return (ONIGENC_CODE_TO_MBCLEN(enc, code) > 1 ? TRUE : FALSE);
    }
  }

  return FALSE;
}

extern int
onigenc_mb4_is_code_ctype(OnigEncoding enc, OnigCodePoint code,
                          unsigned int ctype)
{
  if (code < 128)
    return ONIGENC_IS_ASCII_CODE_CTYPE(code, ctype);
  else {
    if (CTYPE_IS_WORD_GRAPH_PRINT(ctype)) {
      return (ONIGENC_CODE_TO_MBCLEN(enc, code) > 1 ? TRUE : FALSE);
    }
  }

  return FALSE;
}

extern int
onigenc_with_ascii_strncmp(OnigEncoding enc, const UChar* p, const UChar* end,
                           const UChar* sascii /* ascii */, int n)
{
  int x, c;

  while (n-- > 0) {
    if (p >= end) return (int )(*sascii);

    c = (int )ONIGENC_MBC_TO_CODE(enc, p, end);
    x = *sascii - c;
    if (x) return x;

    sascii++;
    p += enclen(enc, p);
  }
  return 0;
}

extern int
onig_codes_cmp(OnigCodePoint a[], OnigCodePoint b[], int n)
{
  int i;

  for (i = 0; i < n; i++) {
    if (a[i] != b[i])
      return -1;
  }

  return 0;
}

extern int
onig_codes_byte_at(OnigCodePoint codes[], int at)
{
  int index;
  int b;
  OnigCodePoint code;

  index = at / 3;
  b     = at % 3;
  code = codes[index];

  return ((code >> ((2 - b) * 8)) & 0xff);
}