/**********************************************************************

  regerror.c -  Oniguruma (regular expression library)

**********************************************************************/

/*-

 * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>

 * 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"

#include <stdio.h> /* for vsnprintf() */

#ifdef HAVE_STDARG_PROTOTYPES

#include <stdarg.h>

#define va_init_list(a,b) va_start(a,b)

#else

#include <varargs.h>

#define va_init_list(a,b) va_start(a)

#endif

extern UChar*

onig_error_code_to_format(int code)

{

  char *p;

  switch (code) {

  case ONIG_MISMATCH:

    p = "mismatch"; break;

  case ONIG_NO_SUPPORT_CONFIG:

    p = "no support in this configuration"; break;

  case ONIG_ABORT:

    p = "abort"; break;

  case ONIGERR_MEMORY:

    p = "fail to memory allocation"; break;

  case ONIGERR_MATCH_STACK_LIMIT_OVER:

    p = "match-stack limit over"; break;

  case ONIGERR_PARSE_DEPTH_LIMIT_OVER:

    p = "parse depth limit over"; break;

  case ONIGERR_RETRY_LIMIT_IN_MATCH_OVER:

    p = "retry-limit-in-match over"; break;

  case ONIGERR_TYPE_BUG:

    p = "undefined type (bug)"; break;

  case ONIGERR_PARSER_BUG:

    p = "internal parser error (bug)"; break;

  case ONIGERR_STACK_BUG:

    p = "stack error (bug)"; break;

  case ONIGERR_UNDEFINED_BYTECODE:

    p = "undefined bytecode (bug)"; break;

  case ONIGERR_UNEXPECTED_BYTECODE:

    p = "unexpected bytecode (bug)"; break;

  case ONIGERR_DEFAULT_ENCODING_IS_NOT_SETTED:

    p = "default multibyte-encoding is not setted"; break;

  case ONIGERR_SPECIFIED_ENCODING_CANT_CONVERT_TO_WIDE_CHAR:

    p = "can't convert to wide-char on specified multibyte-encoding"; break;

  case ONIGERR_FAIL_TO_INITIALIZE:

    p = "fail to initialize"; break;

  case ONIGERR_INVALID_ARGUMENT:

    p = "invalid argument"; break;

  case ONIGERR_END_PATTERN_AT_LEFT_BRACE:

    p = "end pattern at left brace"; break;

  case ONIGERR_END_PATTERN_AT_LEFT_BRACKET:

    p = "end pattern at left bracket"; break;

  case ONIGERR_EMPTY_CHAR_CLASS:

    p = "empty char-class"; break;

  case ONIGERR_PREMATURE_END_OF_CHAR_CLASS:

    p = "premature end of char-class"; break;

  case ONIGERR_END_PATTERN_AT_ESCAPE:

    p = "end pattern at escape"; break;

  case ONIGERR_END_PATTERN_AT_META:

    p = "end pattern at meta"; break;

  case ONIGERR_END_PATTERN_AT_CONTROL:

    p = "end pattern at control"; break;

  case ONIGERR_META_CODE_SYNTAX:

    p = "invalid meta-code syntax"; break;

  case ONIGERR_CONTROL_CODE_SYNTAX:

    p = "invalid control-code syntax"; break;

  case ONIGERR_CHAR_CLASS_VALUE_AT_END_OF_RANGE:

    p = "char-class value at end of range"; break;

  case ONIGERR_CHAR_CLASS_VALUE_AT_START_OF_RANGE:

    p = "char-class value at start of range"; break;

  case ONIGERR_UNMATCHED_RANGE_SPECIFIER_IN_CHAR_CLASS:

    p = "unmatched range specifier in char-class"; break;

  case ONIGERR_TARGET_OF_REPEAT_OPERATOR_NOT_SPECIFIED:

    p = "target of repeat operator is not specified"; break;

  case ONIGERR_TARGET_OF_REPEAT_OPERATOR_INVALID:

    p = "target of repeat operator is invalid"; break;

  case ONIGERR_NESTED_REPEAT_OPERATOR:

    p = "nested repeat operator"; break;

  case ONIGERR_UNMATCHED_CLOSE_PARENTHESIS:

    p = "unmatched close parenthesis"; break;

  case ONIGERR_END_PATTERN_WITH_UNMATCHED_PARENTHESIS:

    p = "end pattern with unmatched parenthesis"; break;

  case ONIGERR_END_PATTERN_IN_GROUP:

    p = "end pattern in group"; break;

  case ONIGERR_UNDEFINED_GROUP_OPTION:

    p = "undefined group option"; break;

  case ONIGERR_INVALID_POSIX_BRACKET_TYPE:

    p = "invalid POSIX bracket type"; break;

  case ONIGERR_INVALID_LOOK_BEHIND_PATTERN:

    p = "invalid pattern in look-behind"; break;

  case ONIGERR_INVALID_REPEAT_RANGE_PATTERN:

    p = "invalid repeat range {lower,upper}"; break;

  case ONIGERR_TOO_BIG_NUMBER:

    p = "too big number"; break;

  case ONIGERR_TOO_BIG_NUMBER_FOR_REPEAT_RANGE:

    p = "too big number for repeat range"; break;

  case ONIGERR_UPPER_SMALLER_THAN_LOWER_IN_REPEAT_RANGE:

    p = "upper is smaller than lower in repeat range"; break;

  case ONIGERR_EMPTY_RANGE_IN_CHAR_CLASS:

    p = "empty range in char class"; break;

  case ONIGERR_MISMATCH_CODE_LENGTH_IN_CLASS_RANGE:

    p = "mismatch multibyte code length in char-class range"; break;

  case ONIGERR_TOO_MANY_MULTI_BYTE_RANGES:

    p = "too many multibyte code ranges are specified"; break;

  case ONIGERR_TOO_SHORT_MULTI_BYTE_STRING:

    p = "too short multibyte code string"; break;

  case ONIGERR_TOO_BIG_BACKREF_NUMBER:

    p = "too big backref number"; break;

  case ONIGERR_INVALID_BACKREF:

    p = "invalid backref number/name"; break;

  case ONIGERR_NUMBERED_BACKREF_OR_CALL_NOT_ALLOWED:

    p = "numbered backref/call is not allowed. (use name)"; break;

  case ONIGERR_TOO_MANY_CAPTURES:

    p = "too many captures"; break;

  case ONIGERR_TOO_BIG_WIDE_CHAR_VALUE:

    p = "too big wide-char value"; break;

  case ONIGERR_TOO_LONG_WIDE_CHAR_VALUE:

    p = "too long wide-char value"; break;

  case ONIGERR_INVALID_CODE_POINT_VALUE:

    p = "invalid code point value"; break;

  case ONIGERR_EMPTY_GROUP_NAME:

    p = "group name is empty"; break;

  case ONIGERR_INVALID_GROUP_NAME:

    p = "invalid group name <%n>"; break;

  case ONIGERR_INVALID_CHAR_IN_GROUP_NAME:

    p = "invalid char in group name <%n>"; break;

  case ONIGERR_UNDEFINED_NAME_REFERENCE:

    p = "undefined name <%n> reference"; break;

  case ONIGERR_UNDEFINED_GROUP_REFERENCE:

    p = "undefined group <%n> reference"; break;

  case ONIGERR_MULTIPLEX_DEFINED_NAME:

    p = "multiplex defined name <%n>"; break;

  case ONIGERR_MULTIPLEX_DEFINITION_NAME_CALL:

    p = "multiplex definition name <%n> call"; break;

  case ONIGERR_NEVER_ENDING_RECURSION:

    p = "never ending recursion"; break;

  case ONIGERR_GROUP_NUMBER_OVER_FOR_CAPTURE_HISTORY:

    p = "group number is too big for capture history"; break;

  case ONIGERR_INVALID_CHAR_PROPERTY_NAME:

    p = "invalid character property name {%n}"; break;

  case ONIGERR_INVALID_IF_ELSE_SYNTAX:

    p = "invalid if-else syntax"; break;

  case ONIGERR_INVALID_ABSENT_GROUP_PATTERN:

    p = "invalid absent group pattern"; break;

  case ONIGERR_INVALID_ABSENT_GROUP_GENERATOR_PATTERN:

    p = "invalid absent group generator pattern"; break;

  case ONIGERR_INVALID_CALLOUT_PATTERN:

    p = "invalid callout pattern"; break;

  case ONIGERR_INVALID_CALLOUT_NAME:

    p = "invalid callout name"; break;

  case ONIGERR_UNDEFINED_CALLOUT_NAME:

    p = "undefined callout name"; break;

  case ONIGERR_INVALID_CALLOUT_BODY:

    p = "invalid callout body"; break;

  case ONIGERR_INVALID_CALLOUT_TAG_NAME:

    p = "invalid callout tag name"; break;

  case ONIGERR_INVALID_CALLOUT_ARG:

    p = "invalid callout arg"; break;

  case ONIGERR_NOT_SUPPORTED_ENCODING_COMBINATION:

    p = "not supported encoding combination"; break;

  case ONIGERR_INVALID_COMBINATION_OF_OPTIONS:

    p = "invalid combination of options"; break;

  case ONIGERR_LIBRARY_IS_NOT_INITIALIZED:

    p = "library is not initialized"; break;

  default:

    p = "undefined error code"; break;

  }

  return (UChar* )p;

}

static void sprint_byte(char* s, unsigned int v)

{

  xsnprintf(s, 3, "%02x", (v & 0377));

}

static void sprint_byte_with_x(char* s, unsigned int v)

{

  xsnprintf(s, 5, "\\x%02x", (v & 0377));

}

static int to_ascii(OnigEncoding enc, UChar *s, UChar *end,

		    UChar buf[], int buf_size, int *is_over)

{

  int len;

  UChar *p;

  OnigCodePoint code;

  if (ONIGENC_MBC_MINLEN(enc) > 1) {

    p = s;

    len = 0;

    while (p < end) {

      code = ONIGENC_MBC_TO_CODE(enc, p, end);

      if (code >= 0x80) {

        if (code > 0xffff && len + 10 <= buf_size) {

          sprint_byte_with_x((char*)(&(buf[len])), (unsigned int)(code >> 24));

          sprint_byte((char*)(&(buf[len+4])),      (unsigned int)(code >> 16));

          sprint_byte((char*)(&(buf[len+6])),      (unsigned int)(code >>  8));

          sprint_byte((char*)(&(buf[len+8])),      (unsigned int)code);

          len += 10;

        }

        else if (len + 6 <= buf_size) {

          sprint_byte_with_x((char*)(&(buf[len])), (unsigned int)(code >> 8));

          sprint_byte((char*)(&(buf[len+4])),      (unsigned int)code);

          len += 6;

        }

        else {

          break;

        }

      }

      else {

        buf[len++] = (UChar )code;

      }

      p += enclen(enc, p);

      if (len >= buf_size) break;

    }

    *is_over = ((p < end) ? 1 : 0);

  }

  else {

    len = MIN((int )(end - s), buf_size);

    xmemcpy(buf, s, (size_t )len);

    *is_over = ((buf_size < (end - s)) ? 1 : 0);

  }

  return len;

}

/* for ONIG_MAX_ERROR_MESSAGE_LEN */

#define MAX_ERROR_PAR_LEN   30

extern int

#ifdef HAVE_STDARG_PROTOTYPES

onig_error_code_to_str(UChar* s, int code, ...)

#else

onig_error_code_to_str(s, code, va_alist)

  UChar* s;

  int code;

  va_dcl 

#endif

{

  UChar *p, *q;

  OnigErrorInfo* einfo;

  int len, is_over;

  UChar parbuf[MAX_ERROR_PAR_LEN];

  va_list vargs;

  va_init_list(vargs, code);

  switch (code) {

  case ONIGERR_UNDEFINED_NAME_REFERENCE:

  case ONIGERR_UNDEFINED_GROUP_REFERENCE:

  case ONIGERR_MULTIPLEX_DEFINED_NAME:

  case ONIGERR_MULTIPLEX_DEFINITION_NAME_CALL:

  case ONIGERR_INVALID_GROUP_NAME:

  case ONIGERR_INVALID_CHAR_IN_GROUP_NAME:

  case ONIGERR_INVALID_CHAR_PROPERTY_NAME:

    einfo = va_arg(vargs, OnigErrorInfo*);

    len = to_ascii(einfo->enc, einfo->par, einfo->par_end,

                   parbuf, MAX_ERROR_PAR_LEN - 3, &is_over);

    q = onig_error_code_to_format(code);

    p = s;

    while (*q != '\0') {

      if (*q == '%') {

        q++;

        if (*q == 'n') { /* '%n': name */

          xmemcpy(p, parbuf, len);

          p += len;

          if (is_over != 0) {

            xmemcpy(p, "...", 3);

            p += 3;

          }

          q++;

        }

        else

          goto normal_char;

      }

      else {

      normal_char:

        *p++ = *q++;

      }

    }

    *p = '\0';

    len = (int )(p - s);

    break;

  default:

    q = onig_error_code_to_format(code);

    len = onigenc_str_bytelen_null(ONIG_ENCODING_ASCII, q);

    xmemcpy(s, q, len);

    s[len] = '\0';

    break;

  }

  va_end(vargs);

  return len;

}

void

#ifdef HAVE_STDARG_PROTOTYPES

onig_snprintf_with_pattern(UChar buf[], int bufsize, OnigEncoding enc,

                           UChar* pat, UChar* pat_end, const UChar *fmt, ...)

#else

onig_snprintf_with_pattern(buf, bufsize, enc, pat, pat_end, fmt, va_alist)

    UChar buf[];

    int bufsize;

    OnigEncoding enc;

    UChar* pat;

    UChar* pat_end;

    const UChar *fmt;

    va_dcl

#endif

{

  int n, need, len;

  UChar *p, *s, *bp;

  UChar bs[6];

  va_list args;

  va_init_list(args, fmt);

  n = xvsnprintf((char* )buf, bufsize, (const char* )fmt, args);

  va_end(args);

  need = (int )(pat_end - pat) * 4 + 4;

  if (n + need < bufsize) {

    xstrcat((char* )buf, ": /", bufsize);

    s = buf + onigenc_str_bytelen_null(ONIG_ENCODING_ASCII, buf);

    p = pat;

    while (p < pat_end) {

      if (ONIGENC_IS_MBC_HEAD(enc, p)) {

        len = enclen(enc, p);

        if (ONIGENC_MBC_MINLEN(enc) == 1) {

          while (len-- > 0) *s++ = *p++;

        }

        else { /* for UTF16/32 */

          int blen;

          while (len-- > 0) {

            sprint_byte_with_x((char* )bs, (unsigned int )(*p++));

            blen = onigenc_str_bytelen_null(ONIG_ENCODING_ASCII, bs);

            bp = bs;

            while (blen-- > 0) *s++ = *bp++;

          }

        }

      }

      else if (*p == '\\') {

        *s++ = *p++;

        len = enclen(enc, p);

        while (len-- > 0) *s++ = *p++;

      }

      else if (*p == '/') {

        *s++ = (unsigned char )'\\';

        *s++ = *p++;

      }

      else if (!ONIGENC_IS_CODE_PRINT(enc, *p) &&

               !ONIGENC_IS_CODE_SPACE(enc, *p)) {

        sprint_byte_with_x((char* )bs, (unsigned int )(*p++));

        len = onigenc_str_bytelen_null(ONIG_ENCODING_ASCII, bs);

        bp = bs;

        while (len-- > 0) *s++ = *bp++;

      }

      else {

        *s++ = *p++;

      }

    }

    *s++ = '/';

    *s   = '\0';

  }

}