/* Multibyte character data type.
   Copyright (C) 2001, 2005-2007, 2009-2018 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>.  */

/* A multibyte character is a short subsequence of a char* string,
   representing a single wide character.

   We use multibyte characters instead of wide characters because of
   the following goals:
   1) correct multibyte handling, i.e. operate according to the LC_CTYPE
      locale,
   2) ease of maintenance, i.e. the maintainer needs not know all details
      of the ISO C 99 standard,
   3) don't fail grossly if the input is not in the encoding set by the
      locale, because often different encodings are in use in the same
      countries (ISO-8859-1/UTF-8, EUC-JP/Shift_JIS, ...),
   4) fast in the case of ASCII characters,
   5) portability, i.e. don't make unportable assumptions about wchar_t.

   Multibyte characters are only accessed through the mb* macros.

   mb_ptr (mbc)
     return a pointer to the beginning of the multibyte sequence.

   mb_len (mbc)
     returns the number of bytes occupied by the multibyte sequence.
     Always > 0.

   mb_iseq (mbc, sc)
     returns true if mbc is the standard ASCII character sc.

   mb_isnul (mbc)
     returns true if mbc is the nul character.

   mb_cmp (mbc1, mbc2)
     returns a positive, zero, or negative value depending on whether mbc1
     sorts after, same or before mbc2.

   mb_casecmp (mbc1, mbc2)
     returns a positive, zero, or negative value depending on whether mbc1
     sorts after, same or before mbc2, modulo upper/lowercase conversion.

   mb_equal (mbc1, mbc2)
     returns true if mbc1 and mbc2 are equal.

   mb_caseequal (mbc1, mbc2)
     returns true if mbc1 and mbc2 are equal modulo upper/lowercase conversion.

   mb_isalnum (mbc)
     returns true if mbc is alphanumeric.

   mb_isalpha (mbc)
     returns true if mbc is alphabetic.

   mb_isascii(mbc)
     returns true if mbc is plain ASCII.

   mb_isblank (mbc)
     returns true if mbc is a blank.

   mb_iscntrl (mbc)
     returns true if mbc is a control character.

   mb_isdigit (mbc)
     returns true if mbc is a decimal digit.

   mb_isgraph (mbc)
     returns true if mbc is a graphic character.

   mb_islower (mbc)
     returns true if mbc is lowercase.

   mb_isprint (mbc)
     returns true if mbc is a printable character.

   mb_ispunct (mbc)
     returns true if mbc is a punctuation character.

   mb_isspace (mbc)
     returns true if mbc is a space character.

   mb_isupper (mbc)
     returns true if mbc is uppercase.

   mb_isxdigit (mbc)
     returns true if mbc is a hexadecimal digit.

   mb_width (mbc)
     returns the number of columns on the output device occupied by mbc.
     Always >= 0.

   mb_putc (mbc, stream)
     outputs mbc on stream, a byte oriented FILE stream opened for output.

   mb_setascii (&mbc, sc)
     assigns the standard ASCII character sc to mbc.

   mb_copy (&destmbc, &srcmbc)
     copies srcmbc to destmbc.

   Here are the function prototypes of the macros.

   extern const char *  mb_ptr (const mbchar_t mbc);
   extern size_t        mb_len (const mbchar_t mbc);
   extern bool          mb_iseq (const mbchar_t mbc, char sc);
   extern bool          mb_isnul (const mbchar_t mbc);
   extern int           mb_cmp (const mbchar_t mbc1, const mbchar_t mbc2);
   extern int           mb_casecmp (const mbchar_t mbc1, const mbchar_t mbc2);
   extern bool          mb_equal (const mbchar_t mbc1, const mbchar_t mbc2);
   extern bool          mb_caseequal (const mbchar_t mbc1, const mbchar_t mbc2);
   extern bool          mb_isalnum (const mbchar_t mbc);
   extern bool          mb_isalpha (const mbchar_t mbc);
   extern bool          mb_isascii (const mbchar_t mbc);
   extern bool          mb_isblank (const mbchar_t mbc);
   extern bool          mb_iscntrl (const mbchar_t mbc);
   extern bool          mb_isdigit (const mbchar_t mbc);
   extern bool          mb_isgraph (const mbchar_t mbc);
   extern bool          mb_islower (const mbchar_t mbc);
   extern bool          mb_isprint (const mbchar_t mbc);
   extern bool          mb_ispunct (const mbchar_t mbc);
   extern bool          mb_isspace (const mbchar_t mbc);
   extern bool          mb_isupper (const mbchar_t mbc);
   extern bool          mb_isxdigit (const mbchar_t mbc);
   extern int           mb_width (const mbchar_t mbc);
   extern void          mb_putc (const mbchar_t mbc, FILE *stream);
   extern void          mb_setascii (mbchar_t *new, char sc);
   extern void          mb_copy (mbchar_t *new, const mbchar_t *old);
 */

#ifndef _MBCHAR_H
#define _MBCHAR_H 1

#include <stdbool.h>
#include <string.h>

/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
   <wchar.h>.
   BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
   <wchar.h>.  */
#include <stdio.h>
#include <time.h>
#include <wchar.h>
#include <wctype.h>

#ifndef _GL_INLINE_HEADER_BEGIN
 #error "Please include config.h first."
#endif
_GL_INLINE_HEADER_BEGIN
#ifndef MBCHAR_INLINE
# define MBCHAR_INLINE _GL_INLINE
#endif

#define MBCHAR_BUF_SIZE 24

struct mbchar
{
  const char *ptr;      /* pointer to current character */
  size_t bytes;         /* number of bytes of current character, > 0 */
  bool wc_valid;        /* true if wc is a valid wide character */
  wchar_t wc;           /* if wc_valid: the current character */
  char buf[MBCHAR_BUF_SIZE]; /* room for the bytes, used for file input only */
};

/* EOF (not a real character) is represented with bytes = 0 and
   wc_valid = false.  */

typedef struct mbchar mbchar_t;

/* Access the current character.  */
#define mb_ptr(mbc) ((mbc).ptr)
#define mb_len(mbc) ((mbc).bytes)

/* Comparison of characters.  */
#define mb_iseq(mbc, sc) ((mbc).wc_valid && (mbc).wc == (sc))
#define mb_isnul(mbc) ((mbc).wc_valid && (mbc).wc == 0)
#define mb_cmp(mbc1, mbc2) \
  ((mbc1).wc_valid                                                      \
   ? ((mbc2).wc_valid                                                   \
      ? (int) (mbc1).wc - (int) (mbc2).wc                               \
      : -1)                                                             \
   : ((mbc2).wc_valid                                                   \
      ? 1                                                               \
      : (mbc1).bytes == (mbc2).bytes                                    \
        ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes)                 \
        : (mbc1).bytes < (mbc2).bytes                                   \
          ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
          : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
#define mb_casecmp(mbc1, mbc2) \
  ((mbc1).wc_valid                                                      \
   ? ((mbc2).wc_valid                                                   \
      ? (int) towlower ((mbc1).wc) - (int) towlower ((mbc2).wc)         \
      : -1)                                                             \
   : ((mbc2).wc_valid                                                   \
      ? 1                                                               \
      : (mbc1).bytes == (mbc2).bytes                                    \
        ? memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes)                 \
        : (mbc1).bytes < (mbc2).bytes                                   \
          ? (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) > 0 ? 1 : -1) \
          : (memcmp ((mbc1).ptr, (mbc2).ptr, (mbc2).bytes) >= 0 ? 1 : -1)))
#define mb_equal(mbc1, mbc2) \
  ((mbc1).wc_valid && (mbc2).wc_valid                                   \
   ? (mbc1).wc == (mbc2).wc                                             \
   : (mbc1).bytes == (mbc2).bytes                                       \
     && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)
#define mb_caseequal(mbc1, mbc2) \
  ((mbc1).wc_valid && (mbc2).wc_valid                                   \
   ? towlower ((mbc1).wc) == towlower ((mbc2).wc)                       \
   : (mbc1).bytes == (mbc2).bytes                                       \
     && memcmp ((mbc1).ptr, (mbc2).ptr, (mbc1).bytes) == 0)

/* <ctype.h>, <wctype.h> classification.  */
#define mb_isascii(mbc) \
  ((mbc).wc_valid && (mbc).wc >= 0 && (mbc).wc <= 127)
#define mb_isalnum(mbc) ((mbc).wc_valid && iswalnum ((mbc).wc))
#define mb_isalpha(mbc) ((mbc).wc_valid && iswalpha ((mbc).wc))
#define mb_isblank(mbc) ((mbc).wc_valid && iswblank ((mbc).wc))
#define mb_iscntrl(mbc) ((mbc).wc_valid && iswcntrl ((mbc).wc))
#define mb_isdigit(mbc) ((mbc).wc_valid && iswdigit ((mbc).wc))
#define mb_isgraph(mbc) ((mbc).wc_valid && iswgraph ((mbc).wc))
#define mb_islower(mbc) ((mbc).wc_valid && iswlower ((mbc).wc))
#define mb_isprint(mbc) ((mbc).wc_valid && iswprint ((mbc).wc))
#define mb_ispunct(mbc) ((mbc).wc_valid && iswpunct ((mbc).wc))
#define mb_isspace(mbc) ((mbc).wc_valid && iswspace ((mbc).wc))
#define mb_isupper(mbc) ((mbc).wc_valid && iswupper ((mbc).wc))
#define mb_isxdigit(mbc) ((mbc).wc_valid && iswxdigit ((mbc).wc))

/* Extra <wchar.h> function.  */

/* Unprintable characters appear as a small box of width 1.  */
#define MB_UNPRINTABLE_WIDTH 1

MBCHAR_INLINE int
mb_width_aux (wint_t wc)
{
  int w = wcwidth (wc);
  /* For unprintable characters, arbitrarily return 0 for control characters
     and MB_UNPRINTABLE_WIDTH otherwise.  */
  return (w >= 0 ? w : iswcntrl (wc) ? 0 : MB_UNPRINTABLE_WIDTH);
}

#define mb_width(mbc) \
  ((mbc).wc_valid ? mb_width_aux ((mbc).wc) : MB_UNPRINTABLE_WIDTH)

/* Output.  */
#define mb_putc(mbc, stream)  fwrite ((mbc).ptr, 1, (mbc).bytes, (stream))

/* Assignment.  */
#define mb_setascii(mbc, sc) \
  ((mbc)->ptr = (mbc)->buf, (mbc)->bytes = 1, (mbc)->wc_valid = 1, \
   (mbc)->wc = (mbc)->buf[0] = (sc))

/* Copying a character.  */
MBCHAR_INLINE void
mb_copy (mbchar_t *new_mbc, const mbchar_t *old_mbc)
{
  if (old_mbc->ptr == &old_mbc->buf[0])
    {
      memcpy (&new_mbc->buf[0], &old_mbc->buf[0], old_mbc->bytes);
      new_mbc->ptr = &new_mbc->buf[0];
    }
  else
    new_mbc->ptr = old_mbc->ptr;
  new_mbc->bytes = old_mbc->bytes;
  if ((new_mbc->wc_valid = old_mbc->wc_valid))
    new_mbc->wc = old_mbc->wc;
}


/* is_basic(c) tests whether the single-byte character c is in the
   ISO C "basic character set".
   This is a convenience function, and is in this file only to share code
   between mbiter_multi.h and mbfile_multi.h.  */
#if (' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
    && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
    && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
    && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
    && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
    && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
    && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
    && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
    && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
    && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
    && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
    && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
    && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
    && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
    && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
    && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
    && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
    && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
    && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
    && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
    && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
    && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
    && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126)
/* The character set is ISO-646, not EBCDIC. */
# define IS_BASIC_ASCII 1

extern const unsigned int is_basic_table[];

MBCHAR_INLINE bool
is_basic (char c)
{
  return (is_basic_table [(unsigned char) c >> 5] >> ((unsigned char) c & 31))
         & 1;
}

#else

MBCHAR_INLINE bool
is_basic (char c)
{
  switch (c)
    {
    case '\t': case '\v': case '\f':
    case ' ': case '!': case '"': case '#': case '%':
    case '&': case '\'': case '(': case ')': case '*':
    case '+': case ',': case '-': case '.': case '/':
    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
    case ':': case ';': case '<': case '=': case '>':
    case '?':
    case 'A': case 'B': case 'C': case 'D': case 'E':
    case 'F': case 'G': case 'H': case 'I': case 'J':
    case 'K': case 'L': case 'M': case 'N': case 'O':
    case 'P': case 'Q': case 'R': case 'S': case 'T':
    case 'U': case 'V': case 'W': case 'X': case 'Y':
    case 'Z':
    case '[': case '\\': case ']': case '^': case '_':
    case 'a': case 'b': case 'c': case 'd': case 'e':
    case 'f': case 'g': case 'h': case 'i': case 'j':
    case 'k': case 'l': case 'm': case 'n': case 'o':
    case 'p': case 'q': case 'r': case 's': case 't':
    case 'u': case 'v': case 'w': case 'x': case 'y':
    case 'z': case '{': case '|': case '}': case '~':
      return 1;
    default:
      return 0;
    }
}

#endif

_GL_INLINE_HEADER_END

#endif /* _MBCHAR_H */
