readline/rlmbutil.h

   1 /* rlmbutil.h -- utility functions for multibyte characters. */
   2
   3 /* Copyright (C) 2001, 2003 Free Software Foundation, Inc.
   4
   5    This file is part of the GNU Readline Library, a library for
   6    reading lines of text with interactive input and history editing.
   7
   8    The GNU Readline Library is free software; you can redistribute it
   9    and/or modify it under the terms of the GNU General Public License
  10    as published by the Free Software Foundation; either version 2, or
  11    (at your option) any later version.
  12
  13    The GNU Readline Library is distributed in the hope that it will be
  14    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    The GNU General Public License is often shipped with GNU software, and
  19    is generally kept in a file called COPYING or LICENSE.  If you do not
  20    have a copy of the license, write to the Free Software Foundation,
  21    59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  22
  23 #if !defined (_RL_MBUTIL_H_)
  24 #define _RL_MBUTIL_H_
  25
  26 #include "rlstdc.h"
  27
  28 /************************************************/
  29 /* check multibyte capability for I18N code     */
  30 /************************************************/
  31
  32 /* For platforms which support the ISO C amendement 1 functionality we
  33    support user defined character classes.
  34
  35    Some platforms have the multibyte functions such as mbsrtowcs but
  36    are lacking the multitype type mbstate_t.  BeOS (unknown version)
  37    and HP/UX 11.23 without _XOPEN_SOURCE=500 are like this.
  38
  39    We really need mbstate_t type to operate properly.  For example, see
  40    compute_lcd_of_matches, where two mbstate_t's are active at the same
  41    time.  So we require both the functions and the mbstate_t type in
  42    order to enable multibyte support.  */
  43
  44    /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */
  45 #if defined (HAVE_WCTYPE_H) && defined (HAVE_WCHAR_H)
  46 #  include <wchar.h>
  47 #  include <wctype.h>
  48 #  if defined (HAVE_MBSTATE_T) && defined (HAVE_MBSRTOWCS) && defined (HAVE_MBRTOWC) && defined (HAVE_MBRLEN) && defined (HAVE_WCWIDTH)
  49      /* system is supposed to support XPG5 */
  50 #    define HANDLE_MULTIBYTE      1
  51 #  endif
  52 #endif
  53
  54 /* If we don't want multibyte chars even on a system that supports them, let
  55    the configuring user turn multibyte support off. */
  56 #if defined (NO_MULTIBYTE_SUPPORT)
  57 #  undef HANDLE_MULTIBYTE
  58 #endif
  59
  60 /* Some systems, like BeOS, have multibyte encodings but lack mbstate_t.  */
  61 #if HANDLE_MULTIBYTE && !defined (HAVE_MBSTATE_T)
  62 #  define wcsrtombs(dest, src, len, ps) (wcsrtombs) (dest, src, len, 0)
  63 #  define mbsrtowcs(dest, src, len, ps) (mbsrtowcs) (dest, src, len, 0)
  64 #  define wcrtomb(s, wc, ps) (wcrtomb) (s, wc, 0)
  65 #  define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
  66 #  define mbrlen(s, n, ps) (mbrlen) (s, n, 0)
  67 #  define mbstate_t int
  68 #endif
  69
  70 /* Make sure MB_LEN_MAX is at least 16 on systems that claim to be able to
  71    handle multibyte chars (some systems define MB_LEN_MAX as 1) */
  72 #ifdef HANDLE_MULTIBYTE
  73 #  include <limits.h>
  74 #  if defined(MB_LEN_MAX) && (MB_LEN_MAX < 16)
  75 #    undef MB_LEN_MAX
  76 #  endif
  77 #  if !defined (MB_LEN_MAX)
  78 #    define MB_LEN_MAX 16
  79 #  endif
  80 #endif
  81
  82 /************************************************/
  83 /* end of multibyte capability checks for I18N  */
  84 /************************************************/
  85
  86 /*
  87  * Flags for _rl_find_prev_mbchar and _rl_find_next_mbchar:
  88  *
  89  * MB_FIND_ANY          find any multibyte character
  90  * MB_FIND_NONZERO      find a non-zero-width multibyte character
  91  */
  92
  93 #define MB_FIND_ANY     0x00
  94 #define MB_FIND_NONZERO 0x01
  95
  96 extern int _rl_find_prev_mbchar PARAMS((char *, int, int));
  97 extern int _rl_find_next_mbchar PARAMS((char *, int, int, int));
  98
  99 #ifdef HANDLE_MULTIBYTE
 100
 101 extern int _rl_compare_chars PARAMS((char *, int, mbstate_t *, char *, int, mbstate_t *));
 102 extern int _rl_get_char_len PARAMS((char *, mbstate_t *));
 103 extern int _rl_adjust_point PARAMS((char *, int, mbstate_t *));
 104
 105 extern int _rl_read_mbchar PARAMS((char *, int));
 106 extern int _rl_read_mbstring PARAMS((int, char *, int));
 107
 108 extern int _rl_is_mbchar_matched PARAMS((char *, int, int, char *, int));
 109
 110 extern wchar_t _rl_char_value PARAMS((char *, int));
 111 extern int _rl_walphabetic PARAMS((wchar_t));
 112
 113 #define _rl_to_wupper(wc)       (iswlower (wc) ? towupper (wc) : (wc))
 114 #define _rl_to_wlower(wc)       (iswupper (wc) ? towlower (wc) : (wc))
 115
 116 #define MB_NEXTCHAR(b,s,c,f) \
 117         ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
 118                 ? _rl_find_next_mbchar ((b), (s), (c), (f)) \
 119                 : ((s) + (c)))
 120 #define MB_PREVCHAR(b,s,f) \
 121         ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
 122                 ? _rl_find_prev_mbchar ((b), (s), (f)) \
 123                 : ((s) - 1))
 124
 125 #define MB_INVALIDCH(x)         ((x) == (size_t)-1 || (x) == (size_t)-2)
 126 #define MB_NULLWCH(x)           ((x) == 0)
 127
 128 #else /* !HANDLE_MULTIBYTE */
 129
 130 #undef MB_LEN_MAX
 131 #undef MB_CUR_MAX
 132
 133 #define MB_LEN_MAX      1
 134 #define MB_CUR_MAX      1
 135
 136 #define _rl_find_prev_mbchar(b, i, f)           (((i) == 0) ? (i) : ((i) - 1))
 137 #define _rl_find_next_mbchar(b, i1, i2, f)      ((i1) + (i2))
 138
 139 #define _rl_char_value(buf,ind) ((buf)[(ind)])
 140
 141 #define _rl_walphabetic(c)      (rl_alphabetic (c))
 142
 143 #define _rl_to_wupper(c)        (_rl_to_upper (c))
 144 #define _rl_to_wlower(c)        (_rl_to_lower (c))
 145
 146 #define MB_NEXTCHAR(b,s,c,f)    ((s) + (c))
 147 #define MB_PREVCHAR(b,s,f)      ((s) - 1)
 148
 149 #define MB_INVALIDCH(x)         (0)
 150 #define MB_NULLWCH(x)           (0)
 151
 152 #endif /* !HANDLE_MULTIBYTE */
 153
 154 extern int rl_byte_oriented;
 155
 156 #endif /* _RL_MBUTIL_H_ */