readline/rlmbutil.h

   1 /* rlmbutil.h -- utility functions for multibyte characters. */
   2
   3 /* Copyright (C) 2001-2009 Free Software Foundation, Inc.
   4
   5    This file is part of the GNU Readline Library (Readline), a library
   6    for reading lines of text with interactive input and history editing.
   7
   8    Readline is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Readline is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #if !defined (_RL_MBUTIL_H_)
  23 #define _RL_MBUTIL_H_
  24
  25 #include "rlstdc.h"
  26
  27 /************************************************/
  28 /* check multibyte capability for I18N code     */
  29 /************************************************/
  30
  31 /* For platforms which support the ISO C amendement 1 functionality we
  32    support user defined character classes.  */
  33    /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */
  34 #if defined (HAVE_WCTYPE_H) && defined (HAVE_WCHAR_H) && defined (HAVE_LOCALE_H)
  35 #  include <wchar.h>
  36 #  include <wctype.h>
  37 #  if defined (HAVE_ISWCTYPE) && \
  38       defined (HAVE_ISWLOWER) && \
  39       defined (HAVE_ISWUPPER) && \
  40       defined (HAVE_MBSRTOWCS) && \
  41       defined (HAVE_MBRTOWC) && \
  42       defined (HAVE_MBRLEN) && \
  43       defined (HAVE_TOWLOWER) && \
  44       defined (HAVE_TOWUPPER) && \
  45       defined (HAVE_WCHAR_T) && \
  46       defined (HAVE_WCWIDTH)
  47      /* system is supposed to support XPG5 */
  48 #    define HANDLE_MULTIBYTE      1
  49 #  endif
  50 #endif
  51
  52 /* If we don't want multibyte chars even on a system that supports them, let
  53    the configuring user turn multibyte support off. */
  54 #if defined (NO_MULTIBYTE_SUPPORT)
  55 #  undef HANDLE_MULTIBYTE
  56 #endif
  57
  58 /* Some systems, like BeOS, have multibyte encodings but lack mbstate_t.  */
  59 #if HANDLE_MULTIBYTE && !defined (HAVE_MBSTATE_T)
  60 #  define wcsrtombs(dest, src, len, ps) (wcsrtombs) (dest, src, len, 0)
  61 #  define mbsrtowcs(dest, src, len, ps) (mbsrtowcs) (dest, src, len, 0)
  62 #  define wcrtomb(s, wc, ps) (wcrtomb) (s, wc, 0)
  63 #  define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
  64 #  define mbrlen(s, n, ps) (mbrlen) (s, n, 0)
  65 #  define mbstate_t int
  66 #endif
  67
  68 /* Make sure MB_LEN_MAX is at least 16 on systems that claim to be able to
  69    handle multibyte chars (some systems define MB_LEN_MAX as 1) */
  70 #ifdef HANDLE_MULTIBYTE
  71 #  include <limits.h>
  72 #  if defined(MB_LEN_MAX) && (MB_LEN_MAX < 16)
  73 #    undef MB_LEN_MAX
  74 #  endif
  75 #  if !defined (MB_LEN_MAX)
  76 #    define MB_LEN_MAX 16
  77 #  endif
  78 #endif
  79
  80 /************************************************/
  81 /* end of multibyte capability checks for I18N  */
  82 /************************************************/
  83
  84 /*
  85  * Flags for _rl_find_prev_mbchar and _rl_find_next_mbchar:
  86  *
  87  * MB_FIND_ANY          find any multibyte character
  88  * MB_FIND_NONZERO      find a non-zero-width multibyte character
  89  */
  90
  91 #define MB_FIND_ANY     0x00
  92 #define MB_FIND_NONZERO 0x01
  93
  94 extern int _rl_find_prev_mbchar PARAMS((char *, int, int));
  95 extern int _rl_find_next_mbchar PARAMS((char *, int, int, int));
  96
  97 #ifdef HANDLE_MULTIBYTE
  98
  99 extern int _rl_compare_chars PARAMS((char *, int, mbstate_t *, char *, int, mbstate_t *));
 100 extern int _rl_get_char_len PARAMS((char *, mbstate_t *));
 101 extern int _rl_adjust_point PARAMS((char *, int, mbstate_t *));
 102
 103 extern int _rl_read_mbchar PARAMS((char *, int));
 104 extern int _rl_read_mbstring PARAMS((int, char *, int));
 105
 106 extern int _rl_is_mbchar_matched PARAMS((char *, int, int, char *, int));
 107
 108 extern wchar_t _rl_char_value PARAMS((char *, int));
 109 extern int _rl_walphabetic PARAMS((wchar_t));
 110
 111 #define _rl_to_wupper(wc)       (iswlower (wc) ? towupper (wc) : (wc))
 112 #define _rl_to_wlower(wc)       (iswupper (wc) ? towlower (wc) : (wc))
 113
 114 #define MB_NEXTCHAR(b,s,c,f) \
 115         ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
 116                 ? _rl_find_next_mbchar ((b), (s), (c), (f)) \
 117                 : ((s) + (c)))
 118 #define MB_PREVCHAR(b,s,f) \
 119         ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) \
 120                 ? _rl_find_prev_mbchar ((b), (s), (f)) \
 121                 : ((s) - 1))
 122
 123 #define MB_INVALIDCH(x)         ((x) == (size_t)-1 || (x) == (size_t)-2)
 124 #define MB_NULLWCH(x)           ((x) == 0)
 125
 126 #else /* !HANDLE_MULTIBYTE */
 127
 128 #undef MB_LEN_MAX
 129 #undef MB_CUR_MAX
 130
 131 #define MB_LEN_MAX      1
 132 #define MB_CUR_MAX      1
 133
 134 #define _rl_find_prev_mbchar(b, i, f)           (((i) == 0) ? (i) : ((i) - 1))
 135 #define _rl_find_next_mbchar(b, i1, i2, f)      ((i1) + (i2))
 136
 137 #define _rl_char_value(buf,ind) ((buf)[(ind)])
 138
 139 #define _rl_walphabetic(c)      (rl_alphabetic (c))
 140
 141 #define _rl_to_wupper(c)        (_rl_to_upper (c))
 142 #define _rl_to_wlower(c)        (_rl_to_lower (c))
 143
 144 #define MB_NEXTCHAR(b,s,c,f)    ((s) + (c))
 145 #define MB_PREVCHAR(b,s,f)      ((s) - 1)
 146
 147 #define MB_INVALIDCH(x)         (0)
 148 #define MB_NULLWCH(x)           (0)
 149
 150 #endif /* !HANDLE_MULTIBYTE */
 151
 152 extern int rl_byte_oriented;
 153
 154 #endif /* _RL_MBUTIL_H_ */