335 lines
9.3 KiB
C
335 lines
9.3 KiB
C
/* Multibyte Character Functions.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* Note regarding cross compilation:
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In general, translation of multibyte characters to wide characters can
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only work in a native compiler since the translation function (mbtowc)
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needs to know about both the source and target character encoding. However,
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this particular implementation for JIS, SJIS and EUCJP source characters
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will work for any compiler with a newlib target. Other targets may also
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work provided that their wchar_t implementation is 2 bytes and the encoding
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leaves the source character values unchanged (except for removing the
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state shifting markers). */
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#include "config.h"
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#ifdef MULTIBYTE_CHARS
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#include "system.h"
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#include "mbchar.h"
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#include <locale.h>
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typedef enum {ESCAPE, DOLLAR, BRACKET, AT, B, J, NUL, JIS_CHAR, OTHER,
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JIS_C_NUM} JIS_CHAR_TYPE;
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typedef enum {ASCII, A_ESC, A_ESC_DL, JIS, JIS_1, JIS_2, J_ESC, J_ESC_BR,
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J2_ESC, J2_ESC_BR, INV, JIS_S_NUM} JIS_STATE;
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typedef enum {COPYA, COPYJ, COPYJ2, MAKE_A, MAKE_J, NOOP,
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EMPTY, ERROR} JIS_ACTION;
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/* State/action tables for processing JIS encoding:
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Where possible, switches to JIS are grouped with proceding JIS characters
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and switches to ASCII are grouped with preceding JIS characters.
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Thus, maximum returned length is:
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2 (switch to JIS) + 2 (JIS characters) + 2 (switch back to ASCII) = 6. */
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static JIS_STATE JIS_state_table[JIS_S_NUM][JIS_C_NUM] = {
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/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTH*/
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/*ASCII*/ { A_ESC, ASCII, ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
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/*A_ESC*/ { ASCII, A_ESC_DL,ASCII, ASCII, ASCII, ASCII, ASCII,ASCII,ASCII},
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/*A_ESC_DL*/{ ASCII, ASCII, ASCII, JIS, JIS, ASCII, ASCII,ASCII,ASCII},
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/*JIS*/ { J_ESC, JIS_1, JIS_1, JIS_1, JIS_1, JIS_1, INV, JIS_1,INV },
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/*JIS_1*/ { INV, JIS_2, JIS_2, JIS_2, JIS_2, JIS_2, INV, JIS_2,INV },
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/*JIS_2*/ { J2_ESC,JIS, JIS, JIS, JIS, JIS, INV, JIS, JIS },
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/*J_ESC*/ { INV, INV, J_ESC_BR, INV, INV, INV, INV, INV, INV },
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/*J_ESC_BR*/{ INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
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/*J2_ESC*/ { INV, INV, J2_ESC_BR,INV, INV, INV, INV, INV, INV },
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/*J2_ESC_BR*/{INV, INV, INV, INV, ASCII, ASCII, INV, INV, INV },
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};
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static JIS_ACTION JIS_action_table[JIS_S_NUM][JIS_C_NUM] = {
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/* ESCAPE DOLLAR BRACKET AT B J NUL JIS_CHAR OTH */
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/*ASCII */ {NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, EMPTY, COPYA, COPYA},
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/*A_ESC */ {COPYA, NOOP, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA, COPYA},
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/*A_ESC_DL */{COPYA, COPYA, COPYA, MAKE_J, MAKE_J, COPYA, COPYA, COPYA, COPYA},
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/*JIS */ {NOOP, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR},
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/*JIS_1 */ {ERROR, NOOP, NOOP, NOOP, NOOP, NOOP, ERROR, NOOP, ERROR},
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/*JIS_2 */ {NOOP, COPYJ2,COPYJ2,COPYJ2, COPYJ2, COPYJ2,ERROR, COPYJ2,COPYJ2},
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/*J_ESC */ {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR},
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/*J_ESC_BR */{ERROR, ERROR, ERROR, ERROR, NOOP, NOOP, ERROR, ERROR, ERROR},
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/*J2_ESC */ {ERROR, ERROR, NOOP, ERROR, ERROR, ERROR, ERROR, ERROR, ERROR},
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/*J2_ESC_BR*/{ERROR, ERROR, ERROR, ERROR, COPYJ, COPYJ, ERROR, ERROR, ERROR},
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};
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const char *literal_codeset = NULL;
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/* Store into *PWC (if PWC is not null) the wide character
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corresponding to the multibyte character at the start of the
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buffer S of size N. Return the number of bytes in the multibyte
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character. Return -1 if the bytes do not form a valid character,
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or 0 if S is null or points to a null byte.
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This function behaves like the Standard C function mbtowc, except
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it treats locale names of the form "C-..." specially. */
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int
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local_mbtowc (pwc, s, n)
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wchar_t *pwc;
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const char *s;
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size_t n;
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{
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static JIS_STATE save_state = ASCII;
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JIS_STATE curr_state = save_state;
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const unsigned char *t = (const unsigned char *) s;
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if (s != NULL && n == 0)
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return -1;
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if (literal_codeset == NULL || strlen (literal_codeset) <= 1)
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/* This must be the "C" locale or unknown locale -- fall thru */
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;
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else if (! strcmp (literal_codeset, "C-SJIS"))
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{
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int char1;
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if (s == NULL)
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/* Not state-dependent. */
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return 0;
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char1 = *t;
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if (ISSJIS1 (char1))
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{
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int char2 = t[1];
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if (n <= 1)
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return -1;
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if (ISSJIS2 (char2))
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{
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if (pwc != NULL)
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*pwc = (((wchar_t) *t) << 8) + (wchar_t) (*(t + 1));
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return 2;
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}
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return -1;
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}
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if (pwc != NULL)
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*pwc = (wchar_t) *t;
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if (*t == '\0')
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return 0;
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return 1;
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}
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else if (! strcmp (literal_codeset, "C-EUCJP"))
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{
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int char1;
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if (s == NULL)
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/* Not state-dependent. */
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return 0;
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char1 = *t;
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if (ISEUCJP (char1))
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{
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int char2 = t[1];
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if (n <= 1)
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return -1;
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if (ISEUCJP (char2))
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{
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if (pwc != NULL)
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*pwc = (((wchar_t) *t) << 8) + (wchar_t) (*(t + 1));
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return 2;
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}
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return -1;
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}
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if (pwc != NULL)
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*pwc = (wchar_t) *t;
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if (*t == '\0')
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return 0;
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return 1;
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}
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else if (! strcmp (literal_codeset, "C-JIS"))
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{
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JIS_ACTION action;
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JIS_CHAR_TYPE ch;
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const unsigned char *ptr;
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size_t i, curr_ch;
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if (s == NULL)
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{
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save_state = ASCII;
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/* State-dependent. */
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return 1;
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}
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ptr = t;
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for (i = 0; i < n; i++)
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{
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curr_ch = t[i];
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switch (curr_ch)
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{
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case JIS_ESC_CHAR:
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ch = ESCAPE;
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break;
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case '$':
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ch = DOLLAR;
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break;
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case '@':
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ch = AT;
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break;
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case '(':
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ch = BRACKET;
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break;
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case 'B':
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ch = B;
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break;
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case 'J':
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ch = J;
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break;
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case '\0':
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ch = NUL;
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break;
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default:
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if (ISJIS (curr_ch))
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ch = JIS_CHAR;
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else
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ch = OTHER;
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}
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action = JIS_action_table[curr_state][ch];
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curr_state = JIS_state_table[curr_state][ch];
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switch (action)
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{
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case NOOP:
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break;
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case EMPTY:
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if (pwc != NULL)
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*pwc = (wchar_t) 0;
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save_state = curr_state;
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return i;
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case COPYA:
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if (pwc != NULL)
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*pwc = (wchar_t) *ptr;
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save_state = curr_state;
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return i + 1;
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case COPYJ:
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if (pwc != NULL)
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*pwc = (((wchar_t) *ptr) << 8) + (wchar_t) (*(ptr + 1));
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save_state = curr_state;
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return i + 1;
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case COPYJ2:
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if (pwc != NULL)
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*pwc = (((wchar_t) *ptr) << 8) + (wchar_t) (*(ptr + 1));
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save_state = curr_state;
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return ptr - t + 2;
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case MAKE_A:
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case MAKE_J:
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ptr = (const unsigned char *) (t + i + 1);
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break;
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case ERROR:
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default:
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return -1;
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}
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}
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/* More than n bytes needed. */
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return -1;
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}
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#ifdef CROSS_COMPILE
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if (s == NULL)
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/* Not state-dependent. */
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return 0;
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if (pwc != NULL)
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*pwc = *s;
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return 1;
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#else
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/* This must be the "C" locale or unknown locale. */
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return mbtowc (pwc, s, n);
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#endif
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}
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/* Return the number of bytes in the multibyte character at the start
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of the buffer S of size N. Return -1 if the bytes do not form a
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valid character, or 0 if S is null or points to a null byte.
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This function behaves like the Standard C function mblen, except
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it treats locale names of the form "C-..." specially. */
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int
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local_mblen (s, n)
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const char *s;
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size_t n;
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{
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return local_mbtowc (NULL, s, n);
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}
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/* Return the maximum mumber of bytes in a multibyte character.
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This function returns the same value as the Standard C macro MB_CUR_MAX,
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except it treats locale names of the form "C-..." specially. */
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int
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local_mb_cur_max ()
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{
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if (literal_codeset == NULL || strlen (literal_codeset) <= 1)
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;
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else if (! strcmp (literal_codeset, "C-SJIS"))
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return 2;
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else if (! strcmp (literal_codeset, "C-EUCJP"))
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return 2;
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else if (! strcmp (literal_codeset, "C-JIS"))
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return 8; /* 3 + 2 + 3 */
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#ifdef CROSS_COMPILE
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return 1;
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#else
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if (MB_CUR_MAX > 0)
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return MB_CUR_MAX;
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return 1; /* default */
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#endif
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}
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#else /* MULTIBYTE_CHARS */
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extern int dummy; /* silence 'ANSI C forbids an empty source file' warning */
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#endif /* MULTIBYTE_CHARS */
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