c4ef73e2998394d6195ef035cc107f93664a2315
[kopensolaris-gnu/glibc.git] / iconvdata / iso-2022-kr.c
1 /* Conversion module for ISO-2022-KR.
2    Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
5
6    The GNU C Library is free software; you can redistribute it and/or
7    modify it under the terms of the GNU Library General Public License as
8    published by the Free Software Foundation; either version 2 of the
9    License, or (at your option) any later version.
10
11    The GNU C Library is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14    Library General Public License for more details.
15
16    You should have received a copy of the GNU Library General Public
17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19    Boston, MA 02111-1307, USA.  */
20
21 #include <gconv.h>
22 #include <stdint.h>
23 #include <string.h>
24 #include "ksc5601.h"
25
26 #include <assert.h>
27
28 /* This makes obvious what everybody knows: 0x1b is the Esc character.  */
29 #define ESC     0x1b
30
31 /* The shift sequences for this charset (it does not use ESC).  */
32 #define SI      0x0f
33 #define SO      0x0e
34
35 /* Definitions used in the body of the `gconv' function.  */
36 #define CHARSET_NAME            "ISO-2022-KR//"
37 #define DEFINE_INIT             1
38 #define DEFINE_FINI             1
39 #define FROM_LOOP               from_iso2022kr_loop
40 #define TO_LOOP                 to_iso2022kr_loop
41 #define MIN_NEEDED_FROM         1
42 #define MAX_NEEDED_FROM         3
43 #define MIN_NEEDED_TO           4
44 #define MAX_NEEDED_TO           4
45 #define PREPARE_LOOP \
46   int save_set;                                                               \
47   int *setp = &data->__statep->__count;                                       \
48   if (!FROM_DIRECTION && !data->__internal_use                                \
49       && data->__invocation_counter == 0)                                     \
50     {                                                                         \
51       /* Emit the designator sequence.  */                                    \
52       if (outbuf + 4 > outend)                                                \
53         return __GCONV_FULL_OUTPUT;                                           \
54                                                                               \
55       *outbuf++ = ESC;                                                        \
56       *outbuf++ = '$';                                                        \
57       *outbuf++ = ')';                                                        \
58       *outbuf++ = 'C';                                                        \
59     }
60 #define EXTRA_LOOP_ARGS         , setp
61
62
63 /* The COUNT element of the state keeps track of the currently selected
64    character set.  The possible values are:  */
65 enum
66 {
67   ASCII_set = 0,
68   KSC5601_set = 8
69 };
70
71
72 /* Since this is a stateful encoding we have to provide code which resets
73    the output state to the initial state.  This has to be done during the
74    flushing.  */
75 #define EMIT_SHIFT_TO_INIT \
76   if (data->__statep->__count != ASCII_set)                                   \
77     {                                                                         \
78       if (FROM_DIRECTION)                                                     \
79         {                                                                     \
80           /* It's easy, we don't have to emit anything, we just reset the     \
81              state for the input.  */                                         \
82           data->__statep->__count &= 7;                                       \
83           data->__statep->__count |= ASCII_set;                               \
84         }                                                                     \
85       else                                                                    \
86         {                                                                     \
87           unsigned char *outbuf = data->__outbuf;                             \
88                                                                               \
89           /* We are not in the initial state.  To switch back we have         \
90              to emit `SI'.  */                                                \
91           if (__builtin_expect (outbuf == data->__outbufend, 0))              \
92             /* We don't have enough room in the output buffer.  */            \
93             status = __GCONV_FULL_OUTPUT;                                     \
94           else                                                                \
95             {                                                                 \
96               /* Write out the shift sequence.  */                            \
97               *outbuf++ = SI;                                                 \
98               data->__outbuf = outbuf;                                        \
99               data->__statep->__count = ASCII_set;                            \
100             }                                                                 \
101         }                                                                     \
102     }
103
104
105 /* Since we might have to reset input pointer we must be able to save
106    and retore the state.  */
107 #define SAVE_RESET_STATE(Save) \
108   if (Save)                                                                   \
109     save_set = *setp;                                                         \
110   else                                                                        \
111     *setp = save_set
112
113
114 /* First define the conversion function from ISO-2022-KR to UCS4.  */
115 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
116 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
117 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
118 #define LOOPFCT                 FROM_LOOP
119 #define BODY \
120   {                                                                           \
121     uint32_t ch = *inptr;                                                     \
122                                                                               \
123     /* This is a 7bit character set, disallow all 8bit characters.  */        \
124     if (__builtin_expect (ch, 0) > 0x7f)                                      \
125       {                                                                       \
126         if (! ignore_errors_p ())                                             \
127           {                                                                   \
128             result = __GCONV_ILLEGAL_INPUT;                                   \
129             break;                                                            \
130           }                                                                   \
131                                                                               \
132         ++inptr;                                                              \
133         ++*converted;                                                         \
134         continue;                                                             \
135       }                                                                       \
136                                                                               \
137     /* Recognize escape sequences.  */                                        \
138     if (__builtin_expect (ch, 0) == ESC)                                      \
139       {                                                                       \
140         /* We don't really have to handle escape sequences since all the      \
141            switching is done using the SI and SO bytes.  But we have to       \
142            recognize `Esc $ ) C' since this is a kind of flag for this        \
143            encoding.  We simply ignore it.  */                                \
144         if ((NEED_LENGTH_TEST && __builtin_expect (inptr + 1 > inend, 0))     \
145             || (inptr[1] == '$'                                               \
146                 && ((NEED_LENGTH_TEST                                         \
147                      && __builtin_expect (inptr + 2 > inend, 0))              \
148                     || (inptr[2] == ')'                                       \
149                         && __builtin_expect (inptr + 3 > inend, 0)))))        \
150                                                                               \
151           {                                                                   \
152             result = __GCONV_EMPTY_INPUT;                                     \
153             break;                                                            \
154           }                                                                   \
155         if (inptr[1] == '$' && inptr[2] == ')' && inptr[3] == 'C')            \
156           {                                                                   \
157             /* Yeah, yeah, we know this is ISO 2022-KR.  */                   \
158             inptr += 4;                                                       \
159             continue;                                                         \
160           }                                                                   \
161       }                                                                       \
162     else if (__builtin_expect (ch, 0) == SO)                                  \
163       {                                                                       \
164         /* Switch to use KSC.  */                                             \
165         ++inptr;                                                              \
166         set = KSC5601_set;                                                    \
167         continue;                                                             \
168       }                                                                       \
169     else if (__builtin_expect (ch, 0) == SI)                                  \
170       {                                                                       \
171         /* Switch to use ASCII.  */                                           \
172         ++inptr;                                                              \
173         set = ASCII_set;                                                      \
174         continue;                                                             \
175       }                                                                       \
176                                                                               \
177     if (set == ASCII_set)                                                     \
178       {                                                                       \
179         /* Almost done, just advance the input pointer.  */                   \
180         ++inptr;                                                              \
181       }                                                                       \
182     else                                                                      \
183       {                                                                       \
184         assert (set == KSC5601_set);                                          \
185                                                                               \
186         /* Use the KSC 5601 table.  */                                        \
187         ch = ksc5601_to_ucs4 (&inptr,                                         \
188                               NEED_LENGTH_TEST ? inend - inptr : 2, 0);       \
189                                                                               \
190         if (NEED_LENGTH_TEST && __builtin_expect (ch, 1) == 0)                \
191           {                                                                   \
192             result = __GCONV_EMPTY_INPUT;                                     \
193             break;                                                            \
194           }                                                                   \
195         else if (__builtin_expect (ch, 0) == __UNKNOWN_10646_CHAR)            \
196           {                                                                   \
197             if (! ignore_errors_p ())                                         \
198               {                                                               \
199                 /* This is an illegal character.  */                          \
200                 result = __GCONV_ILLEGAL_INPUT;                               \
201                 break;                                                        \
202               }                                                               \
203                                                                               \
204             ++*converted;                                                     \
205             ++inptr;                                                          \
206             continue;                                                         \
207           }                                                                   \
208       }                                                                       \
209                                                                               \
210     put32 (outptr, ch);                                                       \
211     outptr += 4;                                                              \
212   }
213 #define EXTRA_LOOP_DECLS        , int *setp
214 #define INIT_PARAMS             int set = *setp
215 #define UPDATE_PARAMS           *setp = set
216 #include <iconv/loop.c>
217
218
219 /* Next, define the other direction.  */
220 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
221 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
222 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_FROM
223 #define LOOPFCT                 TO_LOOP
224 #define BODY \
225   {                                                                           \
226     uint32_t ch;                                                              \
227     size_t written = 0;                                                       \
228                                                                               \
229     ch = get32 (inptr);                                                       \
230                                                                               \
231     /* First see whether we can write the character using the currently       \
232        selected character set.  */                                            \
233     if (ch < 0x80)                                                            \
234       {                                                                       \
235         if (set != ASCII_set)                                                 \
236           {                                                                   \
237             *outptr++ = SI;                                                   \
238             set = ASCII_set;                                                  \
239             if (NEED_LENGTH_TEST && outptr == outend)                         \
240               {                                                               \
241                 result = __GCONV_FULL_OUTPUT;                                 \
242                 break;                                                        \
243               }                                                               \
244           }                                                                   \
245                                                                               \
246         *outptr++ = ch;                                                       \
247         written = 1;                                                          \
248       }                                                                       \
249     else                                                                      \
250       {                                                                       \
251         char buf[2];                                                          \
252                                                                               \
253         written = ucs4_to_ksc5601 (ch, buf, 2);                               \
254                                                                               \
255         if (__builtin_expect (written, 0) == __UNKNOWN_10646_CHAR)            \
256           {                                                                   \
257             /* Illegal character.  */                                         \
258             if (! ignore_errors_p ())                                         \
259               {                                                               \
260                 result = __GCONV_ILLEGAL_INPUT;                               \
261                 break;                                                        \
262               }                                                               \
263                                                                               \
264             ++*converted;                                                     \
265           }                                                                   \
266         else                                                                  \
267           {                                                                   \
268             assert (written == 2);                                            \
269                                                                               \
270             /* We use KSC 5601.  */                                           \
271             if (set != KSC5601_set)                                           \
272               {                                                               \
273                 *outptr++ = SO;                                               \
274                 set = KSC5601_set;                                            \
275               }                                                               \
276                                                                               \
277             if (NEED_LENGTH_TEST && __builtin_expect (outptr + 2 > outend, 0))\
278               {                                                               \
279                 result = __GCONV_FULL_OUTPUT;                                 \
280                 break;                                                        \
281               }                                                               \
282                                                                               \
283             *outptr++ = buf[0];                                               \
284             *outptr++ = buf[1];                                               \
285           }                                                                   \
286       }                                                                       \
287                                                                               \
288     /* Now that we wrote the output increment the input pointer.  */          \
289     inptr += 4;                                                               \
290   }
291 #define EXTRA_LOOP_DECLS        , int *setp
292 #define INIT_PARAMS             int set = *setp
293 #define UPDATE_PARAMS           *setp = set
294 #include <iconv/loop.c>
295
296
297 /* Now define the toplevel functions.  */
298 #include <iconv/skeleton.c>