File: iso-2022-kr.c

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (270 lines) | stat: -rw-r--r-- 9,026 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/* Conversion module for ISO-2022-KR.
   Copyright (C) 1998-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <dlfcn.h>
#include <gconv.h>
#include <stdint.h>
#include <string.h>
#include "ksc5601.h"

#include <assert.h>

/* This makes obvious what everybody knows: 0x1b is the Esc character.  */
#define ESC	0x1b

/* The shift sequences for this charset (it does not use ESC).  */
#define SI	0x0f
#define SO	0x0e

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME		"ISO-2022-KR//"
#define DEFINE_INIT		1
#define DEFINE_FINI		1
#define FROM_LOOP		from_iso2022kr_loop
#define TO_LOOP			to_iso2022kr_loop
#define MIN_NEEDED_FROM		1
#define MAX_NEEDED_FROM		4
#define MIN_NEEDED_TO		4
#define MAX_NEEDED_TO		4
#define ONE_DIRECTION		0
#define PREPARE_LOOP \
  int save_set;								      \
  int *setp = &data->__statep->__count;					      \
  if (!FROM_DIRECTION && !data->__internal_use				      \
      && data->__invocation_counter == 0)				      \
    {									      \
      /* Emit the designator sequence.  */				      \
      if (outbuf + 4 > outend)						      \
	return __GCONV_FULL_OUTPUT;					      \
									      \
      *outbuf++ = ESC;							      \
      *outbuf++ = '$';							      \
      *outbuf++ = ')';							      \
      *outbuf++ = 'C';							      \
    }
#define EXTRA_LOOP_ARGS		, setp


/* The COUNT element of the state keeps track of the currently selected
   character set.  The possible values are:  */
enum
{
  ASCII_set = 0,
  KSC5601_set = 8
};


/* Since this is a stateful encoding we have to provide code which resets
   the output state to the initial state.  This has to be done during the
   flushing.  */
#define EMIT_SHIFT_TO_INIT \
  if (data->__statep->__count != ASCII_set)				      \
    {									      \
      if (FROM_DIRECTION)						      \
	{								      \
	  /* It's easy, we don't have to emit anything, we just reset the     \
	     state for the input.  */					      \
	  data->__statep->__count &= 7;					      \
	  data->__statep->__count |= ASCII_set;				      \
	}								      \
      else								      \
	{								      \
	  /* We are not in the initial state.  To switch back we have	      \
	     to emit `SI'.  */						      \
	  if (__glibc_unlikely (outbuf == outend))			      \
	    /* We don't have enough room in the output buffer.  */	      \
	    status = __GCONV_FULL_OUTPUT;				      \
	  else								      \
	    {								      \
	      /* Write out the shift sequence.  */			      \
	      *outbuf++ = SI;						      \
	      data->__statep->__count = ASCII_set;			      \
	    }								      \
	}								      \
    }


/* Since we might have to reset input pointer we must be able to save
   and retore the state.  */
#define SAVE_RESET_STATE(Save) \
  if (Save)								      \
    save_set = *setp;							      \
  else									      \
    *setp = save_set


/* First define the conversion function from ISO-2022-KR to UCS4.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT	MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY \
  {									      \
    uint32_t ch = *inptr;						      \
									      \
    /* This is a 7bit character set, disallow all 8bit characters.  */	      \
    if (__glibc_unlikely (ch > 0x7f))					      \
      STANDARD_FROM_LOOP_ERR_HANDLER (1);				      \
									      \
    /* Recognize escape sequences.  */					      \
    if (__builtin_expect (ch, 0) == ESC)				      \
      {									      \
	/* We don't really have to handle escape sequences since all the      \
	   switching is done using the SI and SO bytes.  But we have to	      \
	   recognize `Esc $ ) C' since this is a kind of flag for this	      \
	   encoding.  We simply ignore it.  */				      \
	if (__builtin_expect (inptr + 2 > inend, 0)			      \
	    || (inptr[1] == '$'						      \
		&& (__builtin_expect (inptr + 3 > inend, 0)		      \
		    || (inptr[2] == ')'					      \
			&& __builtin_expect (inptr + 4 > inend, 0)))))	      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
	if (inptr[1] == '$' && inptr[2] == ')' && inptr[3] == 'C')	      \
	  {								      \
	    /* Yeah, yeah, we know this is ISO 2022-KR.  */		      \
	    inptr += 4;							      \
	    continue;							      \
	  }								      \
      }									      \
    else if (__builtin_expect (ch, 0) == SO)				      \
      {									      \
	/* Switch to use KSC.  */					      \
	++inptr;							      \
	set = KSC5601_set;						      \
	continue;							      \
      }									      \
    else if (__builtin_expect (ch, 0) == SI)				      \
      {									      \
	/* Switch to use ASCII.  */					      \
	++inptr;							      \
	set = ASCII_set;						      \
	continue;							      \
      }									      \
									      \
    if (set == ASCII_set)						      \
      {									      \
	/* Almost done, just advance the input pointer.  */		      \
	++inptr;							      \
      }									      \
    else								      \
      {									      \
	assert (set == KSC5601_set);					      \
									      \
	/* Use the KSC 5601 table.  */					      \
	ch = ksc5601_to_ucs4 (&inptr, inend - inptr, 0);		      \
									      \
	if (__glibc_unlikely (ch == 0))					      \
	  {								      \
	    result = __GCONV_INCOMPLETE_INPUT;				      \
	    break;							      \
	  }								      \
	else if (__glibc_unlikely (ch == __UNKNOWN_10646_CHAR))		      \
	  {								      \
	    STANDARD_FROM_LOOP_ERR_HANDLER (1);				      \
	  }								      \
      }									      \
									      \
    put32 (outptr, ch);							      \
    outptr += 4;							      \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS	, int *setp
#define INIT_PARAMS		int set = *setp
#define UPDATE_PARAMS		*setp = set
#include <iconv/loop.c>


/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT	MAX_NEEDED_FROM
#define LOOPFCT			TO_LOOP
#define BODY \
  {									      \
    uint32_t ch = get32 (inptr);					      \
									      \
    /* First see whether we can write the character using the currently	      \
       selected character set.  */					      \
    if (ch < 0x80)							      \
      {									      \
	if (set != ASCII_set)						      \
	  {								      \
	    *outptr++ = SI;						      \
	    set = ASCII_set;						      \
	    if (__glibc_unlikely (outptr == outend))			      \
	      {								      \
		result = __GCONV_FULL_OUTPUT;				      \
		break;							      \
	      }								      \
	  }								      \
 									      \
	*outptr++ = ch;							      \
      }									      \
    else								      \
      {									      \
	unsigned char buf[2];						      \
	/* Fake initialization to keep gcc quiet.  */			      \
	asm ("" : "=m" (buf));						      \
									      \
	size_t written = ucs4_to_ksc5601 (ch, buf, 2);			      \
	if (__builtin_expect (written, 0) == __UNKNOWN_10646_CHAR)	      \
	  {								      \
	    UNICODE_TAG_HANDLER (ch, 4);				      \
									      \
	    /* Illegal character.  */					      \
	    STANDARD_TO_LOOP_ERR_HANDLER (4);				      \
	  }								      \
	else								      \
	  {								      \
	    assert (written == 2);					      \
									      \
	    /* We use KSC 5601.  */					      \
	    if (set != KSC5601_set)					      \
	      {								      \
		*outptr++ = SO;						      \
		set = KSC5601_set;					      \
	      }								      \
									      \
	    if (__glibc_unlikely (outptr + 2 > outend))			      \
	      {								      \
		result = __GCONV_FULL_OUTPUT;				      \
		break;							      \
	      }								      \
									      \
	    *outptr++ = buf[0];						      \
	    *outptr++ = buf[1];						      \
	  }								      \
      }									      \
									      \
    /* Now that we wrote the output increment the input pointer.  */	      \
    inptr += 4;								      \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS	, int *setp
#define INIT_PARAMS		int set = *setp
#define REINIT_PARAMS		set = *setp
#define UPDATE_PARAMS		*setp = set
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>