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glibc/iconvdata/iso-2022-cn.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

407 lines
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/* Conversion module for ISO-2022-CN.
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <gconv.h>
#include <stdint.h>
#include <string.h>
#include "gb2312.h"
#include "cns11643l1.h"
#include "cns11643l2.h"
#include <assert.h>
/* This makes obvious what everybody knows: 0x1b is the Esc character. */
#define ESC 0x1b
/* We have single-byte shift-in and shift-out sequences, and the single
shift sequence SS2 which replaces the SS2 designation for the next
two bytes. */
#define SI 0x0f
#define SO 0x0e
#define SS2_0 ESC
#define SS2_1 0x4e
/* Definitions used in the body of the `gconv' function. */
#define CHARSET_NAME "ISO-2022-CN//"
#define DEFINE_INIT 1
#define DEFINE_FINI 1
#define FROM_LOOP from_iso2022cn_loop
#define TO_LOOP to_iso2022cn_loop
#define ONE_DIRECTION 0
#define FROM_LOOP_MIN_NEEDED_FROM 1
#define FROM_LOOP_MAX_NEEDED_FROM 4
#define FROM_LOOP_MIN_NEEDED_TO 4
#define FROM_LOOP_MAX_NEEDED_TO 4
#define TO_LOOP_MIN_NEEDED_FROM 4
#define TO_LOOP_MAX_NEEDED_FROM 4
#define TO_LOOP_MIN_NEEDED_TO 1
#define TO_LOOP_MAX_NEEDED_TO 6
#define PREPARE_LOOP \
int save_set; \
int *setp = &data->__statep->__count;
#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,
GB2312_set = 8,
CNS11643_1_set = 16,
CNS11643_2_set = 24,
CURRENT_SEL_MASK = 24,
GB2312_ann = 32,
CNS11643_1_ann = 64,
CNS11643_2_ann = 128,
CURRENT_ANN_MASK = 224
};
/* 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 = 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-CN to UCS4. */
#define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_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) \
{ \
/* There are two kinds of escape sequences we have to handle: \
- those announcing the use of GB and CNS characters on the \
line; we can simply ignore them \
- the initial byte of the SS2 sequence. \
*/ \
if (__builtin_expect (inptr + 2 > inend, 0) \
|| (inptr[1] == '$' \
&& (__builtin_expect (inptr + 3 > inend, 0) \
|| (inptr[2] == ')' \
&& __builtin_expect (inptr + 4 > inend, 0)) \
|| (inptr[2] == '*' \
&& __builtin_expect (inptr + 4 > inend, 0)))) \
|| (inptr[1] == SS2_1 \
&& __builtin_expect (inptr + 4 > inend, 0))) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
if (inptr[1] == '$' \
&& ((inptr[2] == ')' && (inptr[3] == 'A' || inptr[3] == 'G')) \
|| (inptr[2] == '*' && inptr[3] == 'H'))) \
{ \
/* OK, we accept those character sets. */ \
if (inptr[3] == 'A') \
ann = GB2312_ann; \
else if (inptr[3] == 'G') \
ann = CNS11643_1_ann; \
inptr += 4; \
continue; \
} \
} \
else if (__builtin_expect (ch, 0) == SO) \
{ \
/* Switch to use GB2312 or CNS 11643 plane 1, depending on which \
S0 designation came last. The only problem is what to do with \
faulty input files where no designator came. \
XXX For now I'll default to use GB2312. If this is not the \
best behaviour (e.g., we should flag an error) let me know. */ \
++inptr; \
set = ann == CNS11643_1_ann ? CNS11643_1_set : GB2312_set; \
continue; \
} \
else if (__builtin_expect (ch, 0) == SI) \
{ \
/* Switch to use ASCII. */ \
++inptr; \
set = ASCII_set; \
continue; \
} \
\
if (__builtin_expect (ch, 0) == ESC && inptr[1] == SS2_1) \
{ \
/* This is a character from CNS 11643 plane 2. \
XXX We could test here whether the use of this character \
set was announced. */ \
inptr += 2; \
ch = cns11643l2_to_ucs4 (&inptr, 2, 0); \
if (__builtin_expect (ch, 0) == __UNKNOWN_10646_CHAR) \
{ \
inptr -= 2; \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
} \
else if (set == ASCII_set) \
{ \
/* Almost done, just advance the input pointer. */ \
++inptr; \
} \
else \
{ \
/* That's pretty easy, we have a dedicated functions for this. */ \
if (set == GB2312_set) \
ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0); \
else \
{ \
assert (set == CNS11643_1_set); \
ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0); \
} \
\
if (__builtin_expect (ch, 1) == 0) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
else if (__builtin_expect (ch, 1) == __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 & CURRENT_SEL_MASK; \
int ann = *setp & CURRENT_ANN_MASK
#define UPDATE_PARAMS *setp = set | ann
#include <iconv/loop.c>
/* Next, define the other direction. */
#define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO
#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; \
\
/* At the end of the line we have to clear the `ann' flags since \
every line must contain this information again. */ \
if (ch == L'\n') \
ann = 0; \
} \
else \
{ \
unsigned char buf[2]; \
/* Fake initialization to keep gcc quiet. */ \
asm ("" : "=m" (buf)); \
\
int used; \
size_t written = 0; \
\
if (set == GB2312_set || (ann & CNS11643_1_ann) == 0) \
{ \
written = ucs4_to_gb2312 (ch, buf, 2); \
used = GB2312_set; \
} \
else \
{ \
written = ucs4_to_cns11643l1 (ch, buf, 2); \
used = CNS11643_1_set; \
} \
\
if (written == __UNKNOWN_10646_CHAR) \
{ \
/* Cannot convert it using the currently selected SO set. \
Next try the SS2 set. */ \
written = ucs4_to_cns11643l2 (ch, buf, 2); \
if (written != __UNKNOWN_10646_CHAR) \
/* Yep, that worked. */ \
used = CNS11643_2_set; \
else \
{ \
/* Well, see whether we have to change the SO set. */ \
if (used == GB2312_set) \
written = ucs4_to_cns11643l1 (ch, buf, 2); \
else \
written = ucs4_to_gb2312 (ch, buf, 2); \
\
if (__builtin_expect (written, 0) != __UNKNOWN_10646_CHAR) \
/* Oh well, then switch SO. */ \
used = GB2312_set + CNS11643_1_set - used; \
else \
{ \
UNICODE_TAG_HANDLER (ch, 4); \
\
/* Even this does not work. Error. */ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
} \
} \
assert (written == 2); \
\
/* See whether we have to emit an escape sequence. */ \
if (set != used) \
{ \
/* First see whether we announced that we use this \
character set. */ \
if ((ann & (16 << (used >> 3))) == 0) \
{ \
const char *escseq; \
\
if (__glibc_unlikely (outptr + 4 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
assert ((used >> 3) >= 1 && (used >> 3) <= 3); \
escseq = ")A)G*H" + ((used >> 3) - 1) * 2; \
*outptr++ = ESC; \
*outptr++ = '$'; \
*outptr++ = *escseq++; \
*outptr++ = *escseq++; \
\
if (used == GB2312_set) \
ann = (ann & CNS11643_2_ann) | GB2312_ann; \
else if (used == CNS11643_1_set) \
ann = (ann & CNS11643_2_ann) | CNS11643_1_ann; \
else \
ann |= CNS11643_2_ann; \
} \
\
if (used == CNS11643_2_set) \
{ \
if (__glibc_unlikely (outptr + 2 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = SS2_0; \
*outptr++ = SS2_1; \
} \
else \
{ \
/* We only have to emit something is currently ASCII is \
selected. Otherwise we are switching within the \
SO charset. */ \
if (set == ASCII_set) \
{ \
if (__glibc_unlikely (outptr + 1 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = SO; \
} \
} \
\
/* Always test the length here since we have used up all the \
guaranteed output buffer slots. */ \
if (__glibc_unlikely (outptr + 2 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
} \
else if (__glibc_unlikely (outptr + 2 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*outptr++ = buf[0]; \
*outptr++ = buf[1]; \
set = used; \
} \
\
/* 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 & CURRENT_SEL_MASK; \
int ann = *setp & CURRENT_ANN_MASK
#define REINIT_PARAMS do \
{ \
set = *setp & CURRENT_SEL_MASK; \
ann = *setp & CURRENT_ANN_MASK; \
} \
while (0)
#define UPDATE_PARAMS *setp = set | ann
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
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