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6cbf845fcd
In several converters, a __GCONV_ILLEGAL_INPUT result gets overwritten with __GCONV_FULL_OUTPUT. As a result, iconv (the function) returns E2BIG instead of EILSEQ. The iconv program does not see the original EILSEQ failure, does not recognize the invalid input, and may incorrectly exit successfully. To address this, a new __flags bit is used to indicate a sticky input error state. All __GCONV_ILLEGAL_INPUT results are replaced with a function call that sets this new __GCONV_ENCOUNTERED_ILLEGAL_INPUT and returns __GCONV_ILLEGAL_INPUT. The iconv program checks for __GCONV_ENCOUNTERED_ILLEGAL_INPUT and overrides the exit status. The converter changes introducing __gconv_mark_illegal_input are mostly mechanical, except for the res variable initialization in iconvdata/iso-2022-jp.c: this error gets overwritten with __GCONV_OK and other results in the following code. If res == __GCONV_ILLEGAL_INPUT afterwards, STANDARD_TO_LOOP_ERR_HANDLER below will handle it. The __gconv_mark_illegal_input changes do not alter the errno value set by the iconv function. This is simpler to implement than reviewing each __GCONV_FULL_OUTPUT result and adjust it not to override a previous __GCONV_ILLEGAL_INPUT result. Doing it that way would also change some E2BIG errors in to EILSEQ errors, so it had to be done conditionally (under a flag set by the iconv program only), to avoid confusing buffer management in other applications. Reviewed-by: DJ Delorie <dj@redhat.com>
388 lines
12 KiB
C
388 lines
12 KiB
C
/* Conversion from and to IBM1364.
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Copyright (C) 2005-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <stdint.h>
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#include <wchar.h>
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#include <byteswap.h>
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#ifndef CHARSET_NAME
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/* This is really the IBM1364 converter, not another module sharing
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the code. */
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# define DATA_HEADER "ibm1364.h"
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# define CHARSET_NAME "IBM1364//"
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# define FROM_LOOP from_ibm1364
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# define TO_LOOP to_ibm1364
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# define SB_TO_UCS4 __ibm1364sb_to_ucs4
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# define DB_TO_UCS4_IDX __ibm1364db_to_ucs4_idx
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# define DB_TO_UCS4 __ibm1364db_to_ucs4
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# define UCS4_TO_SB_IDX __ucs4_to_ibm1364sb_idx
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# define UCS4_TO_SB __ucs4_to_ibm1364sb
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# define UCS4_TO_DB_IDX __ucs4_to_ibm1364db_idx
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# define UCS4_TO_DB __ucs4_to_ibm1364db
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# define UCS_LIMIT 0xffff
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#endif
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#include DATA_HEADER
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/* The shift sequences for this charset (it does not use ESC). */
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#define SI 0x0F /* Shift In, host code to turn DBCS off. */
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#define SO 0x0E /* Shift Out, host code to turn DBCS on. */
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/* Definitions used in the body of the `gconv' function. */
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 2
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#define MIN_NEEDED_TO 4
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#ifdef HAS_COMBINED
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# define MAX_NEEDED_TO 8
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#else
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# define MAX_NEEDED_TO 4
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#endif
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#define ONE_DIRECTION 0
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#define PREPARE_LOOP \
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int save_curcs; \
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int *curcsp = &data->__statep->__count;
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#define EXTRA_LOOP_ARGS , curcsp
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/* Definitions of initialization and destructor function. */
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#define DEFINE_INIT 1
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#define DEFINE_FINI 1
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/* Since this is a stateful encoding we have to provide code which resets
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the output state to the initial state. This has to be done during the
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flushing. */
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#define EMIT_SHIFT_TO_INIT \
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if ((data->__statep->__count & ~7) != sb) \
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{ \
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if (FROM_DIRECTION) \
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data->__statep->__count &= 7; \
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else \
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{ \
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/* We are not in the initial state. To switch back we have \
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to emit `SI'. */ \
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if (__glibc_unlikely (outbuf >= outend)) \
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/* We don't have enough room in the output buffer. */ \
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status = __GCONV_FULL_OUTPUT; \
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else \
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{ \
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/* Write out the shift sequence. */ \
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*outbuf++ = SI; \
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data->__statep->__count &= 7; \
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} \
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} \
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}
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/* Since we might have to reset input pointer we must be able to save
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and restore the state. */
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#define SAVE_RESET_STATE(Save) \
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if (Save) \
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save_curcs = *curcsp; \
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else \
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*curcsp = save_curcs
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/* Current codeset type. */
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enum
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{
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sb = 0,
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db = 64
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};
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/* Subroutine to write out converted UCS4 from IBM-13XX. */
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#ifdef HAS_COMBINED
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# define SUB_COMBINED_UCS_FROM_IBM13XX \
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{ \
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if (res != UCS_LIMIT || ch < __TO_UCS4_COMBINED_MIN \
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|| ch > __TO_UCS4_COMBINED_MAX) \
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{ \
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put32 (outptr, res); \
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outptr += 4; \
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} \
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else \
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{ \
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/* This is a combined character. Make sure we have room. */ \
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if (__glibc_unlikely (outptr + 8 > outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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const struct divide *cmbp \
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= &DB_TO_UCS4_COMB[ch - __TO_UCS4_COMBINED_MIN]; \
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assert (cmbp->res1 != 0 && cmbp->res2 != 0); \
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\
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put32 (outptr, cmbp->res1); \
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outptr += 4; \
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put32 (outptr, cmbp->res2); \
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outptr += 4; \
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} \
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}
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#else
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# define SUB_COMBINED_UCS_FROM_IBM13XX \
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{ \
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put32 (outptr, res); \
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outptr += 4; \
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}
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#endif /* HAS_COMBINED */
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/* First, define the conversion function from IBM-13XX to UCS4. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch = *inptr; \
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\
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if (__builtin_expect (ch, 0) == SO) \
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{ \
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/* Shift OUT, change to DBCS converter (redundant escape okay). */ \
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curcs = db; \
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++inptr; \
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continue; \
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} \
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if (__builtin_expect (ch, 0) == SI) \
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{ \
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/* Shift IN, change to SBCS converter (redundant escape okay). */ \
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curcs = sb; \
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++inptr; \
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continue; \
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} \
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\
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if (curcs == sb) \
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{ \
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/* Use the IBM13XX table for single byte. */ \
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uint32_t res = SB_TO_UCS4[ch]; \
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if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0') \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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{ \
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result = __gconv_mark_illegal_input (step_data); \
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break; \
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} \
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++*irreversible; \
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} \
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else \
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{ \
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put32 (outptr, res); \
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outptr += 4; \
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} \
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++inptr; \
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} \
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else \
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{ \
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assert (curcs == db); \
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\
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if (__glibc_unlikely (inptr + 1 >= inend)) \
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{ \
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/* The second character is not available. Store the \
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intermediate result. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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ch = (ch * 0x100) + inptr[1]; \
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\
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/* Use the IBM1364 table for double byte. */ \
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const struct gap *rp2 = DB_TO_UCS4_IDX; \
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while (ch > rp2->end) \
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++rp2; \
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\
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uint32_t res; \
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if (__builtin_expect (rp2->start == 0xffff, 0) \
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|| __builtin_expect (ch < rp2->start, 0) \
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|| (res = DB_TO_UCS4[ch + rp2->idx], \
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__builtin_expect (res, L'\1') == L'\0' && ch != '\0')) \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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{ \
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result = __gconv_mark_illegal_input (step_data); \
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break; \
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} \
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++*irreversible; \
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} \
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else \
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{ \
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SUB_COMBINED_UCS_FROM_IBM13XX; \
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} \
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inptr += 2; \
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} \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS , int *curcsp
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#define INIT_PARAMS int curcs = *curcsp & ~7
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#define UPDATE_PARAMS *curcsp = curcs
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#include <iconv/loop.c>
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/* Subroutine to convert two UCS4 codes to IBM-13XX. */
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#ifdef HAS_COMBINED
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# define SUB_COMBINED_UCS_TO_IBM13XX \
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{ \
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const struct combine *cmbp = UCS4_COMB_TO_DB; \
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while (cmbp->res1 < ch) \
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++cmbp; \
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/* XXX if last char is beginning of combining store in state */ \
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if (cmbp->res1 == ch && inptr + 4 < inend) \
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{ \
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/* See if input is part of a combined character. */ \
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uint32_t ch_next = get32 (inptr + 4); \
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while (cmbp->res2 != ch_next) \
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{ \
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++cmbp; \
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if (cmbp->res1 != ch) \
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goto not_combined; \
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} \
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\
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/* It is a combined character. First make sure we are in \
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double byte mode. */ \
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if (curcs == sb) \
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{ \
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/* We know there is room for at least one byte. */ \
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*outptr++ = SO; \
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curcs = db; \
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} \
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\
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if (__glibc_unlikely (outptr + 2 > outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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*outptr++ = cmbp->ch[0]; \
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*outptr++ = cmbp->ch[1]; \
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inptr += 8; \
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continue; \
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\
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not_combined:; \
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} \
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}
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#else
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# define SUB_COMBINED_UCS_TO_IBM13XX
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#endif /* HAS_COMBINED */
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/* Next, define the other direction. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MAX_NEEDED_INPUT MAX_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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uint32_t ch = get32 (inptr); \
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\
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if (__glibc_unlikely (ch >= UCS_LIMIT)) \
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{ \
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UNICODE_TAG_HANDLER (ch, 4); \
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\
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if (! ignore_errors_p ()) \
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{ \
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result = __gconv_mark_illegal_input (step_data); \
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break; \
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} \
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++*irreversible; \
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inptr += 4; \
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continue; \
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} \
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\
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SUB_COMBINED_UCS_TO_IBM13XX; \
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\
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const struct gap *rp1 = UCS4_TO_SB_IDX; \
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while (ch > rp1->end) \
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++rp1; \
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\
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/* Use the UCS4 table for single byte. */ \
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const char *cp; \
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if (__builtin_expect (ch < rp1->start, 0) \
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|| (cp = UCS4_TO_SB[ch + rp1->idx], \
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__builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0')) \
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{ \
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/* Use the UCS4 table for double byte. */ \
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const struct gap *rp2 = UCS4_TO_DB_IDX; \
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while (ch > rp2->end) \
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++rp2; \
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\
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if (__builtin_expect (ch < rp2->start, 0) \
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|| (cp = UCS4_TO_DB[ch + rp2->idx], \
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__builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0')) \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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{ \
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result = __gconv_mark_illegal_input (step_data); \
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break; \
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} \
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++*irreversible; \
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} \
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else \
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{ \
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if (curcs == sb) \
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{ \
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/* We know there is room for at least one byte. */ \
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*outptr++ = SO; \
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curcs = db; \
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} \
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\
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if (__glibc_unlikely (outptr + 2 > outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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*outptr++ = cp[0]; \
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*outptr++ = cp[1]; \
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} \
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} \
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else \
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{ \
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if (__glibc_unlikely (curcs == db)) \
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{ \
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/* We know there is room for at least one byte. */ \
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*outptr++ = SI; \
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curcs = sb; \
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\
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if (__glibc_unlikely (outptr >= outend)) \
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{ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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} \
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\
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*outptr++ = cp[0]; \
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} \
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\
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/* Now that we wrote the output increment the input pointer. */ \
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inptr += 4; \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS , int *curcsp
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#define INIT_PARAMS int curcs = *curcsp & ~7
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#define REINIT_PARAMS curcs = *curcsp & ~7
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#define UPDATE_PARAMS *curcsp = curcs
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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