iconv/skeleton.c

   1 /* Skeleton for a conversion module.
   2    Copyright (C) 1998, 1999, 2000, 2001 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 Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the 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    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* This file can be included to provide definitions of several things
  22    many modules have in common.  It can be customized using the following
  23    macros:
  24
  25      DEFINE_INIT        define the default initializer.  This requires the
  26                         following symbol to be defined.
  27
  28      CHARSET_NAME       string with official name of the coded character
  29                         set (in all-caps)
  30
  31      DEFINE_FINI        define the default destructor function.
  32
  33      MIN_NEEDED_FROM    minimal number of bytes needed for the from-charset.
  34      MIN_NEEDED_TO      likewise for the to-charset.
  35
  36      MAX_NEEDED_FROM    maximal number of bytes needed for the from-charset.
  37                         This macro is optional, it defaults to MIN_NEEDED_FROM.
  38      MAX_NEEDED_TO      likewise for the to-charset.
  39
  40      DEFINE_DIRECTION_OBJECTS
  41                         two objects will be defined to be used when the
  42                         `gconv' function must only distinguish two
  43                         directions.  This is implied by DEFINE_INIT.
  44                         If this macro is not defined the following
  45                         macro must be available.
  46
  47      FROM_DIRECTION     this macro is supposed to return a value != 0
  48                         if we convert from the current character set,
  49                         otherwise it return 0.
  50
  51      EMIT_SHIFT_TO_INIT this symbol is optional.  If it is defined it
  52                         defines some code which writes out a sequence
  53                         of characters which bring the current state into
  54                         the initial state.
  55
  56      FROM_LOOP          name of the function implementing the conversion
  57                         from the current characters.
  58      TO_LOOP            likewise for the other direction
  59
  60      ONE_DIRECTION      optional.  If defined to 1, only one conversion
  61                         direction is defined instead of two.  In this
  62                         case, FROM_DIRECTION should be defined to 1, and
  63                         FROM_LOOP and TO_LOOP should have the same value.
  64
  65      SAVE_RESET_STATE   in case of an error we must reset the state for
  66                         the rerun so this macro must be defined for
  67                         stateful encodings.  It takes an argument which
  68                         is nonzero when saving.
  69
  70      RESET_INPUT_BUFFER If the input character sets allow this the macro
  71                         can be defined to reset the input buffer pointers
  72                         to cover only those characters up to the error.
  73
  74      FUNCTION_NAME      if not set the conversion function is named `gconv'.
  75
  76      PREPARE_LOOP       optional code preparing the conversion loop.  Can
  77                         contain variable definitions.
  78      END_LOOP           also optional, may be used to store information
  79
  80      EXTRA_LOOP_ARGS    optional macro specifying extra arguments passed
  81                         to loop function.
  82  */
  83
  84 #include <assert.h>
  85 #include <gconv.h>
  86 #include <string.h>
  87 #define __need_size_t
  88 #define __need_NULL
  89 #include <stddef.h>
  90
  91 #ifndef STATIC_GCONV
  92 # include <dlfcn.h>
  93 #endif
  94
  95 #ifndef DL_CALL_FCT
  96 # define DL_CALL_FCT(fct, args) fct args
  97 #endif
  98
  99 /* The direction objects.  */
 100 #if DEFINE_DIRECTION_OBJECTS || DEFINE_INIT
 101 static int from_object;
 102 static int to_object;
 103
 104 # ifndef FROM_DIRECTION
 105 #  define FROM_DIRECTION (step->__data == &from_object)
 106 # endif
 107 #else
 108 # ifndef FROM_DIRECTION
 109 #  error "FROM_DIRECTION must be provided if direction objects are not used"
 110 # endif
 111 #endif
 112
 113
 114 /* How many bytes are needed at most for the from-charset.  */
 115 #ifndef MAX_NEEDED_FROM
 116 # define MAX_NEEDED_FROM        MIN_NEEDED_FROM
 117 #endif
 118
 119 /* Same for the to-charset.  */
 120 #ifndef MAX_NEEDED_TO
 121 # define MAX_NEEDED_TO          MIN_NEEDED_TO
 122 #endif
 123
 124
 125 /* Define macros which can access unaligned buffers.  These macros are
 126    supposed to be used only in code outside the inner loops.  For the inner
 127    loops we have other definitions which allow optimized access.  */
 128 #ifdef _STRING_ARCH_unaligned
 129 /* We can handle unaligned memory access.  */
 130 # define get16u(addr) *((__const uint16_t *) (addr))
 131 # define get32u(addr) *((__const uint32_t *) (addr))
 132
 133 /* We need no special support for writing values either.  */
 134 # define put16u(addr, val) *((uint16_t *) (addr)) = (val)
 135 # define put32u(addr, val) *((uint32_t *) (addr)) = (val)
 136 #else
 137 /* Distinguish between big endian and little endian.  */
 138 # if __BYTE_ORDER == __LITTLE_ENDIAN
 139 #  define get16u(addr) \
 140      (((__const unsigned char *) (addr))[1] << 8                              \
 141       | ((__const unsigned char *) (addr))[0])
 142 #  define get32u(addr) \
 143      (((((__const unsigned char *) (addr))[3] << 8                            \
 144         | ((__const unsigned char *) (addr))[2]) << 8                         \
 145        | ((__const unsigned char *) (addr))[1]) << 8                          \
 146       | ((__const unsigned char *) (addr))[0])
 147
 148 #  define put16u(addr, val) \
 149      ({ uint16_t __val = (val);                                               \
 150         ((unsigned char *) (addr))[0] = __val;                                \
 151         ((unsigned char *) (addr))[1] = __val >> 8;                           \
 152         (void) 0; })
 153 #  define put32u(addr, val) \
 154      ({ uint32_t __val = (val);                                               \
 155         ((unsigned char *) (addr))[0] = __val;                                \
 156         __val >>= 8;                                                          \
 157         ((unsigned char *) (addr))[1] = __val;                                \
 158         __val >>= 8;                                                          \
 159         ((unsigned char *) (addr))[2] = __val;                                \
 160         __val >>= 8;                                                          \
 161         ((unsigned char *) (addr))[3] = __val;                                \
 162         (void) 0; })
 163 # else
 164 #  define get16u(addr) \
 165      (((__const unsigned char *) (addr))[0] << 8                              \
 166       | ((__const unsigned char *) (addr))[1])
 167 #  define get32u(addr) \
 168      (((((__const unsigned char *) (addr))[0] << 8                            \
 169         | ((__const unsigned char *) (addr))[1]) << 8                         \
 170        | ((__const unsigned char *) (addr))[2]) << 8                          \
 171       | ((__const unsigned char *) (addr))[3])
 172
 173 #  define put16u(addr, val) \
 174      ({ uint16_t __val = (val);                                               \
 175         ((unsigned char *) (addr))[1] = __val;                                \
 176         ((unsigned char *) (addr))[0] = __val >> 8;                           \
 177         (void) 0; })
 178 #  define put32u(addr, val) \
 179      ({ uint32_t __val = (val);                                               \
 180         ((unsigned char *) (addr))[3] = __val;                                \
 181         __val >>= 8;                                                          \
 182         ((unsigned char *) (addr))[2] = __val;                                \
 183         __val >>= 8;                                                          \
 184         ((unsigned char *) (addr))[1] = __val;                                \
 185         __val >>= 8;                                                          \
 186         ((unsigned char *) (addr))[0] = __val;                                \
 187         (void) 0; })
 188 # endif
 189 #endif
 190
 191
 192 /* For conversions from a fixed width character set to another fixed width
 193    character set we can define RESET_INPUT_BUFFER in a very fast way.  */
 194 #if !defined RESET_INPUT_BUFFER && !defined SAVE_RESET_STATE
 195 # if MIN_NEEDED_FROM == MAX_NEEDED_FROM && MIN_NEEDED_TO == MAX_NEEDED_TO
 196 /* We have to use these `if's here since the compiler cannot know that
 197    (outbuf - outerr) is always divisible by MIN_NEEDED_TO.  */
 198 #  define RESET_INPUT_BUFFER \
 199   if (MIN_NEEDED_FROM % MIN_NEEDED_TO == 0)                                   \
 200     *inptrp -= (outbuf - outerr) * (MIN_NEEDED_FROM / MIN_NEEDED_TO);         \
 201   else if (MIN_NEEDED_TO % MIN_NEEDED_FROM == 0)                              \
 202     *inptrp -= (outbuf - outerr) / (MIN_NEEDED_TO / MIN_NEEDED_FROM);         \
 203   else                                                                        \
 204     *inptrp -= ((outbuf - outerr) / MIN_NEEDED_TO) * MIN_NEEDED_FROM
 205 # endif
 206 #endif
 207
 208
 209 /* The default init function.  It simply matches the name and initializes
 210    the step data to point to one of the objects above.  */
 211 #if DEFINE_INIT
 212 # ifndef CHARSET_NAME
 213 #  error "CHARSET_NAME not defined"
 214 # endif
 215
 216 extern int gconv_init (struct __gconv_step *step);
 217 int
 218 gconv_init (struct __gconv_step *step)
 219 {
 220   /* Determine which direction.  */
 221   if (strcmp (step->__from_name, CHARSET_NAME) == 0)
 222     {
 223       step->__data = &from_object;
 224
 225       step->__min_needed_from = MIN_NEEDED_FROM;
 226       step->__max_needed_from = MAX_NEEDED_FROM;
 227       step->__min_needed_to = MIN_NEEDED_TO;
 228       step->__max_needed_to = MAX_NEEDED_TO;
 229     }
 230   else if (__builtin_expect (strcmp (step->__to_name, CHARSET_NAME), 0) == 0)
 231     {
 232       step->__data = &to_object;
 233
 234       step->__min_needed_from = MIN_NEEDED_TO;
 235       step->__max_needed_from = MAX_NEEDED_TO;
 236       step->__min_needed_to = MIN_NEEDED_FROM;
 237       step->__max_needed_to = MAX_NEEDED_FROM;
 238     }
 239   else
 240     return __GCONV_NOCONV;
 241
 242 #ifdef SAVE_RESET_STATE
 243   step->__stateful = 1;
 244 #else
 245   step->__stateful = 0;
 246 #endif
 247
 248   return __GCONV_OK;
 249 }
 250 #endif
 251
 252
 253 /* The default destructor function does nothing in the moment and so
 254    we don't define it at all.  But we still provide the macro just in
 255    case we need it some day.  */
 256 #if DEFINE_FINI
 257 #endif
 258
 259
 260 /* If no arguments have to passed to the loop function define the macro
 261    as empty.  */
 262 #ifndef EXTRA_LOOP_ARGS
 263 # define EXTRA_LOOP_ARGS
 264 #endif
 265
 266
 267 /* This is the actual conversion function.  */
 268 #ifndef FUNCTION_NAME
 269 # define FUNCTION_NAME  gconv
 270 #endif
 271
 272 /* The macros are used to access the function to convert single characters.  */
 273 #define SINGLE(fct) SINGLE2 (fct)
 274 #define SINGLE2(fct) fct##_single
 275
 276
 277 extern int FUNCTION_NAME (struct __gconv_step *step,
 278                           struct __gconv_step_data *data,
 279                           const unsigned char **inptrp,
 280                           const unsigned char *inend,
 281                           unsigned char **outbufstart, size_t *irreversible,
 282                           int do_flush, int consume_incomplete);
 283 int
 284 FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
 285                const unsigned char **inptrp, const unsigned char *inend,
 286                unsigned char **outbufstart, size_t *irreversible, int do_flush,
 287                int consume_incomplete)
 288 {
 289   struct __gconv_step *next_step = step + 1;
 290   struct __gconv_step_data *next_data = data + 1;
 291   __gconv_fct fct;
 292   int status;
 293
 294   fct = (data->__flags & __GCONV_IS_LAST) ? NULL : next_step->__fct;
 295
 296   /* If the function is called with no input this means we have to reset
 297      to the initial state.  The possibly partly converted input is
 298      dropped.  */
 299   if (__builtin_expect (do_flush, 0))
 300     {
 301       /* This should never happen during error handling.  */
 302       assert (outbufstart == NULL);
 303
 304       status = __GCONV_OK;
 305
 306 #ifdef EMIT_SHIFT_TO_INIT
 307       if (do_flush == 1)
 308         {
 309           /* We preserve the initial values of the pointer variables.  */
 310           unsigned char *outbuf = data->__outbuf;
 311           unsigned char *outstart = outbuf;
 312           unsigned char *outend = data->__outbufend;
 313
 314 # ifdef PREPARE_LOOP
 315           PREPARE_LOOP
 316 # endif
 317
 318 # ifdef SAVE_RESET_STATE
 319           SAVE_RESET_STATE (1);
 320 # endif
 321
 322           /* Emit the escape sequence to reset the state.  */
 323           EMIT_SHIFT_TO_INIT;
 324
 325           /* Call the steps down the chain if there are any but only if we
 326              successfully emitted the escape sequence.  This should only
 327              fail if the output buffer is full.  If the input is invalid
 328              it should be discarded since the user wants to start from a
 329              clean state.  */
 330           if (status == __GCONV_OK)
 331             {
 332               if (data->__flags & __GCONV_IS_LAST)
 333                 /* Store information about how many bytes are available.  */
 334                 data->__outbuf = outbuf;
 335               else
 336                 {
 337                   /* Write out all output which was produced.  */
 338                   if (outbuf > outstart)
 339                     {
 340                       const unsigned char *outerr = outstart;
 341                       int result;
 342
 343                       result = DL_CALL_FCT (fct, (next_step, next_data,
 344                                                   &outerr, outbuf, NULL,
 345                                                   irreversible, 0,
 346                                                   consume_incomplete));
 347
 348                       if (result != __GCONV_EMPTY_INPUT)
 349                         {
 350                           if (__builtin_expect (outerr != outbuf, 0))
 351                             {
 352                               /* We have a problem.  Undo the conversion.  */
 353                               outbuf = outstart;
 354
 355                               /* Restore the state.  */
 356 # ifdef SAVE_RESET_STATE
 357                               SAVE_RESET_STATE (0);
 358 # endif
 359                             }
 360
 361                           /* Change the status.  */
 362                           status = result;
 363                         }
 364                     }
 365
 366                   if (status == __GCONV_OK)
 367                     /* Now flush the remaining steps.  */
 368                     status = DL_CALL_FCT (fct, (next_step, next_data, NULL,
 369                                                 NULL, NULL, irreversible, 1,
 370                                                 consume_incomplete));
 371                 }
 372             }
 373         }
 374       else
 375 #endif
 376         {
 377           /* Clear the state object.  There might be bytes in there from
 378              previous calls with CONSUME_INCOMPLETE == 1.  But don't emit
 379              escape sequences.  */
 380           memset (data->__statep, '\0', sizeof (*data->__statep));
 381
 382           if (! (data->__flags & __GCONV_IS_LAST))
 383             /* Now flush the remaining steps.  */
 384             status = DL_CALL_FCT (fct, (next_step, next_data, NULL, NULL,
 385                                         NULL, irreversible, do_flush,
 386                                         consume_incomplete));
 387         }
 388     }
 389   else
 390     {
 391       /* We preserve the initial values of the pointer variables.  */
 392       const unsigned char *inptr = *inptrp;
 393       unsigned char *outbuf = (__builtin_expect (outbufstart == NULL, 1)
 394                                ? data->__outbuf : *outbufstart);
 395       unsigned char *outend = data->__outbufend;
 396       unsigned char *outstart;
 397       /* This variable is used to count the number of characters we
 398          actually converted.  */
 399       size_t lirreversible = 0;
 400       size_t *lirreversiblep = irreversible ? &lirreversible : NULL;
 401 #if defined _STRING_ARCH_unaligned \
 402     || MIN_NEEDED_FROM == 1 || MAX_NEEDED_FROM % MIN_NEEDED_FROM != 0 \
 403     || MIN_NEEDED_TO == 1 || MAX_NEEDED_TO % MIN_NEEDED_TO != 0
 404 # define unaligned 0
 405 #else
 406       int unaligned;
 407 # define GEN_unaligned(name) GEN_unaligned2 (name)
 408 # define GEN_unaligned2(name) name##_unaligned
 409 #endif
 410
 411 #ifdef PREPARE_LOOP
 412       PREPARE_LOOP
 413 #endif
 414
 415 #if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1
 416       /* If the function is used to implement the mb*towc*() or wc*tomb*()
 417          functions we must test whether any bytes from the last call are
 418          stored in the `state' object.  */
 419       if (((MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1)
 420            || (MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
 421            || (MAX_NEEDED_TO > 1 && !FROM_DIRECTION))
 422           && consume_incomplete && (data->__statep->__count & 7) != 0)
 423         {
 424           /* Yep, we have some bytes left over.  Process them now.
 425              But this must not happen while we are called from an
 426              error handler.  */
 427           assert (outbufstart == NULL);
 428
 429 # if MAX_NEEDED_FROM > 1
 430           if (MAX_NEEDED_TO == 1 || FROM_DIRECTION)
 431             status = SINGLE(FROM_LOOP) (step, data, inptrp, inend, &outbuf,
 432                                         outend, lirreversiblep
 433                                         EXTRA_LOOP_ARGS);
 434 # endif
 435 # if MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1 && !ONE_DIRECTION
 436           else
 437 # endif
 438 # if MAX_NEEDED_TO > 1 && !ONE_DIRECTION
 439             status = SINGLE(TO_LOOP) (step, data, inptrp, inend, &outbuf,
 440                                       outend, lirreversiblep EXTRA_LOOP_ARGS);
 441 # endif
 442
 443           if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
 444             return status;
 445         }
 446 #endif
 447
 448 #if !defined _STRING_ARCH_unaligned \
 449     && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
 450     && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
 451       /* The following assumes that encodings, which have a variable length
 452          what might unalign a buffer even though it is a aligned in the
 453          beginning, either don't have the minimal number of bytes as a divisor
 454          of the maximum length or have a minimum length of 1.  This is true
 455          for all known and supported encodings.  */
 456       unaligned = ((FROM_DIRECTION
 457                     && ((uintptr_t) inptr % MIN_NEEDED_FROM != 0
 458                         || ((data->__flags & __GCONV_IS_LAST)
 459                             && (uintptr_t) outbuf % MIN_NEEDED_TO != 0)))
 460                    || (!FROM_DIRECTION
 461                        && (((data->__flags & __GCONV_IS_LAST)
 462                             && (uintptr_t) outbuf % MIN_NEEDED_FROM != 0)
 463                            || (uintptr_t) inptr % MIN_NEEDED_TO != 0)));
 464 #endif
 465
 466       while (1)
 467         {
 468           struct __gconv_trans_data *trans;
 469
 470           /* Remember the start value for this round.  */
 471           inptr = *inptrp;
 472           /* The outbuf buffer is empty.  */
 473           outstart = outbuf;
 474
 475 #ifdef SAVE_RESET_STATE
 476           SAVE_RESET_STATE (1);
 477 #endif
 478
 479           if (__builtin_expect (!unaligned, 1))
 480             {
 481               if (FROM_DIRECTION)
 482                 /* Run the conversion loop.  */
 483                 status = FROM_LOOP (step, data, inptrp, inend, &outbuf, outend,
 484                                     lirreversiblep EXTRA_LOOP_ARGS);
 485               else
 486                 /* Run the conversion loop.  */
 487                 status = TO_LOOP (step, data, inptrp, inend, &outbuf, outend,
 488                                   lirreversiblep EXTRA_LOOP_ARGS);
 489             }
 490 #if !defined _STRING_ARCH_unaligned \
 491     && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
 492     && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
 493           else
 494             {
 495               if (FROM_DIRECTION)
 496                 /* Run the conversion loop.  */
 497                 status = GEN_unaligned (FROM_LOOP) (step, data, inptrp, inend,
 498                                                     &outbuf, outend,
 499                                                     lirreversiblep
 500                                                     EXTRA_LOOP_ARGS);
 501               else
 502                 /* Run the conversion loop.  */
 503                 status = GEN_unaligned (TO_LOOP) (step, data, inptrp, inend,
 504                                                   &outbuf, outend,
 505                                                   lirreversiblep
 506                                                   EXTRA_LOOP_ARGS);
 507             }
 508 #endif
 509
 510           /* If we were called as part of an error handling module we
 511              don't do anything else here.  */
 512           if (__builtin_expect (outbufstart != NULL, 0))
 513             {
 514               *outbufstart = outbuf;
 515               return status;
 516             }
 517
 518           /* Give the transliteration module the chance to store the
 519              original text and the result in case it needs a context.  */
 520           for (trans = data->__trans; trans != NULL; trans = trans->__next)
 521             if (trans->__trans_context_fct != NULL)
 522               DL_CALL_FCT (trans->__trans_context_fct,
 523                            (trans->__data, inptr, *inptrp, outstart, outbuf));
 524
 525           /* We finished one use of the loops.  */
 526           ++data->__invocation_counter;
 527
 528           /* If this is the last step leave the loop, there is nothing
 529              we can do.  */
 530           if (__builtin_expect (data->__flags & __GCONV_IS_LAST, 0))
 531             {
 532               /* Store information about how many bytes are available.  */
 533               data->__outbuf = outbuf;
 534
 535               /* Remember how many non-identical characters we
 536                  converted in a irreversible way.  */
 537               *irreversible += lirreversible;
 538
 539               break;
 540             }
 541
 542           /* Write out all output which was produced.  */
 543           if (__builtin_expect (outbuf > outstart, 1))
 544             {
 545               const unsigned char *outerr = data->__outbuf;
 546               int result;
 547
 548               result = DL_CALL_FCT (fct, (next_step, next_data, &outerr,
 549                                           outbuf, NULL, irreversible, 0,
 550                                           consume_incomplete));
 551
 552               if (result != __GCONV_EMPTY_INPUT)
 553                 {
 554                   if (__builtin_expect (outerr != outbuf, 0))
 555                     {
 556 #ifdef RESET_INPUT_BUFFER
 557                       RESET_INPUT_BUFFER;
 558 #else
 559                       /* We have a problem with the in on of the functions
 560                          below.  Undo the conversion upto the error point.  */
 561                       size_t nstatus;
 562
 563                       /* Reload the pointers.  */
 564                       *inptrp = inptr;
 565                       outbuf = outstart;
 566
 567                       /* Restore the state.  */
 568 # ifdef SAVE_RESET_STATE
 569                       SAVE_RESET_STATE (0);
 570 # endif
 571
 572                       if (__builtin_expect (!unaligned, 1))
 573                         {
 574                           if (FROM_DIRECTION)
 575                             /* Run the conversion loop.  */
 576                             nstatus = FROM_LOOP (step, data, inptrp, inend,
 577                                                  &outbuf, outerr,
 578                                                  lirreversiblep
 579                                                  EXTRA_LOOP_ARGS);
 580                           else
 581                             /* Run the conversion loop.  */
 582                             nstatus = TO_LOOP (step, data, inptrp, inend,
 583                                                &outbuf, outerr,
 584                                                lirreversiblep
 585                                                EXTRA_LOOP_ARGS);
 586                         }
 587 # if !defined _STRING_ARCH_unaligned \
 588      && MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
 589      && MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
 590                       else
 591                         {
 592                           if (FROM_DIRECTION)
 593                             /* Run the conversion loop.  */
 594                             nstatus = GEN_unaligned (FROM_LOOP) (step, data,
 595                                                                  inptrp, inend,
 596                                                                  &outbuf,
 597                                                                  outerr,
 598                                                                  lirreversiblep
 599                                                                  EXTRA_LOOP_ARGS);
 600                           else
 601                             /* Run the conversion loop.  */
 602                             nstatus = GEN_unaligned (TO_LOOP) (step, data,
 603                                                                inptrp, inend,
 604                                                                &outbuf, outerr,
 605                                                                lirreversiblep
 606                                                                EXTRA_LOOP_ARGS);
 607                         }
 608 # endif
 609
 610                       /* We must run out of output buffer space in this
 611                          rerun.  */
 612                       assert (outbuf == outerr);
 613                       assert (nstatus == __GCONV_FULL_OUTPUT);
 614
 615                       /* If we haven't consumed a single byte decrement
 616                          the invocation counter.  */
 617                       if (__builtin_expect (outbuf == outstart, 0))
 618                         --data->__invocation_counter;
 619 #endif  /* reset input buffer */
 620                     }
 621
 622                   /* Change the status.  */
 623                   status = result;
 624                 }
 625               else
 626                 /* All the output is consumed, we can make another run
 627                    if everything was ok.  */
 628                 if (status == __GCONV_FULL_OUTPUT)
 629                   {
 630                     status = __GCONV_OK;
 631                     outbuf = data->__outbuf;
 632                   }
 633             }
 634
 635           if (status != __GCONV_OK)
 636             break;
 637
 638           /* Reset the output buffer pointer for the next round.  */
 639           outbuf = data->__outbuf;
 640         }
 641
 642 #ifdef END_LOOP
 643       END_LOOP
 644 #endif
 645
 646       /* If we are supposed to consume all character store now all of the
 647          remaining characters in the `state' object.  */
 648 #if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1
 649       if (((MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1)
 650            || (MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
 651            || (MAX_NEEDED_TO > 1 && !FROM_DIRECTION))
 652           && __builtin_expect (consume_incomplete, 0)
 653           && status == __GCONV_INCOMPLETE_INPUT)
 654         {
 655 # ifdef STORE_REST
 656           mbstate_t *state = data->__statep;
 657
 658           STORE_REST
 659 # else
 660           size_t cnt;
 661
 662           /* Make sure the remaining bytes fit into the state objects
 663              buffer.  */
 664           assert (inend - *inptrp < 4);
 665
 666           for (cnt = 0; *inptrp < inend; ++cnt)
 667             data->__statep->__value.__wchb[cnt] = *(*inptrp)++;
 668           data->__statep->__count &= ~7;
 669           data->__statep->__count |= cnt;
 670 # endif
 671         }
 672 #endif
 673     }
 674
 675   return status;
 676 }
 677
 678 #undef DEFINE_INIT
 679 #undef CHARSET_NAME
 680 #undef DEFINE_FINI
 681 #undef MIN_NEEDED_FROM
 682 #undef MIN_NEEDED_TO
 683 #undef MAX_NEEDED_FROM
 684 #undef MAX_NEEDED_TO
 685 #undef DEFINE_DIRECTION_OBJECTS
 686 #undef FROM_DIRECTION
 687 #undef EMIT_SHIFT_TO_INIT
 688 #undef FROM_LOOP
 689 #undef TO_LOOP
 690 #undef SAVE_RESET_STATE
 691 #undef RESET_INPUT_BUFFER
 692 #undef FUNCTION_NAME
 693 #undef PREPARE_LOOP
 694 #undef END_LOOP
 695 #undef ONE_DIRECTION
 696 #undef STORE_REST