iconvdata/8bit-gap.c

   1 /* Generic conversion to and from 8bit charsets,
   2    converting from UCS using gaps.
   3    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <dlfcn.h>
  22 #include <stdint.h>
  23
  24 struct gap
  25 {
  26   uint16_t start;
  27   uint16_t end;
  28   int32_t idx;
  29 };
  30
  31 /* Now we can include the tables.  */
  32 #include TABLES
  33
  34 #ifndef NONNUL
  35 # define NONNUL(c)      ((c) != '\0')
  36 #endif
  37
  38
  39 #define FROM_LOOP               from_gap
  40 #define TO_LOOP                 to_gap
  41 #define DEFINE_INIT             1
  42 #define DEFINE_FINI             1
  43 #define MIN_NEEDED_FROM         1
  44 #define MIN_NEEDED_TO           4
  45 #define ONE_DIRECTION           0
  46
  47
  48 /* First define the conversion function from the 8bit charset to UCS4.  */
  49 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
  50 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
  51 #define LOOPFCT                 FROM_LOOP
  52 #define BODY \
  53   {                                                                           \
  54     uint32_t ch = to_ucs4[*inptr];                                            \
  55                                                                               \
  56     if (HAS_HOLES && __builtin_expect (ch == L'\0', 0) && NONNUL (*inptr))    \
  57       {                                                                       \
  58         /* This is an illegal character.  */                                  \
  59         STANDARD_FROM_LOOP_ERR_HANDLER (1);                                   \
  60       }                                                                       \
  61     else                                                                      \
  62       {                                                                       \
  63         put32 (outptr, ch);                                                   \
  64         outptr += 4;                                                          \
  65       }                                                                       \
  66                                                                               \
  67     ++inptr;                                                                  \
  68   }
  69 #define LOOP_NEED_FLAGS
  70 #define ONEBYTE_BODY \
  71   {                                                                           \
  72     uint32_t ch = to_ucs4[c];                                                 \
  73                                                                               \
  74     if (HAS_HOLES && __builtin_expect (ch == L'\0', 0) && NONNUL (c))         \
  75       return WEOF;                                                            \
  76     else                                                                      \
  77       return ch;                                                              \
  78   }
  79 #include <iconv/loop.c>
  80
  81
  82 /* Next, define the other direction.  */
  83 #define MIN_NEEDED_INPUT        MIN_NEEDED_TO
  84 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_FROM
  85 #define LOOPFCT                 TO_LOOP
  86 #define BODY \
  87   {                                                                           \
  88     const struct gap *rp = from_idx;                                          \
  89     uint32_t ch = get32 (inptr);                                              \
  90     unsigned char res;                                                        \
  91                                                                               \
  92     if (__glibc_unlikely (ch >= 0xffff))                                      \
  93       {                                                                       \
  94         UNICODE_TAG_HANDLER (ch, 4);                                          \
  95         rp = NULL;                                                            \
  96       }                                                                       \
  97     else                                                                      \
  98       while (ch > rp->end)                                                    \
  99         ++rp;                                                                 \
 100     if (__builtin_expect (rp == NULL, 0)                                      \
 101         || __builtin_expect (ch < rp->start, 0)                               \
 102         || (res = from_ucs4[ch + rp->idx],                                    \
 103             __builtin_expect (res, '\1') == '\0' && ch != 0))                 \
 104       {                                                                       \
 105         /* This is an illegal character.  */                                  \
 106         STANDARD_TO_LOOP_ERR_HANDLER (4);                                     \
 107       }                                                                       \
 108                                                                               \
 109     *outptr++ = res;                                                          \
 110     inptr += 4;                                                               \
 111   }
 112 #define LOOP_NEED_FLAGS
 113 #include <iconv/loop.c>
 114
 115
 116 /* Now define the toplevel functions.  */
 117 #include <iconv/skeleton.c>