1 /*
   2  * Copyright © 2017  Google, Inc.
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  *
  24  * Google Author(s): Behdad Esfahbod
  25  */
  26 
  27 #ifndef HB_STRING_ARRAY_HH
  28 #if 0 /* Make checks happy. */
  29 #define HB_STRING_ARRAY_HH
  30 #endif
  31 
  32 #include "hb.hh"
  33 
  34 /* Based on Bruno Haible's code in Appendix B of Ulrich Drepper's dsohowto.pdf:
  35  * https://software.intel.com/sites/default/files/m/a/1/e/dsohowto.pdf */
  36 
  37 #define HB_STRING_ARRAY_TYPE_NAME       HB_PASTE(HB_STRING_ARRAY_NAME, _msgstr_t)
  38 #define HB_STRING_ARRAY_POOL_NAME       HB_PASTE(HB_STRING_ARRAY_NAME, _msgstr)
  39 #define HB_STRING_ARRAY_OFFS_NAME       HB_PASTE(HB_STRING_ARRAY_NAME, _msgidx)
  40 
  41 static const union HB_STRING_ARRAY_TYPE_NAME {
  42   struct {
  43 /* I like to avoid storing the nul-termination byte since we don't need it,
  44  * but C++ does not allow that.
  45  * https://stackoverflow.com/q/28433862
  46  */
  47 #define _S(s) char HB_PASTE (str, __LINE__)[sizeof (s)];
  48 #include HB_STRING_ARRAY_LIST
  49 #undef _S
  50   } st;
  51   char str[VAR];
  52 }
  53 HB_STRING_ARRAY_POOL_NAME =
  54 {
  55   {
  56 #define _S(s) s,
  57 #include HB_STRING_ARRAY_LIST
  58 #undef _S
  59   }
  60 };
  61 static const unsigned int HB_STRING_ARRAY_OFFS_NAME[] =
  62 {
  63 #define _S(s) offsetof (union HB_STRING_ARRAY_TYPE_NAME, st.HB_PASTE(str, __LINE__)),
  64 #include HB_STRING_ARRAY_LIST
  65 #undef _S
  66   sizeof (HB_STRING_ARRAY_TYPE_NAME)
  67 };
  68 
  69 static inline hb_bytes_t
  70 HB_STRING_ARRAY_NAME (unsigned int i)
  71 {
  72   assert (i < ARRAY_LENGTH (HB_STRING_ARRAY_OFFS_NAME) - 1);
  73   return hb_bytes_t (HB_STRING_ARRAY_POOL_NAME.str + HB_STRING_ARRAY_OFFS_NAME[i],
  74                      HB_STRING_ARRAY_OFFS_NAME[i + 1] - HB_STRING_ARRAY_OFFS_NAME[i] - 1);
  75 }
  76 
  77 #undef HB_STRING_ARRAY_TYPE_NAME
  78 #undef HB_STRING_ARRAY_POOL_NAME
  79 #undef HB_STRING_ARRAY_OFFS_NAME
  80 
  81 #endif /* HB_STRING_ARRAY_HH */