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      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-private.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/questions/28433862/why-initializer-string-for-array-of-chars-is-too-long-compiles-fine-in-c-not
     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_string_t
     70 HB_STRING_ARRAY_NAME (unsigned int i)
     71 {
     72   assert (i < ARRAY_LENGTH (HB_STRING_ARRAY_OFFS_NAME) - 1);
     73   return hb_string_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 */
     82