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