hb-string-array.hh (2925B)
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 #define HB_STRING_ARRAY_LENG_NAME HB_PASTE(HB_STRING_ARRAY_NAME, _length) 41 42 static const union HB_STRING_ARRAY_TYPE_NAME { 43 struct { 44 /* I like to avoid storing the nul-termination byte since we don't need it, 45 * but C++ does not allow that. 46 * https://stackoverflow.com/q/28433862 47 */ 48 #define HB_STR(s) char HB_PASTE (str, __LINE__)[sizeof (s)]; 49 #include HB_STRING_ARRAY_LIST 50 #undef HB_STR 51 } st; 52 char str[HB_VAR_ARRAY]; 53 } 54 HB_STRING_ARRAY_POOL_NAME = 55 { 56 { 57 #define HB_STR(s) s, 58 #include HB_STRING_ARRAY_LIST 59 #undef HB_STR 60 } 61 }; 62 static const unsigned int HB_STRING_ARRAY_OFFS_NAME[] = 63 { 64 #define HB_STR(s) offsetof (union HB_STRING_ARRAY_TYPE_NAME, st.HB_PASTE(str, __LINE__)), 65 #include HB_STRING_ARRAY_LIST 66 #undef HB_STR 67 sizeof (HB_STRING_ARRAY_TYPE_NAME) 68 }; 69 70 static const unsigned int HB_STRING_ARRAY_LENG_NAME = ARRAY_LENGTH_CONST (HB_STRING_ARRAY_OFFS_NAME) - 1; 71 72 static inline hb_bytes_t 73 HB_STRING_ARRAY_NAME (unsigned int i) 74 { 75 assert (i < ARRAY_LENGTH (HB_STRING_ARRAY_OFFS_NAME) - 1); 76 return hb_bytes_t (HB_STRING_ARRAY_POOL_NAME.str + HB_STRING_ARRAY_OFFS_NAME[i], 77 HB_STRING_ARRAY_OFFS_NAME[i + 1] - HB_STRING_ARRAY_OFFS_NAME[i] - 1); 78 } 79 80 #undef HB_STRING_ARRAY_TYPE_NAME 81 #undef HB_STRING_ARRAY_POOL_NAME 82 #undef HB_STRING_ARRAY_OFFS_NAME 83 #undef HB_STRING_ARRAY_LENG_NAME 84 85 #endif /* HB_STRING_ARRAY_HH */