1 /* $Id: dba_array.c,v 1.1 2016/07/19 21:31:55 schwarze Exp $ */ 2 /* 3 * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 * 17 * Allocation-based arrays for the mandoc database, for read-write access. 18 * The interface is defined in "dba_array.h". 19 */ 20 #include <assert.h> 21 #include <stdint.h> 22 #include <stdlib.h> 23 #include <string.h> 24 25 #include "mandoc_aux.h" 26 #include "dba_write.h" 27 #include "dba_array.h" 28 29 struct dba_array { 30 void **ep; /* Array of entries. */ 31 int32_t *em; /* Array of map positions. */ 32 int flags; 33 int32_t ea; /* Entries allocated. */ 34 int32_t eu; /* Entries used (including deleted). */ 35 int32_t ed; /* Entries deleted. */ 36 int32_t ec; /* Currently active entry. */ 37 int32_t pos; /* Map position of this array. */ 38 }; 39 40 41 struct dba_array * 42 dba_array_new(int32_t ea, int flags) 43 { 44 struct dba_array *array; 45 46 assert(ea > 0); 47 array = mandoc_malloc(sizeof(*array)); 48 array->ep = mandoc_reallocarray(NULL, ea, sizeof(*array->ep)); 49 array->em = mandoc_reallocarray(NULL, ea, sizeof(*array->em)); 50 array->ea = ea; 51 array->eu = 0; 52 array->ed = 0; 53 array->ec = 0; 54 array->flags = flags; 55 array->pos = 0; 56 return array; 57 } 58 59 void 60 dba_array_free(struct dba_array *array) 61 { 62 int32_t ie; 63 64 if (array == NULL) 65 return; 66 if (array->flags & DBA_STR) 67 for (ie = 0; ie < array->eu; ie++) 68 free(array->ep[ie]); 69 free(array->ep); 70 free(array->em); 71 free(array); 72 } 73 74 void 75 dba_array_set(struct dba_array *array, int32_t ie, void *entry) 76 { 77 assert(ie >= 0); 78 assert(ie < array->ea); 79 assert(ie <= array->eu); 80 if (ie == array->eu) 81 array->eu++; 82 if (array->flags & DBA_STR) 83 entry = mandoc_strdup(entry); 84 array->ep[ie] = entry; 85 array->em[ie] = 0; 86 } 87 88 void 89 dba_array_add(struct dba_array *array, void *entry) 90 { 91 if (array->eu == array->ea) { 92 assert(array->flags & DBA_GROW); 93 array->ep = mandoc_reallocarray(array->ep, 94 2, sizeof(*array->ep) * array->ea); 95 array->em = mandoc_reallocarray(array->em, 96 2, sizeof(*array->em) * array->ea); 97 array->ea *= 2; 98 } 99 dba_array_set(array, array->eu, entry); 100 } 101 102 void * 103 dba_array_get(struct dba_array *array, int32_t ie) 104 { 105 if (ie < 0 || ie >= array->eu || array->em[ie] == -1) 106 return NULL; 107 return array->ep[ie]; 108 } 109 110 void 111 dba_array_start(struct dba_array *array) 112 { 113 array->ec = array->eu; 114 } 115 116 void * 117 dba_array_next(struct dba_array *array) 118 { 119 if (array->ec < array->eu) 120 array->ec++; 121 else 122 array->ec = 0; 123 while (array->ec < array->eu && array->em[array->ec] == -1) 124 array->ec++; 125 return array->ec < array->eu ? array->ep[array->ec] : NULL; 126 } 127 128 void 129 dba_array_del(struct dba_array *array) 130 { 131 if (array->ec < array->eu && array->em[array->ec] != -1) { 132 array->em[array->ec] = -1; 133 array->ed++; 134 } 135 } 136 137 void 138 dba_array_undel(struct dba_array *array) 139 { 140 memset(array->em, 0, sizeof(*array->em) * array->eu); 141 } 142 143 void 144 dba_array_setpos(struct dba_array *array, int32_t ie, int32_t pos) 145 { 146 array->em[ie] = pos; 147 } 148 149 int32_t 150 dba_array_getpos(struct dba_array *array) 151 { 152 return array->pos; 153 } 154 155 void 156 dba_array_sort(struct dba_array *array, dba_compare_func func) 157 { 158 assert(array->ed == 0); 159 qsort(array->ep, array->eu, sizeof(*array->ep), func); 160 } 161 162 int32_t 163 dba_array_writelen(struct dba_array *array, int32_t nmemb) 164 { 165 dba_int_write(array->eu - array->ed); 166 return dba_skip(nmemb, array->eu - array->ed); 167 } 168 169 void 170 dba_array_writepos(struct dba_array *array) 171 { 172 int32_t ie; 173 174 array->pos = dba_tell(); 175 for (ie = 0; ie < array->eu; ie++) 176 if (array->em[ie] != -1) 177 dba_int_write(array->em[ie]); 178 } 179 180 void 181 dba_array_writelst(struct dba_array *array) 182 { 183 const char *str; 184 185 dba_array_FOREACH(array, str) 186 dba_str_write(str); 187 dba_char_write('\0'); 188 } 189