1 /* $NetBSD: str.c,v 1.101 2023/12/17 22:46:44 rillig Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Adam de Boor. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 1989 by Berkeley Softworks 37 * All rights reserved. 38 * 39 * This code is derived from software contributed to Berkeley by 40 * Adam de Boor. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 */ 70 71 #include "make.h" 72 73 /* "@(#)str.c 5.8 (Berkeley) 6/1/90" */ 74 MAKE_RCSID("$NetBSD: str.c,v 1.101 2023/12/17 22:46:44 rillig Exp $"); 75 76 77 static HashTable interned_strings; 78 79 80 /* Return the concatenation of s1 and s2, freshly allocated. */ 81 char * 82 str_concat2(const char *s1, const char *s2) 83 { 84 size_t len1 = strlen(s1); 85 size_t len2 = strlen(s2); 86 char *result = bmake_malloc(len1 + len2 + 1); 87 memcpy(result, s1, len1); 88 memcpy(result + len1, s2, len2 + 1); 89 return result; 90 } 91 92 /* Return the concatenation of s1, s2 and s3, freshly allocated. */ 93 char * 94 str_concat3(const char *s1, const char *s2, const char *s3) 95 { 96 size_t len1 = strlen(s1); 97 size_t len2 = strlen(s2); 98 size_t len3 = strlen(s3); 99 char *result = bmake_malloc(len1 + len2 + len3 + 1); 100 memcpy(result, s1, len1); 101 memcpy(result + len1, s2, len2); 102 memcpy(result + len1 + len2, s3, len3 + 1); 103 return result; 104 } 105 106 /* 107 * Fracture a string into an array of words (as delineated by tabs or spaces) 108 * taking quotation marks into account. 109 * 110 * If expand is true, quotes are removed and escape sequences such as \r, \t, 111 * etc... are expanded. In this case, return NULL on parse errors. 112 * 113 * Returns the fractured words, which must be freed later using Words_Free, 114 * unless the returned Words.words was NULL. 115 */ 116 SubstringWords 117 Substring_Words(const char *str, bool expand) 118 { 119 size_t str_len; 120 char *words_buf; 121 size_t words_cap; 122 Substring *words; 123 size_t words_len; 124 char inquote; 125 char *word_start; 126 char *word_end; 127 const char *str_p; 128 129 /* XXX: why only hspace, not whitespace? */ 130 cpp_skip_hspace(&str); /* skip leading space chars. */ 131 132 /* words_buf holds the words, separated by '\0'. */ 133 str_len = strlen(str); 134 words_buf = bmake_malloc(str_len + 1); 135 136 words_cap = str_len / 5 > 50 ? str_len / 5 : 50; 137 words = bmake_malloc((words_cap + 1) * sizeof(words[0])); 138 139 /* 140 * copy the string; at the same time, parse backslashes, 141 * quotes and build the word list. 142 */ 143 words_len = 0; 144 inquote = '\0'; 145 word_start = words_buf; 146 word_end = words_buf; 147 for (str_p = str;; str_p++) { 148 char ch = *str_p; 149 switch (ch) { 150 case '"': 151 case '\'': 152 if (inquote != '\0') { 153 if (inquote == ch) 154 inquote = '\0'; 155 else 156 break; 157 } else { 158 inquote = ch; 159 /* Don't miss "" or '' */ 160 if (word_start == NULL && str_p[1] == inquote) { 161 if (!expand) { 162 word_start = word_end; 163 *word_end++ = ch; 164 } else 165 word_start = word_end + 1; 166 str_p++; 167 inquote = '\0'; 168 break; 169 } 170 } 171 if (!expand) { 172 if (word_start == NULL) 173 word_start = word_end; 174 *word_end++ = ch; 175 } 176 continue; 177 case ' ': 178 case '\t': 179 case '\n': 180 if (inquote != '\0') 181 break; 182 if (word_start == NULL) 183 continue; 184 /* FALLTHROUGH */ 185 case '\0': 186 /* 187 * end of a token -- make sure there's enough words 188 * space and save off a pointer. 189 */ 190 if (word_start == NULL) 191 goto done; 192 193 *word_end++ = '\0'; 194 if (words_len == words_cap) { 195 words_cap *= 2; 196 words = bmake_realloc(words, 197 (words_cap + 1) * sizeof(words[0])); 198 } 199 words[words_len++] = 200 Substring_Init(word_start, word_end - 1); 201 word_start = NULL; 202 if (ch == '\n' || ch == '\0') { 203 if (expand && inquote != '\0') { 204 SubstringWords res; 205 206 free(words); 207 free(words_buf); 208 209 res.words = NULL; 210 res.len = 0; 211 res.freeIt = NULL; 212 return res; 213 } 214 goto done; 215 } 216 continue; 217 case '\\': 218 if (!expand) { 219 if (word_start == NULL) 220 word_start = word_end; 221 *word_end++ = '\\'; 222 /* catch lonely '\' at end of string */ 223 if (str_p[1] == '\0') 224 continue; 225 ch = *++str_p; 226 break; 227 } 228 229 switch (ch = *++str_p) { 230 case '\0': 231 case '\n': 232 /* hmmm; fix it up as best we can */ 233 ch = '\\'; 234 str_p--; 235 break; 236 case 'b': 237 ch = '\b'; 238 break; 239 case 'f': 240 ch = '\f'; 241 break; 242 case 'n': 243 ch = '\n'; 244 break; 245 case 'r': 246 ch = '\r'; 247 break; 248 case 't': 249 ch = '\t'; 250 break; 251 } 252 break; 253 } 254 if (word_start == NULL) 255 word_start = word_end; 256 *word_end++ = ch; 257 } 258 done: 259 words[words_len] = Substring_Init(NULL, NULL); /* useful for argv */ 260 261 { 262 SubstringWords result; 263 264 result.words = words; 265 result.len = words_len; 266 result.freeIt = words_buf; 267 return result; 268 } 269 } 270 271 Words 272 Str_Words(const char *str, bool expand) 273 { 274 SubstringWords swords; 275 Words words; 276 size_t i; 277 278 swords = Substring_Words(str, expand); 279 if (swords.words == NULL) { 280 words.words = NULL; 281 words.len = 0; 282 words.freeIt = NULL; 283 return words; 284 } 285 286 words.words = bmake_malloc((swords.len + 1) * sizeof(words.words[0])); 287 words.len = swords.len; 288 words.freeIt = swords.freeIt; 289 for (i = 0; i < swords.len + 1; i++) 290 words.words[i] = UNCONST(swords.words[i].start); 291 free(swords.words); 292 return words; 293 } 294 295 /* 296 * XXX: In the extreme edge case that one of the characters is from the basic 297 * execution character set and the other isn't, the result of the comparison 298 * differs depending on whether plain char is signed or unsigned. 299 * 300 * An example is the character range from \xE4 to 'a', where \xE4 may come 301 * from U+00E4 'Latin small letter A with diaeresis'. 302 * 303 * If char is signed, \xE4 evaluates to -28, the first half of the condition 304 * becomes -28 <= '0' && '0' <= 'a', which evaluates to true. 305 * 306 * If char is unsigned, \xE4 evaluates to 228, the second half of the 307 * condition becomes 'a' <= '0' && '0' <= 228, which evaluates to false. 308 */ 309 static bool 310 in_range(char e1, char c, char e2) 311 { 312 return (e1 <= c && c <= e2) || (e2 <= c && c <= e1); 313 } 314 315 /* 316 * Test if a string matches a pattern like "*.[ch]". The pattern matching 317 * characters are '*', '?' and '[]', as in fnmatch(3). 318 * 319 * See varmod-match.mk for examples and edge cases. 320 */ 321 StrMatchResult 322 Str_Match(const char *str, const char *pat) 323 { 324 StrMatchResult res = { NULL, false }; 325 bool asterisk = false; 326 const char *fixed_str = str; 327 const char *fixed_pat = pat; 328 329 match_fixed_length: 330 str = fixed_str; 331 pat = fixed_pat; 332 for (; *pat != '\0' && *pat != '*'; str++, pat++) { 333 if (*str == '\0') 334 return res; 335 336 if (*pat == '?') /* match any single character */ 337 continue; 338 339 if (*pat == '[') { /* match a character from a list */ 340 bool neg = pat[1] == '^'; 341 pat += neg ? 2 : 1; 342 343 next_char_in_list: 344 if (*pat == '\0') 345 res.error = "Unfinished character list"; 346 if (*pat == ']' || *pat == '\0') { 347 if (neg) 348 goto end_of_char_list; 349 goto no_match; 350 } 351 if (*pat == *str) 352 goto end_of_char_list; 353 if (pat[1] == '-' && pat[2] == '\0') { 354 res.error = "Unfinished character range"; 355 res.matched = neg; 356 return res; 357 } 358 if (pat[1] == '-') { 359 if (in_range(pat[0], *str, pat[2])) 360 goto end_of_char_list; 361 pat += 2; 362 } 363 pat++; 364 goto next_char_in_list; 365 366 end_of_char_list: 367 if (neg && *pat != ']' && *pat != '\0') 368 goto no_match; 369 while (*pat != ']' && *pat != '\0') 370 pat++; 371 if (*pat == '\0') 372 pat--; 373 continue; 374 } 375 376 if (*pat == '\\') /* match the next character exactly */ 377 pat++; 378 if (*pat != *str) { 379 if (asterisk && str == fixed_str) { 380 while (*str != '\0' && *str != *pat) 381 str++; 382 fixed_str = str; 383 goto match_fixed_length; 384 } 385 goto no_match; 386 } 387 } 388 389 if (*pat == '*') { 390 asterisk = true; 391 while (*pat == '*') 392 pat++; 393 if (*pat == '\0') { 394 res.matched = true; 395 return res; 396 } 397 fixed_str = str; 398 fixed_pat = pat; 399 goto match_fixed_length; 400 } 401 if (asterisk && *str != '\0') { 402 fixed_str += strlen(str); 403 goto match_fixed_length; 404 } 405 res.matched = *str == '\0'; 406 return res; 407 408 no_match: 409 if (!asterisk) 410 return res; 411 fixed_str++; 412 goto match_fixed_length; 413 } 414 415 void 416 Str_Intern_Init(void) 417 { 418 HashTable_Init(&interned_strings); 419 } 420 421 void 422 Str_Intern_End(void) 423 { 424 #ifdef CLEANUP 425 HashTable_Done(&interned_strings); 426 #endif 427 } 428 429 /* Return a canonical instance of str, with unlimited lifetime. */ 430 const char * 431 Str_Intern(const char *str) 432 { 433 return HashTable_CreateEntry(&interned_strings, str, NULL)->key; 434 } 435