tokenizer.c revision 1.24
1 /* $NetBSD: tokenizer.c,v 1.24 2016/02/17 19:47:49 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 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 * Christos Zoulas of Cornell University. 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 #include "config.h" 36 #if !defined(lint) && !defined(SCCSID) 37 #if 0 38 static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: tokenizer.c,v 1.24 2016/02/17 19:47:49 christos Exp $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 44 /* We build this file twice, once as NARROW, once as WIDE. */ 45 /* 46 * tokenize.c: Bourne shell like tokenizer 47 */ 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "histedit.h" 52 #include "chartype.h" 53 54 typedef enum { 55 Q_none, Q_single, Q_double, Q_one, Q_doubleone 56 } quote_t; 57 58 #define TOK_KEEP 1 59 #define TOK_EAT 2 60 61 #define WINCR 20 62 #define AINCR 10 63 64 #define IFS STR("\t \n") 65 66 #define tok_malloc(a) malloc(a) 67 #define tok_free(a) free(a) 68 #define tok_realloc(a, b) realloc(a, b) 69 #define tok_strdup(a) Strdup(a) 70 71 72 struct TYPE(tokenizer) { 73 Char *ifs; /* In field separator */ 74 size_t argc, amax; /* Current and maximum number of args */ 75 Char **argv; /* Argument list */ 76 Char *wptr, *wmax; /* Space and limit on the word buffer */ 77 Char *wstart; /* Beginning of next word */ 78 Char *wspace; /* Space of word buffer */ 79 quote_t quote; /* Quoting state */ 80 int flags; /* flags; */ 81 }; 82 83 84 private void FUN(tok,finish)(TYPE(Tokenizer) *); 85 86 87 /* FUN(tok,finish)(): 88 * Finish a word in the tokenizer. 89 */ 90 private void 91 FUN(tok,finish)(TYPE(Tokenizer) *tok) 92 { 93 94 *tok->wptr = '\0'; 95 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 96 tok->argv[tok->argc++] = tok->wstart; 97 tok->argv[tok->argc] = NULL; 98 tok->wstart = ++tok->wptr; 99 } 100 tok->flags &= ~TOK_KEEP; 101 } 102 103 104 /* FUN(tok,init)(): 105 * Initialize the tokenizer 106 */ 107 public TYPE(Tokenizer) * 108 FUN(tok,init)(const Char *ifs) 109 { 110 TYPE(Tokenizer) *tok = tok_malloc(sizeof(*tok)); 111 112 if (tok == NULL) 113 return NULL; 114 tok->ifs = tok_strdup(ifs ? ifs : IFS); 115 if (tok->ifs == NULL) { 116 tok_free(tok); 117 return NULL; 118 } 119 tok->argc = 0; 120 tok->amax = AINCR; 121 tok->argv = tok_malloc(sizeof(*tok->argv) * tok->amax); 122 if (tok->argv == NULL) { 123 tok_free(tok->ifs); 124 tok_free(tok); 125 return NULL; 126 } 127 tok->argv[0] = NULL; 128 tok->wspace = tok_malloc(WINCR * sizeof(*tok->wspace)); 129 if (tok->wspace == NULL) { 130 tok_free(tok->argv); 131 tok_free(tok->ifs); 132 tok_free(tok); 133 return NULL; 134 } 135 tok->wmax = tok->wspace + WINCR; 136 tok->wstart = tok->wspace; 137 tok->wptr = tok->wspace; 138 tok->flags = 0; 139 tok->quote = Q_none; 140 141 return tok; 142 } 143 144 145 /* FUN(tok,reset)(): 146 * Reset the tokenizer 147 */ 148 public void 149 FUN(tok,reset)(TYPE(Tokenizer) *tok) 150 { 151 152 tok->argc = 0; 153 tok->wstart = tok->wspace; 154 tok->wptr = tok->wspace; 155 tok->flags = 0; 156 tok->quote = Q_none; 157 } 158 159 160 /* FUN(tok,end)(): 161 * Clean up 162 */ 163 public void 164 FUN(tok,end)(TYPE(Tokenizer) *tok) 165 { 166 167 tok_free(tok->ifs); 168 tok_free(tok->wspace); 169 tok_free(tok->argv); 170 tok_free(tok); 171 } 172 173 174 175 /* FUN(tok,line)(): 176 * Bourne shell (sh(1)) like tokenizing 177 * Arguments: 178 * tok current tokenizer state (setup with FUN(tok,init)()) 179 * line line to parse 180 * Returns: 181 * -1 Internal error 182 * 3 Quoted return 183 * 2 Unmatched double quote 184 * 1 Unmatched single quote 185 * 0 Ok 186 * Modifies (if return value is 0): 187 * argc number of arguments 188 * argv argument array 189 * cursorc if !NULL, argv element containing cursor 190 * cursorv if !NULL, offset in argv[cursorc] of cursor 191 */ 192 public int 193 FUN(tok,line)(TYPE(Tokenizer) *tok, const TYPE(LineInfo) *line, 194 int *argc, const Char ***argv, int *cursorc, int *cursoro) 195 { 196 const Char *ptr; 197 int cc, co; 198 199 cc = co = -1; 200 ptr = line->buffer; 201 for (ptr = line->buffer; ;ptr++) { 202 if (ptr >= line->lastchar) 203 ptr = STR(""); 204 if (ptr == line->cursor) { 205 cc = (int)tok->argc; 206 co = (int)(tok->wptr - tok->wstart); 207 } 208 switch (*ptr) { 209 case '\'': 210 tok->flags |= TOK_KEEP; 211 tok->flags &= ~TOK_EAT; 212 switch (tok->quote) { 213 case Q_none: 214 tok->quote = Q_single; /* Enter single quote 215 * mode */ 216 break; 217 218 case Q_single: /* Exit single quote mode */ 219 tok->quote = Q_none; 220 break; 221 222 case Q_one: /* Quote this ' */ 223 tok->quote = Q_none; 224 *tok->wptr++ = *ptr; 225 break; 226 227 case Q_double: /* Stay in double quote mode */ 228 *tok->wptr++ = *ptr; 229 break; 230 231 case Q_doubleone: /* Quote this ' */ 232 tok->quote = Q_double; 233 *tok->wptr++ = *ptr; 234 break; 235 236 default: 237 return -1; 238 } 239 break; 240 241 case '"': 242 tok->flags &= ~TOK_EAT; 243 tok->flags |= TOK_KEEP; 244 switch (tok->quote) { 245 case Q_none: /* Enter double quote mode */ 246 tok->quote = Q_double; 247 break; 248 249 case Q_double: /* Exit double quote mode */ 250 tok->quote = Q_none; 251 break; 252 253 case Q_one: /* Quote this " */ 254 tok->quote = Q_none; 255 *tok->wptr++ = *ptr; 256 break; 257 258 case Q_single: /* Stay in single quote mode */ 259 *tok->wptr++ = *ptr; 260 break; 261 262 case Q_doubleone: /* Quote this " */ 263 tok->quote = Q_double; 264 *tok->wptr++ = *ptr; 265 break; 266 267 default: 268 return -1; 269 } 270 break; 271 272 case '\\': 273 tok->flags |= TOK_KEEP; 274 tok->flags &= ~TOK_EAT; 275 switch (tok->quote) { 276 case Q_none: /* Quote next character */ 277 tok->quote = Q_one; 278 break; 279 280 case Q_double: /* Quote next character */ 281 tok->quote = Q_doubleone; 282 break; 283 284 case Q_one: /* Quote this, restore state */ 285 *tok->wptr++ = *ptr; 286 tok->quote = Q_none; 287 break; 288 289 case Q_single: /* Stay in single quote mode */ 290 *tok->wptr++ = *ptr; 291 break; 292 293 case Q_doubleone: /* Quote this \ */ 294 tok->quote = Q_double; 295 *tok->wptr++ = *ptr; 296 break; 297 298 default: 299 return -1; 300 } 301 break; 302 303 case '\n': 304 tok->flags &= ~TOK_EAT; 305 switch (tok->quote) { 306 case Q_none: 307 goto tok_line_outok; 308 309 case Q_single: 310 case Q_double: 311 *tok->wptr++ = *ptr; /* Add the return */ 312 break; 313 314 case Q_doubleone: /* Back to double, eat the '\n' */ 315 tok->flags |= TOK_EAT; 316 tok->quote = Q_double; 317 break; 318 319 case Q_one: /* No quote, more eat the '\n' */ 320 tok->flags |= TOK_EAT; 321 tok->quote = Q_none; 322 break; 323 324 default: 325 return 0; 326 } 327 break; 328 329 case '\0': 330 switch (tok->quote) { 331 case Q_none: 332 /* Finish word and return */ 333 if (tok->flags & TOK_EAT) { 334 tok->flags &= ~TOK_EAT; 335 return 3; 336 } 337 goto tok_line_outok; 338 339 case Q_single: 340 return 1; 341 342 case Q_double: 343 return 2; 344 345 case Q_doubleone: 346 tok->quote = Q_double; 347 *tok->wptr++ = *ptr; 348 break; 349 350 case Q_one: 351 tok->quote = Q_none; 352 *tok->wptr++ = *ptr; 353 break; 354 355 default: 356 return -1; 357 } 358 break; 359 360 default: 361 tok->flags &= ~TOK_EAT; 362 switch (tok->quote) { 363 case Q_none: 364 if (Strchr(tok->ifs, *ptr) != NULL) 365 FUN(tok,finish)(tok); 366 else 367 *tok->wptr++ = *ptr; 368 break; 369 370 case Q_single: 371 case Q_double: 372 *tok->wptr++ = *ptr; 373 break; 374 375 376 case Q_doubleone: 377 *tok->wptr++ = '\\'; 378 tok->quote = Q_double; 379 *tok->wptr++ = *ptr; 380 break; 381 382 case Q_one: 383 tok->quote = Q_none; 384 *tok->wptr++ = *ptr; 385 break; 386 387 default: 388 return -1; 389 390 } 391 break; 392 } 393 394 if (tok->wptr >= tok->wmax - 4) { 395 size_t size = (size_t)(tok->wmax - tok->wspace + WINCR); 396 Char *s = tok_realloc(tok->wspace, 397 size * sizeof(*s)); 398 if (s == NULL) 399 return -1; 400 401 if (s != tok->wspace) { 402 size_t i; 403 for (i = 0; i < tok->argc; i++) { 404 tok->argv[i] = 405 (tok->argv[i] - tok->wspace) + s; 406 } 407 tok->wptr = (tok->wptr - tok->wspace) + s; 408 tok->wstart = (tok->wstart - tok->wspace) + s; 409 tok->wspace = s; 410 } 411 tok->wmax = s + size; 412 } 413 if (tok->argc >= tok->amax - 4) { 414 Char **p; 415 tok->amax += AINCR; 416 p = tok_realloc(tok->argv, tok->amax * sizeof(*p)); 417 if (p == NULL) { 418 tok->amax -= AINCR; 419 return -1; 420 } 421 tok->argv = p; 422 } 423 } 424 tok_line_outok: 425 if (cc == -1 && co == -1) { 426 cc = (int)tok->argc; 427 co = (int)(tok->wptr - tok->wstart); 428 } 429 if (cursorc != NULL) 430 *cursorc = cc; 431 if (cursoro != NULL) 432 *cursoro = co; 433 FUN(tok,finish)(tok); 434 *argv = (const Char **)tok->argv; 435 *argc = (int)tok->argc; 436 return 0; 437 } 438 439 /* FUN(tok,str)(): 440 * Simpler version of tok_line, taking a NUL terminated line 441 * and splitting into words, ignoring cursor state. 442 */ 443 public int 444 FUN(tok,str)(TYPE(Tokenizer) *tok, const Char *line, int *argc, 445 const Char ***argv) 446 { 447 TYPE(LineInfo) li; 448 449 memset(&li, 0, sizeof(li)); 450 li.buffer = line; 451 li.cursor = li.lastchar = Strchr(line, '\0'); 452 return FUN(tok,line)(tok, &li, argc, argv, NULL, NULL); 453 } 454
Indexes created Tue Sep 23 02:09:52 GMT 2025