tokenizer.c revision 1.15
1 /* $NetBSD: tokenizer.c,v 1.15 2009/02/15 21:55:23 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 1.15 2009/02/15 21:55:23 christos Exp $"); 41 #endif 42 #endif /* not lint && not SCCSID */ 43 44 /* 45 * tokenize.c: Bourne shell like tokenizer 46 */ 47 #include <string.h> 48 #include <stdlib.h> 49 #include "histedit.h" 50 51 typedef enum { 52 Q_none, Q_single, Q_double, Q_one, Q_doubleone 53 } quote_t; 54 55 #define IFS "\t \n" 56 57 #define TOK_KEEP 1 58 #define TOK_EAT 2 59 60 #define WINCR 20 61 #define AINCR 10 62 63 #define tok_strdup(a) strdup(a) 64 #define tok_malloc(a) malloc(a) 65 #define tok_free(a) free(a) 66 #define tok_realloc(a, b) realloc(a, b) 67 68 69 struct tokenizer { 70 char *ifs; /* In field separator */ 71 int argc, amax; /* Current and maximum number of args */ 72 char **argv; /* Argument list */ 73 char *wptr, *wmax; /* Space and limit on the word buffer */ 74 char *wstart; /* Beginning of next word */ 75 char *wspace; /* Space of word buffer */ 76 quote_t quote; /* Quoting state */ 77 int flags; /* flags; */ 78 }; 79 80 81 private void tok_finish(Tokenizer *); 82 83 84 /* tok_finish(): 85 * Finish a word in the tokenizer. 86 */ 87 private void 88 tok_finish(Tokenizer *tok) 89 { 90 91 *tok->wptr = '\0'; 92 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 93 tok->argv[tok->argc++] = tok->wstart; 94 tok->argv[tok->argc] = NULL; 95 tok->wstart = ++tok->wptr; 96 } 97 tok->flags &= ~TOK_KEEP; 98 } 99 100 101 /* tok_init(): 102 * Initialize the tokenizer 103 */ 104 public Tokenizer * 105 tok_init(const char *ifs) 106 { 107 Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer)); 108 109 if (tok == NULL) 110 return NULL; 111 tok->ifs = tok_strdup(ifs ? ifs : IFS); 112 if (tok->ifs == NULL) { 113 tok_free((ptr_t)tok); 114 return NULL; 115 } 116 tok->argc = 0; 117 tok->amax = AINCR; 118 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); 119 if (tok->argv == NULL) { 120 tok_free((ptr_t)tok->ifs); 121 tok_free((ptr_t)tok); 122 return NULL; 123 } 124 tok->argv[0] = NULL; 125 tok->wspace = (char *) tok_malloc(WINCR); 126 if (tok->wspace == NULL) { 127 tok_free((ptr_t)tok->argv); 128 tok_free((ptr_t)tok->ifs); 129 tok_free((ptr_t)tok); 130 return NULL; 131 } 132 tok->wmax = tok->wspace + WINCR; 133 tok->wstart = tok->wspace; 134 tok->wptr = tok->wspace; 135 tok->flags = 0; 136 tok->quote = Q_none; 137 138 return (tok); 139 } 140 141 142 /* tok_reset(): 143 * Reset the tokenizer 144 */ 145 public void 146 tok_reset(Tokenizer *tok) 147 { 148 149 tok->argc = 0; 150 tok->wstart = tok->wspace; 151 tok->wptr = tok->wspace; 152 tok->flags = 0; 153 tok->quote = Q_none; 154 } 155 156 157 /* tok_end(): 158 * Clean up 159 */ 160 public void 161 tok_end(Tokenizer *tok) 162 { 163 164 tok_free((ptr_t) tok->ifs); 165 tok_free((ptr_t) tok->wspace); 166 tok_free((ptr_t) tok->argv); 167 tok_free((ptr_t) tok); 168 } 169 170 171 172 /* tok_line(): 173 * Bourne shell (sh(1)) like tokenizing 174 * Arguments: 175 * tok current tokenizer state (setup with tok_init()) 176 * line line to parse 177 * Returns: 178 * -1 Internal error 179 * 3 Quoted return 180 * 2 Unmatched double quote 181 * 1 Unmatched single quote 182 * 0 Ok 183 * Modifies (if return value is 0): 184 * argc number of arguments 185 * argv argument array 186 * cursorc if !NULL, argv element containing cursor 187 * cursorv if !NULL, offset in argv[cursorc] of cursor 188 */ 189 public int 190 tok_line(Tokenizer *tok, const LineInfo *line, 191 int *argc, const char ***argv, int *cursorc, int *cursoro) 192 { 193 const char *ptr; 194 int cc, co; 195 196 cc = co = -1; 197 ptr = line->buffer; 198 for (ptr = line->buffer; ;ptr++) { 199 if (ptr >= line->lastchar) 200 ptr = ""; 201 if (ptr == line->cursor) { 202 cc = tok->argc; 203 co = (int)(tok->wptr - tok->wstart); 204 } 205 switch (*ptr) { 206 case '\'': 207 tok->flags |= TOK_KEEP; 208 tok->flags &= ~TOK_EAT; 209 switch (tok->quote) { 210 case Q_none: 211 tok->quote = Q_single; /* Enter single quote 212 * mode */ 213 break; 214 215 case Q_single: /* Exit single quote mode */ 216 tok->quote = Q_none; 217 break; 218 219 case Q_one: /* Quote this ' */ 220 tok->quote = Q_none; 221 *tok->wptr++ = *ptr; 222 break; 223 224 case Q_double: /* Stay in double quote mode */ 225 *tok->wptr++ = *ptr; 226 break; 227 228 case Q_doubleone: /* Quote this ' */ 229 tok->quote = Q_double; 230 *tok->wptr++ = *ptr; 231 break; 232 233 default: 234 return (-1); 235 } 236 break; 237 238 case '"': 239 tok->flags &= ~TOK_EAT; 240 tok->flags |= TOK_KEEP; 241 switch (tok->quote) { 242 case Q_none: /* Enter double quote mode */ 243 tok->quote = Q_double; 244 break; 245 246 case Q_double: /* Exit double quote mode */ 247 tok->quote = Q_none; 248 break; 249 250 case Q_one: /* Quote this " */ 251 tok->quote = Q_none; 252 *tok->wptr++ = *ptr; 253 break; 254 255 case Q_single: /* Stay in single quote mode */ 256 *tok->wptr++ = *ptr; 257 break; 258 259 case Q_doubleone: /* Quote this " */ 260 tok->quote = Q_double; 261 *tok->wptr++ = *ptr; 262 break; 263 264 default: 265 return (-1); 266 } 267 break; 268 269 case '\\': 270 tok->flags |= TOK_KEEP; 271 tok->flags &= ~TOK_EAT; 272 switch (tok->quote) { 273 case Q_none: /* Quote next character */ 274 tok->quote = Q_one; 275 break; 276 277 case Q_double: /* Quote next character */ 278 tok->quote = Q_doubleone; 279 break; 280 281 case Q_one: /* Quote this, restore state */ 282 *tok->wptr++ = *ptr; 283 tok->quote = Q_none; 284 break; 285 286 case Q_single: /* Stay in single quote mode */ 287 *tok->wptr++ = *ptr; 288 break; 289 290 case Q_doubleone: /* Quote this \ */ 291 tok->quote = Q_double; 292 *tok->wptr++ = *ptr; 293 break; 294 295 default: 296 return (-1); 297 } 298 break; 299 300 case '\n': 301 tok->flags &= ~TOK_EAT; 302 switch (tok->quote) { 303 case Q_none: 304 goto tok_line_outok; 305 306 case Q_single: 307 case Q_double: 308 *tok->wptr++ = *ptr; /* Add the return */ 309 break; 310 311 case Q_doubleone: /* Back to double, eat the '\n' */ 312 tok->flags |= TOK_EAT; 313 tok->quote = Q_double; 314 break; 315 316 case Q_one: /* No quote, more eat the '\n' */ 317 tok->flags |= TOK_EAT; 318 tok->quote = Q_none; 319 break; 320 321 default: 322 return (0); 323 } 324 break; 325 326 case '\0': 327 switch (tok->quote) { 328 case Q_none: 329 /* Finish word and return */ 330 if (tok->flags & TOK_EAT) { 331 tok->flags &= ~TOK_EAT; 332 return (3); 333 } 334 goto tok_line_outok; 335 336 case Q_single: 337 return (1); 338 339 case Q_double: 340 return (2); 341 342 case Q_doubleone: 343 tok->quote = Q_double; 344 *tok->wptr++ = *ptr; 345 break; 346 347 case Q_one: 348 tok->quote = Q_none; 349 *tok->wptr++ = *ptr; 350 break; 351 352 default: 353 return (-1); 354 } 355 break; 356 357 default: 358 tok->flags &= ~TOK_EAT; 359 switch (tok->quote) { 360 case Q_none: 361 if (strchr(tok->ifs, *ptr) != NULL) 362 tok_finish(tok); 363 else 364 *tok->wptr++ = *ptr; 365 break; 366 367 case Q_single: 368 case Q_double: 369 *tok->wptr++ = *ptr; 370 break; 371 372 373 case Q_doubleone: 374 *tok->wptr++ = '\\'; 375 tok->quote = Q_double; 376 *tok->wptr++ = *ptr; 377 break; 378 379 case Q_one: 380 tok->quote = Q_none; 381 *tok->wptr++ = *ptr; 382 break; 383 384 default: 385 return (-1); 386 387 } 388 break; 389 } 390 391 if (tok->wptr >= tok->wmax - 4) { 392 size_t size = tok->wmax - tok->wspace + WINCR; 393 char *s = (char *) tok_realloc(tok->wspace, size); 394 if (s == NULL) 395 return (-1); 396 397 if (s != tok->wspace) { 398 int i; 399 for (i = 0; i < tok->argc; i++) { 400 tok->argv[i] = 401 (tok->argv[i] - tok->wspace) + s; 402 } 403 tok->wptr = (tok->wptr - tok->wspace) + s; 404 tok->wstart = (tok->wstart - tok->wspace) + s; 405 tok->wspace = s; 406 } 407 tok->wmax = s + size; 408 } 409 if (tok->argc >= tok->amax - 4) { 410 char **p; 411 tok->amax += AINCR; 412 p = (char **) tok_realloc(tok->argv, 413 tok->amax * sizeof(char *)); 414 if (p == NULL) 415 return (-1); 416 tok->argv = p; 417 } 418 } 419 tok_line_outok: 420 if (cc == -1 && co == -1) { 421 cc = tok->argc; 422 co = (int)(tok->wptr - tok->wstart); 423 } 424 if (cursorc != NULL) 425 *cursorc = cc; 426 if (cursoro != NULL) 427 *cursoro = co; 428 tok_finish(tok); 429 *argv = (const char **)tok->argv; 430 *argc = tok->argc; 431 return (0); 432 } 433 434 /* tok_str(): 435 * Simpler version of tok_line, taking a NUL terminated line 436 * and splitting into words, ignoring cursor state. 437 */ 438 public int 439 tok_str(Tokenizer *tok, const char *line, int *argc, const char ***argv) 440 { 441 LineInfo li; 442 443 memset(&li, 0, sizeof(li)); 444 li.buffer = line; 445 li.cursor = li.lastchar = strchr(line, '\0'); 446 return (tok_line(tok, &li, argc, argv, NULL, NULL)); 447 } 448
Indexes created Tue Sep 23 02:09:52 GMT 2025