tokenizer.c revision 1.12
1 /* $NetBSD: tokenizer.c,v 1.12 2003/08/07 16:44:34 agc 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 1.12 2003/08/07 16:44:34 agc 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 "tokenizer.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_malloc(a) malloc(a) 64 #define tok_free(a) free(a) 65 #define tok_realloc(a, b) realloc(a, b) 66 67 68 struct tokenizer { 69 char *ifs; /* In field separator */ 70 int argc, amax; /* Current and maximum number of args */ 71 char **argv; /* Argument list */ 72 char *wptr, *wmax; /* Space and limit on the word buffer */ 73 char *wstart; /* Beginning of next word */ 74 char *wspace; /* Space of word buffer */ 75 quote_t quote; /* Quoting state */ 76 int flags; /* flags; */ 77 }; 78 79 80 private void tok_finish(Tokenizer *); 81 82 83 /* tok_finish(): 84 * Finish a word in the tokenizer. 85 */ 86 private void 87 tok_finish(Tokenizer *tok) 88 { 89 90 *tok->wptr = '\0'; 91 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 92 tok->argv[tok->argc++] = tok->wstart; 93 tok->argv[tok->argc] = NULL; 94 tok->wstart = ++tok->wptr; 95 } 96 tok->flags &= ~TOK_KEEP; 97 } 98 99 100 /* tok_init(): 101 * Initialize the tokenizer 102 */ 103 public Tokenizer * 104 tok_init(const char *ifs) 105 { 106 Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer)); 107 108 if (tok == NULL) 109 return NULL; 110 tok->ifs = strdup(ifs ? ifs : IFS); 111 if (tok->ifs == NULL) { 112 tok_free((ptr_t)tok); 113 return NULL; 114 } 115 tok->argc = 0; 116 tok->amax = AINCR; 117 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); 118 if (tok->argv == NULL) { 119 tok_free((ptr_t)tok->ifs); 120 tok_free((ptr_t)tok); 121 return NULL; 122 } 123 tok->argv[0] = NULL; 124 tok->wspace = (char *) tok_malloc(WINCR); 125 if (tok->wspace == NULL) { 126 tok_free((ptr_t)tok->argv); 127 tok_free((ptr_t)tok->ifs); 128 tok_free((ptr_t)tok); 129 return NULL; 130 } 131 tok->wmax = tok->wspace + WINCR; 132 tok->wstart = tok->wspace; 133 tok->wptr = tok->wspace; 134 tok->flags = 0; 135 tok->quote = Q_none; 136 137 return (tok); 138 } 139 140 141 /* tok_reset(): 142 * Reset the tokenizer 143 */ 144 public void 145 tok_reset(Tokenizer *tok) 146 { 147 148 tok->argc = 0; 149 tok->wstart = tok->wspace; 150 tok->wptr = tok->wspace; 151 tok->flags = 0; 152 tok->quote = Q_none; 153 } 154 155 156 /* tok_end(): 157 * Clean up 158 */ 159 public void 160 tok_end(Tokenizer *tok) 161 { 162 163 tok_free((ptr_t) tok->ifs); 164 tok_free((ptr_t) tok->wspace); 165 tok_free((ptr_t) tok->argv); 166 tok_free((ptr_t) tok); 167 } 168 169 170 171 /* tok_line(): 172 * Bourne shell like tokenizing 173 * Return: 174 * -1: Internal error 175 * 3: Quoted return 176 * 2: Unmatched double quote 177 * 1: Unmatched single quote 178 * 0: Ok 179 */ 180 public int 181 tok_line(Tokenizer *tok, const char *line, int *argc, const char ***argv) 182 { 183 const char *ptr; 184 185 for (;;) { 186 switch (*(ptr = line++)) { 187 case '\'': 188 tok->flags |= TOK_KEEP; 189 tok->flags &= ~TOK_EAT; 190 switch (tok->quote) { 191 case Q_none: 192 tok->quote = Q_single; /* Enter single quote 193 * mode */ 194 break; 195 196 case Q_single: /* Exit single quote mode */ 197 tok->quote = Q_none; 198 break; 199 200 case Q_one: /* Quote this ' */ 201 tok->quote = Q_none; 202 *tok->wptr++ = *ptr; 203 break; 204 205 case Q_double: /* Stay in double quote mode */ 206 *tok->wptr++ = *ptr; 207 break; 208 209 case Q_doubleone: /* Quote this ' */ 210 tok->quote = Q_double; 211 *tok->wptr++ = *ptr; 212 break; 213 214 default: 215 return (-1); 216 } 217 break; 218 219 case '"': 220 tok->flags &= ~TOK_EAT; 221 tok->flags |= TOK_KEEP; 222 switch (tok->quote) { 223 case Q_none: /* Enter double quote mode */ 224 tok->quote = Q_double; 225 break; 226 227 case Q_double: /* Exit double quote mode */ 228 tok->quote = Q_none; 229 break; 230 231 case Q_one: /* Quote this " */ 232 tok->quote = Q_none; 233 *tok->wptr++ = *ptr; 234 break; 235 236 case Q_single: /* Stay in single quote mode */ 237 *tok->wptr++ = *ptr; 238 break; 239 240 case Q_doubleone: /* Quote this " */ 241 tok->quote = Q_double; 242 *tok->wptr++ = *ptr; 243 break; 244 245 default: 246 return (-1); 247 } 248 break; 249 250 case '\\': 251 tok->flags |= TOK_KEEP; 252 tok->flags &= ~TOK_EAT; 253 switch (tok->quote) { 254 case Q_none: /* Quote next character */ 255 tok->quote = Q_one; 256 break; 257 258 case Q_double: /* Quote next character */ 259 tok->quote = Q_doubleone; 260 break; 261 262 case Q_one: /* Quote this, restore state */ 263 *tok->wptr++ = *ptr; 264 tok->quote = Q_none; 265 break; 266 267 case Q_single: /* Stay in single quote mode */ 268 *tok->wptr++ = *ptr; 269 break; 270 271 case Q_doubleone: /* Quote this \ */ 272 tok->quote = Q_double; 273 *tok->wptr++ = *ptr; 274 break; 275 276 default: 277 return (-1); 278 } 279 break; 280 281 case '\n': 282 tok->flags &= ~TOK_EAT; 283 switch (tok->quote) { 284 case Q_none: 285 tok_finish(tok); 286 *argv = (const char **)tok->argv; 287 *argc = tok->argc; 288 return (0); 289 290 case Q_single: 291 case Q_double: 292 *tok->wptr++ = *ptr; /* Add the return */ 293 break; 294 295 case Q_doubleone: /* Back to double, eat the '\n' */ 296 tok->flags |= TOK_EAT; 297 tok->quote = Q_double; 298 break; 299 300 case Q_one: /* No quote, more eat the '\n' */ 301 tok->flags |= TOK_EAT; 302 tok->quote = Q_none; 303 break; 304 305 default: 306 return (0); 307 } 308 break; 309 310 case '\0': 311 switch (tok->quote) { 312 case Q_none: 313 /* Finish word and return */ 314 if (tok->flags & TOK_EAT) { 315 tok->flags &= ~TOK_EAT; 316 return (3); 317 } 318 tok_finish(tok); 319 *argv = (const char **)tok->argv; 320 *argc = tok->argc; 321 return (0); 322 323 case Q_single: 324 return (1); 325 326 case Q_double: 327 return (2); 328 329 case Q_doubleone: 330 tok->quote = Q_double; 331 *tok->wptr++ = *ptr; 332 break; 333 334 case Q_one: 335 tok->quote = Q_none; 336 *tok->wptr++ = *ptr; 337 break; 338 339 default: 340 return (-1); 341 } 342 break; 343 344 default: 345 tok->flags &= ~TOK_EAT; 346 switch (tok->quote) { 347 case Q_none: 348 if (strchr(tok->ifs, *ptr) != NULL) 349 tok_finish(tok); 350 else 351 *tok->wptr++ = *ptr; 352 break; 353 354 case Q_single: 355 case Q_double: 356 *tok->wptr++ = *ptr; 357 break; 358 359 360 case Q_doubleone: 361 *tok->wptr++ = '\\'; 362 tok->quote = Q_double; 363 *tok->wptr++ = *ptr; 364 break; 365 366 case Q_one: 367 tok->quote = Q_none; 368 *tok->wptr++ = *ptr; 369 break; 370 371 default: 372 return (-1); 373 374 } 375 break; 376 } 377 378 if (tok->wptr >= tok->wmax - 4) { 379 size_t size = tok->wmax - tok->wspace + WINCR; 380 char *s = (char *) tok_realloc(tok->wspace, size); 381 if (s == NULL) 382 return (-1); 383 384 if (s != tok->wspace) { 385 int i; 386 for (i = 0; i < tok->argc; i++) { 387 tok->argv[i] = 388 (tok->argv[i] - tok->wspace) + s; 389 } 390 tok->wptr = (tok->wptr - tok->wspace) + s; 391 tok->wstart = (tok->wstart - tok->wspace) + s; 392 tok->wspace = s; 393 } 394 tok->wmax = s + size; 395 } 396 if (tok->argc >= tok->amax - 4) { 397 char **p; 398 tok->amax += AINCR; 399 p = (char **) tok_realloc(tok->argv, 400 tok->amax * sizeof(char *)); 401 if (p == NULL) 402 return (-1); 403 tok->argv = p; 404 } 405 } 406 } 407
Indexes created Mon Sep 22 05:09:51 GMT 2025