tokenizer.c revision 1.13
1 /* $NetBSD: tokenizer.c,v 1.13 2003/10/18 23:48:42 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 1.13 2003/10/18 23:48:42 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 "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_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 like tokenizing 174 * Return: 175 * -1: Internal error 176 * 3: Quoted return 177 * 2: Unmatched double quote 178 * 1: Unmatched single quote 179 * 0: Ok 180 */ 181 public int 182 tok_line(Tokenizer *tok, const char *line, int *argc, const char ***argv) 183 { 184 const char *ptr; 185 186 for (;;) { 187 switch (*(ptr = line++)) { 188 case '\'': 189 tok->flags |= TOK_KEEP; 190 tok->flags &= ~TOK_EAT; 191 switch (tok->quote) { 192 case Q_none: 193 tok->quote = Q_single; /* Enter single quote 194 * mode */ 195 break; 196 197 case Q_single: /* Exit single quote mode */ 198 tok->quote = Q_none; 199 break; 200 201 case Q_one: /* Quote this ' */ 202 tok->quote = Q_none; 203 *tok->wptr++ = *ptr; 204 break; 205 206 case Q_double: /* Stay in double quote mode */ 207 *tok->wptr++ = *ptr; 208 break; 209 210 case Q_doubleone: /* Quote this ' */ 211 tok->quote = Q_double; 212 *tok->wptr++ = *ptr; 213 break; 214 215 default: 216 return (-1); 217 } 218 break; 219 220 case '"': 221 tok->flags &= ~TOK_EAT; 222 tok->flags |= TOK_KEEP; 223 switch (tok->quote) { 224 case Q_none: /* Enter double quote mode */ 225 tok->quote = Q_double; 226 break; 227 228 case Q_double: /* Exit double quote mode */ 229 tok->quote = Q_none; 230 break; 231 232 case Q_one: /* Quote this " */ 233 tok->quote = Q_none; 234 *tok->wptr++ = *ptr; 235 break; 236 237 case Q_single: /* Stay in single quote mode */ 238 *tok->wptr++ = *ptr; 239 break; 240 241 case Q_doubleone: /* Quote this " */ 242 tok->quote = Q_double; 243 *tok->wptr++ = *ptr; 244 break; 245 246 default: 247 return (-1); 248 } 249 break; 250 251 case '\\': 252 tok->flags |= TOK_KEEP; 253 tok->flags &= ~TOK_EAT; 254 switch (tok->quote) { 255 case Q_none: /* Quote next character */ 256 tok->quote = Q_one; 257 break; 258 259 case Q_double: /* Quote next character */ 260 tok->quote = Q_doubleone; 261 break; 262 263 case Q_one: /* Quote this, restore state */ 264 *tok->wptr++ = *ptr; 265 tok->quote = Q_none; 266 break; 267 268 case Q_single: /* Stay in single quote mode */ 269 *tok->wptr++ = *ptr; 270 break; 271 272 case Q_doubleone: /* Quote this \ */ 273 tok->quote = Q_double; 274 *tok->wptr++ = *ptr; 275 break; 276 277 default: 278 return (-1); 279 } 280 break; 281 282 case '\n': 283 tok->flags &= ~TOK_EAT; 284 switch (tok->quote) { 285 case Q_none: 286 tok_finish(tok); 287 *argv = (const char **)tok->argv; 288 *argc = tok->argc; 289 return (0); 290 291 case Q_single: 292 case Q_double: 293 *tok->wptr++ = *ptr; /* Add the return */ 294 break; 295 296 case Q_doubleone: /* Back to double, eat the '\n' */ 297 tok->flags |= TOK_EAT; 298 tok->quote = Q_double; 299 break; 300 301 case Q_one: /* No quote, more eat the '\n' */ 302 tok->flags |= TOK_EAT; 303 tok->quote = Q_none; 304 break; 305 306 default: 307 return (0); 308 } 309 break; 310 311 case '\0': 312 switch (tok->quote) { 313 case Q_none: 314 /* Finish word and return */ 315 if (tok->flags & TOK_EAT) { 316 tok->flags &= ~TOK_EAT; 317 return (3); 318 } 319 tok_finish(tok); 320 *argv = (const char **)tok->argv; 321 *argc = tok->argc; 322 return (0); 323 324 case Q_single: 325 return (1); 326 327 case Q_double: 328 return (2); 329 330 case Q_doubleone: 331 tok->quote = Q_double; 332 *tok->wptr++ = *ptr; 333 break; 334 335 case Q_one: 336 tok->quote = Q_none; 337 *tok->wptr++ = *ptr; 338 break; 339 340 default: 341 return (-1); 342 } 343 break; 344 345 default: 346 tok->flags &= ~TOK_EAT; 347 switch (tok->quote) { 348 case Q_none: 349 if (strchr(tok->ifs, *ptr) != NULL) 350 tok_finish(tok); 351 else 352 *tok->wptr++ = *ptr; 353 break; 354 355 case Q_single: 356 case Q_double: 357 *tok->wptr++ = *ptr; 358 break; 359 360 361 case Q_doubleone: 362 *tok->wptr++ = '\\'; 363 tok->quote = Q_double; 364 *tok->wptr++ = *ptr; 365 break; 366 367 case Q_one: 368 tok->quote = Q_none; 369 *tok->wptr++ = *ptr; 370 break; 371 372 default: 373 return (-1); 374 375 } 376 break; 377 } 378 379 if (tok->wptr >= tok->wmax - 4) { 380 size_t size = tok->wmax - tok->wspace + WINCR; 381 char *s = (char *) tok_realloc(tok->wspace, size); 382 if (s == NULL) 383 return (-1); 384 385 if (s != tok->wspace) { 386 int i; 387 for (i = 0; i < tok->argc; i++) { 388 tok->argv[i] = 389 (tok->argv[i] - tok->wspace) + s; 390 } 391 tok->wptr = (tok->wptr - tok->wspace) + s; 392 tok->wstart = (tok->wstart - tok->wspace) + s; 393 tok->wspace = s; 394 } 395 tok->wmax = s + size; 396 } 397 if (tok->argc >= tok->amax - 4) { 398 char **p; 399 tok->amax += AINCR; 400 p = (char **) tok_realloc(tok->argv, 401 tok->amax * sizeof(char *)); 402 if (p == NULL) 403 return (-1); 404 tok->argv = p; 405 } 406 } 407 } 408
Indexes created Thu Sep 25 06:09:39 GMT 2025