tokenizer.c revision 1.3
1 /* $NetBSD: tokenizer.c,v 1.3 1997/07/06 18:25:37 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if !defined(lint) && !defined(SCCSID) 41 #if 0 42 static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: tokenizer.c,v 1.3 1997/07/06 18:25:37 christos Exp $"); 45 #endif 46 #endif /* not lint && not SCCSID */ 47 48 /* 49 * tokenize.c: Bourne shell like tokenizer 50 */ 51 #include "sys.h" 52 #include <string.h> 53 #include <stdlib.h> 54 #include "tokenizer.h" 55 56 typedef enum { Q_none, Q_single, Q_double, Q_one, Q_doubleone } quote_t; 57 58 #define IFS "\t \n" 59 60 #define TOK_KEEP 1 61 #define TOK_EAT 2 62 63 #define WINCR 20 64 #define AINCR 10 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 70 71 struct tokenizer { 72 char *ifs; /* In field separator */ 73 int argc, amax; /* Current and maximum number of args */ 74 char **argv; /* Argument list */ 75 char *wptr, *wmax; /* Space and limit on the word buffer */ 76 char *wstart; /* Beginning of next word */ 77 char *wspace; /* Space of word buffer */ 78 quote_t quote; /* Quoting state */ 79 int flags; /* flags; */ 80 }; 81 82 83 private void tok_finish __P((Tokenizer *)); 84 85 86 /* tok_finish(): 87 * Finish a word in the tokenizer. 88 */ 89 private void 90 tok_finish(tok) 91 Tokenizer *tok; 92 { 93 *tok->wptr = '\0'; 94 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 95 tok->argv[tok->argc++] = tok->wstart; 96 tok->argv[tok->argc] = NULL; 97 tok->wstart = ++tok->wptr; 98 } 99 tok->flags &= ~TOK_KEEP; 100 } 101 102 103 /* tok_init(): 104 * Initialize the tokenizer 105 */ 106 public Tokenizer * 107 tok_init(ifs) 108 const char *ifs; 109 { 110 Tokenizer* tok = (Tokenizer*) tok_malloc(sizeof(Tokenizer)); 111 112 tok->ifs = strdup(ifs ? ifs : IFS); 113 tok->argc = 0; 114 tok->amax = AINCR; 115 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); 116 tok->argv[0] = NULL; 117 tok->wspace = (char *) tok_malloc(WINCR); 118 tok->wmax = tok->wspace + WINCR; 119 tok->wstart = tok->wspace; 120 tok->wptr = tok->wspace; 121 tok->flags = 0; 122 tok->quote = Q_none; 123 124 return tok; 125 } 126 127 128 /* tok_reset(): 129 * Reset the tokenizer 130 */ 131 public void 132 tok_reset(tok) 133 Tokenizer *tok; 134 { 135 tok->argc = 0; 136 tok->wstart = tok->wspace; 137 tok->wptr = tok->wspace; 138 tok->flags = 0; 139 tok->quote = Q_none; 140 } 141 142 143 /* tok_end(): 144 * Clean up 145 */ 146 public void 147 tok_end(tok) 148 Tokenizer *tok; 149 { 150 tok_free((ptr_t) tok->ifs); 151 tok_free((ptr_t) tok->wspace); 152 tok_free((ptr_t) tok->argv); 153 tok_free((ptr_t) tok); 154 } 155 156 157 158 /* tok_line(): 159 * Bourne shell like tokenizing 160 * Return: 161 * -1: Internal error 162 * 3: Quoted return 163 * 2: Unmatched double quote 164 * 1: Unmatched single quote 165 * 0: Ok 166 */ 167 public int 168 tok_line(tok, line, argc, argv) 169 Tokenizer *tok; 170 const char* line; 171 int *argc; 172 char ***argv; 173 { 174 const char *ptr; 175 176 while (1) { 177 switch (*(ptr = line++)) { 178 case '\'': 179 tok->flags |= TOK_KEEP; 180 tok->flags &= ~TOK_EAT; 181 switch (tok->quote) { 182 case Q_none: 183 tok->quote = Q_single; /* Enter single quote mode */ 184 break; 185 186 case Q_single: /* Exit single quote mode */ 187 tok->quote = Q_none; 188 break; 189 190 case Q_one: /* Quote this ' */ 191 tok->quote = Q_none; 192 *tok->wptr++ = *ptr; 193 break; 194 195 case Q_double: /* Stay in double quote mode */ 196 *tok->wptr++ = *ptr; 197 break; 198 199 case Q_doubleone: /* Quote this ' */ 200 tok->quote = Q_double; 201 *tok->wptr++ = *ptr; 202 break; 203 204 default: 205 return(-1); 206 } 207 break; 208 209 case '"': 210 tok->flags &= ~TOK_EAT; 211 tok->flags |= TOK_KEEP; 212 switch (tok->quote) { 213 case Q_none: /* Enter double quote mode */ 214 tok->quote = Q_double; 215 break; 216 217 case Q_double: 218 tok->quote = Q_none; /* Exit double quote mode */ 219 break; 220 221 case Q_one: /* Quote this " */ 222 tok->quote = Q_none; 223 *tok->wptr++ = *ptr; 224 break; 225 226 case Q_single: /* Stay in single quote mode */ 227 *tok->wptr++ = *ptr; 228 break; 229 230 case Q_doubleone: /* Quote this " */ 231 tok->quote = Q_double; 232 *tok->wptr++ = *ptr; 233 break; 234 235 default: 236 return(-1); 237 } 238 break; 239 240 case '\\': 241 tok->flags |= TOK_KEEP; 242 tok->flags &= ~TOK_EAT; 243 switch (tok->quote) { 244 case Q_none: /* Quote next character */ 245 tok->quote = Q_one; 246 break; 247 248 case Q_double: 249 tok->quote = Q_doubleone;/* Quote next character */ 250 break; 251 252 case Q_one: 253 *tok->wptr++ = *ptr; 254 tok->quote = Q_none; /* Quote this, restore state */ 255 break; 256 257 case Q_single: /* Stay in single quote mode */ 258 *tok->wptr++ = *ptr; 259 break; 260 261 case Q_doubleone: /* Quote this \ */ 262 tok->quote = Q_double; 263 *tok->wptr++ = *ptr; 264 break; 265 266 default: 267 return(-1); 268 } 269 break; 270 271 case '\n': 272 tok->flags &= ~TOK_EAT; 273 switch (tok->quote) { 274 case Q_none: 275 tok_finish(tok); 276 *argv = tok->argv; 277 *argc = tok->argc; 278 return(0); 279 280 case Q_single: 281 case Q_double: 282 *tok->wptr++ = *ptr; /* Add the return */ 283 break; 284 285 case Q_doubleone: 286 tok->flags |= TOK_EAT; 287 tok->quote = Q_double; /* Back to double, eat the '\n' */ 288 break; 289 290 case Q_one: 291 tok->flags |= TOK_EAT; 292 tok->quote = Q_none; /* No quote, more eat the '\n' */ 293 break; 294 295 default: 296 return(0); 297 } 298 break; 299 300 case '\0': 301 switch (tok->quote) { 302 case Q_none: 303 /* Finish word and return */ 304 if (tok->flags & TOK_EAT) { 305 tok->flags &= ~TOK_EAT; 306 return 3; 307 } 308 tok_finish(tok); 309 *argv = tok->argv; 310 *argc = tok->argc; 311 return(0); 312 313 case Q_single: 314 return(1); 315 316 case Q_double: 317 return(2); 318 319 case Q_doubleone: 320 tok->quote = Q_double; 321 *tok->wptr++ = *ptr; 322 break; 323 324 case Q_one: 325 tok->quote = Q_none; 326 *tok->wptr++ = *ptr; 327 break; 328 329 default: 330 return(-1); 331 } 332 break; 333 334 default: 335 tok->flags &= ~TOK_EAT; 336 switch (tok->quote) { 337 case Q_none: 338 if (strchr(tok->ifs, *ptr) != NULL) 339 tok_finish(tok); 340 else 341 *tok->wptr++ = *ptr; 342 break; 343 344 case Q_single: 345 case Q_double: 346 *tok->wptr++ = *ptr; 347 break; 348 349 350 case Q_doubleone: 351 *tok->wptr++ = '\\'; 352 tok->quote = Q_double; 353 *tok->wptr++ = *ptr; 354 break; 355 356 case Q_one: 357 tok->quote = Q_none; 358 *tok->wptr++ = *ptr; 359 break; 360 361 default: 362 return(-1); 363 364 } 365 break; 366 } 367 368 if (tok->wptr >= tok->wmax - 4) { 369 size_t size = tok->wmax - tok->wspace + WINCR; 370 char *s = (char *) tok_realloc(tok->wspace, size); 371 /*SUPPRESS 22*/ 372 int offs = s - tok->wspace; 373 374 if (offs != 0) { 375 int i; 376 for (i = 0; i < tok->argc; i++) 377 tok->argv[i] = tok->argv[i] + offs; 378 tok->wptr = tok->wptr + offs; 379 tok->wstart = tok->wstart + offs; 380 tok->wmax = s + size; 381 tok->wspace = s; 382 } 383 } 384 385 if (tok->argc >= tok->amax - 4) { 386 tok->amax += AINCR; 387 tok->argv = (char **) tok_realloc(tok->argv, 388 tok->amax * sizeof(char*)); 389 } 390 391 } 392 } 393
Indexes created Thu Sep 25 06:09:39 GMT 2025