tokenizer.c revision 1.2
1 /* $NetBSD: tokenizer.c,v 1.2 1997/01/11 06:48:15 lukem 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 #if !defined(lint) && !defined(SCCSID) 40 #if 0 41 static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93"; 42 #else 43 static char rcsid[] = "$NetBSD: tokenizer.c,v 1.2 1997/01/11 06:48:15 lukem Exp $"; 44 #endif 45 #endif /* not lint && not SCCSID */ 46 47 /* 48 * tokenize.c: Bourne shell like tokenizer 49 */ 50 #include "sys.h" 51 #include <string.h> 52 #include <stdlib.h> 53 #include "tokenizer.h" 54 55 typedef enum { Q_none, Q_single, Q_double, Q_one, Q_doubleone } quote_t; 56 57 #define IFS "\t \n" 58 59 #define TOK_KEEP 1 60 #define TOK_EAT 2 61 62 #define WINCR 20 63 #define AINCR 10 64 65 #define tok_malloc(a) malloc(a) 66 #define tok_free(a) free(a) 67 #define tok_realloc(a, b) realloc(a, b) 68 69 70 struct tokenizer { 71 char *ifs; /* In field separator */ 72 int argc, amax; /* Current and maximum number of args */ 73 char **argv; /* Argument list */ 74 char *wptr, *wmax; /* Space and limit on the word buffer */ 75 char *wstart; /* Beginning of next word */ 76 char *wspace; /* Space of word buffer */ 77 quote_t quote; /* Quoting state */ 78 int flags; /* flags; */ 79 }; 80 81 82 private void tok_finish __P((Tokenizer *)); 83 84 85 /* tok_finish(): 86 * Finish a word in the tokenizer. 87 */ 88 private void 89 tok_finish(tok) 90 Tokenizer *tok; 91 { 92 *tok->wptr = '\0'; 93 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 94 tok->argv[tok->argc++] = tok->wstart; 95 tok->argv[tok->argc] = NULL; 96 tok->wstart = ++tok->wptr; 97 } 98 tok->flags &= ~TOK_KEEP; 99 } 100 101 102 /* tok_init(): 103 * Initialize the tokenizer 104 */ 105 public Tokenizer * 106 tok_init(ifs) 107 const char *ifs; 108 { 109 Tokenizer* tok = (Tokenizer*) tok_malloc(sizeof(Tokenizer)); 110 111 tok->ifs = strdup(ifs ? ifs : IFS); 112 tok->argc = 0; 113 tok->amax = AINCR; 114 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); 115 tok->argv[0] = NULL; 116 tok->wspace = (char *) tok_malloc(WINCR); 117 tok->wmax = tok->wspace + WINCR; 118 tok->wstart = tok->wspace; 119 tok->wptr = tok->wspace; 120 tok->flags = 0; 121 tok->quote = Q_none; 122 123 return tok; 124 } 125 126 127 /* tok_reset(): 128 * Reset the tokenizer 129 */ 130 public void 131 tok_reset(tok) 132 Tokenizer *tok; 133 { 134 tok->argc = 0; 135 tok->wstart = tok->wspace; 136 tok->wptr = tok->wspace; 137 tok->flags = 0; 138 tok->quote = Q_none; 139 } 140 141 142 /* tok_end(): 143 * Clean up 144 */ 145 public void 146 tok_end(tok) 147 Tokenizer *tok; 148 { 149 tok_free((ptr_t) tok->ifs); 150 tok_free((ptr_t) tok->wspace); 151 tok_free((ptr_t) tok->argv); 152 tok_free((ptr_t) tok); 153 } 154 155 156 157 /* tok_line(): 158 * Bourne shell like tokenizing 159 * Return: 160 * -1: Internal error 161 * 3: Quoted return 162 * 2: Unmatched double quote 163 * 1: Unmatched single quote 164 * 0: Ok 165 */ 166 public int 167 tok_line(tok, line, argc, argv) 168 Tokenizer *tok; 169 const char* line; 170 int *argc; 171 char ***argv; 172 { 173 const char *ptr; 174 175 while (1) { 176 switch (*(ptr = line++)) { 177 case '\'': 178 tok->flags |= TOK_KEEP; 179 tok->flags &= ~TOK_EAT; 180 switch (tok->quote) { 181 case Q_none: 182 tok->quote = Q_single; /* Enter single quote mode */ 183 break; 184 185 case Q_single: /* Exit single quote mode */ 186 tok->quote = Q_none; 187 break; 188 189 case Q_one: /* Quote this ' */ 190 tok->quote = Q_none; 191 *tok->wptr++ = *ptr; 192 break; 193 194 case Q_double: /* Stay in double quote mode */ 195 *tok->wptr++ = *ptr; 196 break; 197 198 case Q_doubleone: /* Quote this ' */ 199 tok->quote = Q_double; 200 *tok->wptr++ = *ptr; 201 break; 202 203 default: 204 return(-1); 205 } 206 break; 207 208 case '"': 209 tok->flags &= ~TOK_EAT; 210 tok->flags |= TOK_KEEP; 211 switch (tok->quote) { 212 case Q_none: /* Enter double quote mode */ 213 tok->quote = Q_double; 214 break; 215 216 case Q_double: 217 tok->quote = Q_none; /* Exit double quote mode */ 218 break; 219 220 case Q_one: /* Quote this " */ 221 tok->quote = Q_none; 222 *tok->wptr++ = *ptr; 223 break; 224 225 case Q_single: /* Stay in single quote mode */ 226 *tok->wptr++ = *ptr; 227 break; 228 229 case Q_doubleone: /* Quote this " */ 230 tok->quote = Q_double; 231 *tok->wptr++ = *ptr; 232 break; 233 234 default: 235 return(-1); 236 } 237 break; 238 239 case '\\': 240 tok->flags |= TOK_KEEP; 241 tok->flags &= ~TOK_EAT; 242 switch (tok->quote) { 243 case Q_none: /* Quote next character */ 244 tok->quote = Q_one; 245 break; 246 247 case Q_double: 248 tok->quote = Q_doubleone;/* Quote next character */ 249 break; 250 251 case Q_one: 252 *tok->wptr++ = *ptr; 253 tok->quote = Q_none; /* Quote this, restore state */ 254 break; 255 256 case Q_single: /* Stay in single quote mode */ 257 *tok->wptr++ = *ptr; 258 break; 259 260 case Q_doubleone: /* Quote this \ */ 261 tok->quote = Q_double; 262 *tok->wptr++ = *ptr; 263 break; 264 265 default: 266 return(-1); 267 } 268 break; 269 270 case '\n': 271 tok->flags &= ~TOK_EAT; 272 switch (tok->quote) { 273 case Q_none: 274 tok_finish(tok); 275 *argv = tok->argv; 276 *argc = tok->argc; 277 return(0); 278 279 case Q_single: 280 case Q_double: 281 *tok->wptr++ = *ptr; /* Add the return */ 282 break; 283 284 case Q_doubleone: 285 tok->flags |= TOK_EAT; 286 tok->quote = Q_double; /* Back to double, eat the '\n' */ 287 break; 288 289 case Q_one: 290 tok->flags |= TOK_EAT; 291 tok->quote = Q_none; /* No quote, more eat the '\n' */ 292 break; 293 294 default: 295 return(0); 296 } 297 break; 298 299 case '\0': 300 switch (tok->quote) { 301 case Q_none: 302 /* Finish word and return */ 303 if (tok->flags & TOK_EAT) { 304 tok->flags &= ~TOK_EAT; 305 return 3; 306 } 307 tok_finish(tok); 308 *argv = tok->argv; 309 *argc = tok->argc; 310 return(0); 311 312 case Q_single: 313 return(1); 314 315 case Q_double: 316 return(2); 317 318 case Q_doubleone: 319 tok->quote = Q_double; 320 *tok->wptr++ = *ptr; 321 break; 322 323 case Q_one: 324 tok->quote = Q_none; 325 *tok->wptr++ = *ptr; 326 break; 327 328 default: 329 return(-1); 330 } 331 break; 332 333 default: 334 tok->flags &= ~TOK_EAT; 335 switch (tok->quote) { 336 case Q_none: 337 if (strchr(tok->ifs, *ptr) != NULL) 338 tok_finish(tok); 339 else 340 *tok->wptr++ = *ptr; 341 break; 342 343 case Q_single: 344 case Q_double: 345 *tok->wptr++ = *ptr; 346 break; 347 348 349 case Q_doubleone: 350 *tok->wptr++ = '\\'; 351 tok->quote = Q_double; 352 *tok->wptr++ = *ptr; 353 break; 354 355 case Q_one: 356 tok->quote = Q_none; 357 *tok->wptr++ = *ptr; 358 break; 359 360 default: 361 return(-1); 362 363 } 364 break; 365 } 366 367 if (tok->wptr >= tok->wmax - 4) { 368 size_t size = tok->wmax - tok->wspace + WINCR; 369 char *s = (char *) tok_realloc(tok->wspace, size); 370 /*SUPPRESS 22*/ 371 int offs = s - tok->wspace; 372 373 if (offs != 0) { 374 int i; 375 for (i = 0; i < tok->argc; i++) 376 tok->argv[i] = tok->argv[i] + offs; 377 tok->wptr = tok->wptr + offs; 378 tok->wstart = tok->wstart + offs; 379 tok->wmax = s + size; 380 tok->wspace = s; 381 } 382 } 383 384 if (tok->argc >= tok->amax - 4) { 385 tok->amax += AINCR; 386 tok->argv = (char **) tok_realloc(tok->argv, 387 tok->amax * sizeof(char*)); 388 } 389 390 } 391 } 392
Indexes created Thu Sep 25 06:09:39 GMT 2025