tokenizer.c revision 1.6
1 /* $NetBSD: tokenizer.c,v 1.6 2000/09/04 22:06:33 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 #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 1.6 2000/09/04 22:06:33 lukem 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 { 57 Q_none, Q_single, Q_double, Q_one, Q_doubleone 58 } quote_t; 59 60 #define IFS "\t \n" 61 62 #define TOK_KEEP 1 63 #define TOK_EAT 2 64 65 #define WINCR 20 66 #define AINCR 10 67 68 #define tok_malloc(a) malloc(a) 69 #define tok_free(a) free(a) 70 #define tok_realloc(a, b) realloc(a, b) 71 72 73 struct tokenizer { 74 char *ifs; /* In field separator */ 75 int argc, amax; /* Current and maximum number of args */ 76 char **argv; /* Argument list */ 77 char *wptr, *wmax; /* Space and limit on the word buffer */ 78 char *wstart; /* Beginning of next word */ 79 char *wspace; /* Space of word buffer */ 80 quote_t quote; /* Quoting state */ 81 int flags; /* flags; */ 82 }; 83 84 85 private void tok_finish(Tokenizer *); 86 87 88 /* tok_finish(): 89 * Finish a word in the tokenizer. 90 */ 91 private void 92 tok_finish(Tokenizer *tok) 93 { 94 95 *tok->wptr = '\0'; 96 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { 97 tok->argv[tok->argc++] = tok->wstart; 98 tok->argv[tok->argc] = NULL; 99 tok->wstart = ++tok->wptr; 100 } 101 tok->flags &= ~TOK_KEEP; 102 } 103 104 105 /* tok_init(): 106 * Initialize the tokenizer 107 */ 108 public Tokenizer * 109 tok_init(const char *ifs) 110 { 111 Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer)); 112 113 tok->ifs = strdup(ifs ? ifs : IFS); 114 tok->argc = 0; 115 tok->amax = AINCR; 116 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); 117 tok->argv[0] = NULL; 118 tok->wspace = (char *) tok_malloc(WINCR); 119 tok->wmax = tok->wspace + WINCR; 120 tok->wstart = tok->wspace; 121 tok->wptr = tok->wspace; 122 tok->flags = 0; 123 tok->quote = Q_none; 124 125 return (tok); 126 } 127 128 129 /* tok_reset(): 130 * Reset the tokenizer 131 */ 132 public void 133 tok_reset(Tokenizer *tok) 134 { 135 136 tok->argc = 0; 137 tok->wstart = tok->wspace; 138 tok->wptr = tok->wspace; 139 tok->flags = 0; 140 tok->quote = Q_none; 141 } 142 143 144 /* tok_end(): 145 * Clean up 146 */ 147 public void 148 tok_end(Tokenizer *tok) 149 { 150 151 tok_free((ptr_t) tok->ifs); 152 tok_free((ptr_t) tok->wspace); 153 tok_free((ptr_t) tok->argv); 154 tok_free((ptr_t) tok); 155 } 156 157 158 159 /* tok_line(): 160 * Bourne shell like tokenizing 161 * Return: 162 * -1: Internal error 163 * 3: Quoted return 164 * 2: Unmatched double quote 165 * 1: Unmatched single quote 166 * 0: Ok 167 */ 168 public int 169 tok_line(Tokenizer *tok, const char *line, int *argc, char ***argv) 170 { 171 const char *ptr; 172 173 for (;;) { 174 switch (*(ptr = line++)) { 175 case '\'': 176 tok->flags |= TOK_KEEP; 177 tok->flags &= ~TOK_EAT; 178 switch (tok->quote) { 179 case Q_none: 180 tok->quote = Q_single; /* Enter single quote 181 * mode */ 182 break; 183 184 case Q_single: /* Exit single quote mode */ 185 tok->quote = Q_none; 186 break; 187 188 case Q_one: /* Quote this ' */ 189 tok->quote = Q_none; 190 *tok->wptr++ = *ptr; 191 break; 192 193 case Q_double: /* Stay in double quote mode */ 194 *tok->wptr++ = *ptr; 195 break; 196 197 case Q_doubleone: /* Quote this ' */ 198 tok->quote = Q_double; 199 *tok->wptr++ = *ptr; 200 break; 201 202 default: 203 return (-1); 204 } 205 break; 206 207 case '"': 208 tok->flags &= ~TOK_EAT; 209 tok->flags |= TOK_KEEP; 210 switch (tok->quote) { 211 case Q_none: /* Enter double quote mode */ 212 tok->quote = Q_double; 213 break; 214 215 case Q_double: /* Exit double 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_single: /* Stay in single 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_KEEP; 240 tok->flags &= ~TOK_EAT; 241 switch (tok->quote) { 242 case Q_none: /* Quote next character */ 243 tok->quote = Q_one; 244 break; 245 246 case Q_double: /* Quote next character */ 247 tok->quote = Q_doubleone; 248 break; 249 250 case Q_one: /* Quote this, restore state */ 251 *tok->wptr++ = *ptr; 252 tok->quote = Q_none; 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 '\n': 270 tok->flags &= ~TOK_EAT; 271 switch (tok->quote) { 272 case Q_none: 273 tok_finish(tok); 274 *argv = tok->argv; 275 *argc = tok->argc; 276 return (0); 277 278 case Q_single: 279 case Q_double: 280 *tok->wptr++ = *ptr; /* Add the return */ 281 break; 282 283 case Q_doubleone: /* Back to double, eat the '\n' */ 284 tok->flags |= TOK_EAT; 285 tok->quote = Q_double; 286 break; 287 288 case Q_one: /* No quote, more eat the '\n' */ 289 tok->flags |= TOK_EAT; 290 tok->quote = Q_none; 291 break; 292 293 default: 294 return (0); 295 } 296 break; 297 298 case '\0': 299 switch (tok->quote) { 300 case Q_none: 301 /* Finish word and return */ 302 if (tok->flags & TOK_EAT) { 303 tok->flags &= ~TOK_EAT; 304 return (3); 305 } 306 tok_finish(tok); 307 *argv = tok->argv; 308 *argc = tok->argc; 309 return (0); 310 311 case Q_single: 312 return (1); 313 314 case Q_double: 315 return (2); 316 317 case Q_doubleone: 318 tok->quote = Q_double; 319 *tok->wptr++ = *ptr; 320 break; 321 322 case Q_one: 323 tok->quote = Q_none; 324 *tok->wptr++ = *ptr; 325 break; 326 327 default: 328 return (-1); 329 } 330 break; 331 332 default: 333 tok->flags &= ~TOK_EAT; 334 switch (tok->quote) { 335 case Q_none: 336 if (strchr(tok->ifs, *ptr) != NULL) 337 tok_finish(tok); 338 else 339 *tok->wptr++ = *ptr; 340 break; 341 342 case Q_single: 343 case Q_double: 344 *tok->wptr++ = *ptr; 345 break; 346 347 348 case Q_doubleone: 349 *tok->wptr++ = '\\'; 350 tok->quote = Q_double; 351 *tok->wptr++ = *ptr; 352 break; 353 354 case Q_one: 355 tok->quote = Q_none; 356 *tok->wptr++ = *ptr; 357 break; 358 359 default: 360 return (-1); 361 362 } 363 break; 364 } 365 366 if (tok->wptr >= tok->wmax - 4) { 367 size_t size = tok->wmax - tok->wspace + WINCR; 368 char *s = (char *) tok_realloc(tok->wspace, size); 369 /* SUPPRESS 22 */ 370 int offs = s - tok->wspace; 371 372 if (offs != 0) { 373 int i; 374 for (i = 0; i < tok->argc; i++) 375 tok->argv[i] = tok->argv[i] + offs; 376 tok->wptr = tok->wptr + offs; 377 tok->wstart = tok->wstart + offs; 378 tok->wmax = s + size; 379 tok->wspace = s; 380 } 381 } 382 if (tok->argc >= tok->amax - 4) { 383 tok->amax += AINCR; 384 tok->argv = (char **) tok_realloc(tok->argv, 385 tok->amax * sizeof(char *)); 386 } 387 } 388 } 389
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