1 /* $NetBSD: tokenizer.c,v 1.21 2011/08/16 16:25:15 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 1.21 2011/08/16 16:25:15 christos Exp $");
41 #endif
42 #endif /* not lint && not SCCSID */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 /* We build this file twice, once as NARROW, once as WIDE. */
47 /*
48 * tokenize.c: Bourne shell like tokenizer
49 */
50 #include <string.h>
51 #include <stdlib.h>
52 #include "histedit.h"
53 #include "chartype.h"
54
55 typedef enum {
56 Q_none, Q_single, Q_double, Q_one, Q_doubleone
57 } quote_t;
58
59 #define TOK_KEEP 1
60 #define TOK_EAT 2
61
62 #define WINCR 20
63 #define AINCR 10
64
65 #define IFS STR("\t \n")
66
67 #define tok_malloc(a) malloc(a)
68 #define tok_free(a) free(a)
69 #define tok_realloc(a, b) realloc(a, b)
70 #define tok_strdup(a) Strdup(a)
71
72
TYPE(tokenizer)73 struct TYPE(tokenizer) {
74 Char *ifs; /* In field separator */
75 size_t 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 FUN(tok,finish)(TYPE(Tokenizer) *);
86
87
88 /* FUN(tok,finish)():
89 * Finish a word in the tokenizer.
90 */
91 private void
FUN(tok,finish)92 FUN(tok,finish)(TYPE(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 /* FUN(tok,init)():
106 * Initialize the tokenizer
107 */
TYPE(Tokenizer)108 public TYPE(Tokenizer) *
109 FUN(tok,init)(const Char *ifs)
110 {
111 TYPE(Tokenizer) *tok = tok_malloc(sizeof(*tok));
112
113 if (tok == NULL)
114 return NULL;
115 tok->ifs = tok_strdup(ifs ? ifs : IFS);
116 if (tok->ifs == NULL) {
117 tok_free(tok);
118 return NULL;
119 }
120 tok->argc = 0;
121 tok->amax = AINCR;
122 tok->argv = tok_malloc(sizeof(*tok->argv) * tok->amax);
123 if (tok->argv == NULL) {
124 tok_free(tok->ifs);
125 tok_free(tok);
126 return NULL;
127 }
128 tok->argv[0] = NULL;
129 tok->wspace = tok_malloc(WINCR * sizeof(*tok->wspace));
130 if (tok->wspace == NULL) {
131 tok_free(tok->argv);
132 tok_free(tok->ifs);
133 tok_free(tok);
134 return NULL;
135 }
136 tok->wmax = tok->wspace + WINCR;
137 tok->wstart = tok->wspace;
138 tok->wptr = tok->wspace;
139 tok->flags = 0;
140 tok->quote = Q_none;
141
142 return tok;
143 }
144
145
146 /* FUN(tok,reset)():
147 * Reset the tokenizer
148 */
149 public void
FUN(tok,reset)150 FUN(tok,reset)(TYPE(Tokenizer) *tok)
151 {
152
153 tok->argc = 0;
154 tok->wstart = tok->wspace;
155 tok->wptr = tok->wspace;
156 tok->flags = 0;
157 tok->quote = Q_none;
158 }
159
160
161 /* FUN(tok,end)():
162 * Clean up
163 */
164 public void
FUN(tok,end)165 FUN(tok,end)(TYPE(Tokenizer) *tok)
166 {
167
168 tok_free(tok->ifs);
169 tok_free(tok->wspace);
170 tok_free(tok->argv);
171 tok_free(tok);
172 }
173
174
175
176 /* FUN(tok,line)():
177 * Bourne shell (sh(1)) like tokenizing
178 * Arguments:
179 * tok current tokenizer state (setup with FUN(tok,init)())
180 * line line to parse
181 * Returns:
182 * -1 Internal error
183 * 3 Quoted return
184 * 2 Unmatched double quote
185 * 1 Unmatched single quote
186 * 0 Ok
187 * Modifies (if return value is 0):
188 * argc number of arguments
189 * argv argument array
190 * cursorc if !NULL, argv element containing cursor
191 * cursorv if !NULL, offset in argv[cursorc] of cursor
192 */
193 public int
FUN(tok,line)194 FUN(tok,line)(TYPE(Tokenizer) *tok, const TYPE(LineInfo) *line,
195 int *argc, const Char ***argv, int *cursorc, int *cursoro)
196 {
197 const Char *ptr;
198 int cc, co;
199
200 cc = co = -1;
201 ptr = line->buffer;
202 for (ptr = line->buffer; ;ptr++) {
203 if (ptr >= line->lastchar)
204 ptr = STR("");
205 if (ptr == line->cursor) {
206 cc = (int)tok->argc;
207 co = (int)(tok->wptr - tok->wstart);
208 }
209 switch (*ptr) {
210 case '\'':
211 tok->flags |= TOK_KEEP;
212 tok->flags &= ~TOK_EAT;
213 switch (tok->quote) {
214 case Q_none:
215 tok->quote = Q_single; /* Enter single quote
216 * mode */
217 break;
218
219 case Q_single: /* Exit single quote mode */
220 tok->quote = Q_none;
221 break;
222
223 case Q_one: /* Quote this ' */
224 tok->quote = Q_none;
225 *tok->wptr++ = *ptr;
226 break;
227
228 case Q_double: /* Stay in double quote mode */
229 *tok->wptr++ = *ptr;
230 break;
231
232 case Q_doubleone: /* Quote this ' */
233 tok->quote = Q_double;
234 *tok->wptr++ = *ptr;
235 break;
236
237 default:
238 return -1;
239 }
240 break;
241
242 case '"':
243 tok->flags &= ~TOK_EAT;
244 tok->flags |= TOK_KEEP;
245 switch (tok->quote) {
246 case Q_none: /* Enter double quote mode */
247 tok->quote = Q_double;
248 break;
249
250 case Q_double: /* Exit double quote mode */
251 tok->quote = Q_none;
252 break;
253
254 case Q_one: /* Quote this " */
255 tok->quote = Q_none;
256 *tok->wptr++ = *ptr;
257 break;
258
259 case Q_single: /* Stay in single quote mode */
260 *tok->wptr++ = *ptr;
261 break;
262
263 case Q_doubleone: /* Quote this " */
264 tok->quote = Q_double;
265 *tok->wptr++ = *ptr;
266 break;
267
268 default:
269 return -1;
270 }
271 break;
272
273 case '\\':
274 tok->flags |= TOK_KEEP;
275 tok->flags &= ~TOK_EAT;
276 switch (tok->quote) {
277 case Q_none: /* Quote next character */
278 tok->quote = Q_one;
279 break;
280
281 case Q_double: /* Quote next character */
282 tok->quote = Q_doubleone;
283 break;
284
285 case Q_one: /* Quote this, restore state */
286 *tok->wptr++ = *ptr;
287 tok->quote = Q_none;
288 break;
289
290 case Q_single: /* Stay in single quote mode */
291 *tok->wptr++ = *ptr;
292 break;
293
294 case Q_doubleone: /* Quote this \ */
295 tok->quote = Q_double;
296 *tok->wptr++ = *ptr;
297 break;
298
299 default:
300 return -1;
301 }
302 break;
303
304 case '\n':
305 tok->flags &= ~TOK_EAT;
306 switch (tok->quote) {
307 case Q_none:
308 goto tok_line_outok;
309
310 case Q_single:
311 case Q_double:
312 *tok->wptr++ = *ptr; /* Add the return */
313 break;
314
315 case Q_doubleone: /* Back to double, eat the '\n' */
316 tok->flags |= TOK_EAT;
317 tok->quote = Q_double;
318 break;
319
320 case Q_one: /* No quote, more eat the '\n' */
321 tok->flags |= TOK_EAT;
322 tok->quote = Q_none;
323 break;
324
325 default:
326 return 0;
327 }
328 break;
329
330 case '\0':
331 switch (tok->quote) {
332 case Q_none:
333 /* Finish word and return */
334 if (tok->flags & TOK_EAT) {
335 tok->flags &= ~TOK_EAT;
336 return 3;
337 }
338 goto tok_line_outok;
339
340 case Q_single:
341 return 1;
342
343 case Q_double:
344 return 2;
345
346 case Q_doubleone:
347 tok->quote = Q_double;
348 *tok->wptr++ = *ptr;
349 break;
350
351 case Q_one:
352 tok->quote = Q_none;
353 *tok->wptr++ = *ptr;
354 break;
355
356 default:
357 return -1;
358 }
359 break;
360
361 default:
362 tok->flags &= ~TOK_EAT;
363 switch (tok->quote) {
364 case Q_none:
365 if (Strchr(tok->ifs, *ptr) != NULL)
366 FUN(tok,finish)(tok);
367 else
368 *tok->wptr++ = *ptr;
369 break;
370
371 case Q_single:
372 case Q_double:
373 *tok->wptr++ = *ptr;
374 break;
375
376
377 case Q_doubleone:
378 *tok->wptr++ = '\\';
379 tok->quote = Q_double;
380 *tok->wptr++ = *ptr;
381 break;
382
383 case Q_one:
384 tok->quote = Q_none;
385 *tok->wptr++ = *ptr;
386 break;
387
388 default:
389 return -1;
390
391 }
392 break;
393 }
394
395 if (tok->wptr >= tok->wmax - 4) {
396 size_t size = (size_t)(tok->wmax - tok->wspace + WINCR);
397 Char *s = tok_realloc(tok->wspace,
398 size * sizeof(*s));
399 if (s == NULL)
400 return -1;
401
402 if (s != tok->wspace) {
403 size_t i;
404 for (i = 0; i < tok->argc; i++) {
405 tok->argv[i] =
406 (tok->argv[i] - tok->wspace) + s;
407 }
408 tok->wptr = (tok->wptr - tok->wspace) + s;
409 tok->wstart = (tok->wstart - tok->wspace) + s;
410 tok->wspace = s;
411 }
412 tok->wmax = s + size;
413 }
414 if (tok->argc >= tok->amax - 4) {
415 Char **p;
416 tok->amax += AINCR;
417 p = tok_realloc(tok->argv, tok->amax * sizeof(*p));
418 if (p == NULL)
419 return -1;
420 tok->argv = p;
421 }
422 }
423 tok_line_outok:
424 if (cc == -1 && co == -1) {
425 cc = (int)tok->argc;
426 co = (int)(tok->wptr - tok->wstart);
427 }
428 if (cursorc != NULL)
429 *cursorc = cc;
430 if (cursoro != NULL)
431 *cursoro = co;
432 FUN(tok,finish)(tok);
433 *argv = (const Char **)tok->argv;
434 *argc = (int)tok->argc;
435 return 0;
436 }
437
438 /* FUN(tok,str)():
439 * Simpler version of tok_line, taking a NUL terminated line
440 * and splitting into words, ignoring cursor state.
441 */
442 public int
FUN(tok,str)443 FUN(tok,str)(TYPE(Tokenizer) *tok, const Char *line, int *argc,
444 const Char ***argv)
445 {
446 TYPE(LineInfo) li;
447
448 memset(&li, 0, sizeof(li));
449 li.buffer = line;
450 li.cursor = li.lastchar = Strchr(line, '\0');
451 return FUN(tok,line(tok, &li, argc, argv, NULL, NULL));
452 }
453