1 /*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas of Cornell University.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $NetBSD: tokenizer.c,v 1.15 2009/02/15 21:55:23 christos Exp $
33 */
34
35 #if !defined(lint) && !defined(SCCSID)
36 static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93";
37 #endif /* not lint && not SCCSID */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 /*
42 * tokenize.c: Bourne shell like tokenizer
43 */
44 #include "sys.h"
45 #include <string.h>
46 #include <stdlib.h>
47 #include "histedit.h"
48
49 typedef enum {
50 Q_none, Q_single, Q_double, Q_one, Q_doubleone
51 } quote_t;
52
53 #define IFS "\t \n"
54
55 #define TOK_KEEP 1
56 #define TOK_EAT 2
57
58 #define WINCR 20
59 #define AINCR 10
60
61 #define tok_strdup(a) strdup(a)
62 #define tok_malloc(a) malloc(a)
63 #define tok_free(a) free(a)
64 #define tok_realloc(a, b) realloc(a, b)
65
66
67 struct tokenizer {
68 char *ifs; /* In field separator */
69 int argc, amax; /* Current and maximum number of args */
70 char **argv; /* Argument list */
71 char *wptr, *wmax; /* Space and limit on the word buffer */
72 char *wstart; /* Beginning of next word */
73 char *wspace; /* Space of word buffer */
74 quote_t quote; /* Quoting state */
75 int flags; /* flags; */
76 };
77
78
79 private void tok_finish(Tokenizer *);
80
81
82 /* tok_finish():
83 * Finish a word in the tokenizer.
84 */
85 private void
tok_finish(Tokenizer * tok)86 tok_finish(Tokenizer *tok)
87 {
88
89 *tok->wptr = '\0';
90 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
91 tok->argv[tok->argc++] = tok->wstart;
92 tok->argv[tok->argc] = NULL;
93 tok->wstart = ++tok->wptr;
94 }
95 tok->flags &= ~TOK_KEEP;
96 }
97
98
99 /* tok_init():
100 * Initialize the tokenizer
101 */
102 public Tokenizer *
tok_init(const char * ifs)103 tok_init(const char *ifs)
104 {
105 Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer));
106
107 if (tok == NULL)
108 return NULL;
109 tok->ifs = tok_strdup(ifs ? ifs : IFS);
110 if (tok->ifs == NULL) {
111 tok_free((ptr_t)tok);
112 return NULL;
113 }
114 tok->argc = 0;
115 tok->amax = AINCR;
116 tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax);
117 if (tok->argv == NULL) {
118 tok_free((ptr_t)tok->ifs);
119 tok_free((ptr_t)tok);
120 return NULL;
121 }
122 tok->argv[0] = NULL;
123 tok->wspace = (char *) tok_malloc(WINCR);
124 if (tok->wspace == NULL) {
125 tok_free((ptr_t)tok->argv);
126 tok_free((ptr_t)tok->ifs);
127 tok_free((ptr_t)tok);
128 return NULL;
129 }
130 tok->wmax = tok->wspace + WINCR;
131 tok->wstart = tok->wspace;
132 tok->wptr = tok->wspace;
133 tok->flags = 0;
134 tok->quote = Q_none;
135
136 return (tok);
137 }
138
139
140 /* tok_reset():
141 * Reset the tokenizer
142 */
143 public void
tok_reset(Tokenizer * tok)144 tok_reset(Tokenizer *tok)
145 {
146
147 tok->argc = 0;
148 tok->wstart = tok->wspace;
149 tok->wptr = tok->wspace;
150 tok->flags = 0;
151 tok->quote = Q_none;
152 }
153
154
155 /* tok_end():
156 * Clean up
157 */
158 public void
tok_end(Tokenizer * tok)159 tok_end(Tokenizer *tok)
160 {
161
162 tok_free((ptr_t) tok->ifs);
163 tok_free((ptr_t) tok->wspace);
164 tok_free((ptr_t) tok->argv);
165 tok_free((ptr_t) tok);
166 }
167
168
169
170 /* tok_line():
171 * Bourne shell (sh(1)) like tokenizing
172 * Arguments:
173 * tok current tokenizer state (setup with tok_init())
174 * line line to parse
175 * Returns:
176 * -1 Internal error
177 * 3 Quoted return
178 * 2 Unmatched double quote
179 * 1 Unmatched single quote
180 * 0 Ok
181 * Modifies (if return value is 0):
182 * argc number of arguments
183 * argv argument array
184 * cursorc if !NULL, argv element containing cursor
185 * cursorv if !NULL, offset in argv[cursorc] of cursor
186 */
187 public int
tok_line(Tokenizer * tok,const LineInfo * line,int * argc,const char *** argv,int * cursorc,int * cursoro)188 tok_line(Tokenizer *tok, const LineInfo *line,
189 int *argc, const char ***argv, int *cursorc, int *cursoro)
190 {
191 const char *ptr;
192 int cc, co;
193
194 cc = co = -1;
195 ptr = line->buffer;
196 for (ptr = line->buffer; ;ptr++) {
197 if (ptr >= line->lastchar)
198 ptr = "";
199 if (ptr == line->cursor) {
200 cc = tok->argc;
201 co = (int)(tok->wptr - tok->wstart);
202 }
203 switch (*ptr) {
204 case '\'':
205 tok->flags |= TOK_KEEP;
206 tok->flags &= ~TOK_EAT;
207 switch (tok->quote) {
208 case Q_none:
209 tok->quote = Q_single; /* Enter single quote
210 * mode */
211 break;
212
213 case Q_single: /* Exit single quote mode */
214 tok->quote = Q_none;
215 break;
216
217 case Q_one: /* Quote this ' */
218 tok->quote = Q_none;
219 *tok->wptr++ = *ptr;
220 break;
221
222 case Q_double: /* Stay in double quote mode */
223 *tok->wptr++ = *ptr;
224 break;
225
226 case Q_doubleone: /* Quote this ' */
227 tok->quote = Q_double;
228 *tok->wptr++ = *ptr;
229 break;
230
231 default:
232 return (-1);
233 }
234 break;
235
236 case '"':
237 tok->flags &= ~TOK_EAT;
238 tok->flags |= TOK_KEEP;
239 switch (tok->quote) {
240 case Q_none: /* Enter double quote mode */
241 tok->quote = Q_double;
242 break;
243
244 case Q_double: /* Exit double quote mode */
245 tok->quote = Q_none;
246 break;
247
248 case Q_one: /* Quote this " */
249 tok->quote = Q_none;
250 *tok->wptr++ = *ptr;
251 break;
252
253 case Q_single: /* Stay in single quote mode */
254 *tok->wptr++ = *ptr;
255 break;
256
257 case Q_doubleone: /* Quote this " */
258 tok->quote = Q_double;
259 *tok->wptr++ = *ptr;
260 break;
261
262 default:
263 return (-1);
264 }
265 break;
266
267 case '\\':
268 tok->flags |= TOK_KEEP;
269 tok->flags &= ~TOK_EAT;
270 switch (tok->quote) {
271 case Q_none: /* Quote next character */
272 tok->quote = Q_one;
273 break;
274
275 case Q_double: /* Quote next character */
276 tok->quote = Q_doubleone;
277 break;
278
279 case Q_one: /* Quote this, restore state */
280 *tok->wptr++ = *ptr;
281 tok->quote = Q_none;
282 break;
283
284 case Q_single: /* Stay in single quote mode */
285 *tok->wptr++ = *ptr;
286 break;
287
288 case Q_doubleone: /* Quote this \ */
289 tok->quote = Q_double;
290 *tok->wptr++ = *ptr;
291 break;
292
293 default:
294 return (-1);
295 }
296 break;
297
298 case '\n':
299 tok->flags &= ~TOK_EAT;
300 switch (tok->quote) {
301 case Q_none:
302 goto tok_line_outok;
303
304 case Q_single:
305 case Q_double:
306 *tok->wptr++ = *ptr; /* Add the return */
307 break;
308
309 case Q_doubleone: /* Back to double, eat the '\n' */
310 tok->flags |= TOK_EAT;
311 tok->quote = Q_double;
312 break;
313
314 case Q_one: /* No quote, more eat the '\n' */
315 tok->flags |= TOK_EAT;
316 tok->quote = Q_none;
317 break;
318
319 default:
320 return (0);
321 }
322 break;
323
324 case '\0':
325 switch (tok->quote) {
326 case Q_none:
327 /* Finish word and return */
328 if (tok->flags & TOK_EAT) {
329 tok->flags &= ~TOK_EAT;
330 return (3);
331 }
332 goto tok_line_outok;
333
334 case Q_single:
335 return (1);
336
337 case Q_double:
338 return (2);
339
340 case Q_doubleone:
341 tok->quote = Q_double;
342 *tok->wptr++ = *ptr;
343 break;
344
345 case Q_one:
346 tok->quote = Q_none;
347 *tok->wptr++ = *ptr;
348 break;
349
350 default:
351 return (-1);
352 }
353 break;
354
355 default:
356 tok->flags &= ~TOK_EAT;
357 switch (tok->quote) {
358 case Q_none:
359 if (strchr(tok->ifs, *ptr) != NULL)
360 tok_finish(tok);
361 else
362 *tok->wptr++ = *ptr;
363 break;
364
365 case Q_single:
366 case Q_double:
367 *tok->wptr++ = *ptr;
368 break;
369
370
371 case Q_doubleone:
372 *tok->wptr++ = '\\';
373 tok->quote = Q_double;
374 *tok->wptr++ = *ptr;
375 break;
376
377 case Q_one:
378 tok->quote = Q_none;
379 *tok->wptr++ = *ptr;
380 break;
381
382 default:
383 return (-1);
384
385 }
386 break;
387 }
388
389 if (tok->wptr >= tok->wmax - 4) {
390 size_t size = tok->wmax - tok->wspace + WINCR;
391 char *s = (char *) tok_realloc(tok->wspace, size);
392 if (s == NULL)
393 return (-1);
394
395 if (s != tok->wspace) {
396 int i;
397 for (i = 0; i < tok->argc; i++) {
398 tok->argv[i] =
399 (tok->argv[i] - tok->wspace) + s;
400 }
401 tok->wptr = (tok->wptr - tok->wspace) + s;
402 tok->wstart = (tok->wstart - tok->wspace) + s;
403 tok->wspace = s;
404 }
405 tok->wmax = s + size;
406 }
407 if (tok->argc >= tok->amax - 4) {
408 char **p;
409 tok->amax += AINCR;
410 p = (char **) tok_realloc(tok->argv,
411 tok->amax * sizeof(char *));
412 if (p == NULL)
413 return (-1);
414 tok->argv = p;
415 }
416 }
417 tok_line_outok:
418 if (cc == -1 && co == -1) {
419 cc = tok->argc;
420 co = (int)(tok->wptr - tok->wstart);
421 }
422 if (cursorc != NULL)
423 *cursorc = cc;
424 if (cursoro != NULL)
425 *cursoro = co;
426 tok_finish(tok);
427 *argv = (const char **)tok->argv;
428 *argc = tok->argc;
429 return (0);
430 }
431
432 /* tok_str():
433 * Simpler version of tok_line, taking a NUL terminated line
434 * and splitting into words, ignoring cursor state.
435 */
436 public int
tok_str(Tokenizer * tok,const char * line,int * argc,const char *** argv)437 tok_str(Tokenizer *tok, const char *line, int *argc, const char ***argv)
438 {
439 LineInfo li;
440
441 memset(&li, 0, sizeof(li));
442 li.buffer = line;
443 li.cursor = li.lastchar = strchr(line, '\0');
444 return (tok_line(tok, &li, argc, argv, NULL, NULL));
445 }
446