source: heimdal/trunk/lib/libedit/src/tokenizer.c

Last change on this file was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 9.9 KB
Line 
1/* $NetBSD: tokenizer.c,v 1.18 2010/01/03 18:27:10 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#ifndef NARROWCHAR
36#include "config.h"
37#endif
38
39#if !defined(lint) && !defined(SCCSID)
40#if 0
41static char sccsid[] = "@(#)tokenizer.c 8.1 (Berkeley) 6/4/93";
42#else
43__RCSID("$NetBSD: tokenizer.c,v 1.18 2010/01/03 18:27:10 christos Exp $");
44#endif
45#endif /* not lint && not SCCSID */
46
47/* We build this file twice, once as NARROW, once as WIDE. */
48/*
49 * tokenize.c: Bourne shell like tokenizer
50 */
51#include <string.h>
52#include <stdlib.h>
53#include "histedit.h"
54#include "chartype.h"
55
56typedef enum {
57 Q_none, Q_single, Q_double, Q_one, Q_doubleone
58} quote_t;
59
60#define TOK_KEEP 1
61#define TOK_EAT 2
62
63#define WINCR 20
64#define AINCR 10
65
66#define IFS STR("\t \n")
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#define tok_strdup(a) Strdup(a)
72
73
74struct TYPE(tokenizer) {
75 Char *ifs; /* In field separator */
76 int argc, amax; /* Current and maximum number of args */
77 Char **argv; /* Argument list */
78 Char *wptr, *wmax; /* Space and limit on the word buffer */
79 Char *wstart; /* Beginning of next word */
80 Char *wspace; /* Space of word buffer */
81 quote_t quote; /* Quoting state */
82 int flags; /* flags; */
83};
84
85
86private void FUN(tok,finish)(TYPE(Tokenizer) *);
87
88
89/* FUN(tok,finish)():
90 * Finish a word in the tokenizer.
91 */
92private void
93FUN(tok,finish)(TYPE(Tokenizer) *tok)
94{
95
96 *tok->wptr = '\0';
97 if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
98 tok->argv[tok->argc++] = tok->wstart;
99 tok->argv[tok->argc] = NULL;
100 tok->wstart = ++tok->wptr;
101 }
102 tok->flags &= ~TOK_KEEP;
103}
104
105
106/* FUN(tok,init)():
107 * Initialize the tokenizer
108 */
109public TYPE(Tokenizer) *
110FUN(tok,init)(const Char *ifs)
111{
112 TYPE(Tokenizer) *tok = tok_malloc(sizeof(TYPE(Tokenizer)));
113
114 if (tok == NULL)
115 return NULL;
116 tok->ifs = tok_strdup(ifs ? ifs : IFS);
117 if (tok->ifs == NULL) {
118 tok_free((ptr_t)tok);
119 return NULL;
120 }
121 tok->argc = 0;
122 tok->amax = AINCR;
123 tok->argv = tok_malloc(sizeof(*tok->argv) * tok->amax);
124 if (tok->argv == NULL) {
125 tok_free((ptr_t)tok->ifs);
126 tok_free((ptr_t)tok);
127 return NULL;
128 }
129 tok->argv[0] = NULL;
130 tok->wspace = tok_malloc(WINCR * sizeof(*tok->wspace));
131 if (tok->wspace == NULL) {
132 tok_free((ptr_t)tok->argv);
133 tok_free((ptr_t)tok->ifs);
134 tok_free((ptr_t)tok);
135 return NULL;
136 }
137 tok->wmax = tok->wspace + WINCR;
138 tok->wstart = tok->wspace;
139 tok->wptr = tok->wspace;
140 tok->flags = 0;
141 tok->quote = Q_none;
142
143 return (tok);
144}
145
146
147/* FUN(tok,reset)():
148 * Reset the tokenizer
149 */
150public void
151FUN(tok,reset)(TYPE(Tokenizer) *tok)
152{
153
154 tok->argc = 0;
155 tok->wstart = tok->wspace;
156 tok->wptr = tok->wspace;
157 tok->flags = 0;
158 tok->quote = Q_none;
159}
160
161
162/* FUN(tok,end)():
163 * Clean up
164 */
165public void
166FUN(tok,end)(TYPE(Tokenizer) *tok)
167{
168
169 tok_free((ptr_t) tok->ifs);
170 tok_free((ptr_t) tok->wspace);
171 tok_free((ptr_t) tok->argv);
172 tok_free((ptr_t) tok);
173}
174
175
176
177/* FUN(tok,line)():
178 * Bourne shell (sh(1)) like tokenizing
179 * Arguments:
180 * tok current tokenizer state (setup with FUN(tok,init)())
181 * line line to parse
182 * Returns:
183 * -1 Internal error
184 * 3 Quoted return
185 * 2 Unmatched double quote
186 * 1 Unmatched single quote
187 * 0 Ok
188 * Modifies (if return value is 0):
189 * argc number of arguments
190 * argv argument array
191 * cursorc if !NULL, argv element containing cursor
192 * cursorv if !NULL, offset in argv[cursorc] of cursor
193 */
194public int
195FUN(tok,line)(TYPE(Tokenizer) *tok, const TYPE(LineInfo) *line,
196 int *argc, const Char ***argv, int *cursorc, int *cursoro)
197{
198 const Char *ptr;
199 int cc, co;
200
201 cc = co = -1;
202 ptr = line->buffer;
203 for (ptr = line->buffer; ;ptr++) {
204 if (ptr >= line->lastchar)
205 ptr = STR("");
206 if (ptr == line->cursor) {
207 cc = tok->argc;
208 co = (int)(tok->wptr - tok->wstart);
209 }
210 switch (*ptr) {
211 case '\'':
212 tok->flags |= TOK_KEEP;
213 tok->flags &= ~TOK_EAT;
214 switch (tok->quote) {
215 case Q_none:
216 tok->quote = Q_single; /* Enter single quote
217 * mode */
218 break;
219
220 case Q_single: /* Exit single quote mode */
221 tok->quote = Q_none;
222 break;
223
224 case Q_one: /* Quote this ' */
225 tok->quote = Q_none;
226 *tok->wptr++ = *ptr;
227 break;
228
229 case Q_double: /* Stay in double quote mode */
230 *tok->wptr++ = *ptr;
231 break;
232
233 case Q_doubleone: /* Quote this ' */
234 tok->quote = Q_double;
235 *tok->wptr++ = *ptr;
236 break;
237
238 default:
239 return (-1);
240 }
241 break;
242
243 case '"':
244 tok->flags &= ~TOK_EAT;
245 tok->flags |= TOK_KEEP;
246 switch (tok->quote) {
247 case Q_none: /* Enter double quote mode */
248 tok->quote = Q_double;
249 break;
250
251 case Q_double: /* Exit double quote mode */
252 tok->quote = Q_none;
253 break;
254
255 case Q_one: /* Quote this " */
256 tok->quote = Q_none;
257 *tok->wptr++ = *ptr;
258 break;
259
260 case Q_single: /* Stay in single quote mode */
261 *tok->wptr++ = *ptr;
262 break;
263
264 case Q_doubleone: /* Quote this " */
265 tok->quote = Q_double;
266 *tok->wptr++ = *ptr;
267 break;
268
269 default:
270 return (-1);
271 }
272 break;
273
274 case '\\':
275 tok->flags |= TOK_KEEP;
276 tok->flags &= ~TOK_EAT;
277 switch (tok->quote) {
278 case Q_none: /* Quote next character */
279 tok->quote = Q_one;
280 break;
281
282 case Q_double: /* Quote next character */
283 tok->quote = Q_doubleone;
284 break;
285
286 case Q_one: /* Quote this, restore state */
287 *tok->wptr++ = *ptr;
288 tok->quote = Q_none;
289 break;
290
291 case Q_single: /* Stay in single quote mode */
292 *tok->wptr++ = *ptr;
293 break;
294
295 case Q_doubleone: /* Quote this \ */
296 tok->quote = Q_double;
297 *tok->wptr++ = *ptr;
298 break;
299
300 default:
301 return (-1);
302 }
303 break;
304
305 case '\n':
306 tok->flags &= ~TOK_EAT;
307 switch (tok->quote) {
308 case Q_none:
309 goto tok_line_outok;
310
311 case Q_single:
312 case Q_double:
313 *tok->wptr++ = *ptr; /* Add the return */
314 break;
315
316 case Q_doubleone: /* Back to double, eat the '\n' */
317 tok->flags |= TOK_EAT;
318 tok->quote = Q_double;
319 break;
320
321 case Q_one: /* No quote, more eat the '\n' */
322 tok->flags |= TOK_EAT;
323 tok->quote = Q_none;
324 break;
325
326 default:
327 return (0);
328 }
329 break;
330
331 case '\0':
332 switch (tok->quote) {
333 case Q_none:
334 /* Finish word and return */
335 if (tok->flags & TOK_EAT) {
336 tok->flags &= ~TOK_EAT;
337 return (3);
338 }
339 goto tok_line_outok;
340
341 case Q_single:
342 return (1);
343
344 case Q_double:
345 return (2);
346
347 case Q_doubleone:
348 tok->quote = Q_double;
349 *tok->wptr++ = *ptr;
350 break;
351
352 case Q_one:
353 tok->quote = Q_none;
354 *tok->wptr++ = *ptr;
355 break;
356
357 default:
358 return (-1);
359 }
360 break;
361
362 default:
363 tok->flags &= ~TOK_EAT;
364 switch (tok->quote) {
365 case Q_none:
366 if (Strchr(tok->ifs, *ptr) != NULL)
367 FUN(tok,finish)(tok);
368 else
369 *tok->wptr++ = *ptr;
370 break;
371
372 case Q_single:
373 case Q_double:
374 *tok->wptr++ = *ptr;
375 break;
376
377
378 case Q_doubleone:
379 *tok->wptr++ = '\\';
380 tok->quote = Q_double;
381 *tok->wptr++ = *ptr;
382 break;
383
384 case Q_one:
385 tok->quote = Q_none;
386 *tok->wptr++ = *ptr;
387 break;
388
389 default:
390 return (-1);
391
392 }
393 break;
394 }
395
396 if (tok->wptr >= tok->wmax - 4) {
397 size_t size = tok->wmax - tok->wspace + WINCR;
398 Char *s = tok_realloc(tok->wspace,
399 size * sizeof(*s));
400 if (s == NULL)
401 return (-1);
402
403 if (s != tok->wspace) {
404 int i;
405 for (i = 0; i < tok->argc; i++) {
406 tok->argv[i] =
407 (tok->argv[i] - tok->wspace) + s;
408 }
409 tok->wptr = (tok->wptr - tok->wspace) + s;
410 tok->wstart = (tok->wstart - tok->wspace) + s;
411 tok->wspace = s;
412 }
413 tok->wmax = s + size;
414 }
415 if (tok->argc >= tok->amax - 4) {
416 Char **p;
417 tok->amax += AINCR;
418 p = tok_realloc(tok->argv, tok->amax * sizeof(*p));
419 if (p == NULL)
420 return (-1);
421 tok->argv = p;
422 }
423 }
424 tok_line_outok:
425 if (cc == -1 && co == -1) {
426 cc = tok->argc;
427 co = (int)(tok->wptr - tok->wstart);
428 }
429 if (cursorc != NULL)
430 *cursorc = cc;
431 if (cursoro != NULL)
432 *cursoro = co;
433 FUN(tok,finish)(tok);
434 *argv = (const Char **)tok->argv;
435 *argc = tok->argc;
436 return (0);
437}
438
439/* FUN(tok,str)():
440 * Simpler version of tok_line, taking a NUL terminated line
441 * and splitting into words, ignoring cursor state.
442 */
443public int
444FUN(tok,str)(TYPE(Tokenizer) *tok, const Char *line, int *argc,
445 const Char ***argv)
446{
447 TYPE(LineInfo) li;
448
449 memset(&li, 0, sizeof(li));
450 li.buffer = line;
451 li.cursor = li.lastchar = Strchr(line, '\0');
452 return (FUN(tok,line)(tok, &li, argc, argv, NULL, NULL));
453}
Note: See TracBrowser for help on using the repository browser.