1/*	$NetBSD: tokenizer.c,v 1.28 2016/04/11 18:56:31 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
38static char sccsid[] = "@(#)tokenizer.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: tokenizer.c,v 1.28 2016/04/11 18:56:31 christos Exp $");
41#endif
42#endif /* not lint && not SCCSID */
43
44/* We build this file twice, once as NARROW, once as WIDE. */
45/*
46 * tokenize.c: Bourne shell like tokenizer
47 */
48#include <stdlib.h>
49#include <string.h>
50
51#include "histedit.h"
52
53typedef enum {
54	Q_none, Q_single, Q_double, Q_one, Q_doubleone
55} quote_t;
56
57#define	TOK_KEEP	1
58#define	TOK_EAT		2
59
60#define	WINCR		20
61#define	AINCR		10
62
63#define	IFS		STR("\t \n")
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#ifdef NARROWCHAR
70#define	Char			char
71#define	FUN(prefix, rest)	prefix ## _ ## rest
72#define	TYPE(type)		type
73#define	STR(x)			x
74#define	Strchr(s, c)		strchr(s, c)
75#define	tok_strdup(s)		strdup(s)
76#else
77#define	Char			wchar_t
78#define	FUN(prefix, rest)	prefix ## _w ## rest
79#define	TYPE(type)		type ## W
80#define	STR(x)			L ## x
81#define	Strchr(s, c)		wcschr(s, c)
82#define	tok_strdup(s)		wcsdup(s)
83#endif
84
85struct TYPE(tokenizer) {
86	Char	*ifs;		/* In field separator			 */
87	size_t	 argc, amax;	/* Current and maximum number of args	 */
88	Char   **argv;		/* Argument list			 */
89	Char	*wptr, *wmax;	/* Space and limit on the word buffer	 */
90	Char	*wstart;	/* Beginning of next word		 */
91	Char	*wspace;	/* Space of word buffer			 */
92	quote_t	 quote;		/* Quoting state			 */
93	int	 flags;		/* flags;				 */
94};
95
96
97static void FUN(tok,finish)(TYPE(Tokenizer) *);
98
99
100/* FUN(tok,finish)():
101 *	Finish a word in the tokenizer.
102 */
103static void
104FUN(tok,finish)(TYPE(Tokenizer) *tok)
105{
106
107	*tok->wptr = '\0';
108	if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
109		tok->argv[tok->argc++] = tok->wstart;
110		tok->argv[tok->argc] = NULL;
111		tok->wstart = ++tok->wptr;
112	}
113	tok->flags &= ~TOK_KEEP;
114}
115
116
117/* FUN(tok,init)():
118 *	Initialize the tokenizer
119 */
120TYPE(Tokenizer) *
121FUN(tok,init)(const Char *ifs)
122{
123	TYPE(Tokenizer) *tok = tok_malloc(sizeof(*tok));
124
125	if (tok == NULL)
126		return NULL;
127	tok->ifs = tok_strdup(ifs ? ifs : IFS);
128	if (tok->ifs == NULL) {
129		tok_free(tok);
130		return NULL;
131	}
132	tok->argc = 0;
133	tok->amax = AINCR;
134	tok->argv = tok_malloc(sizeof(*tok->argv) * tok->amax);
135	if (tok->argv == NULL) {
136		tok_free(tok->ifs);
137		tok_free(tok);
138		return NULL;
139	}
140	tok->argv[0] = NULL;
141	tok->wspace = tok_malloc(WINCR * sizeof(*tok->wspace));
142	if (tok->wspace == NULL) {
143		tok_free(tok->argv);
144		tok_free(tok->ifs);
145		tok_free(tok);
146		return NULL;
147	}
148	tok->wmax = tok->wspace + WINCR;
149	tok->wstart = tok->wspace;
150	tok->wptr = tok->wspace;
151	tok->flags = 0;
152	tok->quote = Q_none;
153
154	return tok;
155}
156
157
158/* FUN(tok,reset)():
159 *	Reset the tokenizer
160 */
161void
162FUN(tok,reset)(TYPE(Tokenizer) *tok)
163{
164
165	tok->argc = 0;
166	tok->wstart = tok->wspace;
167	tok->wptr = tok->wspace;
168	tok->flags = 0;
169	tok->quote = Q_none;
170}
171
172
173/* FUN(tok,end)():
174 *	Clean up
175 */
176void
177FUN(tok,end)(TYPE(Tokenizer) *tok)
178{
179
180	tok_free(tok->ifs);
181	tok_free(tok->wspace);
182	tok_free(tok->argv);
183	tok_free(tok);
184}
185
186
187
188/* FUN(tok,line)():
189 *	Bourne shell (sh(1)) like tokenizing
190 *	Arguments:
191 *		tok	current tokenizer state (setup with FUN(tok,init)())
192 *		line	line to parse
193 *	Returns:
194 *		-1	Internal error
195 *		 3	Quoted return
196 *		 2	Unmatched double quote
197 *		 1	Unmatched single quote
198 *		 0	Ok
199 *	Modifies (if return value is 0):
200 *		argc	number of arguments
201 *		argv	argument array
202 *		cursorc	if !NULL, argv element containing cursor
203 *		cursorv	if !NULL, offset in argv[cursorc] of cursor
204 */
205int
206FUN(tok,line)(TYPE(Tokenizer) *tok, const TYPE(LineInfo) *line,
207    int *argc, const Char ***argv, int *cursorc, int *cursoro)
208{
209	const Char *ptr;
210	int cc, co;
211
212	cc = co = -1;
213	ptr = line->buffer;
214	for (ptr = line->buffer; ;ptr++) {
215		if (ptr >= line->lastchar)
216			ptr = STR("");
217		if (ptr == line->cursor) {
218			cc = (int)tok->argc;
219			co = (int)(tok->wptr - tok->wstart);
220		}
221		switch (*ptr) {
222		case '\'':
223			tok->flags |= TOK_KEEP;
224			tok->flags &= ~TOK_EAT;
225			switch (tok->quote) {
226			case Q_none:
227				tok->quote = Q_single;	/* Enter single quote
228							 * mode */
229				break;
230
231			case Q_single:	/* Exit single quote mode */
232				tok->quote = Q_none;
233				break;
234
235			case Q_one:	/* Quote this ' */
236				tok->quote = Q_none;
237				*tok->wptr++ = *ptr;
238				break;
239
240			case Q_double:	/* Stay in double quote mode */
241				*tok->wptr++ = *ptr;
242				break;
243
244			case Q_doubleone:	/* Quote this ' */
245				tok->quote = Q_double;
246				*tok->wptr++ = *ptr;
247				break;
248
249			default:
250				return -1;
251			}
252			break;
253
254		case '"':
255			tok->flags &= ~TOK_EAT;
256			tok->flags |= TOK_KEEP;
257			switch (tok->quote) {
258			case Q_none:	/* Enter double quote mode */
259				tok->quote = Q_double;
260				break;
261
262			case Q_double:	/* Exit double quote mode */
263				tok->quote = Q_none;
264				break;
265
266			case Q_one:	/* Quote this " */
267				tok->quote = Q_none;
268				*tok->wptr++ = *ptr;
269				break;
270
271			case Q_single:	/* Stay in single quote mode */
272				*tok->wptr++ = *ptr;
273				break;
274
275			case Q_doubleone:	/* Quote this " */
276				tok->quote = Q_double;
277				*tok->wptr++ = *ptr;
278				break;
279
280			default:
281				return -1;
282			}
283			break;
284
285		case '\\':
286			tok->flags |= TOK_KEEP;
287			tok->flags &= ~TOK_EAT;
288			switch (tok->quote) {
289			case Q_none:	/* Quote next character */
290				tok->quote = Q_one;
291				break;
292
293			case Q_double:	/* Quote next character */
294				tok->quote = Q_doubleone;
295				break;
296
297			case Q_one:	/* Quote this, restore state */
298				*tok->wptr++ = *ptr;
299				tok->quote = Q_none;
300				break;
301
302			case Q_single:	/* Stay in single quote mode */
303				*tok->wptr++ = *ptr;
304				break;
305
306			case Q_doubleone:	/* Quote this \ */
307				tok->quote = Q_double;
308				*tok->wptr++ = *ptr;
309				break;
310
311			default:
312				return -1;
313			}
314			break;
315
316		case '\n':
317			tok->flags &= ~TOK_EAT;
318			switch (tok->quote) {
319			case Q_none:
320				goto tok_line_outok;
321
322			case Q_single:
323			case Q_double:
324				*tok->wptr++ = *ptr;	/* Add the return */
325				break;
326
327			case Q_doubleone:   /* Back to double, eat the '\n' */
328				tok->flags |= TOK_EAT;
329				tok->quote = Q_double;
330				break;
331
332			case Q_one:	/* No quote, more eat the '\n' */
333				tok->flags |= TOK_EAT;
334				tok->quote = Q_none;
335				break;
336
337			default:
338				return 0;
339			}
340			break;
341
342		case '\0':
343			switch (tok->quote) {
344			case Q_none:
345				/* Finish word and return */
346				if (tok->flags & TOK_EAT) {
347					tok->flags &= ~TOK_EAT;
348					return 3;
349				}
350				goto tok_line_outok;
351
352			case Q_single:
353				return 1;
354
355			case Q_double:
356				return 2;
357
358			case Q_doubleone:
359				tok->quote = Q_double;
360				*tok->wptr++ = *ptr;
361				break;
362
363			case Q_one:
364				tok->quote = Q_none;
365				*tok->wptr++ = *ptr;
366				break;
367
368			default:
369				return -1;
370			}
371			break;
372
373		default:
374			tok->flags &= ~TOK_EAT;
375			switch (tok->quote) {
376			case Q_none:
377				if (Strchr(tok->ifs, *ptr) != NULL)
378					FUN(tok,finish)(tok);
379				else
380					*tok->wptr++ = *ptr;
381				break;
382
383			case Q_single:
384			case Q_double:
385				*tok->wptr++ = *ptr;
386				break;
387
388
389			case Q_doubleone:
390				*tok->wptr++ = '\\';
391				tok->quote = Q_double;
392				*tok->wptr++ = *ptr;
393				break;
394
395			case Q_one:
396				tok->quote = Q_none;
397				*tok->wptr++ = *ptr;
398				break;
399
400			default:
401				return -1;
402
403			}
404			break;
405		}
406
407		if (tok->wptr >= tok->wmax - 4) {
408			size_t size = (size_t)(tok->wmax - tok->wspace + WINCR);
409			Char *s = tok_realloc(tok->wspace,
410			    size * sizeof(*s));
411			if (s == NULL)
412				return -1;
413
414			if (s != tok->wspace) {
415				size_t i;
416				for (i = 0; i < tok->argc; i++) {
417				    tok->argv[i] =
418					(tok->argv[i] - tok->wspace) + s;
419				}
420				tok->wptr = (tok->wptr - tok->wspace) + s;
421				tok->wstart = (tok->wstart - tok->wspace) + s;
422				tok->wspace = s;
423			}
424			tok->wmax = s + size;
425		}
426		if (tok->argc >= tok->amax - 4) {
427			Char **p;
428			tok->amax += AINCR;
429			p = tok_realloc(tok->argv, tok->amax * sizeof(*p));
430			if (p == NULL) {
431				tok->amax -= AINCR;
432				return -1;
433			}
434			tok->argv = p;
435		}
436	}
437 tok_line_outok:
438	if (cc == -1 && co == -1) {
439		cc = (int)tok->argc;
440		co = (int)(tok->wptr - tok->wstart);
441	}
442	if (cursorc != NULL)
443		*cursorc = cc;
444	if (cursoro != NULL)
445		*cursoro = co;
446	FUN(tok,finish)(tok);
447	*argv = (const Char **)tok->argv;
448	*argc = (int)tok->argc;
449	return 0;
450}
451
452/* FUN(tok,str)():
453 *	Simpler version of tok_line, taking a NUL terminated line
454 *	and splitting into words, ignoring cursor state.
455 */
456int
457FUN(tok,str)(TYPE(Tokenizer) *tok, const Char *line, int *argc,
458    const Char ***argv)
459{
460	TYPE(LineInfo) li;
461
462	memset(&li, 0, sizeof(li));
463	li.buffer = line;
464	li.cursor = li.lastchar = Strchr(line, '\0');
465	return FUN(tok,line)(tok, &li, argc, argv, NULL, NULL);
466}
467