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tokenizer.c
1 /* $NetBSD: tokenizer.c,v 1.19 2011/07/28 20:50:55 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 #endif
41 #endif /* not lint && not SCCSID */
42 
43 /* We build this file twice, once as NARROW, once as WIDE. */
44 /*
45  * tokenize.c: Bourne shell like tokenizer
46  */
47 #include <string.h>
48 #include <stdlib.h>
49 #include "histedit.h"
50 #include "chartype.h"
51 
52 typedef enum {
53  Q_none, Q_single, Q_double, Q_one, Q_doubleone
54 } quote_t;
55 
56 #define TOK_KEEP 1
57 #define TOK_EAT 2
58 
59 #define WINCR 20
60 #define AINCR 10
61 
62 #define IFS STR("\t \n")
63 
64 #define tok_malloc(a) malloc(a)
65 #define tok_free(a) free(a)
66 #define tok_realloc(a, b) realloc(a, b)
67 #define tok_strdup(a) Strdup(a)
68 
69 
70 struct TYPE(tokenizer) {
71  Char *ifs; /* In field separator */
72  int argc, amax; /* Current and maximum number of args */
73  Char **argv; /* Argument list */
74  Char *wptr, *wmax; /* Space and limit on the word buffer */
75  Char *wstart; /* Beginning of next word */
76  Char *wspace; /* Space of word buffer */
77  quote_t quote; /* Quoting state */
78  int flags; /* flags; */
79 };
80 
81 
82 private void FUN(tok,finish)(TYPE(Tokenizer) *);
83 
84 
85 /* FUN(tok,finish)():
86  * Finish a word in the tokenizer.
87  */
88 private void
89 FUN(tok,finish)(TYPE(Tokenizer) *tok)
90 {
91 
92  *tok->wptr = '\0';
93  if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) {
94  tok->argv[tok->argc++] = tok->wstart;
95  tok->argv[tok->argc] = NULL;
96  tok->wstart = ++tok->wptr;
97  }
98  tok->flags &= ~TOK_KEEP;
99 }
100 
101 
102 /* FUN(tok,init)():
103  * Initialize the tokenizer
104  */
105 public TYPE(Tokenizer) *
106 FUN(tok,init)(const Char *ifs)
107 {
108  TYPE(Tokenizer) *tok = tok_malloc(sizeof(*tok));
109 
110  if (tok == NULL)
111  return NULL;
112  tok->ifs = tok_strdup(ifs ? ifs : IFS);
113  if (tok->ifs == NULL) {
114  tok_free(tok);
115  return NULL;
116  }
117  tok->argc = 0;
118  tok->amax = AINCR;
119  tok->argv = tok_malloc(sizeof(*tok->argv) * tok->amax);
120  if (tok->argv == NULL) {
121  tok_free(tok->ifs);
122  tok_free(tok);
123  return NULL;
124  }
125  tok->argv[0] = NULL;
126  tok->wspace = tok_malloc(WINCR * sizeof(*tok->wspace));
127  if (tok->wspace == NULL) {
128  tok_free(tok->argv);
129  tok_free(tok->ifs);
130  tok_free(tok);
131  return NULL;
132  }
133  tok->wmax = tok->wspace + WINCR;
134  tok->wstart = tok->wspace;
135  tok->wptr = tok->wspace;
136  tok->flags = 0;
137  tok->quote = Q_none;
138 
139  return (tok);
140 }
141 
142 
143 /* FUN(tok,reset)():
144  * Reset the tokenizer
145  */
146 public void
147 FUN(tok,reset)(TYPE(Tokenizer) *tok)
148 {
149 
150  tok->argc = 0;
151  tok->wstart = tok->wspace;
152  tok->wptr = tok->wspace;
153  tok->flags = 0;
154  tok->quote = Q_none;
155 }
156 
157 
158 /* FUN(tok,end)():
159  * Clean up
160  */
161 public void
162 FUN(tok,end)(TYPE(Tokenizer) *tok)
163 {
164 
165  tok_free(tok->ifs);
166  tok_free(tok->wspace);
167  tok_free(tok->argv);
168  tok_free(tok);
169 }
170 
171 
172 
173 /* FUN(tok,line)():
174  * Bourne shell (sh(1)) like tokenizing
175  * Arguments:
176  * tok current tokenizer state (setup with FUN(tok,init)())
177  * line line to parse
178  * Returns:
179  * -1 Internal error
180  * 3 Quoted return
181  * 2 Unmatched double quote
182  * 1 Unmatched single quote
183  * 0 Ok
184  * Modifies (if return value is 0):
185  * argc number of arguments
186  * argv argument array
187  * cursorc if !NULL, argv element containing cursor
188  * cursorv if !NULL, offset in argv[cursorc] of cursor
189  */
190 public int
191 FUN(tok,line)(TYPE(Tokenizer) *tok, const TYPE(LineInfo) *line,
192  int *argc, const Char ***argv, int *cursorc, int *cursoro)
193 {
194  const Char *ptr;
195  int cc, co;
196 
197  cc = co = -1;
198  ptr = line->buffer;
199  for (ptr = line->buffer; ;ptr++) {
200  if (ptr >= line->lastchar)
201  ptr = STR("");
202  if (ptr == line->cursor) {
203  cc = tok->argc;
204  co = (int)(tok->wptr - tok->wstart);
205  }
206  switch (*ptr) {
207  case '\'':
208  tok->flags |= TOK_KEEP;
209  tok->flags &= ~TOK_EAT;
210  switch (tok->quote) {
211  case Q_none:
212  tok->quote = Q_single; /* Enter single quote
213  * mode */
214  break;
215 
216  case Q_single: /* Exit single quote mode */
217  tok->quote = Q_none;
218  break;
219 
220  case Q_one: /* Quote this ' */
221  tok->quote = Q_none;
222  *tok->wptr++ = *ptr;
223  break;
224 
225  case Q_double: /* Stay in double quote mode */
226  *tok->wptr++ = *ptr;
227  break;
228 
229  case Q_doubleone: /* Quote this ' */
230  tok->quote = Q_double;
231  *tok->wptr++ = *ptr;
232  break;
233 
234  default:
235  return (-1);
236  }
237  break;
238 
239  case '"':
240  tok->flags &= ~TOK_EAT;
241  tok->flags |= TOK_KEEP;
242  switch (tok->quote) {
243  case Q_none: /* Enter double quote mode */
244  tok->quote = Q_double;
245  break;
246 
247  case Q_double: /* Exit double quote mode */
248  tok->quote = Q_none;
249  break;
250 
251  case Q_one: /* Quote this " */
252  tok->quote = Q_none;
253  *tok->wptr++ = *ptr;
254  break;
255 
256  case Q_single: /* Stay in single quote mode */
257  *tok->wptr++ = *ptr;
258  break;
259 
260  case Q_doubleone: /* Quote this " */
261  tok->quote = Q_double;
262  *tok->wptr++ = *ptr;
263  break;
264 
265  default:
266  return (-1);
267  }
268  break;
269 
270  case '\\':
271  tok->flags |= TOK_KEEP;
272  tok->flags &= ~TOK_EAT;
273  switch (tok->quote) {
274  case Q_none: /* Quote next character */
275  tok->quote = Q_one;
276  break;
277 
278  case Q_double: /* Quote next character */
279  tok->quote = Q_doubleone;
280  break;
281 
282  case Q_one: /* Quote this, restore state */
283  *tok->wptr++ = *ptr;
284  tok->quote = Q_none;
285  break;
286 
287  case Q_single: /* Stay in single quote mode */
288  *tok->wptr++ = *ptr;
289  break;
290 
291  case Q_doubleone: /* Quote this \ */
292  tok->quote = Q_double;
293  *tok->wptr++ = *ptr;
294  break;
295 
296  default:
297  return (-1);
298  }
299  break;
300 
301  case '\n':
302  tok->flags &= ~TOK_EAT;
303  switch (tok->quote) {
304  case Q_none:
305  goto tok_line_outok;
306 
307  case Q_single:
308  case Q_double:
309  *tok->wptr++ = *ptr; /* Add the return */
310  break;
311 
312  case Q_doubleone: /* Back to double, eat the '\n' */
313  tok->flags |= TOK_EAT;
314  tok->quote = Q_double;
315  break;
316 
317  case Q_one: /* No quote, more eat the '\n' */
318  tok->flags |= TOK_EAT;
319  tok->quote = Q_none;
320  break;
321 
322  default:
323  return (0);
324  }
325  break;
326 
327  case '\0':
328  switch (tok->quote) {
329  case Q_none:
330  /* Finish word and return */
331  if (tok->flags & TOK_EAT) {
332  tok->flags &= ~TOK_EAT;
333  return (3);
334  }
335  goto tok_line_outok;
336 
337  case Q_single:
338  return (1);
339 
340  case Q_double:
341  return (2);
342 
343  case Q_doubleone:
344  tok->quote = Q_double;
345  *tok->wptr++ = *ptr;
346  break;
347 
348  case Q_one:
349  tok->quote = Q_none;
350  *tok->wptr++ = *ptr;
351  break;
352 
353  default:
354  return (-1);
355  }
356  break;
357 
358  default:
359  tok->flags &= ~TOK_EAT;
360  switch (tok->quote) {
361  case Q_none:
362  if (Strchr(tok->ifs, *ptr) != NULL)
363  FUN(tok,finish)(tok);
364  else
365  *tok->wptr++ = *ptr;
366  break;
367 
368  case Q_single:
369  case Q_double:
370  *tok->wptr++ = *ptr;
371  break;
372 
373 
374  case Q_doubleone:
375  *tok->wptr++ = '\\';
376  tok->quote = Q_double;
377  *tok->wptr++ = *ptr;
378  break;
379 
380  case Q_one:
381  tok->quote = Q_none;
382  *tok->wptr++ = *ptr;
383  break;
384 
385  default:
386  return (-1);
387 
388  }
389  break;
390  }
391 
392  if (tok->wptr >= tok->wmax - 4) {
393  size_t size = tok->wmax - tok->wspace + WINCR;
394  Char *s = tok_realloc(tok->wspace,
395  size * sizeof(*s));
396  if (s == NULL)
397  return (-1);
398 
399  if (s != tok->wspace) {
400  int i;
401  for (i = 0; i < tok->argc; i++) {
402  tok->argv[i] =
403  (tok->argv[i] - tok->wspace) + s;
404  }
405  tok->wptr = (tok->wptr - tok->wspace) + s;
406  tok->wstart = (tok->wstart - tok->wspace) + s;
407  tok->wspace = s;
408  }
409  tok->wmax = s + size;
410  }
411  if (tok->argc >= tok->amax - 4) {
412  Char **p;
413  tok->amax += AINCR;
414  p = tok_realloc(tok->argv, tok->amax * sizeof(*p));
415  if (p == NULL)
416  return (-1);
417  tok->argv = p;
418  }
419  }
420  tok_line_outok:
421  if (cc == -1 && co == -1) {
422  cc = tok->argc;
423  co = (int)(tok->wptr - tok->wstart);
424  }
425  if (cursorc != NULL)
426  *cursorc = cc;
427  if (cursoro != NULL)
428  *cursoro = co;
429  FUN(tok,finish)(tok);
430  *argv = (const Char **)tok->argv;
431  *argc = tok->argc;
432  return (0);
433 }
434 
435 /* FUN(tok,str)():
436  * Simpler version of tok_line, taking a NUL terminated line
437  * and splitting into words, ignoring cursor state.
438  */
439 public int
440 FUN(tok,str)(TYPE(Tokenizer) *tok, const Char *line, int *argc,
441  const Char ***argv)
442 {
443  TYPE(LineInfo) li;
444 
445  memset(&li, 0, sizeof(li));
446  li.buffer = line;
447  li.cursor = li.lastchar = Strchr(line, '\0');
448  return (FUN(tok,line)(tok, &li, argc, argv, NULL, NULL));
449 }