summaryrefslogtreecommitdiff
path: root/libcurl/src/lib/curl_fnmatch.c
blob: d762e254ddcfb0ce53408c4dea88d67ce61e5fab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

#include "curl_setup.h"

#include "curl_fnmatch.h"
#include "curl_memory.h"

/* The last #include file should be: */
#include "memdebug.h"

#define CURLFNM_CHARSET_LEN (sizeof(char) * 256)
#define CURLFNM_CHSET_SIZE (CURLFNM_CHARSET_LEN + 15)

#define CURLFNM_NEGATE  CURLFNM_CHARSET_LEN

#define CURLFNM_ALNUM   (CURLFNM_CHARSET_LEN + 1)
#define CURLFNM_DIGIT   (CURLFNM_CHARSET_LEN + 2)
#define CURLFNM_XDIGIT  (CURLFNM_CHARSET_LEN + 3)
#define CURLFNM_ALPHA   (CURLFNM_CHARSET_LEN + 4)
#define CURLFNM_PRINT   (CURLFNM_CHARSET_LEN + 5)
#define CURLFNM_BLANK   (CURLFNM_CHARSET_LEN + 6)
#define CURLFNM_LOWER   (CURLFNM_CHARSET_LEN + 7)
#define CURLFNM_GRAPH   (CURLFNM_CHARSET_LEN + 8)
#define CURLFNM_SPACE   (CURLFNM_CHARSET_LEN + 9)
#define CURLFNM_UPPER   (CURLFNM_CHARSET_LEN + 10)

typedef enum {
  CURLFNM_LOOP_DEFAULT = 0,
  CURLFNM_LOOP_BACKSLASH
} loop_state;

typedef enum {
  CURLFNM_SCHS_DEFAULT = 0,
  CURLFNM_SCHS_MAYRANGE,
  CURLFNM_SCHS_MAYRANGE2,
  CURLFNM_SCHS_RIGHTBR,
  CURLFNM_SCHS_RIGHTBRLEFTBR
} setcharset_state;

typedef enum {
  CURLFNM_PKW_INIT = 0,
  CURLFNM_PKW_DDOT
} parsekey_state;

#define SETCHARSET_OK     1
#define SETCHARSET_FAIL   0

static int parsekeyword(unsigned char **pattern, unsigned char *charset)
{
  parsekey_state state = CURLFNM_PKW_INIT;
#define KEYLEN 10
  char keyword[KEYLEN] = { 0 };
  int found = FALSE;
  int i;
  unsigned char *p = *pattern;
  for(i = 0; !found; i++) {
    char c = *p++;
    if(i >= KEYLEN)
      return SETCHARSET_FAIL;
    switch(state) {
    case CURLFNM_PKW_INIT:
      if(ISALPHA(c) && ISLOWER(c))
        keyword[i] = c;
      else if(c == ':')
        state = CURLFNM_PKW_DDOT;
      else
        return 0;
      break;
    case CURLFNM_PKW_DDOT:
      if(c == ']')
        found = TRUE;
      else
        return SETCHARSET_FAIL;
    }
  }
#undef KEYLEN

  *pattern = p; /* move caller's pattern pointer */
  if(strcmp(keyword, "digit") == 0)
    charset[CURLFNM_DIGIT] = 1;
  else if(strcmp(keyword, "alnum") == 0)
    charset[CURLFNM_ALNUM] = 1;
  else if(strcmp(keyword, "alpha") == 0)
    charset[CURLFNM_ALPHA] = 1;
  else if(strcmp(keyword, "xdigit") == 0)
    charset[CURLFNM_XDIGIT] = 1;
  else if(strcmp(keyword, "print") == 0)
    charset[CURLFNM_PRINT] = 1;
  else if(strcmp(keyword, "graph") == 0)
    charset[CURLFNM_GRAPH] = 1;
  else if(strcmp(keyword, "space") == 0)
    charset[CURLFNM_SPACE] = 1;
  else if(strcmp(keyword, "blank") == 0)
    charset[CURLFNM_BLANK] = 1;
  else if(strcmp(keyword, "upper") == 0)
    charset[CURLFNM_UPPER] = 1;
  else if(strcmp(keyword, "lower") == 0)
    charset[CURLFNM_LOWER] = 1;
  else
    return SETCHARSET_FAIL;
  return SETCHARSET_OK;
}

/* returns 1 (true) if pattern is OK, 0 if is bad ("p" is pattern pointer) */
static int setcharset(unsigned char **p, unsigned char *charset)
{
  setcharset_state state = CURLFNM_SCHS_DEFAULT;
  unsigned char rangestart = 0;
  unsigned char lastchar   = 0;
  bool something_found = FALSE;
  unsigned char c;
  for(;;) {
    c = **p;
    switch(state) {
    case CURLFNM_SCHS_DEFAULT:
      if(ISALNUM(c)) { /* ASCII value */
        rangestart = c;
        charset[c] = 1;
        (*p)++;
        state = CURLFNM_SCHS_MAYRANGE;
        something_found = TRUE;
      }
      else if(c == ']') {
        if(something_found)
          return SETCHARSET_OK;
        else
          something_found = TRUE;
        state = CURLFNM_SCHS_RIGHTBR;
        charset[c] = 1;
        (*p)++;
      }
      else if(c == '[') {
        char c2 = *((*p)+1);
        if(c2 == ':') { /* there has to be a keyword */
          (*p) += 2;
          if(parsekeyword(p, charset)) {
            state = CURLFNM_SCHS_DEFAULT;
          }
          else
            return SETCHARSET_FAIL;
        }
        else {
          charset[c] = 1;
          (*p)++;
        }
        something_found = TRUE;
      }
      else if(c == '?' || c == '*') {
        something_found = TRUE;
        charset[c] = 1;
        (*p)++;
      }
      else if(c == '^' || c == '!') {
        if(!something_found) {
          if(charset[CURLFNM_NEGATE]) {
            charset[c] = 1;
            something_found = TRUE;
          }
          else
            charset[CURLFNM_NEGATE] = 1; /* negate charset */
        }
        else
          charset[c] = 1;
        (*p)++;
      }
      else if(c == '\\') {
        c = *(++(*p));
        if(ISPRINT((c))) {
          something_found = TRUE;
          state = CURLFNM_SCHS_MAYRANGE;
          charset[c] = 1;
          rangestart = c;
          (*p)++;
        }
        else
          return SETCHARSET_FAIL;
      }
      else if(c == '\0') {
        return SETCHARSET_FAIL;
      }
      else {
        charset[c] = 1;
        (*p)++;
        something_found = TRUE;
      }
      break;
    case CURLFNM_SCHS_MAYRANGE:
      if(c == '-') {
        charset[c] = 1;
        (*p)++;
        lastchar = '-';
        state = CURLFNM_SCHS_MAYRANGE2;
      }
      else if(c == '[') {
        state = CURLFNM_SCHS_DEFAULT;
      }
      else if(ISALNUM(c)) {
        charset[c] = 1;
        (*p)++;
      }
      else if(c == '\\') {
        c = *(++(*p));
        if(ISPRINT(c)) {
          charset[c] = 1;
          (*p)++;
        }
        else
          return SETCHARSET_FAIL;
      }
      else if(c == ']') {
        return SETCHARSET_OK;
      }
      else
        return SETCHARSET_FAIL;
      break;
    case CURLFNM_SCHS_MAYRANGE2:
      if(c == '\\') {
        c = *(++(*p));
        if(!ISPRINT(c))
          return SETCHARSET_FAIL;
      }
      if(c == ']') {
        return SETCHARSET_OK;
      }
      else if(c == '\\') {
        c = *(++(*p));
        if(ISPRINT(c)) {
          charset[c] = 1;
          state = CURLFNM_SCHS_DEFAULT;
          (*p)++;
        }
        else
          return SETCHARSET_FAIL;
      }
      if(c >= rangestart) {
        if((ISLOWER(c) && ISLOWER(rangestart)) ||
           (ISDIGIT(c) && ISDIGIT(rangestart)) ||
           (ISUPPER(c) && ISUPPER(rangestart))) {
          charset[lastchar] = 0;
          rangestart++;
          while(rangestart++ <= c)
            charset[rangestart-1] = 1;
          (*p)++;
          state = CURLFNM_SCHS_DEFAULT;
        }
        else
          return SETCHARSET_FAIL;
      }
      break;
    case CURLFNM_SCHS_RIGHTBR:
      if(c == '[') {
        state = CURLFNM_SCHS_RIGHTBRLEFTBR;
        charset[c] = 1;
        (*p)++;
      }
      else if(c == ']') {
        return SETCHARSET_OK;
      }
      else if(c == '\0') {
        return SETCHARSET_FAIL;
      }
      else if(ISPRINT(c)) {
        charset[c] = 1;
        (*p)++;
        state = CURLFNM_SCHS_DEFAULT;
      }
      else
        /* used 'goto fail' instead of 'return SETCHARSET_FAIL' to avoid a
         * nonsense warning 'statement not reached' at end of the fnc when
         * compiling on Solaris */
        goto fail;
      break;
    case CURLFNM_SCHS_RIGHTBRLEFTBR:
      if(c == ']') {
        return SETCHARSET_OK;
      }
      else {
        state  = CURLFNM_SCHS_DEFAULT;
        charset[c] = 1;
        (*p)++;
      }
      break;
    }
  }
fail:
  return SETCHARSET_FAIL;
}

static int loop(const unsigned char *pattern, const unsigned char *string)
{
  loop_state state = CURLFNM_LOOP_DEFAULT;
  unsigned char *p = (unsigned char *)pattern;
  unsigned char *s = (unsigned char *)string;
  unsigned char charset[CURLFNM_CHSET_SIZE] = { 0 };
  int rc = 0;

  for(;;) {
    switch(state) {
    case CURLFNM_LOOP_DEFAULT:
      if(*p == '*') {
        while(*(p+1) == '*') /* eliminate multiple stars */
          p++;
        if(*s == '\0' && *(p+1) == '\0')
          return CURL_FNMATCH_MATCH;
        rc = loop(p + 1, s); /* *.txt matches .txt <=> .txt matches .txt */
        if(rc == CURL_FNMATCH_MATCH)
          return CURL_FNMATCH_MATCH;
        if(*s) /* let the star eat up one character */
          s++;
        else
          return CURL_FNMATCH_NOMATCH;
      }
      else if(*p == '?') {
        if(ISPRINT(*s)) {
          s++;
          p++;
        }
        else if(*s == '\0')
          return CURL_FNMATCH_NOMATCH;
        else
          return CURL_FNMATCH_FAIL; /* cannot deal with other character */
      }
      else if(*p == '\0') {
        if(*s == '\0')
          return CURL_FNMATCH_MATCH;
        else
          return CURL_FNMATCH_NOMATCH;
      }
      else if(*p == '\\') {
        state = CURLFNM_LOOP_BACKSLASH;
        p++;
      }
      else if(*p == '[') {
        unsigned char *pp = p+1; /* cannot handle with pointer to register */
        if(setcharset(&pp, charset)) {
          int found = FALSE;
          if(charset[(unsigned int)*s])
            found = TRUE;
          else if(charset[CURLFNM_ALNUM])
            found = ISALNUM(*s);
          else if(charset[CURLFNM_ALPHA])
            found = ISALPHA(*s);
          else if(charset[CURLFNM_DIGIT])
            found = ISDIGIT(*s);
          else if(charset[CURLFNM_XDIGIT])
            found = ISXDIGIT(*s);
          else if(charset[CURLFNM_PRINT])
            found = ISPRINT(*s);
          else if(charset[CURLFNM_SPACE])
            found = ISSPACE(*s);
          else if(charset[CURLFNM_UPPER])
            found = ISUPPER(*s);
          else if(charset[CURLFNM_LOWER])
            found = ISLOWER(*s);
          else if(charset[CURLFNM_BLANK])
            found = ISBLANK(*s);
          else if(charset[CURLFNM_GRAPH])
            found = ISGRAPH(*s);

          if(charset[CURLFNM_NEGATE])
            found = !found;

          if(found) {
            p = pp+1;
            s++;
            memset(charset, 0, CURLFNM_CHSET_SIZE);
          }
          else
            return CURL_FNMATCH_NOMATCH;
        }
        else
          return CURL_FNMATCH_FAIL;
      }
      else {
        if(*p++ != *s++)
          return CURL_FNMATCH_NOMATCH;
      }
      break;
    case CURLFNM_LOOP_BACKSLASH:
      if(ISPRINT(*p)) {
        if(*p++ == *s++)
          state = CURLFNM_LOOP_DEFAULT;
        else
          return CURL_FNMATCH_NOMATCH;
      }
      else
        return CURL_FNMATCH_FAIL;
      break;
    }
  }
}

/*
 * @unittest: 1307
 */
CURL_STATIC int Curl_fnmatch(void *ptr, const char *pattern, const char *string)
{
  (void)ptr; /* the argument is specified by the curl_fnmatch_callback
                prototype, but not used by Curl_fnmatch() */
  if(!pattern || !string) {
    return CURL_FNMATCH_FAIL;
  }
  return loop((unsigned char *)pattern, (unsigned char *)string);
}