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634bd210 RP |
1 | #include "fio.h" |
2 | #include "strntol.h" | |
3 | #include "pattern.h" | |
4 | ||
5 | /** | |
6 | * parse_string() - parses string in double quotes, like "abc" | |
7 | * @beg - string input | |
8 | * @out - output buffer where parsed number should be put | |
9 | * @out_len - length of the output buffer | |
10 | * @filled - pointer where number of bytes successfully | |
11 | * parsed will be put | |
12 | * | |
13 | * Returns the end pointer where parsing has been stopped. | |
14 | * In case of parsing error or lack of bytes in output buffer | |
15 | * NULL will be returned. | |
16 | */ | |
17 | static const char *parse_string(const char *beg, char *out, | |
18 | unsigned int out_len, | |
19 | unsigned int *filled) | |
20 | { | |
21 | const char *end; | |
22 | ||
23 | if (!out_len) | |
24 | return NULL; | |
25 | ||
26 | assert(*beg == '"'); | |
27 | beg++; | |
28 | end = strchr(beg, '"'); | |
29 | if (!end) | |
30 | return NULL; | |
31 | if (end - beg > out_len) | |
32 | return NULL; | |
33 | ||
34 | memcpy(out, beg, end - beg); | |
35 | *filled = end - beg; | |
36 | ||
37 | /* Catch up quote */ | |
38 | return end + 1; | |
39 | } | |
40 | ||
41 | /** | |
42 | * parse_number() - parses numbers | |
43 | * @beg - string input | |
44 | * @out - output buffer where parsed number should be put | |
45 | * @out_len - length of the output buffer | |
46 | * @filled - pointer where number of bytes successfully | |
47 | * parsed will be put | |
48 | * | |
49 | * Supports decimals in the range [INT_MIN, INT_MAX] and | |
50 | * hexidecimals of any size, which should be started with | |
51 | * prefix 0x or 0X. | |
52 | * | |
53 | * Returns the end pointer where parsing has been stopped. | |
54 | * In case of parsing error or lack of bytes in output buffer | |
55 | * NULL will be returned. | |
56 | */ | |
57 | static const char *parse_number(const char *beg, char *out, | |
58 | unsigned int out_len, | |
59 | unsigned int *filled) | |
60 | { | |
61 | const char *end; | |
62 | unsigned int val; | |
63 | long lval; | |
64 | int num, i; | |
65 | ||
66 | if (!out_len) | |
67 | return NULL; | |
68 | ||
69 | num = 0; | |
70 | sscanf(beg, "0%*[xX]%*[0-9a-fA-F]%n", &num); | |
71 | if (num == 0) { | |
72 | /* Here we are trying to parse decimal */ | |
73 | ||
74 | char *_end; | |
75 | ||
76 | /* Looking ahead */ | |
77 | _end = strcasestr(beg, "0x"); | |
78 | if (_end) | |
79 | num = _end - beg; | |
80 | if (num) | |
81 | lval = strntol(beg, num, &_end, 10); | |
82 | else | |
83 | lval = strtol(beg, &_end, 10); | |
84 | if (beg == _end || lval > INT_MAX || lval < INT_MIN) | |
85 | return NULL; | |
86 | end = _end; | |
87 | i = 0; | |
88 | if (!lval) { | |
89 | num = 0; | |
90 | out[i] = 0x00; | |
91 | i = 1; | |
92 | } else { | |
93 | val = (unsigned int)lval; | |
94 | for (; val && out_len; out_len--, i++, val >>= 8) | |
95 | out[i] = val & 0xff; | |
96 | if (val) | |
97 | return NULL; | |
98 | } | |
99 | } else { | |
100 | assert(num > 2); | |
101 | ||
102 | /* Catch up 0x prefix */ | |
103 | num -= 2; | |
104 | beg += 2; | |
105 | ||
106 | /* Look back, handle this combined string: 0xff0x14 */ | |
107 | if (beg[num] && !strncasecmp(&beg[num - 1], "0x", 2)) | |
108 | num--; | |
109 | ||
110 | end = beg + num; | |
111 | ||
112 | for (i = 0; num && out_len; | |
113 | out_len--, i++, num -= 2, beg += 2) { | |
114 | const char *fmt; | |
115 | ||
116 | fmt = (num & 1 ? "%1hhx" : "%2hhx"); | |
117 | sscanf(beg, fmt, &out[i]); | |
118 | if (num & 1) { | |
119 | num++; | |
120 | beg--; | |
121 | } | |
122 | } | |
123 | if (num) | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | *filled = i; | |
128 | return end; | |
129 | ||
130 | } | |
131 | ||
132 | /** | |
133 | * parse_format() - parses formats, like %o, etc | |
134 | * @in - string input | |
135 | * @out - output buffer where space for format should be reserved | |
136 | * @parsed - number of bytes which were already parsed so far | |
137 | * @out_len - length of the output buffer | |
138 | * @fmt_desc - format descritor array, what we expect to find | |
139 | * @fmt_desc_sz - size of the format descritor array | |
140 | * @fmt - format array, the output | |
141 | * @fmt_sz - size of format array | |
142 | * | |
143 | * This function tries to find formats, e.g.: | |
144 | * %o - offset of the block | |
145 | * | |
146 | * In case of successfull parsing it fills the format param | |
147 | * with proper offset and the size of the expected value, which | |
148 | * should be pasted into buffer using the format 'func' callback. | |
149 | * | |
150 | * Returns the end pointer where parsing has been stopped. | |
151 | * In case of parsing error or lack of bytes in output buffer | |
152 | * NULL will be returned. | |
153 | */ | |
154 | static const char *parse_format(const char *in, char *out, unsigned int parsed, | |
155 | unsigned int out_len, unsigned int *filled, | |
156 | const struct pattern_fmt_desc *fmt_desc, | |
157 | unsigned int fmt_desc_sz, | |
158 | struct pattern_fmt *fmt, unsigned int fmt_sz) | |
159 | { | |
160 | int i; | |
161 | struct pattern_fmt *f = NULL; | |
162 | unsigned int len = 0; | |
163 | ||
164 | if (!out_len || !fmt_desc || !fmt_desc_sz || !fmt || !fmt_sz) | |
165 | return NULL; | |
166 | ||
167 | assert(*in == '%'); | |
168 | ||
169 | for (i = 0; i < fmt_desc_sz; i++) { | |
170 | const struct pattern_fmt_desc *desc; | |
171 | ||
172 | desc = &fmt_desc[i]; | |
173 | len = strlen(desc->fmt); | |
174 | if (0 == strncmp(in, desc->fmt, len)) { | |
175 | fmt->desc = desc; | |
176 | fmt->off = parsed; | |
177 | f = fmt; | |
178 | break; | |
179 | } | |
180 | } | |
181 | ||
182 | if (!f) | |
183 | return NULL; | |
184 | if (f->desc->len > out_len) | |
185 | return NULL; | |
186 | ||
187 | memset(out, '\0', f->desc->len); | |
188 | *filled = f->desc->len; | |
189 | ||
190 | return in + len; | |
191 | } | |
192 | ||
193 | /** | |
194 | * parse_and_fill_pattern() - Parses combined input, which consists of strings, | |
195 | * numbers and pattern formats. | |
196 | * @in - string input | |
197 | * @in_len - size of the input string | |
198 | * @out - output buffer where parsed result will be put | |
199 | * @out_len - lengths of the output buffer | |
200 | * @fmt_desc - array of pattern format descriptors [input] | |
201 | * @fmt_desc_sz - size of the format descriptor array | |
202 | * @fmt - array of pattern formats [output] | |
203 | * @fmt_sz - pointer where the size of pattern formats array stored [input], | |
204 | * after successfull parsing this pointer will contain the number | |
205 | * of parsed formats if any [output]. | |
206 | * | |
207 | * strings: | |
208 | * bytes sequence in double quotes, e.g. "123". | |
209 | * NOTE: there is no way to escape quote, so "123\"abc" does not work. | |
210 | * | |
211 | * numbers: | |
212 | * hexidecimal - sequence of hex bytes starting from 0x or 0X prefix, | |
213 | * e.g. 0xff12ceff1100ff | |
214 | * decimal - decimal number in range [INT_MIN, INT_MAX] | |
215 | * | |
216 | * formats: | |
217 | * %o - offset of block, reserved 8 bytes. | |
218 | * | |
219 | * Explicit examples of combined string: | |
220 | * #1 #2 #3 #4 | |
221 | * in="abcd" in=-1024 in=66 in=0xFF0X1 | |
222 | * out=61 62 63 64 out=00 fc ff ff out=42 out=ff 01 | |
223 | * | |
224 | * #5 #6 | |
225 | * in=%o in="123"0xFFeeCC | |
226 | * out=00 00 00 00 00 00 00 00 out=31 32 33 ff ec cc | |
227 | * | |
228 | * #7 | |
229 | * in=-100xab"1"%o"2" | |
230 | * out=f6 ff ff ff ab 31 00 00 00 00 00 00 00 00 32 | |
231 | * | |
232 | * #9 | |
233 | * in=%o0xdeadbeef%o | |
234 | * out=00 00 00 00 00 00 00 00 de ad be ef 00 00 00 00 00 00 00 00 | |
235 | * | |
236 | * #10 | |
237 | * in=0xfefefefefefefefefefefefefefefefefefefefefe | |
238 | * out=fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe | |
239 | * | |
240 | * Returns number of bytes filled or err < 0 in case of failure. | |
241 | */ | |
242 | int parse_and_fill_pattern(const char *in, unsigned int in_len, | |
243 | char *out, unsigned int out_len, | |
244 | const struct pattern_fmt_desc *fmt_desc, | |
245 | unsigned int fmt_desc_sz, | |
246 | struct pattern_fmt *fmt, | |
247 | unsigned int *fmt_sz_out) | |
248 | { | |
249 | const char *beg, *end, *out_beg = out; | |
250 | unsigned int total = 0, fmt_rem = 0; | |
251 | ||
252 | if (!in || !in_len || !out || !out_len) | |
253 | return -EINVAL; | |
254 | if (fmt_sz_out) | |
255 | fmt_rem = *fmt_sz_out; | |
256 | ||
257 | beg = in; | |
258 | do { | |
259 | unsigned int filled; | |
260 | int parsed_fmt; | |
261 | ||
262 | filled = 0; | |
263 | parsed_fmt = 0; | |
264 | ||
265 | switch (*beg) { | |
266 | case '"': | |
267 | end = parse_string(beg, out, out_len, &filled); | |
268 | break; | |
269 | case '%': | |
270 | end = parse_format(beg, out, out - out_beg, out_len, | |
271 | &filled, fmt_desc, fmt_desc_sz, | |
272 | fmt, fmt_rem); | |
273 | parsed_fmt = 1; | |
274 | break; | |
275 | default: | |
276 | end = parse_number(beg, out, out_len, &filled); | |
277 | break; | |
278 | } | |
279 | ||
280 | if (!end) | |
281 | return -EINVAL; | |
282 | ||
283 | if (parsed_fmt) { | |
284 | assert(fmt_rem); | |
285 | fmt_rem--; | |
286 | fmt++; | |
287 | } | |
288 | ||
289 | assert(end - beg <= in_len); | |
290 | in_len -= end - beg; | |
291 | beg = end; | |
292 | ||
293 | assert(filled); | |
294 | assert(filled <= out_len); | |
295 | out_len -= filled; | |
296 | out += filled; | |
297 | total += filled; | |
298 | ||
299 | } while (in_len); | |
300 | ||
301 | if (fmt_sz_out) | |
302 | *fmt_sz_out -= fmt_rem; | |
303 | return total; | |
304 | } | |
305 | ||
306 | /** | |
307 | * dup_pattern() - Duplicates part of the pattern all over the buffer. | |
308 | * | |
309 | * Returns 0 in case of success or errno < 0 in case of failure. | |
310 | */ | |
311 | static int dup_pattern(char *out, unsigned int out_len, unsigned int pattern_len) | |
312 | { | |
313 | unsigned int left, len, off; | |
314 | ||
315 | if (out_len <= pattern_len) | |
316 | /* Normal case */ | |
317 | return 0; | |
318 | ||
319 | off = pattern_len; | |
320 | left = (out_len - off); | |
321 | len = min(left, off); | |
322 | ||
323 | /* Duplicate leftover */ | |
324 | while (left) { | |
325 | memcpy(out + off, out, len); | |
326 | left -= len; | |
327 | off <<= 1; | |
328 | len = min(left, off); | |
329 | } | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | /** | |
335 | * cpy_pattern() - Copies pattern to the buffer. | |
336 | * | |
337 | * Function copies pattern along the whole buffer. | |
338 | * | |
339 | * Returns 0 in case of success or errno < 0 in case of failure. | |
340 | */ | |
341 | int cpy_pattern(const char *pattern, unsigned int pattern_len, | |
342 | char *out, unsigned int out_len) | |
343 | { | |
344 | unsigned int len; | |
345 | ||
346 | if (!pattern || !pattern_len || !out || !out_len) | |
347 | return -EINVAL; | |
348 | ||
349 | /* Copy pattern */ | |
350 | len = min(pattern_len, out_len); | |
351 | memcpy(out, pattern, len); | |
352 | ||
353 | /* Spread filled chunk all over the buffer */ | |
354 | return dup_pattern(out, out_len, pattern_len); | |
355 | } | |
356 | ||
357 | /** | |
358 | * cmp_pattern() - Compares pattern and buffer. | |
359 | * | |
360 | * For the sake of performance this function avoids any loops. | |
361 | * Firstly it tries to compare the buffer itself, checking that | |
362 | * buffer consists of repeating patterns along the buffer size. | |
363 | * | |
364 | * If the difference is not found then the function tries to compare | |
365 | * buffer and pattern. | |
366 | * | |
367 | * Returns 0 in case of success or errno < 0 in case of failure. | |
368 | */ | |
369 | int cmp_pattern(const char *pattern, unsigned int pattern_size, | |
370 | unsigned int off, const char *buf, unsigned int len) | |
371 | { | |
372 | int rc; | |
373 | unsigned int size; | |
374 | ||
375 | /* Find the difference in buffer */ | |
376 | if (len > pattern_size) { | |
377 | rc = memcmp(buf, buf + pattern_size, len - pattern_size); | |
378 | if (rc) | |
379 | return -EILSEQ; | |
380 | } | |
381 | /* Compare second part of the pattern with buffer */ | |
382 | if (off) { | |
383 | size = min(len, pattern_size - off); | |
384 | rc = memcmp(buf, pattern + off, size); | |
385 | if (rc) | |
386 | return -EILSEQ; | |
387 | buf += size; | |
388 | len -= size; | |
389 | } | |
390 | /* Compare first part of the pattern or the whole pattern | |
391 | * with buffer */ | |
392 | if (len) { | |
393 | size = min(len, (off ? off : pattern_size)); | |
394 | rc = memcmp(buf, pattern, size); | |
395 | if (rc) | |
396 | return -EILSEQ; | |
397 | } | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | /** | |
403 | * paste_format_inplace() - Pastes parsed formats to the pattern. | |
404 | * | |
405 | * This function pastes formats to the pattern. If @fmt_sz is 0 | |
406 | * function does nothing and pattern buffer is left untouched. | |
407 | * | |
408 | * Returns 0 in case of success or errno < 0 in case of failure. | |
409 | */ | |
410 | int paste_format_inplace(char *pattern, unsigned int pattern_len, | |
411 | struct pattern_fmt *fmt, unsigned int fmt_sz, | |
412 | void *priv) | |
413 | { | |
414 | int i, rc; | |
415 | unsigned int len; | |
416 | ||
417 | if (!pattern || !pattern_len || !fmt) | |
418 | return -EINVAL; | |
419 | ||
420 | /* Paste formats for first pattern chunk */ | |
421 | for (i = 0; i < fmt_sz; i++) { | |
422 | struct pattern_fmt *f; | |
423 | ||
424 | f = &fmt[i]; | |
425 | if (pattern_len <= f->off) | |
426 | break; | |
427 | len = min(pattern_len - f->off, f->desc->len); | |
428 | rc = f->desc->paste(pattern + f->off, len, priv); | |
429 | if (rc) | |
430 | return rc; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | /** | |
437 | * paste_format() - Pastes parsed formats to the buffer. | |
438 | * | |
439 | * This function copies pattern to the buffer, pastes format | |
440 | * into it and then duplicates pattern all over the buffer size. | |
441 | * | |
442 | * Returns 0 in case of success or errno < 0 in case of failure. | |
443 | */ | |
444 | int paste_format(const char *pattern, unsigned int pattern_len, | |
445 | struct pattern_fmt *fmt, unsigned int fmt_sz, | |
446 | char *out, unsigned int out_len, void *priv) | |
447 | { | |
448 | int rc; | |
449 | unsigned int len; | |
450 | ||
451 | if (!pattern || !pattern_len || !out || !out_len) | |
452 | return -EINVAL; | |
453 | ||
454 | /* Copy pattern */ | |
455 | len = min(pattern_len, out_len); | |
456 | memcpy(out, pattern, len); | |
457 | ||
458 | rc = paste_format_inplace(out, len, fmt, fmt_sz, priv); | |
459 | if (rc) | |
460 | return rc; | |
461 | ||
462 | /* Spread filled chunk all over the buffer */ | |
463 | return dup_pattern(out, out_len, pattern_len); | |
464 | } |