1 | /* |
2 | * C utilities |
3 | * |
4 | * Copyright (c) 2017 Fabrice Bellard |
5 | * Copyright (c) 2018 Charlie Gordon |
6 | * |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
8 | * of this software and associated documentation files (the "Software"), to deal |
9 | * in the Software without restriction, including without limitation the rights |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
11 | * copies of the Software, and to permit persons to whom the Software is |
12 | * furnished to do so, subject to the following conditions: |
13 | * |
14 | * The above copyright notice and this permission notice shall be included in |
15 | * all copies or substantial portions of the Software. |
16 | * |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
23 | * THE SOFTWARE. |
24 | */ |
25 | #include <stdlib.h> |
26 | #include <stdio.h> |
27 | #include <stdarg.h> |
28 | #include <string.h> |
29 | |
30 | #include "cutils.h" |
31 | |
32 | void pstrcpy(char *buf, int buf_size, const char *str) |
33 | { |
34 | int c; |
35 | char *q = buf; |
36 | |
37 | if (buf_size <= 0) |
38 | return; |
39 | |
40 | for(;;) { |
41 | c = *str++; |
42 | if (c == 0 || q >= buf + buf_size - 1) |
43 | break; |
44 | *q++ = c; |
45 | } |
46 | *q = '\0'; |
47 | } |
48 | |
49 | /* strcat and truncate. */ |
50 | char *pstrcat(char *buf, int buf_size, const char *s) |
51 | { |
52 | int len; |
53 | len = strlen(buf); |
54 | if (len < buf_size) |
55 | pstrcpy(buf + len, buf_size - len, s); |
56 | return buf; |
57 | } |
58 | |
59 | int strstart(const char *str, const char *val, const char **ptr) |
60 | { |
61 | const char *p, *q; |
62 | p = str; |
63 | q = val; |
64 | while (*q != '\0') { |
65 | if (*p != *q) |
66 | return 0; |
67 | p++; |
68 | q++; |
69 | } |
70 | if (ptr) |
71 | *ptr = p; |
72 | return 1; |
73 | } |
74 | |
75 | int has_suffix(const char *str, const char *suffix) |
76 | { |
77 | size_t len = strlen(str); |
78 | size_t slen = strlen(suffix); |
79 | return (len >= slen && !memcmp(str + len - slen, suffix, slen)); |
80 | } |
81 | |
82 | /* Dynamic buffer package */ |
83 | |
84 | static void *dbuf_default_realloc(void *opaque, void *ptr, size_t size) |
85 | { |
86 | return realloc(ptr, size); |
87 | } |
88 | |
89 | void dbuf_init2(DynBuf *s, void *opaque, DynBufReallocFunc *realloc_func) |
90 | { |
91 | memset(s, 0, sizeof(*s)); |
92 | if (!realloc_func) |
93 | realloc_func = dbuf_default_realloc; |
94 | s->opaque = opaque; |
95 | s->realloc_func = realloc_func; |
96 | } |
97 | |
98 | void dbuf_init(DynBuf *s) |
99 | { |
100 | dbuf_init2(s, NULL, NULL); |
101 | } |
102 | |
103 | /* return < 0 if error */ |
104 | int dbuf_realloc(DynBuf *s, size_t new_size) |
105 | { |
106 | size_t size; |
107 | uint8_t *new_buf; |
108 | if (new_size > s->allocated_size) { |
109 | if (s->error) |
110 | return -1; |
111 | size = s->allocated_size * 3 / 2; |
112 | if (size > new_size) |
113 | new_size = size; |
114 | new_buf = s->realloc_func(s->opaque, s->buf, new_size); |
115 | if (!new_buf) { |
116 | s->error = TRUE; |
117 | return -1; |
118 | } |
119 | s->buf = new_buf; |
120 | s->allocated_size = new_size; |
121 | } |
122 | return 0; |
123 | } |
124 | |
125 | int dbuf_write(DynBuf *s, size_t offset, const uint8_t *data, size_t len) |
126 | { |
127 | size_t end; |
128 | end = offset + len; |
129 | if (dbuf_realloc(s, end)) |
130 | return -1; |
131 | memcpy(s->buf + offset, data, len); |
132 | if (end > s->size) |
133 | s->size = end; |
134 | return 0; |
135 | } |
136 | |
137 | int dbuf_put(DynBuf *s, const uint8_t *data, size_t len) |
138 | { |
139 | if (unlikely((s->size + len) > s->allocated_size)) { |
140 | if (dbuf_realloc(s, s->size + len)) |
141 | return -1; |
142 | } |
143 | memcpy_no_ub(s->buf + s->size, data, len); |
144 | s->size += len; |
145 | return 0; |
146 | } |
147 | |
148 | int dbuf_put_self(DynBuf *s, size_t offset, size_t len) |
149 | { |
150 | if (unlikely((s->size + len) > s->allocated_size)) { |
151 | if (dbuf_realloc(s, s->size + len)) |
152 | return -1; |
153 | } |
154 | memcpy(s->buf + s->size, s->buf + offset, len); |
155 | s->size += len; |
156 | return 0; |
157 | } |
158 | |
159 | int dbuf_putc(DynBuf *s, uint8_t c) |
160 | { |
161 | return dbuf_put(s, &c, 1); |
162 | } |
163 | |
164 | int dbuf_putstr(DynBuf *s, const char *str) |
165 | { |
166 | return dbuf_put(s, (const uint8_t *)str, strlen(str)); |
167 | } |
168 | |
169 | int __attribute__((format(printf, 2, 3))) dbuf_printf(DynBuf *s, |
170 | const char *fmt, ...) |
171 | { |
172 | va_list ap; |
173 | char buf[128]; |
174 | int len; |
175 | |
176 | va_start(ap, fmt); |
177 | len = vsnprintf(buf, sizeof(buf), fmt, ap); |
178 | va_end(ap); |
179 | if (len < 0) |
180 | return -1; |
181 | if (len < sizeof(buf)) { |
182 | /* fast case */ |
183 | return dbuf_put(s, (uint8_t *)buf, len); |
184 | } else { |
185 | if (dbuf_realloc(s, s->size + len + 1)) |
186 | return -1; |
187 | va_start(ap, fmt); |
188 | vsnprintf((char *)(s->buf + s->size), s->allocated_size - s->size, |
189 | fmt, ap); |
190 | va_end(ap); |
191 | s->size += len; |
192 | } |
193 | return 0; |
194 | } |
195 | |
196 | void dbuf_free(DynBuf *s) |
197 | { |
198 | /* we test s->buf as a fail safe to avoid crashing if dbuf_free() |
199 | is called twice */ |
200 | if (s->buf) { |
201 | s->realloc_func(s->opaque, s->buf, 0); |
202 | } |
203 | memset(s, 0, sizeof(*s)); |
204 | } |
205 | |
206 | /* Note: at most 31 bits are encoded. At most UTF8_CHAR_LEN_MAX bytes |
207 | are output. */ |
208 | int unicode_to_utf8(uint8_t *buf, unsigned int c) |
209 | { |
210 | uint8_t *q = buf; |
211 | |
212 | if (c < 0x80) { |
213 | *q++ = c; |
214 | } else { |
215 | if (c < 0x800) { |
216 | *q++ = (c >> 6) | 0xc0; |
217 | } else { |
218 | if (c < 0x10000) { |
219 | *q++ = (c >> 12) | 0xe0; |
220 | } else { |
221 | if (c < 0x00200000) { |
222 | *q++ = (c >> 18) | 0xf0; |
223 | } else { |
224 | if (c < 0x04000000) { |
225 | *q++ = (c >> 24) | 0xf8; |
226 | } else if (c < 0x80000000) { |
227 | *q++ = (c >> 30) | 0xfc; |
228 | *q++ = ((c >> 24) & 0x3f) | 0x80; |
229 | } else { |
230 | return 0; |
231 | } |
232 | *q++ = ((c >> 18) & 0x3f) | 0x80; |
233 | } |
234 | *q++ = ((c >> 12) & 0x3f) | 0x80; |
235 | } |
236 | *q++ = ((c >> 6) & 0x3f) | 0x80; |
237 | } |
238 | *q++ = (c & 0x3f) | 0x80; |
239 | } |
240 | return q - buf; |
241 | } |
242 | |
243 | static const unsigned int utf8_min_code[5] = { |
244 | 0x80, 0x800, 0x10000, 0x00200000, 0x04000000, |
245 | }; |
246 | |
247 | static const unsigned char utf8_first_code_mask[5] = { |
248 | 0x1f, 0xf, 0x7, 0x3, 0x1, |
249 | }; |
250 | |
251 | /* return -1 if error. *pp is not updated in this case. max_len must |
252 | be >= 1. The maximum length for a UTF8 byte sequence is 6 bytes. */ |
253 | int unicode_from_utf8(const uint8_t *p, int max_len, const uint8_t **pp) |
254 | { |
255 | int l, c, b, i; |
256 | |
257 | c = *p++; |
258 | if (c < 0x80) { |
259 | *pp = p; |
260 | return c; |
261 | } |
262 | switch(c) { |
263 | case 0xc0: case 0xc1: case 0xc2: case 0xc3: |
264 | case 0xc4: case 0xc5: case 0xc6: case 0xc7: |
265 | case 0xc8: case 0xc9: case 0xca: case 0xcb: |
266 | case 0xcc: case 0xcd: case 0xce: case 0xcf: |
267 | case 0xd0: case 0xd1: case 0xd2: case 0xd3: |
268 | case 0xd4: case 0xd5: case 0xd6: case 0xd7: |
269 | case 0xd8: case 0xd9: case 0xda: case 0xdb: |
270 | case 0xdc: case 0xdd: case 0xde: case 0xdf: |
271 | l = 1; |
272 | break; |
273 | case 0xe0: case 0xe1: case 0xe2: case 0xe3: |
274 | case 0xe4: case 0xe5: case 0xe6: case 0xe7: |
275 | case 0xe8: case 0xe9: case 0xea: case 0xeb: |
276 | case 0xec: case 0xed: case 0xee: case 0xef: |
277 | l = 2; |
278 | break; |
279 | case 0xf0: case 0xf1: case 0xf2: case 0xf3: |
280 | case 0xf4: case 0xf5: case 0xf6: case 0xf7: |
281 | l = 3; |
282 | break; |
283 | case 0xf8: case 0xf9: case 0xfa: case 0xfb: |
284 | l = 4; |
285 | break; |
286 | case 0xfc: case 0xfd: |
287 | l = 5; |
288 | break; |
289 | default: |
290 | return -1; |
291 | } |
292 | /* check that we have enough characters */ |
293 | if (l > (max_len - 1)) |
294 | return -1; |
295 | c &= utf8_first_code_mask[l - 1]; |
296 | for(i = 0; i < l; i++) { |
297 | b = *p++; |
298 | if (b < 0x80 || b >= 0xc0) |
299 | return -1; |
300 | c = (c << 6) | (b & 0x3f); |
301 | } |
302 | if (c < utf8_min_code[l - 1]) |
303 | return -1; |
304 | *pp = p; |
305 | return c; |
306 | } |
307 | |
308 | #if 0 |
309 | |
310 | #if defined(EMSCRIPTEN) || defined(__ANDROID__) |
311 | |
312 | static void *rqsort_arg; |
313 | static int (*rqsort_cmp)(const void *, const void *, void *); |
314 | |
315 | static int rqsort_cmp2(const void *p1, const void *p2) |
316 | { |
317 | return rqsort_cmp(p1, p2, rqsort_arg); |
318 | } |
319 | |
320 | /* not reentrant, but not needed with emscripten */ |
321 | void rqsort(void *base, size_t nmemb, size_t size, |
322 | int (*cmp)(const void *, const void *, void *), |
323 | void *arg) |
324 | { |
325 | rqsort_arg = arg; |
326 | rqsort_cmp = cmp; |
327 | qsort(base, nmemb, size, rqsort_cmp2); |
328 | } |
329 | |
330 | #endif |
331 | |
332 | #else |
333 | |
334 | typedef void (*exchange_f)(void *a, void *b, size_t size); |
335 | typedef int (*cmp_f)(const void *, const void *, void *opaque); |
336 | |
337 | static void exchange_bytes(void *a, void *b, size_t size) { |
338 | uint8_t *ap = (uint8_t *)a; |
339 | uint8_t *bp = (uint8_t *)b; |
340 | |
341 | while (size-- != 0) { |
342 | uint8_t t = *ap; |
343 | *ap++ = *bp; |
344 | *bp++ = t; |
345 | } |
346 | } |
347 | |
348 | static void exchange_one_byte(void *a, void *b, size_t size) { |
349 | uint8_t *ap = (uint8_t *)a; |
350 | uint8_t *bp = (uint8_t *)b; |
351 | uint8_t t = *ap; |
352 | *ap = *bp; |
353 | *bp = t; |
354 | } |
355 | |
356 | static void exchange_int16s(void *a, void *b, size_t size) { |
357 | uint16_t *ap = (uint16_t *)a; |
358 | uint16_t *bp = (uint16_t *)b; |
359 | |
360 | for (size /= sizeof(uint16_t); size-- != 0;) { |
361 | uint16_t t = *ap; |
362 | *ap++ = *bp; |
363 | *bp++ = t; |
364 | } |
365 | } |
366 | |
367 | static void exchange_one_int16(void *a, void *b, size_t size) { |
368 | uint16_t *ap = (uint16_t *)a; |
369 | uint16_t *bp = (uint16_t *)b; |
370 | uint16_t t = *ap; |
371 | *ap = *bp; |
372 | *bp = t; |
373 | } |
374 | |
375 | static void exchange_int32s(void *a, void *b, size_t size) { |
376 | uint32_t *ap = (uint32_t *)a; |
377 | uint32_t *bp = (uint32_t *)b; |
378 | |
379 | for (size /= sizeof(uint32_t); size-- != 0;) { |
380 | uint32_t t = *ap; |
381 | *ap++ = *bp; |
382 | *bp++ = t; |
383 | } |
384 | } |
385 | |
386 | static void exchange_one_int32(void *a, void *b, size_t size) { |
387 | uint32_t *ap = (uint32_t *)a; |
388 | uint32_t *bp = (uint32_t *)b; |
389 | uint32_t t = *ap; |
390 | *ap = *bp; |
391 | *bp = t; |
392 | } |
393 | |
394 | static void exchange_int64s(void *a, void *b, size_t size) { |
395 | uint64_t *ap = (uint64_t *)a; |
396 | uint64_t *bp = (uint64_t *)b; |
397 | |
398 | for (size /= sizeof(uint64_t); size-- != 0;) { |
399 | uint64_t t = *ap; |
400 | *ap++ = *bp; |
401 | *bp++ = t; |
402 | } |
403 | } |
404 | |
405 | static void exchange_one_int64(void *a, void *b, size_t size) { |
406 | uint64_t *ap = (uint64_t *)a; |
407 | uint64_t *bp = (uint64_t *)b; |
408 | uint64_t t = *ap; |
409 | *ap = *bp; |
410 | *bp = t; |
411 | } |
412 | |
413 | static void exchange_int128s(void *a, void *b, size_t size) { |
414 | uint64_t *ap = (uint64_t *)a; |
415 | uint64_t *bp = (uint64_t *)b; |
416 | |
417 | for (size /= sizeof(uint64_t) * 2; size-- != 0; ap += 2, bp += 2) { |
418 | uint64_t t = ap[0]; |
419 | uint64_t u = ap[1]; |
420 | ap[0] = bp[0]; |
421 | ap[1] = bp[1]; |
422 | bp[0] = t; |
423 | bp[1] = u; |
424 | } |
425 | } |
426 | |
427 | static void exchange_one_int128(void *a, void *b, size_t size) { |
428 | uint64_t *ap = (uint64_t *)a; |
429 | uint64_t *bp = (uint64_t *)b; |
430 | uint64_t t = ap[0]; |
431 | uint64_t u = ap[1]; |
432 | ap[0] = bp[0]; |
433 | ap[1] = bp[1]; |
434 | bp[0] = t; |
435 | bp[1] = u; |
436 | } |
437 | |
438 | static inline exchange_f exchange_func(const void *base, size_t size) { |
439 | switch (((uintptr_t)base | (uintptr_t)size) & 15) { |
440 | case 0: |
441 | if (size == sizeof(uint64_t) * 2) |
442 | return exchange_one_int128; |
443 | else |
444 | return exchange_int128s; |
445 | case 8: |
446 | if (size == sizeof(uint64_t)) |
447 | return exchange_one_int64; |
448 | else |
449 | return exchange_int64s; |
450 | case 4: |
451 | case 12: |
452 | if (size == sizeof(uint32_t)) |
453 | return exchange_one_int32; |
454 | else |
455 | return exchange_int32s; |
456 | case 2: |
457 | case 6: |
458 | case 10: |
459 | case 14: |
460 | if (size == sizeof(uint16_t)) |
461 | return exchange_one_int16; |
462 | else |
463 | return exchange_int16s; |
464 | default: |
465 | if (size == 1) |
466 | return exchange_one_byte; |
467 | else |
468 | return exchange_bytes; |
469 | } |
470 | } |
471 | |
472 | static void heapsortx(void *base, size_t nmemb, size_t size, cmp_f cmp, void *opaque) |
473 | { |
474 | uint8_t *basep = (uint8_t *)base; |
475 | size_t i, n, c, r; |
476 | exchange_f swap = exchange_func(base, size); |
477 | |
478 | if (nmemb > 1) { |
479 | i = (nmemb / 2) * size; |
480 | n = nmemb * size; |
481 | |
482 | while (i > 0) { |
483 | i -= size; |
484 | for (r = i; (c = r * 2 + size) < n; r = c) { |
485 | if (c < n - size && cmp(basep + c, basep + c + size, opaque) <= 0) |
486 | c += size; |
487 | if (cmp(basep + r, basep + c, opaque) > 0) |
488 | break; |
489 | swap(basep + r, basep + c, size); |
490 | } |
491 | } |
492 | for (i = n - size; i > 0; i -= size) { |
493 | swap(basep, basep + i, size); |
494 | |
495 | for (r = 0; (c = r * 2 + size) < i; r = c) { |
496 | if (c < i - size && cmp(basep + c, basep + c + size, opaque) <= 0) |
497 | c += size; |
498 | if (cmp(basep + r, basep + c, opaque) > 0) |
499 | break; |
500 | swap(basep + r, basep + c, size); |
501 | } |
502 | } |
503 | } |
504 | } |
505 | |
506 | static inline void *med3(void *a, void *b, void *c, cmp_f cmp, void *opaque) |
507 | { |
508 | return cmp(a, b, opaque) < 0 ? |
509 | (cmp(b, c, opaque) < 0 ? b : (cmp(a, c, opaque) < 0 ? c : a )) : |
510 | (cmp(b, c, opaque) > 0 ? b : (cmp(a, c, opaque) < 0 ? a : c )); |
511 | } |
512 | |
513 | /* pointer based version with local stack and insertion sort threshhold */ |
514 | void rqsort(void *base, size_t nmemb, size_t size, cmp_f cmp, void *opaque) |
515 | { |
516 | struct { uint8_t *base; size_t count; int depth; } stack[50], *sp = stack; |
517 | uint8_t *ptr, *pi, *pj, *plt, *pgt, *top, *m; |
518 | size_t m4, i, lt, gt, span, span2; |
519 | int c, depth; |
520 | exchange_f swap = exchange_func(base, size); |
521 | exchange_f swap_block = exchange_func(base, size | 128); |
522 | |
523 | if (nmemb < 2 || size <= 0) |
524 | return; |
525 | |
526 | sp->base = (uint8_t *)base; |
527 | sp->count = nmemb; |
528 | sp->depth = 0; |
529 | sp++; |
530 | |
531 | while (sp > stack) { |
532 | sp--; |
533 | ptr = sp->base; |
534 | nmemb = sp->count; |
535 | depth = sp->depth; |
536 | |
537 | while (nmemb > 6) { |
538 | if (++depth > 50) { |
539 | /* depth check to ensure worst case logarithmic time */ |
540 | heapsortx(ptr, nmemb, size, cmp, opaque); |
541 | nmemb = 0; |
542 | break; |
543 | } |
544 | /* select median of 3 from 1/4, 1/2, 3/4 positions */ |
545 | /* should use median of 5 or 9? */ |
546 | m4 = (nmemb >> 2) * size; |
547 | m = med3(ptr + m4, ptr + 2 * m4, ptr + 3 * m4, cmp, opaque); |
548 | swap(ptr, m, size); /* move the pivot to the start or the array */ |
549 | i = lt = 1; |
550 | pi = plt = ptr + size; |
551 | gt = nmemb; |
552 | pj = pgt = top = ptr + nmemb * size; |
553 | for (;;) { |
554 | while (pi < pj && (c = cmp(ptr, pi, opaque)) >= 0) { |
555 | if (c == 0) { |
556 | swap(plt, pi, size); |
557 | lt++; |
558 | plt += size; |
559 | } |
560 | i++; |
561 | pi += size; |
562 | } |
563 | while (pi < (pj -= size) && (c = cmp(ptr, pj, opaque)) <= 0) { |
564 | if (c == 0) { |
565 | gt--; |
566 | pgt -= size; |
567 | swap(pgt, pj, size); |
568 | } |
569 | } |
570 | if (pi >= pj) |
571 | break; |
572 | swap(pi, pj, size); |
573 | i++; |
574 | pi += size; |
575 | } |
576 | /* array has 4 parts: |
577 | * from 0 to lt excluded: elements identical to pivot |
578 | * from lt to pi excluded: elements smaller than pivot |
579 | * from pi to gt excluded: elements greater than pivot |
580 | * from gt to n excluded: elements identical to pivot |
581 | */ |
582 | /* move elements identical to pivot in the middle of the array: */ |
583 | /* swap values in ranges [0..lt[ and [i-lt..i[ |
584 | swapping the smallest span between lt and i-lt is sufficient |
585 | */ |
586 | span = plt - ptr; |
587 | span2 = pi - plt; |
588 | lt = i - lt; |
589 | if (span > span2) |
590 | span = span2; |
591 | swap_block(ptr, pi - span, span); |
592 | /* swap values in ranges [gt..top[ and [i..top-(top-gt)[ |
593 | swapping the smallest span between top-gt and gt-i is sufficient |
594 | */ |
595 | span = top - pgt; |
596 | span2 = pgt - pi; |
597 | pgt = top - span2; |
598 | gt = nmemb - (gt - i); |
599 | if (span > span2) |
600 | span = span2; |
601 | swap_block(pi, top - span, span); |
602 | |
603 | /* now array has 3 parts: |
604 | * from 0 to lt excluded: elements smaller than pivot |
605 | * from lt to gt excluded: elements identical to pivot |
606 | * from gt to n excluded: elements greater than pivot |
607 | */ |
608 | /* stack the larger segment and keep processing the smaller one |
609 | to minimize stack use for pathological distributions */ |
610 | if (lt > nmemb - gt) { |
611 | sp->base = ptr; |
612 | sp->count = lt; |
613 | sp->depth = depth; |
614 | sp++; |
615 | ptr = pgt; |
616 | nmemb -= gt; |
617 | } else { |
618 | sp->base = pgt; |
619 | sp->count = nmemb - gt; |
620 | sp->depth = depth; |
621 | sp++; |
622 | nmemb = lt; |
623 | } |
624 | } |
625 | /* Use insertion sort for small fragments */ |
626 | for (pi = ptr + size, top = ptr + nmemb * size; pi < top; pi += size) { |
627 | for (pj = pi; pj > ptr && cmp(pj - size, pj, opaque) > 0; pj -= size) |
628 | swap(pj, pj - size, size); |
629 | } |
630 | } |
631 | } |
632 | |
633 | #endif |
634 | |