FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavutil/avsscanf.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 309 600 51.5%
Functions: 12 15 80.0%
Branches: 249 676 36.8%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2005-2014 Rich Felker, et al.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <errno.h>
25 #include <limits.h>
26 #include <math.h>
27 #include <stdarg.h>
28 #include <stddef.h>
29 #include <stdint.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <float.h>
33
34 #include "avstring.h"
35 #include "libm.h"
36
37 typedef struct FFFILE {
38 size_t buf_size;
39 unsigned char *buf;
40 unsigned char *rpos, *rend;
41 unsigned char *shend;
42 ptrdiff_t shlim, shcnt;
43 void *cookie;
44 size_t (*read)(struct FFFILE *, unsigned char *, size_t);
45 } FFFILE;
46
47 #define SIZE_hh -2
48 #define SIZE_h -1
49 #define SIZE_def 0
50 #define SIZE_l 1
51 #define SIZE_L 2
52 #define SIZE_ll 3
53
54 #define shcnt(f) ((f)->shcnt + ((f)->rpos - (f)->buf))
55
56 9439 static int fftoread(FFFILE *f)
57 {
58 9439 f->rpos = f->rend = f->buf + f->buf_size;
59 9439 return 0;
60 }
61
62 9439 static size_t ffstring_read(FFFILE *f, unsigned char *buf, size_t len)
63 {
64 9439 char *src = f->cookie;
65 9439 size_t k = len+256;
66 9439 char *end = memchr(src, 0, k);
67
68
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9439 if (end) k = end-src;
69
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9439 if (k < len) len = k;
70 9439 memcpy(buf, src, len);
71 9439 f->rpos = (void *)(src+len);
72 9439 f->rend = (void *)(src+k);
73 9439 f->cookie = src+k;
74
75 9439 return len;
76 }
77
78 9439 static int ffuflow(FFFILE *f)
79 {
80 unsigned char c;
81
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9439 if (!fftoread(f) && f->read(f, &c, 1)==1) return c;
82 144 return EOF;
83 }
84
85 40573 static void ffshlim(FFFILE *f, ptrdiff_t lim)
86 {
87 40573 f->shlim = lim;
88 40573 f->shcnt = f->buf - f->rpos;
89 /* If lim is nonzero, rend must be a valid pointer. */
90
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40573 if (lim && f->rend - f->rpos > lim)
91 17088 f->shend = f->rpos + lim;
92 else
93 23485 f->shend = f->rend;
94 40573 }
95
96 43615 static int ffshgetc(FFFILE *f)
97 {
98 int c;
99 43615 ptrdiff_t cnt = shcnt(f);
100
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43615 if (f->shlim && cnt >= f->shlim || (c=ffuflow(f)) < 0) {
101 34320 f->shcnt = f->buf - f->rpos + cnt;
102 34320 f->shend = 0;
103 34320 return EOF;
104 }
105 9295 cnt++;
106
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9295 if (f->shlim && f->rend - f->rpos > f->shlim - cnt)
107 8544 f->shend = f->rpos + (f->shlim - cnt);
108 else
109 751 f->shend = f->rend;
110 9295 f->shcnt = f->buf - f->rpos + cnt;
111
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9295 if (f->rpos[-1] != c) f->rpos[-1] = c;
112 9295 return c;
113 }
114
115 #define shlim(f, lim) ffshlim((f), (lim))
116 #define shgetc(f) (((f)->rpos < (f)->shend) ? *(f)->rpos++ : ffshgetc(f))
117 #define shunget(f) ((f)->shend ? (void)(f)->rpos-- : (void)0)
118
119 static const unsigned char table[] = { -1,
120 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
121 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
122 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
123 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,
124 -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
125 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
126 -1,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,
127 25,26,27,28,29,30,31,32,33,34,35,-1,-1,-1,-1,-1,
128 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
129 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
130 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
131 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
132 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
133 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
134 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
135 -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
136 };
137
138 2114 static unsigned long long ffintscan(FFFILE *f, unsigned base, int pok, unsigned long long lim)
139 {
140 2114 const unsigned char *val = table+1;
141 2114 int c, neg=0;
142 unsigned x;
143 unsigned long long y;
144
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2114 if (base > 36 || base == 1) {
145 errno = EINVAL;
146 return 0;
147 }
148
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2114 while (av_isspace((c=shgetc(f))));
149
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2114 if (c=='+' || c=='-') {
150 2 neg = -(c=='-');
151
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2 c = shgetc(f);
152 }
153
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2114 if ((base == 0 || base == 16) && c=='0') {
154 c = shgetc(f);
155 if ((c|32)=='x') {
156 c = shgetc(f);
157 if (val[c]>=16) {
158 shunget(f);
159 if (pok) shunget(f);
160 else shlim(f, 0);
161 return 0;
162 }
163 base = 16;
164 } else if (base == 0) {
165 base = 8;
166 }
167 } else {
168
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2114 if (base == 0) base = 10;
169
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2114 if (val[c] >= base) {
170
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57 shunget(f);
171 57 shlim(f, 0);
172 57 errno = EINVAL;
173 57 return 0;
174 }
175 }
176
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2057 if (base == 10) {
177
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5790 for (x=0; c-'0'<10U && x<=UINT_MAX/10-1; c=shgetc(f))
178
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3733 x = x*10 + (c-'0');
179
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2057 for (y=x; c-'0'<10U && y<=ULLONG_MAX/10 && 10*y<=ULLONG_MAX-(c-'0'); c=shgetc(f))
180 y = y*10 + (c-'0');
181
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2057 if (c-'0'>=10U) goto done;
182 } else if (!(base & base-1)) {
183 int bs = "\0\1\2\4\7\3\6\5"[(0x17*base)>>5&7];
184 for (x=0; val[c]<base && x<=UINT_MAX/32; c=shgetc(f))
185 x = x<<bs | val[c];
186 for (y=x; val[c]<base && y<=ULLONG_MAX>>bs; c=shgetc(f))
187 y = y<<bs | val[c];
188 } else {
189 for (x=0; val[c]<base && x<=UINT_MAX/36-1; c=shgetc(f))
190 x = x*base + val[c];
191 for (y=x; val[c]<base && y<=ULLONG_MAX/base && base*y<=ULLONG_MAX-val[c]; c=shgetc(f))
192 y = y*base + val[c];
193 }
194 if (val[c]<base) {
195 for (; val[c]<base; c=shgetc(f));
196 errno = ERANGE;
197 y = lim;
198 if (lim&1) neg = 0;
199 }
200 done:
201
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2057 shunget(f);
202
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2057 if (y>=lim) {
203 if (!(lim&1) && !neg) {
204 errno = ERANGE;
205 return lim-1;
206 } else if (y>lim) {
207 errno = ERANGE;
208 return lim;
209 }
210 }
211 2057 return (y^neg)-neg;
212 }
213
214 static long long scanexp(FFFILE *f, int pok)
215 {
216 int c;
217 int x;
218 long long y;
219 int neg = 0;
220
221 c = shgetc(f);
222 if (c=='+' || c=='-') {
223 neg = (c=='-');
224 c = shgetc(f);
225 if (c-'0'>=10U && pok) shunget(f);
226 }
227 if (c-'0'>=10U) {
228 shunget(f);
229 return LLONG_MIN;
230 }
231 for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
232 x = 10*x + (c-'0');
233 for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
234 y = 10*y + (c-'0');
235 for (; c-'0'<10U; c = shgetc(f));
236 shunget(f);
237 return neg ? -y : y;
238 }
239
240 #define LD_B1B_DIG 2
241 #define LD_B1B_MAX 9007199, 254740991
242 #define KMAX 128
243 #define MASK (KMAX-1)
244
245 61 static double decfloat(FFFILE *f, int c, int bits, int emin, int sign, int pok)
246 {
247 uint32_t x[KMAX];
248 static const uint32_t th[] = { LD_B1B_MAX };
249 int i, j, k, a, z;
250 61 long long lrp=0, dc=0;
251 61 long long e10=0;
252 61 int lnz = 0;
253 61 int gotdig = 0, gotrad = 0;
254 int rp;
255 int e2;
256 61 int emax = -emin-bits+3;
257 61 int denormal = 0;
258 double y;
259 61 double frac=0;
260 61 double bias=0;
261 static const int p10s[] = { 10, 100, 1000, 10000,
262 100000, 1000000, 10000000, 100000000 };
263
264 61 j=0;
265 61 k=0;
266
267 /* Don't let leading zeros consume buffer space */
268
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63 for (; c=='0'; c = shgetc(f)) gotdig=1;
269
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61 if (c=='.') {
270 2 gotrad = 1;
271
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2 for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
272 }
273
274 61 x[0] = 0;
275
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517 for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
276
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456 if (c == '.') {
277
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56 if (gotrad) break;
278 56 gotrad = 1;
279 56 lrp = dc;
280
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400 } else if (k < KMAX-3) {
281 400 dc++;
282
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400 if (c!='0') lnz = dc;
283
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400 if (j) x[k] = x[k]*10 + c-'0';
284 61 else x[k] = c-'0';
285
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400 if (++j==9) {
286 k++;
287 j=0;
288 }
289 400 gotdig=1;
290 } else {
291 dc++;
292 if (c!='0') {
293 lnz = (KMAX-4)*9;
294 x[KMAX-4] |= 1;
295 }
296 }
297 }
298
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61 if (!gotrad) lrp=dc;
299
300
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61 if (gotdig && (c|32)=='e') {
301 e10 = scanexp(f, pok);
302 if (e10 == LLONG_MIN) {
303 if (pok) {
304 shunget(f);
305 } else {
306 shlim(f, 0);
307 return 0;
308 }
309 e10 = 0;
310 }
311 lrp += e10;
312
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61 } else if (c>=0) {
313 shunget(f);
314 }
315
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61 if (!gotdig) {
316 errno = EINVAL;
317 shlim(f, 0);
318 return 0;
319 }
320
321 /* Handle zero specially to avoid nasty special cases later */
322
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61 if (!x[0]) return sign * 0.0;
323
324 /* Optimize small integers (w/no exponent) and over/under-flow */
325
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61 if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0))
326 3 return sign * (double)x[0];
327
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58 if (lrp > -emin/2) {
328 errno = ERANGE;
329 return sign * DBL_MAX * DBL_MAX;
330 }
331
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58 if (lrp < emin-2*DBL_MANT_DIG) {
332 errno = ERANGE;
333 return sign * DBL_MIN * DBL_MIN;
334 }
335
336 /* Align incomplete final B1B digit */
337
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58 if (j) {
338
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186 for (; j<9; j++) x[k]*=10;
339 58 k++;
340 58 j=0;
341 }
342
343 58 a = 0;
344 58 z = k;
345 58 e2 = 0;
346 58 rp = lrp;
347
348 /* Optimize small to mid-size integers (even in exp. notation) */
349
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58 if (lnz<9 && lnz<=rp && rp < 18) {
350 int bitlim;
351
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56 if (rp == 9) return sign * (double)x[0];
352
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56 if (rp < 9) return sign * (double)x[0] / p10s[8-rp];
353 bitlim = bits-3*(int)(rp-9);
354 if (bitlim>30 || x[0]>>bitlim==0)
355 return sign * (double)x[0] * p10s[rp-10];
356 }
357
358 /* Drop trailing zeros */
359
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2 for (; !x[z-1]; z--);
360
361 /* Align radix point to B1B digit boundary */
362
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2 if (rp % 9) {
363 int rpm9 = rp>=0 ? rp%9 : rp%9+9;
364 int p10 = p10s[8-rpm9];
365 uint32_t carry = 0;
366 for (k=a; k!=z; k++) {
367 uint32_t tmp = x[k] % p10;
368 x[k] = x[k]/p10 + carry;
369 carry = 1000000000/p10 * tmp;
370 if (k==a && !x[k]) {
371 a = (a+1 & MASK);
372 rp -= 9;
373 }
374 }
375 if (carry) x[z++] = carry;
376 rp += 9-rpm9;
377 }
378
379 /* Upscale until desired number of bits are left of radix point */
380
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6 while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
381 4 uint32_t carry = 0;
382 4 e2 -= 29;
383 6 for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
384 6 uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
385
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6 if (tmp > 1000000000) {
386 4 carry = tmp / 1000000000;
387 4 x[k] = tmp % 1000000000;
388 } else {
389 2 carry = 0;
390 2 x[k] = tmp;
391 }
392
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6 if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
393
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6 if (k==a) break;
394 }
395
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4 if (carry) {
396 4 rp += 9;
397 4 a = (a-1 & MASK);
398
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4 if (a == z) {
399 z = (z-1 & MASK);
400 x[z-1 & MASK] |= x[z];
401 }
402 4 x[a] = carry;
403 }
404 }
405
406 /* Downscale until exactly number of bits are left of radix point */
407 10 for (;;) {
408 12 uint32_t carry = 0;
409 12 int sh = 1;
410
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14 for (i=0; i<LD_B1B_DIG; i++) {
411 14 k = (a+i & MASK);
412
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14 if (k == z || x[k] < th[i]) {
413 2 i=LD_B1B_DIG;
414 2 break;
415 }
416
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12 if (x[a+i & MASK] > th[i]) break;
417 }
418
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12 if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
419 /* FIXME: find a way to compute optimal sh */
420
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10 if (rp > 9+9*LD_B1B_DIG) sh = 9;
421 10 e2 += sh;
422
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30 for (k=a; k!=z; k=(k+1 & MASK)) {
423 20 uint32_t tmp = x[k] & (1<<sh)-1;
424 20 x[k] = (x[k]>>sh) + carry;
425 20 carry = (1000000000>>sh) * tmp;
426
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20 if (k==a && !x[k]) {
427 a = (a+1 & MASK);
428 i--;
429 rp -= 9;
430 }
431 }
432
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10 if (carry) {
433 if ((z+1 & MASK) != a) {
434 x[z] = carry;
435 z = (z+1 & MASK);
436 } else x[z-1 & MASK] |= 1;
437 }
438 }
439
440 /* Assemble desired bits into floating point variable */
441
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6 for (y=i=0; i<LD_B1B_DIG; i++) {
442
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4 if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
443 4 y = 1000000000.0L * y + x[a+i & MASK];
444 }
445
446 2 y *= sign;
447
448 /* Limit precision for denormal results */
449
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2 if (bits > DBL_MANT_DIG+e2-emin) {
450 bits = DBL_MANT_DIG+e2-emin;
451 if (bits<0) bits=0;
452 denormal = 1;
453 }
454
455 /* Calculate bias term to force rounding, move out lower bits */
456
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2 if (bits < DBL_MANT_DIG) {
457 2 bias = copysign(scalbn(1, 2*DBL_MANT_DIG-bits-1), y);
458 2 frac = fmod(y, scalbn(1, DBL_MANT_DIG-bits));
459 2 y -= frac;
460 2 y += bias;
461 }
462
463 /* Process tail of decimal input so it can affect rounding */
464
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2 if ((a+i & MASK) != z) {
465 uint32_t t = x[a+i & MASK];
466 if (t < 500000000 && (t || (a+i+1 & MASK) != z))
467 frac += 0.25*sign;
468 else if (t > 500000000)
469 frac += 0.75*sign;
470 else if (t == 500000000) {
471 if ((a+i+1 & MASK) == z)
472 frac += 0.5*sign;
473 else
474 frac += 0.75*sign;
475 }
476 if (DBL_MANT_DIG-bits >= 2 && !fmod(frac, 1))
477 frac++;
478 }
479
480 2 y += frac;
481 2 y -= bias;
482
483
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2 if ((e2+DBL_MANT_DIG & INT_MAX) > emax-5) {
484 if (fabs(y) >= pow(2, DBL_MANT_DIG)) {
485 if (denormal && bits==DBL_MANT_DIG+e2-emin)
486 denormal = 0;
487 y *= 0.5;
488 e2++;
489 }
490 if (e2+DBL_MANT_DIG>emax || (denormal && frac))
491 errno = ERANGE;
492 }
493
494 2 return scalbn(y, e2);
495 }
496
497 static double hexfloat(FFFILE *f, int bits, int emin, int sign, int pok)
498 {
499 uint32_t x = 0;
500 double y = 0;
501 double scale = 1;
502 double bias = 0;
503 int gottail = 0, gotrad = 0, gotdig = 0;
504 long long rp = 0;
505 long long dc = 0;
506 long long e2 = 0;
507 int d;
508 int c;
509
510 c = shgetc(f);
511
512 /* Skip leading zeros */
513 for (; c=='0'; c = shgetc(f))
514 gotdig = 1;
515
516 if (c=='.') {
517 gotrad = 1;
518 c = shgetc(f);
519 /* Count zeros after the radix point before significand */
520 for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
521 }
522
523 for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
524 if (c=='.') {
525 if (gotrad) break;
526 rp = dc;
527 gotrad = 1;
528 } else {
529 gotdig = 1;
530 if (c > '9') d = (c|32)+10-'a';
531 else d = c-'0';
532 if (dc<8) {
533 x = x*16 + d;
534 } else if (dc < DBL_MANT_DIG/4+1) {
535 y += d*(scale/=16);
536 } else if (d && !gottail) {
537 y += 0.5*scale;
538 gottail = 1;
539 }
540 dc++;
541 }
542 }
543 if (!gotdig) {
544 shunget(f);
545 if (pok) {
546 shunget(f);
547 if (gotrad) shunget(f);
548 } else {
549 shlim(f, 0);
550 }
551 return sign * 0.0;
552 }
553 if (!gotrad) rp = dc;
554 while (dc<8) x *= 16, dc++;
555 if ((c|32)=='p') {
556 e2 = scanexp(f, pok);
557 if (e2 == LLONG_MIN) {
558 if (pok) {
559 shunget(f);
560 } else {
561 shlim(f, 0);
562 return 0;
563 }
564 e2 = 0;
565 }
566 } else {
567 shunget(f);
568 }
569 e2 += 4*rp - 32;
570
571 if (!x) return sign * 0.0;
572 if (e2 > -emin) {
573 errno = ERANGE;
574 return sign * DBL_MAX * DBL_MAX;
575 }
576 if (e2 < emin-2*DBL_MANT_DIG) {
577 errno = ERANGE;
578 return sign * DBL_MIN * DBL_MIN;
579 }
580
581 while (x < 0x80000000) {
582 if (y>=0.5) {
583 x += x + 1;
584 y += y - 1;
585 } else {
586 x += x;
587 y += y;
588 }
589 e2--;
590 }
591
592 if (bits > 32+e2-emin) {
593 bits = 32+e2-emin;
594 if (bits<0) bits=0;
595 }
596
597 if (bits < DBL_MANT_DIG)
598 bias = copysign(scalbn(1, 32+DBL_MANT_DIG-bits-1), sign);
599
600 if (bits<32 && y && !(x&1)) x++, y=0;
601
602 y = bias + sign*(double)x + sign*y;
603 y -= bias;
604
605 if (!y) errno = ERANGE;
606
607 return scalbn(y, e2);
608 }
609
610 61 static double fffloatscan(FFFILE *f, int prec, int pok)
611 {
612 61 int sign = 1;
613 size_t i;
614 int bits;
615 int emin;
616 int c;
617
618
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61 switch (prec) {
619 61 case 0:
620 61 bits = FLT_MANT_DIG;
621 61 emin = FLT_MIN_EXP-bits;
622 61 break;
623 case 1:
624 bits = DBL_MANT_DIG;
625 emin = DBL_MIN_EXP-bits;
626 break;
627 case 2:
628 bits = DBL_MANT_DIG;
629 emin = DBL_MIN_EXP-bits;
630 break;
631 default:
632 return 0;
633 }
634
635
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61 while (av_isspace((c = shgetc(f))));
636
637
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61 if (c=='+' || c=='-') {
638
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28 sign -= 2*(c=='-');
639
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28 c = shgetc(f);
640 }
641
642
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61 for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
643 if (i<7) c = shgetc(f);
644
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61 if (i==3 || i==8 || (i>3 && pok)) {
645 if (i!=8) {
646 shunget(f);
647 if (pok) for (; i>3; i--) shunget(f);
648 }
649 return sign * INFINITY;
650 }
651
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61 if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
652 if (i<2) c = shgetc(f);
653
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61 if (i==3) {
654 if (shgetc(f) != '(') {
655 shunget(f);
656 return NAN;
657 }
658 for (i=1; ; i++) {
659 c = shgetc(f);
660 if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
661 continue;
662 if (c==')') return NAN;
663 shunget(f);
664 if (!pok) {
665 errno = EINVAL;
666 shlim(f, 0);
667 return 0;
668 }
669 while (i--) shunget(f);
670 return NAN;
671 }
672 return NAN;
673 }
674
675
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61 if (i) {
676 shunget(f);
677 errno = EINVAL;
678 shlim(f, 0);
679 return 0;
680 }
681
682
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61 if (c=='0') {
683
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2 c = shgetc(f);
684
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2 if ((c|32) == 'x')
685 return hexfloat(f, bits, emin, sign, pok);
686
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2 shunget(f);
687 2 c = '0';
688 }
689
690 61 return decfloat(f, c, bits, emin, sign, pok);
691 }
692
693 static void *arg_n(va_list ap, unsigned int n)
694 {
695 void *p;
696 unsigned int i;
697 va_list ap2;
698 va_copy(ap2, ap);
699 for (i=n; i>1; i--) va_arg(ap2, void *);
700 p = va_arg(ap2, void *);
701 va_end(ap2);
702 return p;
703 }
704
705 2108 static void store_int(void *dest, int size, unsigned long long i)
706 {
707
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2108 if (!dest) return;
708
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2108 switch (size) {
709 case SIZE_hh:
710 *(char *)dest = i;
711 break;
712 case SIZE_h:
713 *(short *)dest = i;
714 break;
715 1830 case SIZE_def:
716 1830 *(int *)dest = i;
717 1830 break;
718 227 case SIZE_l:
719 227 *(long *)dest = i;
720 227 break;
721 51 case SIZE_ll:
722 51 *(long long *)dest = i;
723 51 break;
724 }
725 }
726
727 9299 static int ff_vfscanf(FFFILE *f, const char *fmt, va_list ap)
728 {
729 int width;
730 int size;
731 int base;
732 const unsigned char *p;
733 int c, t;
734 char *s;
735 9299 void *dest=NULL;
736 int invert;
737 9299 int matches=0;
738 unsigned long long x;
739 double y;
740 9299 ptrdiff_t pos = 0;
741 unsigned char scanset[257];
742 size_t i;
743
744
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47498 for (p=(const unsigned char *)fmt; *p; p++) {
745
746
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38388 if (av_isspace(*p)) {
747
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364 while (av_isspace(p[1])) p++;
748 364 shlim(f, 0);
749
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645 while (av_isspace(shgetc(f)));
750
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364 shunget(f);
751 364 pos += shcnt(f);
752 364 continue;
753 }
754
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38024 if (*p != '%' || p[1] == '%') {
755 1230 shlim(f, 0);
756
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1230 if (*p == '%') {
757 p++;
758 while (av_isspace((c=shgetc(f))));
759 } else {
760
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1230 c = shgetc(f);
761 }
762
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1230 if (c!=*p) {
763
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127 shunget(f);
764
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127 if (c<0) goto input_fail;
765 90 goto match_fail;
766 }
767 1103 pos += shcnt(f);
768 1103 continue;
769 }
770
771 36794 p++;
772
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36794 if (*p=='*') {
773 360 dest = 0; p++;
774
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36434 } else if (av_isdigit(*p) && p[1]=='$') {
775 dest = arg_n(ap, *p-'0'); p+=2;
776 } else {
777 36434 dest = va_arg(ap, void *);
778 }
779
780
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36794 for (width=0; av_isdigit(*p); p++) {
781 width = 10*width + *p - '0';
782 }
783
784
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36794 if (*p=='m') {
785 s = 0;
786 p++;
787 }
788
789 36794 size = SIZE_def;
790
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36794 switch (*p++) {
791 case 'h':
792 if (*p == 'h') p++, size = SIZE_hh;
793 else size = SIZE_h;
794 break;
795 297 case 'l':
796
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297 if (*p == 'l') p++, size = SIZE_ll;
797 227 else size = SIZE_l;
798 297 break;
799 case 'j':
800 size = SIZE_ll;
801 break;
802 case 'z':
803 case 't':
804 size = SIZE_l;
805 break;
806 case 'L':
807 size = SIZE_L;
808 break;
809 36497 case 'd': case 'i': case 'o': case 'u': case 'x':
810 case 'a': case 'e': case 'f': case 'g':
811 case 'A': case 'E': case 'F': case 'G': case 'X':
812 case 's': case 'c': case '[':
813 case 'S': case 'C':
814 case 'p': case 'n':
815 36497 p--;
816 36497 break;
817 default:
818 goto fmt_fail;
819 }
820
821 36794 t = *p;
822
823 /* C or S */
824
1/2
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36794 if ((t&0x2f) == 3) {
825 t |= 32;
826 size = SIZE_l;
827 }
828
829
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36794 switch (t) {
830 34177 case 'c':
831
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34177 if (width < 1) width = 1;
832 case '[':
833 34564 break;
834 51 case 'n':
835 51 store_int(dest, size, pos);
836 /* do not increment match count, etc! */
837 51 continue;
838 2179 default:
839 2179 shlim(f, 0);
840
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2362 while (av_isspace(shgetc(f)));
841
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2179 shunget(f);
842 2179 pos += shcnt(f);
843 }
844
845 36743 shlim(f, width);
846
4/4
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36743 if (shgetc(f) < 0) goto input_fail;
847
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36738 shunget(f);
848
849
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36738 switch (t) {
850 34563 case 's':
851 case 'c':
852 case '[':
853
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34563 if (t == 'c' || t == 's') {
854 34176 memset(scanset, -1, sizeof scanset);
855 34176 scanset[0] = 0;
856
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34176 if (t == 's') {
857 scanset[1 + '\t'] = 0;
858 scanset[1 + '\n'] = 0;
859 scanset[1 + '\v'] = 0;
860 scanset[1 + '\f'] = 0;
861 scanset[1 + '\r'] = 0;
862 scanset[1 + ' ' ] = 0;
863 }
864 } else {
865
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387 if (*++p == '^') p++, invert = 1;
866 360 else invert = 0;
867 387 memset(scanset, invert, sizeof scanset);
868 387 scanset[0] = 0;
869
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387 if (*p == '-') p++, scanset[1+'-'] = 1-invert;
870
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387 else if (*p == ']') p++, scanset[1+']'] = 1-invert;
871
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1134 for (; *p != ']'; p++) {
872
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747 if (!*p) goto fmt_fail;
873
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747 if (*p=='-' && p[1] && p[1] != ']')
874 for (c=p++[-1]; c<*p; c++)
875 scanset[1+c] = 1-invert;
876 747 scanset[1+*p] = 1-invert;
877 }
878 }
879 34563 s = 0;
880 34563 i = 0;
881
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34563 if ((s = dest)) {
882
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68667 while (scanset[(c=shgetc(f))+1])
883 34464 s[i++] = c;
884 } else {
885
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720 while (scanset[(c=shgetc(f))+1]);
886 }
887
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34563 shunget(f);
888
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34563 if (!shcnt(f)) goto match_fail;
889
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34563 if (t == 'c' && shcnt(f) != width) goto match_fail;
890
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34563 if (t != 'c') {
891
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387 if (s) s[i] = 0;
892 }
893 34563 break;
894 case 'p':
895 case 'X':
896 case 'x':
897 base = 16;
898 goto int_common;
899 case 'o':
900 base = 8;
901 goto int_common;
902 2114 case 'd':
903 case 'u':
904 2114 base = 10;
905 2114 goto int_common;
906 case 'i':
907 base = 0;
908 2114 int_common:
909 2114 x = ffintscan(f, base, 0, ULLONG_MAX);
910
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2114 if (!shcnt(f))
911 57 goto match_fail;
912
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2057 if (t=='p' && dest)
913 *(void **)dest = (void *)(uintptr_t)x;
914 else
915 2057 store_int(dest, size, x);
916 2057 break;
917 61 case 'a': case 'A':
918 case 'e': case 'E':
919 case 'f': case 'F':
920 case 'g': case 'G':
921 61 y = fffloatscan(f, size, 0);
922
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61 if (!shcnt(f))
923 goto match_fail;
924
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61 if (dest) {
925 switch (size) {
926 61 case SIZE_def:
927 61 *(float *)dest = y;
928 61 break;
929 case SIZE_l:
930 *(double *)dest = y;
931 break;
932 case SIZE_L:
933 *(double *)dest = y;
934 break;
935 }
936 }
937 61 break;
938 }
939
940 36681 pos += shcnt(f);
941
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36681 if (dest) matches++;
942 }
943 if (0) {
944 fmt_fail:
945 42 input_fail:
946
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42 if (!matches) matches--;
947 }
948 9148 match_fail:
949 9299 return matches;
950 }
951
952 9299 static int ff_vsscanf(const char *s, const char *fmt, va_list ap)
953 {
954 9299 FFFILE f = {
955 .buf = (void *)s, .cookie = (void *)s,
956 .read = ffstring_read,
957 };
958
959 9299 return ff_vfscanf(&f, fmt, ap);
960 }
961
962 9299 int av_sscanf(const char *string, const char *format, ...)
963 {
964 int ret;
965 va_list ap;
966 9299 va_start(ap, format);
967 9299 ret = ff_vsscanf(string, format, ap);
968 9299 va_end(ap);
969 9299 return ret;
970 }
971