1 | /* |
2 | * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | #include <stdio.h> |
11 | #include <string.h> |
12 | #include "internal/cryptlib.h" |
13 | #include "crypto/ctype.h" |
14 | #include "internal/numbers.h" |
15 | #include <openssl/bio.h> |
16 | |
17 | /* |
18 | * Copyright Patrick Powell 1995 |
19 | * This code is based on code written by Patrick Powell <papowell@astart.com> |
20 | * It may be used for any purpose as long as this notice remains intact |
21 | * on all source code distributions. |
22 | */ |
23 | |
24 | #ifdef HAVE_LONG_DOUBLE |
25 | # define LDOUBLE long double |
26 | #else |
27 | # define LDOUBLE double |
28 | #endif |
29 | |
30 | static int fmtstr(char **, char **, size_t *, size_t *, |
31 | const char *, int, int, int); |
32 | static int fmtint(char **, char **, size_t *, size_t *, |
33 | int64_t, int, int, int, int); |
34 | static int fmtfp(char **, char **, size_t *, size_t *, |
35 | LDOUBLE, int, int, int, int); |
36 | static int doapr_outch(char **, char **, size_t *, size_t *, int); |
37 | static int _dopr(char **sbuffer, char **buffer, |
38 | size_t *maxlen, size_t *retlen, int *truncated, |
39 | const char *format, va_list args); |
40 | |
41 | /* format read states */ |
42 | #define DP_S_DEFAULT 0 |
43 | #define DP_S_FLAGS 1 |
44 | #define DP_S_MIN 2 |
45 | #define DP_S_DOT 3 |
46 | #define DP_S_MAX 4 |
47 | #define DP_S_MOD 5 |
48 | #define DP_S_CONV 6 |
49 | #define DP_S_DONE 7 |
50 | |
51 | /* format flags - Bits */ |
52 | /* left-aligned padding */ |
53 | #define DP_F_MINUS (1 << 0) |
54 | /* print an explicit '+' for a value with positive sign */ |
55 | #define DP_F_PLUS (1 << 1) |
56 | /* print an explicit ' ' for a value with positive sign */ |
57 | #define DP_F_SPACE (1 << 2) |
58 | /* print 0/0x prefix for octal/hex and decimal point for floating point */ |
59 | #define DP_F_NUM (1 << 3) |
60 | /* print leading zeroes */ |
61 | #define DP_F_ZERO (1 << 4) |
62 | /* print HEX in UPPPERcase */ |
63 | #define DP_F_UP (1 << 5) |
64 | /* treat value as unsigned */ |
65 | #define DP_F_UNSIGNED (1 << 6) |
66 | |
67 | /* conversion flags */ |
68 | #define DP_C_SHORT 1 |
69 | #define DP_C_LONG 2 |
70 | #define DP_C_LDOUBLE 3 |
71 | #define DP_C_LLONG 4 |
72 | #define DP_C_SIZE 5 |
73 | |
74 | /* Floating point formats */ |
75 | #define F_FORMAT 0 |
76 | #define E_FORMAT 1 |
77 | #define G_FORMAT 2 |
78 | |
79 | /* some handy macros */ |
80 | #define char_to_int(p) (p - '0') |
81 | #define OSSL_MAX(p,q) ((p >= q) ? p : q) |
82 | |
83 | static int |
84 | _dopr(char **sbuffer, |
85 | char **buffer, |
86 | size_t *maxlen, |
87 | size_t *retlen, int *truncated, const char *format, va_list args) |
88 | { |
89 | char ch; |
90 | int64_t value; |
91 | LDOUBLE fvalue; |
92 | char *strvalue; |
93 | int min; |
94 | int max; |
95 | int state; |
96 | int flags; |
97 | int cflags; |
98 | size_t currlen; |
99 | |
100 | state = DP_S_DEFAULT; |
101 | flags = currlen = cflags = min = 0; |
102 | max = -1; |
103 | ch = *format++; |
104 | |
105 | while (state != DP_S_DONE) { |
106 | if (ch == '\0' || (buffer == NULL && currlen >= *maxlen)) |
107 | state = DP_S_DONE; |
108 | |
109 | switch (state) { |
110 | case DP_S_DEFAULT: |
111 | if (ch == '%') |
112 | state = DP_S_FLAGS; |
113 | else |
114 | if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, ch)) |
115 | return 0; |
116 | ch = *format++; |
117 | break; |
118 | case DP_S_FLAGS: |
119 | switch (ch) { |
120 | case '-': |
121 | flags |= DP_F_MINUS; |
122 | ch = *format++; |
123 | break; |
124 | case '+': |
125 | flags |= DP_F_PLUS; |
126 | ch = *format++; |
127 | break; |
128 | case ' ': |
129 | flags |= DP_F_SPACE; |
130 | ch = *format++; |
131 | break; |
132 | case '#': |
133 | flags |= DP_F_NUM; |
134 | ch = *format++; |
135 | break; |
136 | case '0': |
137 | flags |= DP_F_ZERO; |
138 | ch = *format++; |
139 | break; |
140 | default: |
141 | state = DP_S_MIN; |
142 | break; |
143 | } |
144 | break; |
145 | case DP_S_MIN: |
146 | if (ossl_isdigit(ch)) { |
147 | min = 10 * min + char_to_int(ch); |
148 | ch = *format++; |
149 | } else if (ch == '*') { |
150 | min = va_arg(args, int); |
151 | ch = *format++; |
152 | state = DP_S_DOT; |
153 | } else |
154 | state = DP_S_DOT; |
155 | break; |
156 | case DP_S_DOT: |
157 | if (ch == '.') { |
158 | state = DP_S_MAX; |
159 | ch = *format++; |
160 | } else |
161 | state = DP_S_MOD; |
162 | break; |
163 | case DP_S_MAX: |
164 | if (ossl_isdigit(ch)) { |
165 | if (max < 0) |
166 | max = 0; |
167 | max = 10 * max + char_to_int(ch); |
168 | ch = *format++; |
169 | } else if (ch == '*') { |
170 | max = va_arg(args, int); |
171 | ch = *format++; |
172 | state = DP_S_MOD; |
173 | } else |
174 | state = DP_S_MOD; |
175 | break; |
176 | case DP_S_MOD: |
177 | switch (ch) { |
178 | case 'h': |
179 | cflags = DP_C_SHORT; |
180 | ch = *format++; |
181 | break; |
182 | case 'l': |
183 | if (*format == 'l') { |
184 | cflags = DP_C_LLONG; |
185 | format++; |
186 | } else |
187 | cflags = DP_C_LONG; |
188 | ch = *format++; |
189 | break; |
190 | case 'q': |
191 | case 'j': |
192 | cflags = DP_C_LLONG; |
193 | ch = *format++; |
194 | break; |
195 | case 'L': |
196 | cflags = DP_C_LDOUBLE; |
197 | ch = *format++; |
198 | break; |
199 | case 'z': |
200 | cflags = DP_C_SIZE; |
201 | ch = *format++; |
202 | break; |
203 | default: |
204 | break; |
205 | } |
206 | state = DP_S_CONV; |
207 | break; |
208 | case DP_S_CONV: |
209 | switch (ch) { |
210 | case 'd': |
211 | case 'i': |
212 | switch (cflags) { |
213 | case DP_C_SHORT: |
214 | value = (short int)va_arg(args, int); |
215 | break; |
216 | case DP_C_LONG: |
217 | value = va_arg(args, long int); |
218 | break; |
219 | case DP_C_LLONG: |
220 | value = va_arg(args, int64_t); |
221 | break; |
222 | case DP_C_SIZE: |
223 | value = va_arg(args, ossl_ssize_t); |
224 | break; |
225 | default: |
226 | value = va_arg(args, int); |
227 | break; |
228 | } |
229 | if (!fmtint(sbuffer, buffer, &currlen, maxlen, value, 10, min, |
230 | max, flags)) |
231 | return 0; |
232 | break; |
233 | case 'X': |
234 | flags |= DP_F_UP; |
235 | /* FALLTHROUGH */ |
236 | case 'x': |
237 | case 'o': |
238 | case 'u': |
239 | flags |= DP_F_UNSIGNED; |
240 | switch (cflags) { |
241 | case DP_C_SHORT: |
242 | value = (unsigned short int)va_arg(args, unsigned int); |
243 | break; |
244 | case DP_C_LONG: |
245 | value = va_arg(args, unsigned long int); |
246 | break; |
247 | case DP_C_LLONG: |
248 | value = va_arg(args, uint64_t); |
249 | break; |
250 | case DP_C_SIZE: |
251 | value = va_arg(args, size_t); |
252 | break; |
253 | default: |
254 | value = va_arg(args, unsigned int); |
255 | break; |
256 | } |
257 | if (!fmtint(sbuffer, buffer, &currlen, maxlen, value, |
258 | ch == 'o' ? 8 : (ch == 'u' ? 10 : 16), |
259 | min, max, flags)) |
260 | return 0; |
261 | break; |
262 | case 'f': |
263 | if (cflags == DP_C_LDOUBLE) |
264 | fvalue = va_arg(args, LDOUBLE); |
265 | else |
266 | fvalue = va_arg(args, double); |
267 | if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max, |
268 | flags, F_FORMAT)) |
269 | return 0; |
270 | break; |
271 | case 'E': |
272 | flags |= DP_F_UP; |
273 | /* fall thru */ |
274 | case 'e': |
275 | if (cflags == DP_C_LDOUBLE) |
276 | fvalue = va_arg(args, LDOUBLE); |
277 | else |
278 | fvalue = va_arg(args, double); |
279 | if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max, |
280 | flags, E_FORMAT)) |
281 | return 0; |
282 | break; |
283 | case 'G': |
284 | flags |= DP_F_UP; |
285 | /* fall thru */ |
286 | case 'g': |
287 | if (cflags == DP_C_LDOUBLE) |
288 | fvalue = va_arg(args, LDOUBLE); |
289 | else |
290 | fvalue = va_arg(args, double); |
291 | if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max, |
292 | flags, G_FORMAT)) |
293 | return 0; |
294 | break; |
295 | case 'c': |
296 | if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, |
297 | va_arg(args, int))) |
298 | return 0; |
299 | break; |
300 | case 's': |
301 | strvalue = va_arg(args, char *); |
302 | if (max < 0) { |
303 | if (buffer) |
304 | max = INT_MAX; |
305 | else |
306 | max = *maxlen; |
307 | } |
308 | if (!fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue, |
309 | flags, min, max)) |
310 | return 0; |
311 | break; |
312 | case 'p': |
313 | value = (size_t)va_arg(args, void *); |
314 | if (!fmtint(sbuffer, buffer, &currlen, maxlen, |
315 | value, 16, min, max, flags | DP_F_NUM)) |
316 | return 0; |
317 | break; |
318 | case 'n': |
319 | { |
320 | int *num; |
321 | num = va_arg(args, int *); |
322 | *num = currlen; |
323 | } |
324 | break; |
325 | case '%': |
326 | if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, ch)) |
327 | return 0; |
328 | break; |
329 | case 'w': |
330 | /* not supported yet, treat as next char */ |
331 | ch = *format++; |
332 | break; |
333 | default: |
334 | /* unknown, skip */ |
335 | break; |
336 | } |
337 | ch = *format++; |
338 | state = DP_S_DEFAULT; |
339 | flags = cflags = min = 0; |
340 | max = -1; |
341 | break; |
342 | case DP_S_DONE: |
343 | break; |
344 | default: |
345 | break; |
346 | } |
347 | } |
348 | /* |
349 | * We have to truncate if there is no dynamic buffer and we have filled the |
350 | * static buffer. |
351 | */ |
352 | if (buffer == NULL) { |
353 | *truncated = (currlen > *maxlen - 1); |
354 | if (*truncated) |
355 | currlen = *maxlen - 1; |
356 | } |
357 | if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0')) |
358 | return 0; |
359 | *retlen = currlen - 1; |
360 | return 1; |
361 | } |
362 | |
363 | static int |
364 | fmtstr(char **sbuffer, |
365 | char **buffer, |
366 | size_t *currlen, |
367 | size_t *maxlen, const char *value, int flags, int min, int max) |
368 | { |
369 | int padlen; |
370 | size_t strln; |
371 | int cnt = 0; |
372 | |
373 | if (value == 0) |
374 | value = "<NULL>" ; |
375 | |
376 | strln = OPENSSL_strnlen(value, max < 0 ? SIZE_MAX : (size_t)max); |
377 | |
378 | padlen = min - strln; |
379 | if (min < 0 || padlen < 0) |
380 | padlen = 0; |
381 | if (max >= 0) { |
382 | /* |
383 | * Calculate the maximum output including padding. |
384 | * Make sure max doesn't overflow into negativity |
385 | */ |
386 | if (max < INT_MAX - padlen) |
387 | max += padlen; |
388 | else |
389 | max = INT_MAX; |
390 | } |
391 | if (flags & DP_F_MINUS) |
392 | padlen = -padlen; |
393 | |
394 | while ((padlen > 0) && (max < 0 || cnt < max)) { |
395 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
396 | return 0; |
397 | --padlen; |
398 | ++cnt; |
399 | } |
400 | while (strln > 0 && (max < 0 || cnt < max)) { |
401 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, *value++)) |
402 | return 0; |
403 | --strln; |
404 | ++cnt; |
405 | } |
406 | while ((padlen < 0) && (max < 0 || cnt < max)) { |
407 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
408 | return 0; |
409 | ++padlen; |
410 | ++cnt; |
411 | } |
412 | return 1; |
413 | } |
414 | |
415 | static int |
416 | fmtint(char **sbuffer, |
417 | char **buffer, |
418 | size_t *currlen, |
419 | size_t *maxlen, int64_t value, int base, int min, int max, int flags) |
420 | { |
421 | int signvalue = 0; |
422 | const char *prefix = "" ; |
423 | uint64_t uvalue; |
424 | char convert[DECIMAL_SIZE(value) + 3]; |
425 | int place = 0; |
426 | int spadlen = 0; |
427 | int zpadlen = 0; |
428 | int caps = 0; |
429 | |
430 | if (max < 0) |
431 | max = 0; |
432 | uvalue = value; |
433 | if (!(flags & DP_F_UNSIGNED)) { |
434 | if (value < 0) { |
435 | signvalue = '-'; |
436 | uvalue = 0 - (uint64_t)value; |
437 | } else if (flags & DP_F_PLUS) |
438 | signvalue = '+'; |
439 | else if (flags & DP_F_SPACE) |
440 | signvalue = ' '; |
441 | } |
442 | if (flags & DP_F_NUM) { |
443 | if (base == 8) |
444 | prefix = "0" ; |
445 | if (base == 16) |
446 | prefix = "0x" ; |
447 | } |
448 | if (flags & DP_F_UP) |
449 | caps = 1; |
450 | do { |
451 | convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef" ) |
452 | [uvalue % (unsigned)base]; |
453 | uvalue = (uvalue / (unsigned)base); |
454 | } while (uvalue && (place < (int)sizeof(convert))); |
455 | if (place == sizeof(convert)) |
456 | place--; |
457 | convert[place] = 0; |
458 | |
459 | zpadlen = max - place; |
460 | spadlen = |
461 | min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix); |
462 | if (zpadlen < 0) |
463 | zpadlen = 0; |
464 | if (spadlen < 0) |
465 | spadlen = 0; |
466 | if (flags & DP_F_ZERO) { |
467 | zpadlen = OSSL_MAX(zpadlen, spadlen); |
468 | spadlen = 0; |
469 | } |
470 | if (flags & DP_F_MINUS) |
471 | spadlen = -spadlen; |
472 | |
473 | /* spaces */ |
474 | while (spadlen > 0) { |
475 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
476 | return 0; |
477 | --spadlen; |
478 | } |
479 | |
480 | /* sign */ |
481 | if (signvalue) |
482 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue)) |
483 | return 0; |
484 | |
485 | /* prefix */ |
486 | while (*prefix) { |
487 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix)) |
488 | return 0; |
489 | prefix++; |
490 | } |
491 | |
492 | /* zeros */ |
493 | if (zpadlen > 0) { |
494 | while (zpadlen > 0) { |
495 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0')) |
496 | return 0; |
497 | --zpadlen; |
498 | } |
499 | } |
500 | /* digits */ |
501 | while (place > 0) { |
502 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place])) |
503 | return 0; |
504 | } |
505 | |
506 | /* left justified spaces */ |
507 | while (spadlen < 0) { |
508 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
509 | return 0; |
510 | ++spadlen; |
511 | } |
512 | return 1; |
513 | } |
514 | |
515 | static LDOUBLE abs_val(LDOUBLE value) |
516 | { |
517 | LDOUBLE result = value; |
518 | if (value < 0) |
519 | result = -value; |
520 | return result; |
521 | } |
522 | |
523 | static LDOUBLE pow_10(int in_exp) |
524 | { |
525 | LDOUBLE result = 1; |
526 | while (in_exp) { |
527 | result *= 10; |
528 | in_exp--; |
529 | } |
530 | return result; |
531 | } |
532 | |
533 | static long roundv(LDOUBLE value) |
534 | { |
535 | long intpart; |
536 | intpart = (long)value; |
537 | value = value - intpart; |
538 | if (value >= 0.5) |
539 | intpart++; |
540 | return intpart; |
541 | } |
542 | |
543 | static int |
544 | fmtfp(char **sbuffer, |
545 | char **buffer, |
546 | size_t *currlen, |
547 | size_t *maxlen, LDOUBLE fvalue, int min, int max, int flags, int style) |
548 | { |
549 | int signvalue = 0; |
550 | LDOUBLE ufvalue; |
551 | LDOUBLE tmpvalue; |
552 | char iconvert[20]; |
553 | char fconvert[20]; |
554 | char econvert[20]; |
555 | int iplace = 0; |
556 | int fplace = 0; |
557 | int eplace = 0; |
558 | int padlen = 0; |
559 | int zpadlen = 0; |
560 | long exp = 0; |
561 | unsigned long intpart; |
562 | unsigned long fracpart; |
563 | unsigned long max10; |
564 | int realstyle; |
565 | |
566 | if (max < 0) |
567 | max = 6; |
568 | |
569 | if (fvalue < 0) |
570 | signvalue = '-'; |
571 | else if (flags & DP_F_PLUS) |
572 | signvalue = '+'; |
573 | else if (flags & DP_F_SPACE) |
574 | signvalue = ' '; |
575 | |
576 | /* |
577 | * G_FORMAT sometimes prints like E_FORMAT and sometimes like F_FORMAT |
578 | * depending on the number to be printed. Work out which one it is and use |
579 | * that from here on. |
580 | */ |
581 | if (style == G_FORMAT) { |
582 | if (fvalue == 0.0) { |
583 | realstyle = F_FORMAT; |
584 | } else if (fvalue < 0.0001) { |
585 | realstyle = E_FORMAT; |
586 | } else if ((max == 0 && fvalue >= 10) |
587 | || (max > 0 && fvalue >= pow_10(max))) { |
588 | realstyle = E_FORMAT; |
589 | } else { |
590 | realstyle = F_FORMAT; |
591 | } |
592 | } else { |
593 | realstyle = style; |
594 | } |
595 | |
596 | if (style != F_FORMAT) { |
597 | tmpvalue = fvalue; |
598 | /* Calculate the exponent */ |
599 | if (fvalue != 0.0) { |
600 | while (tmpvalue < 1) { |
601 | tmpvalue *= 10; |
602 | exp--; |
603 | } |
604 | while (tmpvalue > 10) { |
605 | tmpvalue /= 10; |
606 | exp++; |
607 | } |
608 | } |
609 | if (style == G_FORMAT) { |
610 | /* |
611 | * In G_FORMAT the "precision" represents significant digits. We |
612 | * always have at least 1 significant digit. |
613 | */ |
614 | if (max == 0) |
615 | max = 1; |
616 | /* Now convert significant digits to decimal places */ |
617 | if (realstyle == F_FORMAT) { |
618 | max -= (exp + 1); |
619 | if (max < 0) { |
620 | /* |
621 | * Should not happen. If we're in F_FORMAT then exp < max? |
622 | */ |
623 | return 0; |
624 | } |
625 | } else { |
626 | /* |
627 | * In E_FORMAT there is always one significant digit in front |
628 | * of the decimal point, so: |
629 | * significant digits == 1 + decimal places |
630 | */ |
631 | max--; |
632 | } |
633 | } |
634 | if (realstyle == E_FORMAT) |
635 | fvalue = tmpvalue; |
636 | } |
637 | ufvalue = abs_val(fvalue); |
638 | if (ufvalue > ULONG_MAX) { |
639 | /* Number too big */ |
640 | return 0; |
641 | } |
642 | intpart = (unsigned long)ufvalue; |
643 | |
644 | /* |
645 | * sorry, we only support 9 digits past the decimal because of our |
646 | * conversion method |
647 | */ |
648 | if (max > 9) |
649 | max = 9; |
650 | |
651 | /* |
652 | * we "cheat" by converting the fractional part to integer by multiplying |
653 | * by a factor of 10 |
654 | */ |
655 | max10 = roundv(pow_10(max)); |
656 | fracpart = roundv(pow_10(max) * (ufvalue - intpart)); |
657 | |
658 | if (fracpart >= max10) { |
659 | intpart++; |
660 | fracpart -= max10; |
661 | } |
662 | |
663 | /* convert integer part */ |
664 | do { |
665 | iconvert[iplace++] = "0123456789" [intpart % 10]; |
666 | intpart = (intpart / 10); |
667 | } while (intpart && (iplace < (int)sizeof(iconvert))); |
668 | if (iplace == sizeof(iconvert)) |
669 | iplace--; |
670 | iconvert[iplace] = 0; |
671 | |
672 | /* convert fractional part */ |
673 | while (fplace < max) { |
674 | if (style == G_FORMAT && fplace == 0 && (fracpart % 10) == 0) { |
675 | /* We strip trailing zeros in G_FORMAT */ |
676 | max--; |
677 | fracpart = fracpart / 10; |
678 | if (fplace < max) |
679 | continue; |
680 | break; |
681 | } |
682 | fconvert[fplace++] = "0123456789" [fracpart % 10]; |
683 | fracpart = (fracpart / 10); |
684 | } |
685 | |
686 | if (fplace == sizeof(fconvert)) |
687 | fplace--; |
688 | fconvert[fplace] = 0; |
689 | |
690 | /* convert exponent part */ |
691 | if (realstyle == E_FORMAT) { |
692 | int tmpexp; |
693 | if (exp < 0) |
694 | tmpexp = -exp; |
695 | else |
696 | tmpexp = exp; |
697 | |
698 | do { |
699 | econvert[eplace++] = "0123456789" [tmpexp % 10]; |
700 | tmpexp = (tmpexp / 10); |
701 | } while (tmpexp > 0 && eplace < (int)sizeof(econvert)); |
702 | /* Exponent is huge!! Too big to print */ |
703 | if (tmpexp > 0) |
704 | return 0; |
705 | /* Add a leading 0 for single digit exponents */ |
706 | if (eplace == 1) |
707 | econvert[eplace++] = '0'; |
708 | } |
709 | |
710 | /* |
711 | * -1 for decimal point (if we have one, i.e. max > 0), |
712 | * another -1 if we are printing a sign |
713 | */ |
714 | padlen = min - iplace - max - (max > 0 ? 1 : 0) - ((signvalue) ? 1 : 0); |
715 | /* Take some off for exponent prefix "+e" and exponent */ |
716 | if (realstyle == E_FORMAT) |
717 | padlen -= 2 + eplace; |
718 | zpadlen = max - fplace; |
719 | if (zpadlen < 0) |
720 | zpadlen = 0; |
721 | if (padlen < 0) |
722 | padlen = 0; |
723 | if (flags & DP_F_MINUS) |
724 | padlen = -padlen; |
725 | |
726 | if ((flags & DP_F_ZERO) && (padlen > 0)) { |
727 | if (signvalue) { |
728 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue)) |
729 | return 0; |
730 | --padlen; |
731 | signvalue = 0; |
732 | } |
733 | while (padlen > 0) { |
734 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0')) |
735 | return 0; |
736 | --padlen; |
737 | } |
738 | } |
739 | while (padlen > 0) { |
740 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
741 | return 0; |
742 | --padlen; |
743 | } |
744 | if (signvalue && !doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue)) |
745 | return 0; |
746 | |
747 | while (iplace > 0) { |
748 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace])) |
749 | return 0; |
750 | } |
751 | |
752 | /* |
753 | * Decimal point. This should probably use locale to find the correct |
754 | * char to print out. |
755 | */ |
756 | if (max > 0 || (flags & DP_F_NUM)) { |
757 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '.')) |
758 | return 0; |
759 | |
760 | while (fplace > 0) { |
761 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, |
762 | fconvert[--fplace])) |
763 | return 0; |
764 | } |
765 | } |
766 | while (zpadlen > 0) { |
767 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0')) |
768 | return 0; |
769 | --zpadlen; |
770 | } |
771 | if (realstyle == E_FORMAT) { |
772 | char ech; |
773 | |
774 | if ((flags & DP_F_UP) == 0) |
775 | ech = 'e'; |
776 | else |
777 | ech = 'E'; |
778 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ech)) |
779 | return 0; |
780 | if (exp < 0) { |
781 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '-')) |
782 | return 0; |
783 | } else { |
784 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '+')) |
785 | return 0; |
786 | } |
787 | while (eplace > 0) { |
788 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, |
789 | econvert[--eplace])) |
790 | return 0; |
791 | } |
792 | } |
793 | |
794 | while (padlen < 0) { |
795 | if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' ')) |
796 | return 0; |
797 | ++padlen; |
798 | } |
799 | return 1; |
800 | } |
801 | |
802 | #define BUFFER_INC 1024 |
803 | |
804 | static int |
805 | doapr_outch(char **sbuffer, |
806 | char **buffer, size_t *currlen, size_t *maxlen, int c) |
807 | { |
808 | /* If we haven't at least one buffer, someone has done a big booboo */ |
809 | if (!ossl_assert(*sbuffer != NULL || buffer != NULL)) |
810 | return 0; |
811 | |
812 | /* |currlen| must always be <= |*maxlen| */ |
813 | if (!ossl_assert(*currlen <= *maxlen)) |
814 | return 0; |
815 | |
816 | if (buffer && *currlen == *maxlen) { |
817 | if (*maxlen > INT_MAX - BUFFER_INC) |
818 | return 0; |
819 | |
820 | *maxlen += BUFFER_INC; |
821 | if (*buffer == NULL) { |
822 | if ((*buffer = OPENSSL_malloc(*maxlen)) == NULL) { |
823 | BIOerr(BIO_F_DOAPR_OUTCH, ERR_R_MALLOC_FAILURE); |
824 | return 0; |
825 | } |
826 | if (*currlen > 0) { |
827 | if (!ossl_assert(*sbuffer != NULL)) |
828 | return 0; |
829 | memcpy(*buffer, *sbuffer, *currlen); |
830 | } |
831 | *sbuffer = NULL; |
832 | } else { |
833 | char *tmpbuf; |
834 | tmpbuf = OPENSSL_realloc(*buffer, *maxlen); |
835 | if (tmpbuf == NULL) |
836 | return 0; |
837 | *buffer = tmpbuf; |
838 | } |
839 | } |
840 | |
841 | if (*currlen < *maxlen) { |
842 | if (*sbuffer) |
843 | (*sbuffer)[(*currlen)++] = (char)c; |
844 | else |
845 | (*buffer)[(*currlen)++] = (char)c; |
846 | } |
847 | |
848 | return 1; |
849 | } |
850 | |
851 | /***************************************************************************/ |
852 | |
853 | int BIO_printf(BIO *bio, const char *format, ...) |
854 | { |
855 | va_list args; |
856 | int ret; |
857 | |
858 | va_start(args, format); |
859 | |
860 | ret = BIO_vprintf(bio, format, args); |
861 | |
862 | va_end(args); |
863 | return ret; |
864 | } |
865 | |
866 | int BIO_vprintf(BIO *bio, const char *format, va_list args) |
867 | { |
868 | int ret; |
869 | size_t retlen; |
870 | char hugebuf[1024 * 2]; /* Was previously 10k, which is unreasonable |
871 | * in small-stack environments, like threads |
872 | * or DOS programs. */ |
873 | char *hugebufp = hugebuf; |
874 | size_t hugebufsize = sizeof(hugebuf); |
875 | char *dynbuf = NULL; |
876 | int ignored; |
877 | |
878 | dynbuf = NULL; |
879 | if (!_dopr(&hugebufp, &dynbuf, &hugebufsize, &retlen, &ignored, format, |
880 | args)) { |
881 | OPENSSL_free(dynbuf); |
882 | return -1; |
883 | } |
884 | if (dynbuf) { |
885 | ret = BIO_write(bio, dynbuf, (int)retlen); |
886 | OPENSSL_free(dynbuf); |
887 | } else { |
888 | ret = BIO_write(bio, hugebuf, (int)retlen); |
889 | } |
890 | return ret; |
891 | } |
892 | |
893 | /* |
894 | * As snprintf is not available everywhere, we provide our own |
895 | * implementation. This function has nothing to do with BIOs, but it's |
896 | * closely related to BIO_printf, and we need *some* name prefix ... (XXX the |
897 | * function should be renamed, but to what?) |
898 | */ |
899 | int BIO_snprintf(char *buf, size_t n, const char *format, ...) |
900 | { |
901 | va_list args; |
902 | int ret; |
903 | |
904 | va_start(args, format); |
905 | |
906 | ret = BIO_vsnprintf(buf, n, format, args); |
907 | |
908 | va_end(args); |
909 | return ret; |
910 | } |
911 | |
912 | int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args) |
913 | { |
914 | size_t retlen; |
915 | int truncated; |
916 | |
917 | if (!_dopr(&buf, NULL, &n, &retlen, &truncated, format, args)) |
918 | return -1; |
919 | |
920 | if (truncated) |
921 | /* |
922 | * In case of truncation, return -1 like traditional snprintf. |
923 | * (Current drafts for ISO/IEC 9899 say snprintf should return the |
924 | * number of characters that would have been written, had the buffer |
925 | * been large enough.) |
926 | */ |
927 | return -1; |
928 | else |
929 | return (retlen <= INT_MAX) ? (int)retlen : -1; |
930 | } |
931 | |