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source: vbox/trunk/src/libs/openssl-3.0.2/crypto/bio/bio_print.c@ 94403

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libs/openssl-3.0.1: Export to OSE and fix copyright headers in Makefiles, bugref:10128
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1/*
2 * Copyright 1995-2021 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 <[email protected]>
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
30static int fmtstr(char **, char **, size_t *, size_t *,
31 const char *, int, int, int);
32static int fmtint(char **, char **, size_t *, size_t *,
33 int64_t, int, int, int, int);
34static int fmtfp(char **, char **, size_t *, size_t *,
35 LDOUBLE, int, int, int, int);
36static int doapr_outch(char **, char **, size_t *, size_t *, int);
37static 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
83static 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 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
363static int
364fmtstr(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
415static int
416fmtint(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
515static LDOUBLE abs_val(LDOUBLE value)
516{
517 LDOUBLE result = value;
518 if (value < 0)
519 result = -value;
520 return result;
521}
522
523static 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
533static 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
543static int
544fmtfp(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 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
624 return 0;
625 }
626 } else {
627 /*
628 * In E_FORMAT there is always one significant digit in front
629 * of the decimal point, so:
630 * significant digits == 1 + decimal places
631 */
632 max--;
633 }
634 }
635 if (realstyle == E_FORMAT)
636 fvalue = tmpvalue;
637 }
638 ufvalue = abs_val(fvalue);
639 /*
640 * By subtracting 65535 (2^16-1) we cancel the low order 15 bits
641 * of ULONG_MAX to avoid using imprecise floating point values.
642 */
643 if (ufvalue >= (double)(ULONG_MAX - 65535) + 65536.0) {
644 /* Number too big */
645 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
646 return 0;
647 }
648 intpart = (unsigned long)ufvalue;
649
650 /*
651 * sorry, we only support 9 digits past the decimal because of our
652 * conversion method
653 */
654 if (max > 9)
655 max = 9;
656
657 /*
658 * we "cheat" by converting the fractional part to integer by multiplying
659 * by a factor of 10
660 */
661 max10 = roundv(pow_10(max));
662 fracpart = roundv(pow_10(max) * (ufvalue - intpart));
663
664 if (fracpart >= max10) {
665 intpart++;
666 fracpart -= max10;
667 }
668
669 /* convert integer part */
670 do {
671 iconvert[iplace++] = "0123456789"[intpart % 10];
672 intpart = (intpart / 10);
673 } while (intpart && (iplace < (int)sizeof(iconvert)));
674 if (iplace == sizeof(iconvert))
675 iplace--;
676 iconvert[iplace] = 0;
677
678 /* convert fractional part */
679 while (fplace < max) {
680 if (style == G_FORMAT && fplace == 0 && (fracpart % 10) == 0) {
681 /* We strip trailing zeros in G_FORMAT */
682 max--;
683 fracpart = fracpart / 10;
684 if (fplace < max)
685 continue;
686 break;
687 }
688 fconvert[fplace++] = "0123456789"[fracpart % 10];
689 fracpart = (fracpart / 10);
690 }
691
692 if (fplace == sizeof(fconvert))
693 fplace--;
694 fconvert[fplace] = 0;
695
696 /* convert exponent part */
697 if (realstyle == E_FORMAT) {
698 int tmpexp;
699 if (exp < 0)
700 tmpexp = -exp;
701 else
702 tmpexp = exp;
703
704 do {
705 econvert[eplace++] = "0123456789"[tmpexp % 10];
706 tmpexp = (tmpexp / 10);
707 } while (tmpexp > 0 && eplace < (int)sizeof(econvert));
708 /* Exponent is huge!! Too big to print */
709 if (tmpexp > 0) {
710 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
711 return 0;
712 }
713 /* Add a leading 0 for single digit exponents */
714 if (eplace == 1)
715 econvert[eplace++] = '0';
716 }
717
718 /*
719 * -1 for decimal point (if we have one, i.e. max > 0),
720 * another -1 if we are printing a sign
721 */
722 padlen = min - iplace - max - (max > 0 ? 1 : 0) - ((signvalue) ? 1 : 0);
723 /* Take some off for exponent prefix "+e" and exponent */
724 if (realstyle == E_FORMAT)
725 padlen -= 2 + eplace;
726 zpadlen = max - fplace;
727 if (zpadlen < 0)
728 zpadlen = 0;
729 if (padlen < 0)
730 padlen = 0;
731 if (flags & DP_F_MINUS)
732 padlen = -padlen;
733
734 if ((flags & DP_F_ZERO) && (padlen > 0)) {
735 if (signvalue) {
736 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue))
737 return 0;
738 --padlen;
739 signvalue = 0;
740 }
741 while (padlen > 0) {
742 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0'))
743 return 0;
744 --padlen;
745 }
746 }
747 while (padlen > 0) {
748 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
749 return 0;
750 --padlen;
751 }
752 if (signvalue && !doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue))
753 return 0;
754
755 while (iplace > 0) {
756 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]))
757 return 0;
758 }
759
760 /*
761 * Decimal point. This should probably use locale to find the correct
762 * char to print out.
763 */
764 if (max > 0 || (flags & DP_F_NUM)) {
765 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '.'))
766 return 0;
767
768 while (fplace > 0) {
769 if (!doapr_outch(sbuffer, buffer, currlen, maxlen,
770 fconvert[--fplace]))
771 return 0;
772 }
773 }
774 while (zpadlen > 0) {
775 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0'))
776 return 0;
777 --zpadlen;
778 }
779 if (realstyle == E_FORMAT) {
780 char ech;
781
782 if ((flags & DP_F_UP) == 0)
783 ech = 'e';
784 else
785 ech = 'E';
786 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ech))
787 return 0;
788 if (exp < 0) {
789 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '-'))
790 return 0;
791 } else {
792 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '+'))
793 return 0;
794 }
795 while (eplace > 0) {
796 if (!doapr_outch(sbuffer, buffer, currlen, maxlen,
797 econvert[--eplace]))
798 return 0;
799 }
800 }
801
802 while (padlen < 0) {
803 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
804 return 0;
805 ++padlen;
806 }
807 return 1;
808}
809
810#define BUFFER_INC 1024
811
812static int
813doapr_outch(char **sbuffer,
814 char **buffer, size_t *currlen, size_t *maxlen, int c)
815{
816 /* If we haven't at least one buffer, someone has done a big booboo */
817 if (!ossl_assert(*sbuffer != NULL || buffer != NULL))
818 return 0;
819
820 /* |currlen| must always be <= |*maxlen| */
821 if (!ossl_assert(*currlen <= *maxlen))
822 return 0;
823
824 if (buffer && *currlen == *maxlen) {
825 if (*maxlen > INT_MAX - BUFFER_INC)
826 return 0;
827
828 *maxlen += BUFFER_INC;
829 if (*buffer == NULL) {
830 if ((*buffer = OPENSSL_malloc(*maxlen)) == NULL) {
831 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
832 return 0;
833 }
834 if (*currlen > 0) {
835 if (!ossl_assert(*sbuffer != NULL))
836 return 0;
837 memcpy(*buffer, *sbuffer, *currlen);
838 }
839 *sbuffer = NULL;
840 } else {
841 char *tmpbuf;
842
843 tmpbuf = OPENSSL_realloc(*buffer, *maxlen);
844 if (tmpbuf == NULL) {
845 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
846 return 0;
847 }
848 *buffer = tmpbuf;
849 }
850 }
851
852 if (*currlen < *maxlen) {
853 if (*sbuffer)
854 (*sbuffer)[(*currlen)++] = (char)c;
855 else
856 (*buffer)[(*currlen)++] = (char)c;
857 }
858
859 return 1;
860}
861
862/***************************************************************************/
863
864int BIO_printf(BIO *bio, const char *format, ...)
865{
866 va_list args;
867 int ret;
868
869 va_start(args, format);
870
871 ret = BIO_vprintf(bio, format, args);
872
873 va_end(args);
874 return ret;
875}
876
877int BIO_vprintf(BIO *bio, const char *format, va_list args)
878{
879 int ret;
880 size_t retlen;
881 char hugebuf[1024 * 2]; /* Was previously 10k, which is unreasonable
882 * in small-stack environments, like threads
883 * or DOS programs. */
884 char *hugebufp = hugebuf;
885 size_t hugebufsize = sizeof(hugebuf);
886 char *dynbuf = NULL;
887 int ignored;
888
889 dynbuf = NULL;
890 if (!_dopr(&hugebufp, &dynbuf, &hugebufsize, &retlen, &ignored, format,
891 args)) {
892 OPENSSL_free(dynbuf);
893 return -1;
894 }
895 if (dynbuf) {
896 ret = BIO_write(bio, dynbuf, (int)retlen);
897 OPENSSL_free(dynbuf);
898 } else {
899 ret = BIO_write(bio, hugebuf, (int)retlen);
900 }
901 return ret;
902}
903
904/*
905 * As snprintf is not available everywhere, we provide our own
906 * implementation. This function has nothing to do with BIOs, but it's
907 * closely related to BIO_printf, and we need *some* name prefix ... (XXX the
908 * function should be renamed, but to what?)
909 */
910int BIO_snprintf(char *buf, size_t n, const char *format, ...)
911{
912 va_list args;
913 int ret;
914
915 va_start(args, format);
916
917 ret = BIO_vsnprintf(buf, n, format, args);
918
919 va_end(args);
920 return ret;
921}
922
923int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
924{
925 size_t retlen;
926 int truncated;
927
928 if (!_dopr(&buf, NULL, &n, &retlen, &truncated, format, args))
929 return -1;
930
931 if (truncated)
932 /*
933 * In case of truncation, return -1 like traditional snprintf.
934 * (Current drafts for ISO/IEC 9899 say snprintf should return the
935 * number of characters that would have been written, had the buffer
936 * been large enough.)
937 */
938 return -1;
939 return (retlen <= INT_MAX) ? (int)retlen : -1;
940}
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