1 /*
2 * Copyright 1995-2022 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 #include <openssl/configuration.h>
17
18 /*
19 * Copyright Patrick Powell 1995
20 * This code is based on code written by Patrick Powell <papowell@astart.com>
21 * It may be used for any purpose as long as this notice remains intact
22 * on all source code distributions.
23 */
24
25 #ifdef HAVE_LONG_DOUBLE
26 # define LDOUBLE long double
27 #else
28 # define LDOUBLE double
29 #endif
30
31 static int fmtstr(char **, char **, size_t *, size_t *,
32 const char *, int, int, int);
33 static int fmtint(char **, char **, size_t *, size_t *,
34 int64_t, int, int, int, int);
35 #ifndef OPENSSL_SYS_UEFI
36 static int fmtfp(char **, char **, size_t *, size_t *,
37 LDOUBLE, int, int, int, int);
38 #endif
39 static int doapr_outch(char **, char **, size_t *, size_t *, int);
40 static int _dopr(char **sbuffer, char **buffer,
41 size_t *maxlen, size_t *retlen, int *truncated,
42 const char *format, va_list args);
43
44 /* format read states */
45 #define DP_S_DEFAULT 0
46 #define DP_S_FLAGS 1
47 #define DP_S_MIN 2
48 #define DP_S_DOT 3
49 #define DP_S_MAX 4
50 #define DP_S_MOD 5
51 #define DP_S_CONV 6
52 #define DP_S_DONE 7
53
54 /* format flags - Bits */
55 /* left-aligned padding */
56 #define DP_F_MINUS (1 << 0)
57 /* print an explicit '+' for a value with positive sign */
58 #define DP_F_PLUS (1 << 1)
59 /* print an explicit ' ' for a value with positive sign */
60 #define DP_F_SPACE (1 << 2)
61 /* print 0/0x prefix for octal/hex and decimal point for floating point */
62 #define DP_F_NUM (1 << 3)
63 /* print leading zeroes */
64 #define DP_F_ZERO (1 << 4)
65 /* print HEX in UPPPERcase */
66 #define DP_F_UP (1 << 5)
67 /* treat value as unsigned */
68 #define DP_F_UNSIGNED (1 << 6)
69
70 /* conversion flags */
71 #define DP_C_SHORT 1
72 #define DP_C_LONG 2
73 #define DP_C_LDOUBLE 3
74 #define DP_C_LLONG 4
75 #define DP_C_SIZE 5
76
77 /* Floating point formats */
78 #define F_FORMAT 0
79 #define E_FORMAT 1
80 #define G_FORMAT 2
81
82 /* some handy macros */
83 #define char_to_int(p) (p - '0')
84 #define OSSL_MAX(p,q) ((p >= q) ? p : q)
85
86 static int
_dopr(char ** sbuffer,char ** buffer,size_t * maxlen,size_t * retlen,int * truncated,const char * format,va_list args)87 _dopr(char **sbuffer,
88 char **buffer,
89 size_t *maxlen,
90 size_t *retlen, int *truncated, const char *format, va_list args)
91 {
92 char ch;
93 int64_t value;
94 #ifndef OPENSSL_SYS_UEFI
95 LDOUBLE fvalue;
96 #endif
97 char *strvalue;
98 int min;
99 int max;
100 int state;
101 int flags;
102 int cflags;
103 size_t currlen;
104
105 state = DP_S_DEFAULT;
106 flags = currlen = cflags = min = 0;
107 max = -1;
108 ch = *format++;
109
110 while (state != DP_S_DONE) {
111 if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
112 state = DP_S_DONE;
113
114 switch (state) {
115 case DP_S_DEFAULT:
116 if (ch == '%')
117 state = DP_S_FLAGS;
118 else
119 if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, ch))
120 return 0;
121 ch = *format++;
122 break;
123 case DP_S_FLAGS:
124 switch (ch) {
125 case '-':
126 flags |= DP_F_MINUS;
127 ch = *format++;
128 break;
129 case '+':
130 flags |= DP_F_PLUS;
131 ch = *format++;
132 break;
133 case ' ':
134 flags |= DP_F_SPACE;
135 ch = *format++;
136 break;
137 case '#':
138 flags |= DP_F_NUM;
139 ch = *format++;
140 break;
141 case '0':
142 flags |= DP_F_ZERO;
143 ch = *format++;
144 break;
145 default:
146 state = DP_S_MIN;
147 break;
148 }
149 break;
150 case DP_S_MIN:
151 if (ossl_isdigit(ch)) {
152 min = 10 * min + char_to_int(ch);
153 ch = *format++;
154 } else if (ch == '*') {
155 min = va_arg(args, int);
156 ch = *format++;
157 state = DP_S_DOT;
158 } else
159 state = DP_S_DOT;
160 break;
161 case DP_S_DOT:
162 if (ch == '.') {
163 state = DP_S_MAX;
164 ch = *format++;
165 } else
166 state = DP_S_MOD;
167 break;
168 case DP_S_MAX:
169 if (ossl_isdigit(ch)) {
170 if (max < 0)
171 max = 0;
172 max = 10 * max + char_to_int(ch);
173 ch = *format++;
174 } else if (ch == '*') {
175 max = va_arg(args, int);
176 ch = *format++;
177 state = DP_S_MOD;
178 } else
179 state = DP_S_MOD;
180 break;
181 case DP_S_MOD:
182 switch (ch) {
183 case 'h':
184 cflags = DP_C_SHORT;
185 ch = *format++;
186 break;
187 case 'l':
188 if (*format == 'l') {
189 cflags = DP_C_LLONG;
190 format++;
191 } else
192 cflags = DP_C_LONG;
193 ch = *format++;
194 break;
195 case 'q':
196 case 'j':
197 cflags = DP_C_LLONG;
198 ch = *format++;
199 break;
200 case 'L':
201 cflags = DP_C_LDOUBLE;
202 ch = *format++;
203 break;
204 case 'z':
205 cflags = DP_C_SIZE;
206 ch = *format++;
207 break;
208 default:
209 break;
210 }
211 state = DP_S_CONV;
212 break;
213 case DP_S_CONV:
214 switch (ch) {
215 case 'd':
216 case 'i':
217 switch (cflags) {
218 case DP_C_SHORT:
219 value = (short int)va_arg(args, int);
220 break;
221 case DP_C_LONG:
222 value = va_arg(args, long int);
223 break;
224 case DP_C_LLONG:
225 value = va_arg(args, int64_t);
226 break;
227 case DP_C_SIZE:
228 value = va_arg(args, ossl_ssize_t);
229 break;
230 default:
231 value = va_arg(args, int);
232 break;
233 }
234 if (!fmtint(sbuffer, buffer, &currlen, maxlen, value, 10, min,
235 max, flags))
236 return 0;
237 break;
238 case 'X':
239 flags |= DP_F_UP;
240 /* FALLTHROUGH */
241 case 'x':
242 case 'o':
243 case 'u':
244 flags |= DP_F_UNSIGNED;
245 switch (cflags) {
246 case DP_C_SHORT:
247 value = (unsigned short int)va_arg(args, unsigned int);
248 break;
249 case DP_C_LONG:
250 value = va_arg(args, unsigned long int);
251 break;
252 case DP_C_LLONG:
253 value = va_arg(args, uint64_t);
254 break;
255 case DP_C_SIZE:
256 value = va_arg(args, size_t);
257 break;
258 default:
259 value = va_arg(args, unsigned int);
260 break;
261 }
262 if (!fmtint(sbuffer, buffer, &currlen, maxlen, value,
263 ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
264 min, max, flags))
265 return 0;
266 break;
267 #ifndef OPENSSL_SYS_UEFI
268 case 'f':
269 if (cflags == DP_C_LDOUBLE)
270 fvalue = va_arg(args, LDOUBLE);
271 else
272 fvalue = va_arg(args, double);
273 if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max,
274 flags, F_FORMAT))
275 return 0;
276 break;
277 case 'E':
278 flags |= DP_F_UP;
279 /* fall thru */
280 case 'e':
281 if (cflags == DP_C_LDOUBLE)
282 fvalue = va_arg(args, LDOUBLE);
283 else
284 fvalue = va_arg(args, double);
285 if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max,
286 flags, E_FORMAT))
287 return 0;
288 break;
289 case 'G':
290 flags |= DP_F_UP;
291 /* fall thru */
292 case 'g':
293 if (cflags == DP_C_LDOUBLE)
294 fvalue = va_arg(args, LDOUBLE);
295 else
296 fvalue = va_arg(args, double);
297 if (!fmtfp(sbuffer, buffer, &currlen, maxlen, fvalue, min, max,
298 flags, G_FORMAT))
299 return 0;
300 break;
301 #else
302 case 'f':
303 case 'E':
304 case 'e':
305 case 'G':
306 case 'g':
307 /* not implemented for UEFI */
308 ERR_raise(ERR_LIB_BIO, ERR_R_UNSUPPORTED);
309 return 0;
310 #endif
311 case 'c':
312 if (!doapr_outch(sbuffer, buffer, &currlen, maxlen,
313 va_arg(args, int)))
314 return 0;
315 break;
316 case 's':
317 strvalue = va_arg(args, char *);
318 if (max < 0) {
319 if (buffer)
320 max = INT_MAX;
321 else
322 max = *maxlen;
323 }
324 if (!fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
325 flags, min, max))
326 return 0;
327 break;
328 case 'p':
329 value = (size_t)va_arg(args, void *);
330 if (!fmtint(sbuffer, buffer, &currlen, maxlen,
331 value, 16, min, max, flags | DP_F_NUM))
332 return 0;
333 break;
334 case 'n':
335 {
336 int *num;
337 num = va_arg(args, int *);
338 *num = currlen;
339 }
340 break;
341 case '%':
342 if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, ch))
343 return 0;
344 break;
345 case 'w':
346 /* not supported yet, treat as next char */
347 format++;
348 break;
349 default:
350 /* unknown, skip */
351 break;
352 }
353 ch = *format++;
354 state = DP_S_DEFAULT;
355 flags = cflags = min = 0;
356 max = -1;
357 break;
358 case DP_S_DONE:
359 break;
360 default:
361 break;
362 }
363 }
364 /*
365 * We have to truncate if there is no dynamic buffer and we have filled the
366 * static buffer.
367 */
368 if (buffer == NULL) {
369 *truncated = (currlen > *maxlen - 1);
370 if (*truncated)
371 currlen = *maxlen - 1;
372 }
373 if (!doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0'))
374 return 0;
375 *retlen = currlen - 1;
376 return 1;
377 }
378
379 static int
fmtstr(char ** sbuffer,char ** buffer,size_t * currlen,size_t * maxlen,const char * value,int flags,int min,int max)380 fmtstr(char **sbuffer,
381 char **buffer,
382 size_t *currlen,
383 size_t *maxlen, const char *value, int flags, int min, int max)
384 {
385 int padlen;
386 size_t strln;
387 int cnt = 0;
388
389 if (value == 0)
390 value = "<NULL>";
391
392 strln = OPENSSL_strnlen(value, max < 0 ? SIZE_MAX : (size_t)max);
393
394 padlen = min - strln;
395 if (min < 0 || padlen < 0)
396 padlen = 0;
397 if (max >= 0) {
398 /*
399 * Calculate the maximum output including padding.
400 * Make sure max doesn't overflow into negativity
401 */
402 if (max < INT_MAX - padlen)
403 max += padlen;
404 else
405 max = INT_MAX;
406 }
407 if (flags & DP_F_MINUS)
408 padlen = -padlen;
409
410 while ((padlen > 0) && (max < 0 || cnt < max)) {
411 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
412 return 0;
413 --padlen;
414 ++cnt;
415 }
416 while (strln > 0 && (max < 0 || cnt < max)) {
417 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, *value++))
418 return 0;
419 --strln;
420 ++cnt;
421 }
422 while ((padlen < 0) && (max < 0 || cnt < max)) {
423 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
424 return 0;
425 ++padlen;
426 ++cnt;
427 }
428 return 1;
429 }
430
431 static int
fmtint(char ** sbuffer,char ** buffer,size_t * currlen,size_t * maxlen,int64_t value,int base,int min,int max,int flags)432 fmtint(char **sbuffer,
433 char **buffer,
434 size_t *currlen,
435 size_t *maxlen, int64_t value, int base, int min, int max, int flags)
436 {
437 int signvalue = 0;
438 const char *prefix = "";
439 uint64_t uvalue;
440 char convert[DECIMAL_SIZE(value) + 3];
441 int place = 0;
442 int spadlen = 0;
443 int zpadlen = 0;
444 int caps = 0;
445
446 if (max < 0)
447 max = 0;
448 uvalue = value;
449 if (!(flags & DP_F_UNSIGNED)) {
450 if (value < 0) {
451 signvalue = '-';
452 uvalue = 0 - (uint64_t)value;
453 } else if (flags & DP_F_PLUS)
454 signvalue = '+';
455 else if (flags & DP_F_SPACE)
456 signvalue = ' ';
457 }
458 if (flags & DP_F_NUM) {
459 if (base == 8)
460 prefix = "0";
461 if (base == 16)
462 prefix = "0x";
463 }
464 if (flags & DP_F_UP)
465 caps = 1;
466 do {
467 convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
468 [uvalue % (unsigned)base];
469 uvalue = (uvalue / (unsigned)base);
470 } while (uvalue && (place < (int)sizeof(convert)));
471 if (place == sizeof(convert))
472 place--;
473 convert[place] = 0;
474
475 zpadlen = max - place;
476 spadlen =
477 min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix);
478 if (zpadlen < 0)
479 zpadlen = 0;
480 if (spadlen < 0)
481 spadlen = 0;
482 if (flags & DP_F_ZERO) {
483 zpadlen = OSSL_MAX(zpadlen, spadlen);
484 spadlen = 0;
485 }
486 if (flags & DP_F_MINUS)
487 spadlen = -spadlen;
488
489 /* spaces */
490 while (spadlen > 0) {
491 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
492 return 0;
493 --spadlen;
494 }
495
496 /* sign */
497 if (signvalue)
498 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue))
499 return 0;
500
501 /* prefix */
502 while (*prefix) {
503 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix))
504 return 0;
505 prefix++;
506 }
507
508 /* zeros */
509 if (zpadlen > 0) {
510 while (zpadlen > 0) {
511 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0'))
512 return 0;
513 --zpadlen;
514 }
515 }
516 /* digits */
517 while (place > 0) {
518 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]))
519 return 0;
520 }
521
522 /* left justified spaces */
523 while (spadlen < 0) {
524 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
525 return 0;
526 ++spadlen;
527 }
528 return 1;
529 }
530
531 #ifndef OPENSSL_SYS_UEFI
532
abs_val(LDOUBLE value)533 static LDOUBLE abs_val(LDOUBLE value)
534 {
535 LDOUBLE result = value;
536 if (value < 0)
537 result = -value;
538 return result;
539 }
540
pow_10(int in_exp)541 static LDOUBLE pow_10(int in_exp)
542 {
543 LDOUBLE result = 1;
544 while (in_exp) {
545 result *= 10;
546 in_exp--;
547 }
548 return result;
549 }
550
roundv(LDOUBLE value)551 static long roundv(LDOUBLE value)
552 {
553 long intpart;
554 intpart = (long)value;
555 value = value - intpart;
556 if (value >= 0.5)
557 intpart++;
558 return intpart;
559 }
560
561 static int
fmtfp(char ** sbuffer,char ** buffer,size_t * currlen,size_t * maxlen,LDOUBLE fvalue,int min,int max,int flags,int style)562 fmtfp(char **sbuffer,
563 char **buffer,
564 size_t *currlen,
565 size_t *maxlen, LDOUBLE fvalue, int min, int max, int flags, int style)
566 {
567 int signvalue = 0;
568 LDOUBLE ufvalue;
569 LDOUBLE tmpvalue;
570 char iconvert[20];
571 char fconvert[20];
572 char econvert[20];
573 int iplace = 0;
574 int fplace = 0;
575 int eplace = 0;
576 int padlen = 0;
577 int zpadlen = 0;
578 long exp = 0;
579 unsigned long intpart;
580 unsigned long fracpart;
581 unsigned long max10;
582 int realstyle;
583
584 if (max < 0)
585 max = 6;
586
587 if (fvalue < 0)
588 signvalue = '-';
589 else if (flags & DP_F_PLUS)
590 signvalue = '+';
591 else if (flags & DP_F_SPACE)
592 signvalue = ' ';
593
594 /*
595 * G_FORMAT sometimes prints like E_FORMAT and sometimes like F_FORMAT
596 * depending on the number to be printed. Work out which one it is and use
597 * that from here on.
598 */
599 if (style == G_FORMAT) {
600 if (fvalue == 0.0) {
601 realstyle = F_FORMAT;
602 } else if (fvalue < 0.0001) {
603 realstyle = E_FORMAT;
604 } else if ((max == 0 && fvalue >= 10)
605 || (max > 0 && fvalue >= pow_10(max))) {
606 realstyle = E_FORMAT;
607 } else {
608 realstyle = F_FORMAT;
609 }
610 } else {
611 realstyle = style;
612 }
613
614 if (style != F_FORMAT) {
615 tmpvalue = fvalue;
616 /* Calculate the exponent */
617 if (fvalue != 0.0) {
618 while (tmpvalue < 1) {
619 tmpvalue *= 10;
620 exp--;
621 }
622 while (tmpvalue > 10) {
623 tmpvalue /= 10;
624 exp++;
625 }
626 }
627 if (style == G_FORMAT) {
628 /*
629 * In G_FORMAT the "precision" represents significant digits. We
630 * always have at least 1 significant digit.
631 */
632 if (max == 0)
633 max = 1;
634 /* Now convert significant digits to decimal places */
635 if (realstyle == F_FORMAT) {
636 max -= (exp + 1);
637 if (max < 0) {
638 /*
639 * Should not happen. If we're in F_FORMAT then exp < max?
640 */
641 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
642 return 0;
643 }
644 } else {
645 /*
646 * In E_FORMAT there is always one significant digit in front
647 * of the decimal point, so:
648 * significant digits == 1 + decimal places
649 */
650 max--;
651 }
652 }
653 if (realstyle == E_FORMAT)
654 fvalue = tmpvalue;
655 }
656 ufvalue = abs_val(fvalue);
657 /*
658 * By subtracting 65535 (2^16-1) we cancel the low order 15 bits
659 * of ULONG_MAX to avoid using imprecise floating point values.
660 */
661 if (ufvalue >= (double)(ULONG_MAX - 65535) + 65536.0) {
662 /* Number too big */
663 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
664 return 0;
665 }
666 intpart = (unsigned long)ufvalue;
667
668 /*
669 * sorry, we only support 9 digits past the decimal because of our
670 * conversion method
671 */
672 if (max > 9)
673 max = 9;
674
675 /*
676 * we "cheat" by converting the fractional part to integer by multiplying
677 * by a factor of 10
678 */
679 max10 = roundv(pow_10(max));
680 fracpart = roundv(pow_10(max) * (ufvalue - intpart));
681
682 if (fracpart >= max10) {
683 intpart++;
684 fracpart -= max10;
685 }
686
687 /* convert integer part */
688 do {
689 iconvert[iplace++] = "0123456789"[intpart % 10];
690 intpart = (intpart / 10);
691 } while (intpart && (iplace < (int)sizeof(iconvert)));
692 if (iplace == sizeof(iconvert))
693 iplace--;
694 iconvert[iplace] = 0;
695
696 /* convert fractional part */
697 while (fplace < max) {
698 if (style == G_FORMAT && fplace == 0 && (fracpart % 10) == 0) {
699 /* We strip trailing zeros in G_FORMAT */
700 max--;
701 fracpart = fracpart / 10;
702 if (fplace < max)
703 continue;
704 break;
705 }
706 fconvert[fplace++] = "0123456789"[fracpart % 10];
707 fracpart = (fracpart / 10);
708 }
709
710 if (fplace == sizeof(fconvert))
711 fplace--;
712 fconvert[fplace] = 0;
713
714 /* convert exponent part */
715 if (realstyle == E_FORMAT) {
716 int tmpexp;
717 if (exp < 0)
718 tmpexp = -exp;
719 else
720 tmpexp = exp;
721
722 do {
723 econvert[eplace++] = "0123456789"[tmpexp % 10];
724 tmpexp = (tmpexp / 10);
725 } while (tmpexp > 0 && eplace < (int)sizeof(econvert));
726 /* Exponent is huge!! Too big to print */
727 if (tmpexp > 0) {
728 (void)doapr_outch(sbuffer, buffer, currlen, maxlen, '\0');
729 return 0;
730 }
731 /* Add a leading 0 for single digit exponents */
732 if (eplace == 1)
733 econvert[eplace++] = '0';
734 }
735
736 /*
737 * -1 for decimal point (if we have one, i.e. max > 0),
738 * another -1 if we are printing a sign
739 */
740 padlen = min - iplace - max - (max > 0 ? 1 : 0) - ((signvalue) ? 1 : 0);
741 /* Take some off for exponent prefix "+e" and exponent */
742 if (realstyle == E_FORMAT)
743 padlen -= 2 + eplace;
744 zpadlen = max - fplace;
745 if (zpadlen < 0)
746 zpadlen = 0;
747 if (padlen < 0)
748 padlen = 0;
749 if (flags & DP_F_MINUS)
750 padlen = -padlen;
751
752 if ((flags & DP_F_ZERO) && (padlen > 0)) {
753 if (signvalue) {
754 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue))
755 return 0;
756 --padlen;
757 signvalue = 0;
758 }
759 while (padlen > 0) {
760 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0'))
761 return 0;
762 --padlen;
763 }
764 }
765 while (padlen > 0) {
766 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
767 return 0;
768 --padlen;
769 }
770 if (signvalue && !doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue))
771 return 0;
772
773 while (iplace > 0) {
774 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]))
775 return 0;
776 }
777
778 /*
779 * Decimal point. This should probably use locale to find the correct
780 * char to print out.
781 */
782 if (max > 0 || (flags & DP_F_NUM)) {
783 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '.'))
784 return 0;
785
786 while (fplace > 0) {
787 if (!doapr_outch(sbuffer, buffer, currlen, maxlen,
788 fconvert[--fplace]))
789 return 0;
790 }
791 }
792 while (zpadlen > 0) {
793 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '0'))
794 return 0;
795 --zpadlen;
796 }
797 if (realstyle == E_FORMAT) {
798 char ech;
799
800 if ((flags & DP_F_UP) == 0)
801 ech = 'e';
802 else
803 ech = 'E';
804 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ech))
805 return 0;
806 if (exp < 0) {
807 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '-'))
808 return 0;
809 } else {
810 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, '+'))
811 return 0;
812 }
813 while (eplace > 0) {
814 if (!doapr_outch(sbuffer, buffer, currlen, maxlen,
815 econvert[--eplace]))
816 return 0;
817 }
818 }
819
820 while (padlen < 0) {
821 if (!doapr_outch(sbuffer, buffer, currlen, maxlen, ' '))
822 return 0;
823 ++padlen;
824 }
825 return 1;
826 }
827
828 #endif /* OPENSSL_SYS_UEFI */
829
830 #define BUFFER_INC 1024
831
832 static int
doapr_outch(char ** sbuffer,char ** buffer,size_t * currlen,size_t * maxlen,int c)833 doapr_outch(char **sbuffer,
834 char **buffer, size_t *currlen, size_t *maxlen, int c)
835 {
836 /* If we haven't at least one buffer, someone has done a big booboo */
837 if (!ossl_assert(*sbuffer != NULL || buffer != NULL))
838 return 0;
839
840 /* |currlen| must always be <= |*maxlen| */
841 if (!ossl_assert(*currlen <= *maxlen))
842 return 0;
843
844 if (buffer && *currlen == *maxlen) {
845 if (*maxlen > INT_MAX - BUFFER_INC)
846 return 0;
847
848 *maxlen += BUFFER_INC;
849 if (*buffer == NULL) {
850 if ((*buffer = OPENSSL_malloc(*maxlen)) == NULL) {
851 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
852 return 0;
853 }
854 if (*currlen > 0) {
855 if (!ossl_assert(*sbuffer != NULL))
856 return 0;
857 memcpy(*buffer, *sbuffer, *currlen);
858 }
859 *sbuffer = NULL;
860 } else {
861 char *tmpbuf;
862
863 tmpbuf = OPENSSL_realloc(*buffer, *maxlen);
864 if (tmpbuf == NULL) {
865 ERR_raise(ERR_LIB_BIO, ERR_R_MALLOC_FAILURE);
866 return 0;
867 }
868 *buffer = tmpbuf;
869 }
870 }
871
872 if (*currlen < *maxlen) {
873 if (*sbuffer)
874 (*sbuffer)[(*currlen)++] = (char)c;
875 else
876 (*buffer)[(*currlen)++] = (char)c;
877 }
878
879 return 1;
880 }
881
882 /***************************************************************************/
883
BIO_printf(BIO * bio,const char * format,...)884 int BIO_printf(BIO *bio, const char *format, ...)
885 {
886 va_list args;
887 int ret;
888
889 va_start(args, format);
890
891 ret = BIO_vprintf(bio, format, args);
892
893 va_end(args);
894 return ret;
895 }
896
BIO_vprintf(BIO * bio,const char * format,va_list args)897 int BIO_vprintf(BIO *bio, const char *format, va_list args)
898 {
899 int ret;
900 size_t retlen;
901 char hugebuf[1024 * 2]; /* Was previously 10k, which is unreasonable
902 * in small-stack environments, like threads
903 * or DOS programs. */
904 char *hugebufp = hugebuf;
905 size_t hugebufsize = sizeof(hugebuf);
906 char *dynbuf = NULL;
907 int ignored;
908
909 dynbuf = NULL;
910 if (!_dopr(&hugebufp, &dynbuf, &hugebufsize, &retlen, &ignored, format,
911 args)) {
912 OPENSSL_free(dynbuf);
913 return -1;
914 }
915 if (dynbuf) {
916 ret = BIO_write(bio, dynbuf, (int)retlen);
917 OPENSSL_free(dynbuf);
918 } else {
919 ret = BIO_write(bio, hugebuf, (int)retlen);
920 }
921 return ret;
922 }
923
924 /*
925 * As snprintf is not available everywhere, we provide our own
926 * implementation. This function has nothing to do with BIOs, but it's
927 * closely related to BIO_printf, and we need *some* name prefix ... (XXX the
928 * function should be renamed, but to what?)
929 */
BIO_snprintf(char * buf,size_t n,const char * format,...)930 int BIO_snprintf(char *buf, size_t n, const char *format, ...)
931 {
932 va_list args;
933 int ret;
934
935 va_start(args, format);
936
937 ret = BIO_vsnprintf(buf, n, format, args);
938
939 va_end(args);
940 return ret;
941 }
942
BIO_vsnprintf(char * buf,size_t n,const char * format,va_list args)943 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
944 {
945 size_t retlen;
946 int truncated;
947
948 if (!_dopr(&buf, NULL, &n, &retlen, &truncated, format, args))
949 return -1;
950
951 if (truncated)
952 /*
953 * In case of truncation, return -1 like traditional snprintf.
954 * (Current drafts for ISO/IEC 9899 say snprintf should return the
955 * number of characters that would have been written, had the buffer
956 * been large enough.)
957 */
958 return -1;
959 return (retlen <= INT_MAX) ? (int)retlen : -1;
960 }
961