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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/bio/b_print.c
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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
12 #include "internal/cryptlib.h"
13 #include "crypto/ctype.h"
14 #include "internal/numbers.h"
15 #include <openssl/bio.h>
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.
24 #ifdef HAVE_LONG_DOUBLE
25 # define LDOUBLE long double
27 # define LDOUBLE double
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
);
41 /* format read states */
42 #define DP_S_DEFAULT 0
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)
67 /* conversion flags */
70 #define DP_C_LDOUBLE 3
74 /* Floating point formats */
79 /* some handy macros */
80 #define char_to_int(p) (p - '0')
81 #define OSSL_MAX(p,q) ((p >= q) ? p : q)
87 size_t *retlen
, int *truncated
, const char *format
, va_list args
)
100 state
= DP_S_DEFAULT
;
101 flags
= currlen
= cflags
= min
= 0;
105 while (state
!= DP_S_DONE
) {
106 if (ch
== '\0' || (buffer
== NULL
&& currlen
>= *maxlen
))
114 if (!doapr_outch(sbuffer
, buffer
, &currlen
, maxlen
, ch
))
146 if (ossl_isdigit(ch
)) {
147 min
= 10 * min
+ char_to_int(ch
);
149 } else if (ch
== '*') {
150 min
= va_arg(args
, int);
164 if (ossl_isdigit(ch
)) {
167 max
= 10 * max
+ char_to_int(ch
);
169 } else if (ch
== '*') {
170 max
= va_arg(args
, int);
183 if (*format
== 'l') {
196 cflags
= DP_C_LDOUBLE
;
214 value
= (short int)va_arg(args
, int);
217 value
= va_arg(args
, long int);
220 value
= va_arg(args
, int64_t);
223 value
= va_arg(args
, ossl_ssize_t
);
226 value
= va_arg(args
, int);
229 if (!fmtint(sbuffer
, buffer
, &currlen
, maxlen
, value
, 10, min
,
239 flags
|= DP_F_UNSIGNED
;
242 value
= (unsigned short int)va_arg(args
, unsigned int);
245 value
= va_arg(args
, unsigned long int);
248 value
= va_arg(args
, uint64_t);
251 value
= va_arg(args
, size_t);
254 value
= va_arg(args
, unsigned int);
257 if (!fmtint(sbuffer
, buffer
, &currlen
, maxlen
, value
,
258 ch
== 'o' ? 8 : (ch
== 'u' ? 10 : 16),
263 if (cflags
== DP_C_LDOUBLE
)
264 fvalue
= va_arg(args
, LDOUBLE
);
266 fvalue
= va_arg(args
, double);
267 if (!fmtfp(sbuffer
, buffer
, &currlen
, maxlen
, fvalue
, min
, max
,
275 if (cflags
== DP_C_LDOUBLE
)
276 fvalue
= va_arg(args
, LDOUBLE
);
278 fvalue
= va_arg(args
, double);
279 if (!fmtfp(sbuffer
, buffer
, &currlen
, maxlen
, fvalue
, min
, max
,
287 if (cflags
== DP_C_LDOUBLE
)
288 fvalue
= va_arg(args
, LDOUBLE
);
290 fvalue
= va_arg(args
, double);
291 if (!fmtfp(sbuffer
, buffer
, &currlen
, maxlen
, fvalue
, min
, max
,
296 if (!doapr_outch(sbuffer
, buffer
, &currlen
, maxlen
,
301 strvalue
= va_arg(args
, char *);
308 if (!fmtstr(sbuffer
, buffer
, &currlen
, maxlen
, strvalue
,
313 value
= (size_t)va_arg(args
, void *);
314 if (!fmtint(sbuffer
, buffer
, &currlen
, maxlen
,
315 value
, 16, min
, max
, flags
| DP_F_NUM
))
321 num
= va_arg(args
, int *);
326 if (!doapr_outch(sbuffer
, buffer
, &currlen
, maxlen
, ch
))
330 /* not supported yet, treat as next char */
338 state
= DP_S_DEFAULT
;
339 flags
= cflags
= min
= 0;
349 * We have to truncate if there is no dynamic buffer and we have filled the
352 if (buffer
== NULL
) {
353 *truncated
= (currlen
> *maxlen
- 1);
355 currlen
= *maxlen
- 1;
357 if (!doapr_outch(sbuffer
, buffer
, &currlen
, maxlen
, '\0'))
359 *retlen
= currlen
- 1;
364 fmtstr(char **sbuffer
,
367 size_t *maxlen
, const char *value
, int flags
, int min
, int max
)
376 strln
= OPENSSL_strnlen(value
, max
< 0 ? SIZE_MAX
: (size_t)max
);
378 padlen
= min
- strln
;
379 if (min
< 0 || padlen
< 0)
383 * Calculate the maximum output including padding.
384 * Make sure max doesn't overflow into negativity
386 if (max
< INT_MAX
- padlen
)
391 if (flags
& DP_F_MINUS
)
394 while ((padlen
> 0) && (max
< 0 || cnt
< max
)) {
395 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
400 while (strln
> 0 && (max
< 0 || cnt
< max
)) {
401 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, *value
++))
406 while ((padlen
< 0) && (max
< 0 || cnt
< max
)) {
407 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
416 fmtint(char **sbuffer
,
419 size_t *maxlen
, int64_t value
, int base
, int min
, int max
, int flags
)
422 const char *prefix
= "";
424 char convert
[DECIMAL_SIZE(value
) + 3];
433 if (!(flags
& DP_F_UNSIGNED
)) {
436 uvalue
= 0 - (uint64_t)value
;
437 } else if (flags
& DP_F_PLUS
)
439 else if (flags
& DP_F_SPACE
)
442 if (flags
& DP_F_NUM
) {
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
))
459 zpadlen
= max
- place
;
461 min
- OSSL_MAX(max
, place
) - (signvalue
? 1 : 0) - strlen(prefix
);
466 if (flags
& DP_F_ZERO
) {
467 zpadlen
= OSSL_MAX(zpadlen
, spadlen
);
470 if (flags
& DP_F_MINUS
)
474 while (spadlen
> 0) {
475 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
482 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, signvalue
))
487 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, *prefix
))
494 while (zpadlen
> 0) {
495 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '0'))
502 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, convert
[--place
]))
506 /* left justified spaces */
507 while (spadlen
< 0) {
508 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
515 static LDOUBLE
abs_val(LDOUBLE value
)
517 LDOUBLE result
= value
;
523 static LDOUBLE
pow_10(int in_exp
)
533 static long roundv(LDOUBLE value
)
536 intpart
= (long)value
;
537 value
= value
- intpart
;
544 fmtfp(char **sbuffer
,
547 size_t *maxlen
, LDOUBLE fvalue
, int min
, int max
, int flags
, int style
)
561 unsigned long intpart
;
562 unsigned long fracpart
;
571 else if (flags
& DP_F_PLUS
)
573 else if (flags
& DP_F_SPACE
)
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
581 if (style
== G_FORMAT
) {
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
;
590 realstyle
= F_FORMAT
;
596 if (style
!= F_FORMAT
) {
598 /* Calculate the exponent */
600 while (tmpvalue
< 1) {
604 while (tmpvalue
> 10) {
609 if (style
== G_FORMAT
) {
611 * In G_FORMAT the "precision" represents significant digits. We
612 * always have at least 1 significant digit.
616 /* Now convert significant digits to decimal places */
617 if (realstyle
== F_FORMAT
) {
621 * Should not happen. If we're in F_FORMAT then exp < max?
627 * In E_FORMAT there is always one significant digit in front
628 * of the decimal point, so:
629 * significant digits == 1 + decimal places
634 if (realstyle
== E_FORMAT
)
637 ufvalue
= abs_val(fvalue
);
639 * By subtracting 65535 (2^16-1) we cancel the low order 15 bits
640 * of ULONG_MAX to avoid using imprecise floating point values.
642 if (ufvalue
>= (double)(ULONG_MAX
- 65535) + 65536.0) {
646 intpart
= (unsigned long)ufvalue
;
649 * sorry, we only support 9 digits past the decimal because of our
656 * we "cheat" by converting the fractional part to integer by multiplying
659 max10
= roundv(pow_10(max
));
660 fracpart
= roundv(pow_10(max
) * (ufvalue
- intpart
));
662 if (fracpart
>= max10
) {
667 /* convert integer part */
669 iconvert
[iplace
++] = "0123456789"[intpart
% 10];
670 intpart
= (intpart
/ 10);
671 } while (intpart
&& (iplace
< (int)sizeof(iconvert
)));
672 if (iplace
== sizeof(iconvert
))
674 iconvert
[iplace
] = 0;
676 /* convert fractional part */
677 while (fplace
< max
) {
678 if (style
== G_FORMAT
&& fplace
== 0 && (fracpart
% 10) == 0) {
679 /* We strip trailing zeros in G_FORMAT */
681 fracpart
= fracpart
/ 10;
686 fconvert
[fplace
++] = "0123456789"[fracpart
% 10];
687 fracpart
= (fracpart
/ 10);
690 if (fplace
== sizeof(fconvert
))
692 fconvert
[fplace
] = 0;
694 /* convert exponent part */
695 if (realstyle
== E_FORMAT
) {
703 econvert
[eplace
++] = "0123456789"[tmpexp
% 10];
704 tmpexp
= (tmpexp
/ 10);
705 } while (tmpexp
> 0 && eplace
< (int)sizeof(econvert
));
706 /* Exponent is huge!! Too big to print */
709 /* Add a leading 0 for single digit exponents */
711 econvert
[eplace
++] = '0';
715 * -1 for decimal point (if we have one, i.e. max > 0),
716 * another -1 if we are printing a sign
718 padlen
= min
- iplace
- max
- (max
> 0 ? 1 : 0) - ((signvalue
) ? 1 : 0);
719 /* Take some off for exponent prefix "+e" and exponent */
720 if (realstyle
== E_FORMAT
)
721 padlen
-= 2 + eplace
;
722 zpadlen
= max
- fplace
;
727 if (flags
& DP_F_MINUS
)
730 if ((flags
& DP_F_ZERO
) && (padlen
> 0)) {
732 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, signvalue
))
738 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '0'))
744 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
748 if (signvalue
&& !doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, signvalue
))
752 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, iconvert
[--iplace
]))
757 * Decimal point. This should probably use locale to find the correct
760 if (max
> 0 || (flags
& DP_F_NUM
)) {
761 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '.'))
765 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
,
770 while (zpadlen
> 0) {
771 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '0'))
775 if (realstyle
== E_FORMAT
) {
778 if ((flags
& DP_F_UP
) == 0)
782 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ech
))
785 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '-'))
788 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, '+'))
792 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
,
799 if (!doapr_outch(sbuffer
, buffer
, currlen
, maxlen
, ' '))
806 #define BUFFER_INC 1024
809 doapr_outch(char **sbuffer
,
810 char **buffer
, size_t *currlen
, size_t *maxlen
, int c
)
812 /* If we haven't at least one buffer, someone has done a big booboo */
813 if (!ossl_assert(*sbuffer
!= NULL
|| buffer
!= NULL
))
816 /* |currlen| must always be <= |*maxlen| */
817 if (!ossl_assert(*currlen
<= *maxlen
))
820 if (buffer
&& *currlen
== *maxlen
) {
821 if (*maxlen
> INT_MAX
- BUFFER_INC
)
824 *maxlen
+= BUFFER_INC
;
825 if (*buffer
== NULL
) {
826 if ((*buffer
= OPENSSL_malloc(*maxlen
)) == NULL
) {
827 BIOerr(BIO_F_DOAPR_OUTCH
, ERR_R_MALLOC_FAILURE
);
831 if (!ossl_assert(*sbuffer
!= NULL
))
833 memcpy(*buffer
, *sbuffer
, *currlen
);
838 tmpbuf
= OPENSSL_realloc(*buffer
, *maxlen
);
845 if (*currlen
< *maxlen
) {
847 (*sbuffer
)[(*currlen
)++] = (char)c
;
849 (*buffer
)[(*currlen
)++] = (char)c
;
855 /***************************************************************************/
857 int BIO_printf(BIO
*bio
, const char *format
, ...)
862 va_start(args
, format
);
864 ret
= BIO_vprintf(bio
, format
, args
);
870 int BIO_vprintf(BIO
*bio
, const char *format
, va_list args
)
874 char hugebuf
[1024 * 2]; /* Was previously 10k, which is unreasonable
875 * in small-stack environments, like threads
876 * or DOS programs. */
877 char *hugebufp
= hugebuf
;
878 size_t hugebufsize
= sizeof(hugebuf
);
883 if (!_dopr(&hugebufp
, &dynbuf
, &hugebufsize
, &retlen
, &ignored
, format
,
885 OPENSSL_free(dynbuf
);
889 ret
= BIO_write(bio
, dynbuf
, (int)retlen
);
890 OPENSSL_free(dynbuf
);
892 ret
= BIO_write(bio
, hugebuf
, (int)retlen
);
898 * As snprintf is not available everywhere, we provide our own
899 * implementation. This function has nothing to do with BIOs, but it's
900 * closely related to BIO_printf, and we need *some* name prefix ... (XXX the
901 * function should be renamed, but to what?)
903 int BIO_snprintf(char *buf
, size_t n
, const char *format
, ...)
908 va_start(args
, format
);
910 ret
= BIO_vsnprintf(buf
, n
, format
, args
);
916 int BIO_vsnprintf(char *buf
, size_t n
, const char *format
, va_list args
)
921 if (!_dopr(&buf
, NULL
, &n
, &retlen
, &truncated
, format
, args
))
926 * In case of truncation, return -1 like traditional snprintf.
927 * (Current drafts for ISO/IEC 9899 say snprintf should return the
928 * number of characters that would have been written, had the buffer
929 * been large enough.)
933 return (retlen
<= INT_MAX
) ? (int)retlen
: -1;