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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+.    ds C` ""
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+.el\{\
+.    ds C`
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+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+.    if \nF \{\
+.        de IX
+.        tm Index:\\$1\t\\n%\t"\\$2"
+..
+.        if !\nF==2 \{\
+.            nr % 0
+.            nr F 2
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+.    \}
+.\}
+.rr rF
+.\"
+.\" Required to disable full justification in groff 1.23.0.
+.if n .ds AD l
+.\" ========================================================================
+.\"
+.IX Title "BIO_PRINTF 3ossl"
+.TH BIO_PRINTF 3ossl 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+BIO_printf, BIO_vprintf, BIO_snprintf, BIO_vsnprintf
+\&\- formatted output to a BIO
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bio.h>
+\&
+\& int BIO_printf(BIO *bio, const char *format, ...);
+\& int BIO_vprintf(BIO *bio, const char *format, va_list args);
+\&
+\& int BIO_snprintf(char *buf, size_t n, const char *format, ...);
+\& int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+\&\fBBIO_printf()\fR is similar to the standard C \fBprintf()\fR function, except that
+the output is sent to the specified BIO, \fIbio\fR, rather than standard
+output.  All common format specifiers are supported.
+.PP
+\&\fBBIO_vprintf()\fR is similar to the \fBvprintf()\fR function found on many platforms,
+the output is sent to the specified BIO, \fIbio\fR, rather than standard
+output.  All common format specifiers are supported. The argument
+list \fIargs\fR is a stdarg argument list.
+.PP
+\&\fBBIO_snprintf()\fR is for platforms that do not have the common \fBsnprintf()\fR
+function. It is like \fBsprintf()\fR except that the size parameter, \fIn\fR,
+specifies the size of the output buffer.
+.PP
+\&\fBBIO_vsnprintf()\fR is to \fBBIO_snprintf()\fR as \fBBIO_vprintf()\fR is to \fBBIO_printf()\fR.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+All functions return the number of bytes written, or \-1 on error.
+For \fBBIO_snprintf()\fR and \fBBIO_vsnprintf()\fR this includes when the output
+buffer is too small.
+.SH NOTES
+.IX Header "NOTES"
+Except when \fIn\fR is 0, both \fBBIO_snprintf()\fR and \fBBIO_vsnprintf()\fR always
+terminate their output with \f(CW\*(Aq\e0\*(Aq\fR.  This includes cases where \-1 is
+returned, such as when there is insufficient space to output the whole
+string.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2017\-2021 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+<https://www.openssl.org/source/license.html>.