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.\" ========================================================================
.\"
.IX Title "BIO_PRINTF 3"
.TH BIO_PRINTF 3 "2023-09-11" "1.1.1w" "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"
\&\fIBIO_printf()\fR is similar to the standard C \fIprintf()\fR function, except that
the output is sent to the specified \s-1BIO, \s0\fBbio\fR, rather than standard
output.  All common format specifiers are supported.
.PP
\&\fIBIO_vprintf()\fR is similar to the \fIvprintf()\fR function found on many platforms,
the output is sent to the specified \s-1BIO, \s0\fBbio\fR, rather than standard
output.  All common format specifiers are supported. The argument
list \fBargs\fR is a stdarg argument list.
.PP
\&\fIBIO_snprintf()\fR is for platforms that do not have the common \fIsnprintf()\fR
function. It is like \fIsprintf()\fR except that the size parameter, \fBn\fR,
specifies the size of the output buffer.
.PP
\&\fIBIO_vsnprintf()\fR is to \fIBIO_snprintf()\fR as \fIBIO_vprintf()\fR is to \fIBIO_printf()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
All functions return the number of bytes written, or \-1 on error.
For \fIBIO_snprintf()\fR and \fIBIO_vsnprintf()\fR this includes when the output
buffer is too small.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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