2020-03-02 16:50:34 +00:00

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.\" ========================================================================
.\"
.IX Title "BIO_PRINTF 3"
.TH BIO_PRINTF 3 "2020-03-02" "3.0.0-dev" "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 Apache License 2.0 (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>.