1.\" $OpenBSD: BIO_printf.3,v 1.4 2024/03/02 09:18:28 tb Exp $ 2.\" OpenSSL 2ca2e917 Mon Mar 20 16:25:22 2017 -0400 3.\" 4.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org> 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd $Mdocdate: March 2 2024 $ 19.Dt BIO_PRINTF 3 20.Os 21.Sh NAME 22.Nm BIO_printf 23.Nd formatted output to a BIO 24.Sh SYNOPSIS 25.In openssl/bio.h 26.Ft int 27.Fo BIO_printf 28.Fa "BIO *bio" 29.Fa "const char *format" 30.Fa ... 31.Fc 32.Sh DESCRIPTION 33.Fn BIO_printf 34is a wrapper around 35.Xr vfprintf 3 , 36sending the output to the specified 37.Fa bio . 38.Sh RETURN VALUES 39These functions return the number of bytes written, 40or -1 if an error occurs. 41.Sh SEE ALSO 42.Xr BIO_new 3 43.Sh HISTORY 44.Fn BIO_printf 45first appeared in SSLeay 0.6.5 and has been available since 46.Ox 2.4 . 47