1=pod 2 3=head1 NAME 4 5BIO_printf, BIO_vprintf, BIO_snprintf, BIO_vsnprintf 6- formatted output to a BIO 7 8=head1 SYNOPSIS 9 10 #include <openssl/bio.h> 11 12 int BIO_printf(BIO *bio, const char *format, ...); 13 int BIO_vprintf(BIO *bio, const char *format, va_list args); 14 15 int BIO_snprintf(char *buf, size_t n, const char *format, ...); 16 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args); 17 18=head1 DESCRIPTION 19 20BIO_printf() is similar to the standard C printf() function, except that 21the output is sent to the specified BIO, I<bio>, rather than standard 22output. All common format specifiers are supported. 23 24BIO_vprintf() is similar to the vprintf() function found on many platforms, 25the output is sent to the specified BIO, I<bio>, rather than standard 26output. All common format specifiers are supported. The argument 27list I<args> is a stdarg argument list. 28 29BIO_snprintf() is for platforms that do not have the common snprintf() 30function. It is like sprintf() except that the size parameter, I<n>, 31specifies the size of the output buffer. 32 33BIO_vsnprintf() is to BIO_snprintf() as BIO_vprintf() is to BIO_printf(). 34 35=head1 RETURN VALUES 36 37All functions return the number of bytes written, or -1 on error. 38For BIO_snprintf() and BIO_vsnprintf() this includes when the output 39buffer is too small. 40 41=head1 NOTES 42 43Except when I<n> is 0, both BIO_snprintf() and BIO_vsnprintf() always 44terminate their output with C<'\0'>. This includes cases where -1 is 45returned, such as when there is insufficient space to output the whole 46string. 47 48=head1 COPYRIGHT 49 50Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved. 51 52Licensed under the Apache License 2.0 (the "License"). You may not use 53this file except in compliance with the License. You can obtain a copy 54in the file LICENSE in the source distribution or at 55L<https://www.openssl.org/source/license.html>. 56 57=cut 58