NAME

       BIO_printf, BIO_vprintf, BIO_snprintf, BIO_vsnprintf - formatted output to a BIO

SYNOPSIS

        #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);

DESCRIPTION

       BIO_printf() is similar to the standard C printf() function, except that the output is
       sent to the specified BIO, bio, rather than standard output.  All common format specifiers
       are supported.

       BIO_vprintf() is similar to the vprintf() function found on many platforms, the output is
       sent to the specified BIO, bio, rather than standard output.  All common format specifiers
       are supported. The argument list args is a stdarg argument list.

       BIO_snprintf() is for platforms that do not have the common snprintf() function. It is
       like sprintf() except that the size parameter, n, specifies the size of the output buffer.

       BIO_vsnprintf() is to BIO_snprintf() as BIO_vprintf() is to BIO_printf().

RETURN VALUES

       All functions return the number of bytes written, or -1 on error.  For BIO_snprintf() and
       BIO_vsnprintf() this includes when the output buffer is too small.

NOTES

       Except when n is 0, both BIO_snprintf() and BIO_vsnprintf() always terminate their output
       with '\0'.  This includes cases where -1 is returned, such as when there is insufficient
       space to output the whole string.

COPYRIGHT

       Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.

       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>.