BIO_printf, BIO_vprintf, BIO_snprintf, BIO_vsnprintf - formatted output to a BIO
#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);
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().
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.
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 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>.