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Title "BIO_PRINTF 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BIO_printf, BIO_vprintf, BIO_snprintf, BIO_vsnprintf \- formatted output to a BIO 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 Header "DESCRIPTION" \fBBIO_printf() is similar to the standard C printf() function, except that the output is sent to the specified \s-1BIO,\s0 bio, rather than standard output. All common format specifiers are supported.

\fBBIO_vprintf() is similar to the vprintf() function found on many platforms, the output is sent to the specified \s-1BIO,\s0 bio, rather than standard output. All common format specifiers are supported. The argument list args is a stdarg argument list.

\fBBIO_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.

\fBBIO_vsnprintf() is to BIO_snprintf() as BIO_vprintf() is to BIO_printf().

Header "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. Header "NOTES" Except when n is 0, both BIO_snprintf() and BIO_vsnprintf() always terminate their output with \*(Aq\e0\*(Aq. This includes cases where -1 is returned, such as when there is insufficient space to output the whole string. Header "COPYRIGHT" Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.

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>.