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- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #if !defined(_POSIX_C_SOURCE)
- #define _POSIX_C_SOURCE 201410L /* for snprintf, vprintf etc */
- #endif
-
- #include <openssl/bio.h>
-
- #include <assert.h>
- #include <stdarg.h>
- #include <stdio.h>
-
- #include <openssl/err.h>
- #include <openssl/mem.h>
-
- int BIO_printf(BIO *bio, const char *format, ...) {
- va_list args;
- char buf[256], *out, out_malloced = 0;
- int out_len, ret;
-
- va_start(args, format);
- out_len = vsnprintf(buf, sizeof(buf), format, args);
- va_end(args);
-
- #if defined(OPENSSL_WINDOWS)
- /* On Windows, vsnprintf returns -1 rather than the requested length on
- * truncation */
- if (out_len < 0) {
- va_start(args, format);
- out_len = _vscprintf(format, args);
- va_end(args);
- assert(out_len >= sizeof(buf));
- }
- #endif
-
- if (out_len < 0) {
- return -1;
- }
-
- if ((size_t) out_len >= sizeof(buf)) {
- const int requested_len = out_len;
- /* The output was truncated. Note that vsnprintf's return value
- * does not include a trailing NUL, but the buffer must be sized
- * for it. */
- out = OPENSSL_malloc(requested_len + 1);
- out_malloced = 1;
- if (out == NULL) {
- OPENSSL_PUT_ERROR(BIO, ERR_R_MALLOC_FAILURE);
- return -1;
- }
- va_start(args, format);
- out_len = vsnprintf(out, requested_len + 1, format, args);
- va_end(args);
- assert(out_len == requested_len);
- } else {
- out = buf;
- }
-
- ret = BIO_write(bio, out, out_len);
- if (out_malloced) {
- OPENSSL_free(out);
- }
-
- return ret;
- }
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