// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#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 (out_len < 0) {

    return -1;

  }

  if ((size_t)out_len >= sizeof(buf)) {

    const size_t requested_len = (size_t)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 = reinterpret_cast<char *>(OPENSSL_malloc(requested_len + 1));

    out_malloced = 1;

    if (out == nullptr) {

      return -1;

    }

    va_start(args, format);

    out_len = vsnprintf(out, requested_len + 1, format, args);

    va_end(args);

    assert(out_len == (int)requested_len);

  } else {

    out = buf;

  }

  ret = BIO_write(bio, out, out_len);

  if (out_malloced) {

    OPENSSL_free(out);

  }

  return ret;

}