1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#if !defined(_POSIX_C_SOURCE)
58#define _POSIX_C_SOURCE 201410L  /* for snprintf, vprintf etc */
59#endif
60
61#include <openssl/bio.h>
62
63#include <assert.h>
64#include <stdarg.h>
65#include <stdio.h>
66
67#include <openssl/err.h>
68#include <openssl/mem.h>
69
70int BIO_printf(BIO *bio, const char *format, ...) {
71  va_list args;
72  char buf[256], *out, out_malloced = 0;
73  int out_len, ret;
74
75  va_start(args, format);
76  out_len = vsnprintf(buf, sizeof(buf), format, args);
77  va_end(args);
78
79#if defined(OPENSSL_WINDOWS)
80  /* On Windows, vsnprintf returns -1 rather than the requested length on
81   * truncation */
82  if (out_len < 0) {
83    va_start(args, format);
84    out_len = _vscprintf(format, args);
85    va_end(args);
86    assert(out_len >= sizeof(buf));
87  }
88#endif
89
90  if (out_len < 0) {
91    return -1;
92  }
93
94  if ((size_t) out_len >= sizeof(buf)) {
95    const int requested_len = out_len;
96    /* The output was truncated. Note that vsnprintf's return value
97     * does not include a trailing NUL, but the buffer must be sized
98     * for it. */
99    out = OPENSSL_malloc(requested_len + 1);
100    out_malloced = 1;
101    if (out == NULL) {
102      OPENSSL_PUT_ERROR(BIO, ERR_R_MALLOC_FAILURE);
103      return -1;
104    }
105    va_start(args, format);
106    out_len = vsnprintf(out, requested_len + 1, format, args);
107    va_end(args);
108    assert(out_len == requested_len);
109  } else {
110    out = buf;
111  }
112
113  ret = BIO_write(bio, out, out_len);
114  if (out_malloced) {
115    OPENSSL_free(out);
116  }
117
118  return ret;
119}
120