1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #include <openssl/bio.h> 58 59 #include <assert.h> 60 #include <stdarg.h> 61 #include <stdio.h> 62 63 #include <openssl/err.h> 64 #include <openssl/mem.h> 65 66 int BIO_printf(BIO *bio, const char *format, ...) { 67 va_list args; 68 char buf[256], *out, out_malloced = 0; 69 int out_len, ret; 70 71 va_start(args, format); 72 out_len = vsnprintf(buf, sizeof(buf), format, args); 73 va_end(args); 74 75 #if defined(OPENSSL_WINDOWS) 76 // On Windows, vsnprintf returns -1 rather than the requested length on 77 // truncation 78 if (out_len < 0) { 79 va_start(args, format); 80 out_len = _vscprintf(format, args); 81 va_end(args); 82 assert(out_len >= (int)sizeof(buf)); 83 } 84 #endif 85 86 if (out_len < 0) { 87 return -1; 88 } 89 90 if ((size_t) out_len >= sizeof(buf)) { 91 const int requested_len = out_len; 92 // The output was truncated. Note that vsnprintf's return value 93 // does not include a trailing NUL, but the buffer must be sized 94 // for it. 95 out = OPENSSL_malloc(requested_len + 1); 96 out_malloced = 1; 97 if (out == NULL) { 98 OPENSSL_PUT_ERROR(BIO, ERR_R_MALLOC_FAILURE); 99 return -1; 100 } 101 va_start(args, format); 102 out_len = vsnprintf(out, requested_len + 1, format, args); 103 va_end(args); 104 assert(out_len == requested_len); 105 } else { 106 out = buf; 107 } 108 109 ret = BIO_write(bio, out, out_len); 110 if (out_malloced) { 111 OPENSSL_free(out); 112 } 113 114 return ret; 115 } 116
