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Diffstat (limited to 'src/crypto/bio/printf.c')
-rw-r--r-- | src/crypto/bio/printf.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/crypto/bio/printf.c b/src/crypto/bio/printf.c new file mode 100644 index 0000000..3638915 --- /dev/null +++ b/src/crypto/bio/printf.c @@ -0,0 +1,115 @@ +/* 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/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 >= 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) { + /* Unclear what can be done in this situation. OpenSSL has historically + * crashed and that seems better than producing the wrong output. */ + abort(); + } + 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; +} |