include/openssl/err.h - boringssl - Git at Google

 /* 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.]
  */
 /* ====================================================================
  * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@openssl.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com). */

 #ifndef OPENSSL_HEADER_ERR_H
 #define OPENSSL_HEADER_ERR_H

 #include <stdio.h>

 #include <openssl/base.h>

 #if defined(__cplusplus)
 extern "C" {
 #endif


 // Error queue handling functions.
 //
 // Errors in OpenSSL are generally signaled by the return value of a function.
 // When a function fails it may add an entry to a per-thread error queue,
 // which is managed by the functions in this header.
 //
 // Each error contains:
 //   1) The library (i.e. ec, pem, rsa) which created it.
 //   2) The file and line number of the call that added the error.
 //   3) A pointer to some error specific data, which may be NULL.
 //
 // The library identifier and reason code are packed in a uint32_t and there
 // exist various functions for unpacking it.
 //
 // The typical behaviour is that an error will occur deep in a call queue and
 // that code will push an error onto the error queue. As the error queue
 // unwinds, other functions will push their own errors. Thus, the "least
 // recent" error is the most specific and the other errors will provide a
 // backtrace of sorts.


 // Startup and shutdown.

 // ERR_load_BIO_strings does nothing.
 //
 // TODO(fork): remove. libjingle calls this.
 OPENSSL_EXPORT void ERR_load_BIO_strings(void);

 // ERR_load_ERR_strings does nothing.
 OPENSSL_EXPORT void ERR_load_ERR_strings(void);

 // ERR_load_crypto_strings does nothing.
 OPENSSL_EXPORT void ERR_load_crypto_strings(void);

 // ERR_load_RAND_strings does nothing.
 OPENSSL_EXPORT void ERR_load_RAND_strings(void);

 // ERR_free_strings does nothing.
 OPENSSL_EXPORT void ERR_free_strings(void);


 // Reading and formatting errors.

 // ERR_GET_LIB returns the library code for the error. This is one of
 // the |ERR_LIB_*| values.
 #define ERR_GET_LIB(packed_error) ((int)(((packed_error) >> 24) & 0xff))

 // ERR_GET_REASON returns the reason code for the error. This is one of
 // library-specific |LIB_R_*| values where |LIB| is the library (see
 // |ERR_GET_LIB|). Note that reason codes are specific to the library.
 #define ERR_GET_REASON(packed_error) ((int)((packed_error) & 0xfff))

 // ERR_get_error gets the packed error code for the least recent error and
 // removes that error from the queue. If there are no errors in the queue then
 // it returns zero.
 OPENSSL_EXPORT uint32_t ERR_get_error(void);

 // ERR_get_error_line acts like |ERR_get_error|, except that the file and line
 // number of the call that added the error are also returned.
 OPENSSL_EXPORT uint32_t ERR_get_error_line(const char **file, int *line);

 // ERR_FLAG_STRING means that the |data| member is a NUL-terminated string that
 // can be printed. This is always set if |data| is non-NULL.
 #define ERR_FLAG_STRING 1

 // ERR_get_error_line_data acts like |ERR_get_error_line|, but also returns the
 // error-specific data pointer and flags. The flags are a bitwise-OR of
 // |ERR_FLAG_*| values. The error-specific data is owned by the error queue
 // and the pointer becomes invalid after the next call that affects the same
 // thread's error queue. If |*flags| contains |ERR_FLAG_STRING| then |*data| is
 // human-readable.
 OPENSSL_EXPORT uint32_t ERR_get_error_line_data(const char **file, int *line,
                                                 const char **data, int *flags);

 // The "peek" functions act like the |ERR_get_error| functions, above, but they
 // do not remove the error from the queue.
 OPENSSL_EXPORT uint32_t ERR_peek_error(void);
 OPENSSL_EXPORT uint32_t ERR_peek_error_line(const char **file, int *line);
 OPENSSL_EXPORT uint32_t ERR_peek_error_line_data(const char **file, int *line,
                                                  const char **data, int *flags);

 // The "peek last" functions act like the "peek" functions, above, except that
 // they return the most recent error.
 OPENSSL_EXPORT uint32_t ERR_peek_last_error(void);
 OPENSSL_EXPORT uint32_t ERR_peek_last_error_line(const char **file, int *line);
 OPENSSL_EXPORT uint32_t ERR_peek_last_error_line_data(const char **file,
                                                       int *line,
                                                       const char **data,
                                                       int *flags);

 // ERR_error_string_n generates a human-readable string representing
 // |packed_error| and places it at |buf|. It writes at most |len| bytes
 // (including the terminating NUL) and truncates the string if necessary. If
 // |len| is greater than zero then |buf| is always NUL terminated.
 //
 // The string will have the following format:
 //
 //   error:[error code]:[library name]:OPENSSL_internal:[reason string]
 //
 // error code is an 8 digit hexadecimal number; library name and reason string
 // are ASCII text.
 OPENSSL_EXPORT void ERR_error_string_n(uint32_t packed_error, char *buf,
                                        size_t len);

 // ERR_lib_error_string returns a string representation of the library that
 // generated |packed_error|.
 OPENSSL_EXPORT const char *ERR_lib_error_string(uint32_t packed_error);

 // ERR_reason_error_string returns a string representation of the reason for
 // |packed_error|.
 OPENSSL_EXPORT const char *ERR_reason_error_string(uint32_t packed_error);

 // ERR_print_errors_callback_t is the type of a function used by
 // |ERR_print_errors_cb|. It takes a pointer to a human readable string (and
 // its length) that describes an entry in the error queue. The |ctx| argument
 // is an opaque pointer given to |ERR_print_errors_cb|.
 //
 // It should return one on success or zero on error, which will stop the
 // iteration over the error queue.
 typedef int (*ERR_print_errors_callback_t)(const char *str, size_t len,
                                            void *ctx);

 // ERR_print_errors_cb clears the current thread's error queue, calling
 // |callback| with a string representation of each error, from the least recent
 // to the most recent error.
 //
 // The string will have the following format (which differs from
 // |ERR_error_string|):
 //
 //   [thread id]:error:[error code]:[library name]:OPENSSL_internal:[reason string]:[file]:[line number]:[optional string data]
 //
 // The callback can return one to continue the iteration or zero to stop it.
 // The |ctx| argument is an opaque value that is passed through to the
 // callback.
 OPENSSL_EXPORT void ERR_print_errors_cb(ERR_print_errors_callback_t callback,
                                         void *ctx);

 // ERR_print_errors_fp clears the current thread's error queue, printing each
 // error to |file|. See |ERR_print_errors_cb| for the format.
 OPENSSL_EXPORT void ERR_print_errors_fp(FILE *file);


 // Clearing errors.

 // ERR_clear_error clears the error queue for the current thread.
 OPENSSL_EXPORT void ERR_clear_error(void);

 // ERR_set_mark "marks" the most recent error for use with |ERR_pop_to_mark|.
 // It returns one if an error was marked and zero if there are no errors.
 OPENSSL_EXPORT int ERR_set_mark(void);

 // ERR_pop_to_mark removes errors from the most recent to the least recent
 // until (and not including) a "marked" error. It returns zero if no marked
 // error was found (and thus all errors were removed) and one otherwise. Errors
 // are marked using |ERR_set_mark|.
 OPENSSL_EXPORT int ERR_pop_to_mark(void);


 // Custom errors.

 // ERR_get_next_error_library returns a value suitable for passing as the
 // |library| argument to |ERR_put_error|. This is intended for code that wishes
 // to push its own, non-standard errors to the error queue.
 OPENSSL_EXPORT int ERR_get_next_error_library(void);


 // Built-in library and reason codes.

 // The following values are built-in library codes.
 enum {
   ERR_LIB_NONE = 1,
   ERR_LIB_SYS,
   ERR_LIB_BN,
   ERR_LIB_RSA,
   ERR_LIB_DH,
   ERR_LIB_EVP,
   ERR_LIB_BUF,
   ERR_LIB_OBJ,
   ERR_LIB_PEM,
   ERR_LIB_DSA,
   ERR_LIB_X509,
   ERR_LIB_ASN1,
   ERR_LIB_CONF,
   ERR_LIB_CRYPTO,
   ERR_LIB_EC,
   ERR_LIB_SSL,
   ERR_LIB_BIO,
   ERR_LIB_PKCS7,
   ERR_LIB_PKCS8,
   ERR_LIB_X509V3,
   ERR_LIB_RAND,
   ERR_LIB_ENGINE,
   ERR_LIB_OCSP,
   ERR_LIB_UI,
   ERR_LIB_COMP,
   ERR_LIB_ECDSA,
   ERR_LIB_ECDH,
   ERR_LIB_HMAC,
   ERR_LIB_DIGEST,
   ERR_LIB_CIPHER,
   ERR_LIB_HKDF,
   ERR_LIB_USER,
   ERR_NUM_LIBS
 };

 // The following reason codes used to denote an error occuring in another
 // library. They are sometimes used for a stack trace.
 #define ERR_R_SYS_LIB ERR_LIB_SYS
 #define ERR_R_BN_LIB ERR_LIB_BN
 #define ERR_R_RSA_LIB ERR_LIB_RSA
 #define ERR_R_DH_LIB ERR_LIB_DH
 #define ERR_R_EVP_LIB ERR_LIB_EVP
 #define ERR_R_BUF_LIB ERR_LIB_BUF
 #define ERR_R_OBJ_LIB ERR_LIB_OBJ
 #define ERR_R_PEM_LIB ERR_LIB_PEM
 #define ERR_R_DSA_LIB ERR_LIB_DSA
 #define ERR_R_X509_LIB ERR_LIB_X509
 #define ERR_R_ASN1_LIB ERR_LIB_ASN1
 #define ERR_R_CONF_LIB ERR_LIB_CONF
 #define ERR_R_CRYPTO_LIB ERR_LIB_CRYPTO
 #define ERR_R_EC_LIB ERR_LIB_EC
 #define ERR_R_SSL_LIB ERR_LIB_SSL
 #define ERR_R_BIO_LIB ERR_LIB_BIO
 #define ERR_R_PKCS7_LIB ERR_LIB_PKCS7
 #define ERR_R_PKCS8_LIB ERR_LIB_PKCS8
 #define ERR_R_X509V3_LIB ERR_LIB_X509V3
 #define ERR_R_RAND_LIB ERR_LIB_RAND
 #define ERR_R_DSO_LIB ERR_LIB_DSO
 #define ERR_R_ENGINE_LIB ERR_LIB_ENGINE
 #define ERR_R_OCSP_LIB ERR_LIB_OCSP
 #define ERR_R_UI_LIB ERR_LIB_UI
 #define ERR_R_COMP_LIB ERR_LIB_COMP
 #define ERR_R_ECDSA_LIB ERR_LIB_ECDSA
 #define ERR_R_ECDH_LIB ERR_LIB_ECDH
 #define ERR_R_STORE_LIB ERR_LIB_STORE
 #define ERR_R_FIPS_LIB ERR_LIB_FIPS
 #define ERR_R_CMS_LIB ERR_LIB_CMS
 #define ERR_R_TS_LIB ERR_LIB_TS
 #define ERR_R_HMAC_LIB ERR_LIB_HMAC
 #define ERR_R_JPAKE_LIB ERR_LIB_JPAKE
 #define ERR_R_USER_LIB ERR_LIB_USER
 #define ERR_R_DIGEST_LIB ERR_LIB_DIGEST
 #define ERR_R_CIPHER_LIB ERR_LIB_CIPHER
 #define ERR_R_HKDF_LIB ERR_LIB_HKDF

 // The following values are global reason codes. They may occur in any library.
 #define ERR_R_FATAL 64
 #define ERR_R_MALLOC_FAILURE (1 | ERR_R_FATAL)
 #define ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED (2 | ERR_R_FATAL)
 #define ERR_R_PASSED_NULL_PARAMETER (3 | ERR_R_FATAL)
 #define ERR_R_INTERNAL_ERROR (4 | ERR_R_FATAL)
 #define ERR_R_OVERFLOW (5 | ERR_R_FATAL)


 // Deprecated functions.

 // ERR_remove_state calls |ERR_clear_error|.
 OPENSSL_EXPORT void ERR_remove_state(unsigned long pid);

 // ERR_remove_thread_state clears the error queue for the current thread if
 // |tid| is NULL. Otherwise it calls |assert(0)|, because it's no longer
 // possible to delete the error queue for other threads.
 //
 // Use |ERR_clear_error| instead. Note error queues are deleted automatically on
 // thread exit. You do not need to call this function to release memory.
 OPENSSL_EXPORT void ERR_remove_thread_state(const CRYPTO_THREADID *tid);

 // ERR_func_error_string returns the string "OPENSSL_internal".
 OPENSSL_EXPORT const char *ERR_func_error_string(uint32_t packed_error);

 // ERR_error_string behaves like |ERR_error_string_n| but |len| is implicitly
 // |ERR_ERROR_STRING_BUF_LEN| and it returns |buf|. If |buf| is NULL, the error
 // string is placed in a static buffer which is returned. (The static buffer may
 // be overridden by concurrent calls in other threads so this form should not be
 // used.)
 //
 // Use |ERR_error_string_n| instead.
 //
 // TODO(fork): remove this function.
 OPENSSL_EXPORT char *ERR_error_string(uint32_t packed_error, char *buf);
 #define ERR_ERROR_STRING_BUF_LEN 120

 // ERR_GET_FUNC returns zero. BoringSSL errors do not report a function code.
 #define ERR_GET_FUNC(packed_error) 0

 // ERR_TXT_STRING is provided for compatibility with code that assumes that
 // it's using OpenSSL.
 #define ERR_TXT_STRING ERR_FLAG_STRING


 // Private functions.

 // ERR_clear_system_error clears the system's error value (i.e. errno).
 OPENSSL_EXPORT void ERR_clear_system_error(void);

 // OPENSSL_PUT_ERROR is used by OpenSSL code to add an error to the error
 // queue.
 #define OPENSSL_PUT_ERROR(library, reason) \
   ERR_put_error(ERR_LIB_##library, 0, reason, __FILE__, __LINE__)

 // OPENSSL_PUT_SYSTEM_ERROR is used by OpenSSL code to add an error from the
 // operating system to the error queue.
 // TODO(fork): include errno.
 #define OPENSSL_PUT_SYSTEM_ERROR() \
   ERR_put_error(ERR_LIB_SYS, 0, 0, __FILE__, __LINE__);

 // ERR_put_error adds an error to the error queue, dropping the least recent
 // error if necessary for space reasons.
 OPENSSL_EXPORT void ERR_put_error(int library, int unused, int reason,
                                   const char *file, unsigned line);

 // ERR_add_error_data takes a variable number (|count|) of const char*
 // pointers, concatenates them and sets the result as the data on the most
 // recent error.
 OPENSSL_EXPORT void ERR_add_error_data(unsigned count, ...);

 // ERR_add_error_dataf takes a printf-style format and arguments, and sets the
 // result as the data on the most recent error.
 OPENSSL_EXPORT void ERR_add_error_dataf(const char *format, ...)
     OPENSSL_PRINTF_FORMAT_FUNC(1, 2);

 // ERR_NUM_ERRORS is one more than the limit of the number of errors in the
 // queue.
 #define ERR_NUM_ERRORS 16

 #define ERR_PACK(lib, reason)                                              \
   (((((uint32_t)(lib)) & 0xff) << 24) | ((((uint32_t)(reason)) & 0xfff)))

 // OPENSSL_DECLARE_ERROR_REASON is used by util/make_errors.h (which generates
 // the error defines) to recognise that an additional reason value is needed.
 // This is needed when the reason value is used outside of an
 // |OPENSSL_PUT_ERROR| macro. The resulting define will be
 // ${lib}_R_${reason}.
 #define OPENSSL_DECLARE_ERROR_REASON(lib, reason)


 #if defined(__cplusplus)
 }  // extern C
 #endif

 #endif  // OPENSSL_HEADER_ERR_H
	/* 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.]
	*/
	/* ====================================================================
	* Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com). */

	#ifndef OPENSSL_HEADER_ERR_H
	#define OPENSSL_HEADER_ERR_H

	#include <stdio.h>

	#include <openssl/base.h>

	#if defined(__cplusplus)
	extern "C" {
	#endif


	// Error queue handling functions.
	//
	// Errors in OpenSSL are generally signaled by the return value of a function.
	// When a function fails it may add an entry to a per-thread error queue,
	// which is managed by the functions in this header.
	//
	// Each error contains:
	// 1) The library (i.e. ec, pem, rsa) which created it.
	// 2) The file and line number of the call that added the error.
	// 3) A pointer to some error specific data, which may be NULL.
	//
	// The library identifier and reason code are packed in a uint32_t and there
	// exist various functions for unpacking it.
	//
	// The typical behaviour is that an error will occur deep in a call queue and
	// that code will push an error onto the error queue. As the error queue
	// unwinds, other functions will push their own errors. Thus, the "least
	// recent" error is the most specific and the other errors will provide a
	// backtrace of sorts.


	// Startup and shutdown.

	// ERR_load_BIO_strings does nothing.
	//
	// TODO(fork): remove. libjingle calls this.
	OPENSSL_EXPORT void ERR_load_BIO_strings(void);

	// ERR_load_ERR_strings does nothing.
	OPENSSL_EXPORT void ERR_load_ERR_strings(void);

	// ERR_load_crypto_strings does nothing.
	OPENSSL_EXPORT void ERR_load_crypto_strings(void);

	// ERR_load_RAND_strings does nothing.
	OPENSSL_EXPORT void ERR_load_RAND_strings(void);

	// ERR_free_strings does nothing.
	OPENSSL_EXPORT void ERR_free_strings(void);


	// Reading and formatting errors.

	// ERR_GET_LIB returns the library code for the error. This is one of
	// the \|ERR_LIB_*\| values.
	#define ERR_GET_LIB(packed_error) ((int)(((packed_error) >> 24) & 0xff))

	// ERR_GET_REASON returns the reason code for the error. This is one of
	// library-specific \|LIB_R_*\| values where \|LIB\| is the library (see
	// \|ERR_GET_LIB\|). Note that reason codes are specific to the library.
	#define ERR_GET_REASON(packed_error) ((int)((packed_error) & 0xfff))

	// ERR_get_error gets the packed error code for the least recent error and
	// removes that error from the queue. If there are no errors in the queue then
	// it returns zero.
	OPENSSL_EXPORT uint32_t ERR_get_error(void);

	// ERR_get_error_line acts like \|ERR_get_error\|, except that the file and line
	// number of the call that added the error are also returned.
	OPENSSL_EXPORT uint32_t ERR_get_error_line(const char *file, int line);

	// ERR_FLAG_STRING means that the \|data\| member is a NUL-terminated string that
	// can be printed. This is always set if \|data\| is non-NULL.
	#define ERR_FLAG_STRING 1

	// ERR_get_error_line_data acts like \|ERR_get_error_line\|, but also returns the
	// error-specific data pointer and flags. The flags are a bitwise-OR of
	// \|ERR_FLAG_*\| values. The error-specific data is owned by the error queue
	// and the pointer becomes invalid after the next call that affects the same
	// thread's error queue. If \|flags\| contains \|ERR_FLAG_STRING\| then \|data\| is
	// human-readable.
	OPENSSL_EXPORT uint32_t ERR_get_error_line_data(const char *file, int line,
	const char *data, int flags);

	// The "peek" functions act like the \|ERR_get_error\| functions, above, but they
	// do not remove the error from the queue.
	OPENSSL_EXPORT uint32_t ERR_peek_error(void);
	OPENSSL_EXPORT uint32_t ERR_peek_error_line(const char *file, int line);
	OPENSSL_EXPORT uint32_t ERR_peek_error_line_data(const char *file, int line,
	const char *data, int flags);

	// The "peek last" functions act like the "peek" functions, above, except that
	// they return the most recent error.
	OPENSSL_EXPORT uint32_t ERR_peek_last_error(void);
	OPENSSL_EXPORT uint32_t ERR_peek_last_error_line(const char *file, int line);
	OPENSSL_EXPORT uint32_t ERR_peek_last_error_line_data(const char **file,
	int *line,
	const char **data,
	int *flags);

	// ERR_error_string_n generates a human-readable string representing
	// \|packed_error\| and places it at \|buf\|. It writes at most \|len\| bytes
	// (including the terminating NUL) and truncates the string if necessary. If
	// \|len\| is greater than zero then \|buf\| is always NUL terminated.
	//
	// The string will have the following format:
	//
	// error:[error code]:[library name]:OPENSSL_internal:[reason string]
	//
	// error code is an 8 digit hexadecimal number; library name and reason string
	// are ASCII text.
	OPENSSL_EXPORT void ERR_error_string_n(uint32_t packed_error, char *buf,
	size_t len);

	// ERR_lib_error_string returns a string representation of the library that
	// generated \|packed_error\|.
	OPENSSL_EXPORT const char *ERR_lib_error_string(uint32_t packed_error);

	// ERR_reason_error_string returns a string representation of the reason for
	// \|packed_error\|.
	OPENSSL_EXPORT const char *ERR_reason_error_string(uint32_t packed_error);

	// ERR_print_errors_callback_t is the type of a function used by
	// \|ERR_print_errors_cb\|. It takes a pointer to a human readable string (and
	// its length) that describes an entry in the error queue. The \|ctx\| argument
	// is an opaque pointer given to \|ERR_print_errors_cb\|.
	//
	// It should return one on success or zero on error, which will stop the
	// iteration over the error queue.
	typedef int (ERR_print_errors_callback_t)(const char str, size_t len,
	void *ctx);

	// ERR_print_errors_cb clears the current thread's error queue, calling
	// \|callback\| with a string representation of each error, from the least recent
	// to the most recent error.
	//
	// The string will have the following format (which differs from
	// \|ERR_error_string\|):
	//
	// [thread id]:error:[error code]:[library name]:OPENSSL_internal:[reason string]:[file]:[line number]:[optional string data]
	//
	// The callback can return one to continue the iteration or zero to stop it.
	// The \|ctx\| argument is an opaque value that is passed through to the
	// callback.
	OPENSSL_EXPORT void ERR_print_errors_cb(ERR_print_errors_callback_t callback,
	void *ctx);

	// ERR_print_errors_fp clears the current thread's error queue, printing each
	// error to \|file\|. See \|ERR_print_errors_cb\| for the format.
	OPENSSL_EXPORT void ERR_print_errors_fp(FILE *file);


	// Clearing errors.

	// ERR_clear_error clears the error queue for the current thread.
	OPENSSL_EXPORT void ERR_clear_error(void);

	// ERR_set_mark "marks" the most recent error for use with \|ERR_pop_to_mark\|.
	// It returns one if an error was marked and zero if there are no errors.
	OPENSSL_EXPORT int ERR_set_mark(void);

	// ERR_pop_to_mark removes errors from the most recent to the least recent
	// until (and not including) a "marked" error. It returns zero if no marked
	// error was found (and thus all errors were removed) and one otherwise. Errors
	// are marked using \|ERR_set_mark\|.
	OPENSSL_EXPORT int ERR_pop_to_mark(void);


	// Custom errors.

	// ERR_get_next_error_library returns a value suitable for passing as the
	// \|library\| argument to \|ERR_put_error\|. This is intended for code that wishes
	// to push its own, non-standard errors to the error queue.
	OPENSSL_EXPORT int ERR_get_next_error_library(void);


	// Built-in library and reason codes.

	// The following values are built-in library codes.
	enum {
	ERR_LIB_NONE = 1,
	ERR_LIB_SYS,
	ERR_LIB_BN,
	ERR_LIB_RSA,
	ERR_LIB_DH,
	ERR_LIB_EVP,
	ERR_LIB_BUF,
	ERR_LIB_OBJ,
	ERR_LIB_PEM,
	ERR_LIB_DSA,
	ERR_LIB_X509,
	ERR_LIB_ASN1,
	ERR_LIB_CONF,
	ERR_LIB_CRYPTO,
	ERR_LIB_EC,
	ERR_LIB_SSL,
	ERR_LIB_BIO,
	ERR_LIB_PKCS7,
	ERR_LIB_PKCS8,
	ERR_LIB_X509V3,
	ERR_LIB_RAND,
	ERR_LIB_ENGINE,
	ERR_LIB_OCSP,
	ERR_LIB_UI,
	ERR_LIB_COMP,
	ERR_LIB_ECDSA,
	ERR_LIB_ECDH,
	ERR_LIB_HMAC,
	ERR_LIB_DIGEST,
	ERR_LIB_CIPHER,
	ERR_LIB_HKDF,
	ERR_LIB_USER,
	ERR_NUM_LIBS
	};

	// The following reason codes used to denote an error occuring in another
	// library. They are sometimes used for a stack trace.
	#define ERR_R_SYS_LIB ERR_LIB_SYS
	#define ERR_R_BN_LIB ERR_LIB_BN
	#define ERR_R_RSA_LIB ERR_LIB_RSA
	#define ERR_R_DH_LIB ERR_LIB_DH
	#define ERR_R_EVP_LIB ERR_LIB_EVP
	#define ERR_R_BUF_LIB ERR_LIB_BUF
	#define ERR_R_OBJ_LIB ERR_LIB_OBJ
	#define ERR_R_PEM_LIB ERR_LIB_PEM
	#define ERR_R_DSA_LIB ERR_LIB_DSA
	#define ERR_R_X509_LIB ERR_LIB_X509
	#define ERR_R_ASN1_LIB ERR_LIB_ASN1
	#define ERR_R_CONF_LIB ERR_LIB_CONF
	#define ERR_R_CRYPTO_LIB ERR_LIB_CRYPTO
	#define ERR_R_EC_LIB ERR_LIB_EC
	#define ERR_R_SSL_LIB ERR_LIB_SSL
	#define ERR_R_BIO_LIB ERR_LIB_BIO
	#define ERR_R_PKCS7_LIB ERR_LIB_PKCS7
	#define ERR_R_PKCS8_LIB ERR_LIB_PKCS8
	#define ERR_R_X509V3_LIB ERR_LIB_X509V3
	#define ERR_R_RAND_LIB ERR_LIB_RAND
	#define ERR_R_DSO_LIB ERR_LIB_DSO
	#define ERR_R_ENGINE_LIB ERR_LIB_ENGINE
	#define ERR_R_OCSP_LIB ERR_LIB_OCSP
	#define ERR_R_UI_LIB ERR_LIB_UI
	#define ERR_R_COMP_LIB ERR_LIB_COMP
	#define ERR_R_ECDSA_LIB ERR_LIB_ECDSA
	#define ERR_R_ECDH_LIB ERR_LIB_ECDH
	#define ERR_R_STORE_LIB ERR_LIB_STORE
	#define ERR_R_FIPS_LIB ERR_LIB_FIPS
	#define ERR_R_CMS_LIB ERR_LIB_CMS
	#define ERR_R_TS_LIB ERR_LIB_TS
	#define ERR_R_HMAC_LIB ERR_LIB_HMAC
	#define ERR_R_JPAKE_LIB ERR_LIB_JPAKE
	#define ERR_R_USER_LIB ERR_LIB_USER
	#define ERR_R_DIGEST_LIB ERR_LIB_DIGEST
	#define ERR_R_CIPHER_LIB ERR_LIB_CIPHER
	#define ERR_R_HKDF_LIB ERR_LIB_HKDF

	// The following values are global reason codes. They may occur in any library.
	#define ERR_R_FATAL 64
	#define ERR_R_MALLOC_FAILURE (1 \| ERR_R_FATAL)
	#define ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED (2 \| ERR_R_FATAL)
	#define ERR_R_PASSED_NULL_PARAMETER (3 \| ERR_R_FATAL)
	#define ERR_R_INTERNAL_ERROR (4 \| ERR_R_FATAL)
	#define ERR_R_OVERFLOW (5 \| ERR_R_FATAL)


	// Deprecated functions.

	// ERR_remove_state calls \|ERR_clear_error\|.
	OPENSSL_EXPORT void ERR_remove_state(unsigned long pid);

	// ERR_remove_thread_state clears the error queue for the current thread if
	// \|tid\| is NULL. Otherwise it calls \|assert(0)\|, because it's no longer
	// possible to delete the error queue for other threads.
	//
	// Use \|ERR_clear_error\| instead. Note error queues are deleted automatically on
	// thread exit. You do not need to call this function to release memory.
	OPENSSL_EXPORT void ERR_remove_thread_state(const CRYPTO_THREADID *tid);

	// ERR_func_error_string returns the string "OPENSSL_internal".
	OPENSSL_EXPORT const char *ERR_func_error_string(uint32_t packed_error);

	// ERR_error_string behaves like \|ERR_error_string_n\| but \|len\| is implicitly
	// \|ERR_ERROR_STRING_BUF_LEN\| and it returns \|buf\|. If \|buf\| is NULL, the error
	// string is placed in a static buffer which is returned. (The static buffer may
	// be overridden by concurrent calls in other threads so this form should not be
	// used.)
	//
	// Use \|ERR_error_string_n\| instead.
	//
	// TODO(fork): remove this function.
	OPENSSL_EXPORT char ERR_error_string(uint32_t packed_error, char buf);
	#define ERR_ERROR_STRING_BUF_LEN 120

	// ERR_GET_FUNC returns zero. BoringSSL errors do not report a function code.
	#define ERR_GET_FUNC(packed_error) 0

	// ERR_TXT_STRING is provided for compatibility with code that assumes that
	// it's using OpenSSL.
	#define ERR_TXT_STRING ERR_FLAG_STRING


	// Private functions.

	// ERR_clear_system_error clears the system's error value (i.e. errno).
	OPENSSL_EXPORT void ERR_clear_system_error(void);

	// OPENSSL_PUT_ERROR is used by OpenSSL code to add an error to the error
	// queue.
	#define OPENSSL_PUT_ERROR(library, reason) \
	ERR_put_error(ERR_LIB_##library, 0, reason, __FILE__, __LINE__)

	// OPENSSL_PUT_SYSTEM_ERROR is used by OpenSSL code to add an error from the
	// operating system to the error queue.
	// TODO(fork): include errno.
	#define OPENSSL_PUT_SYSTEM_ERROR() \
	ERR_put_error(ERR_LIB_SYS, 0, 0, __FILE__, __LINE__);

	// ERR_put_error adds an error to the error queue, dropping the least recent
	// error if necessary for space reasons.
	OPENSSL_EXPORT void ERR_put_error(int library, int unused, int reason,
	const char *file, unsigned line);

	// ERR_add_error_data takes a variable number (\|count\|) of const char*
	// pointers, concatenates them and sets the result as the data on the most
	// recent error.
	OPENSSL_EXPORT void ERR_add_error_data(unsigned count, ...);

	// ERR_add_error_dataf takes a printf-style format and arguments, and sets the
	// result as the data on the most recent error.
	OPENSSL_EXPORT void ERR_add_error_dataf(const char *format, ...)
	OPENSSL_PRINTF_FORMAT_FUNC(1, 2);

	// ERR_NUM_ERRORS is one more than the limit of the number of errors in the
	// queue.
	#define ERR_NUM_ERRORS 16

	#define ERR_PACK(lib, reason) \
	(((((uint32_t)(lib)) & 0xff) << 24) \| ((((uint32_t)(reason)) & 0xfff)))

	// OPENSSL_DECLARE_ERROR_REASON is used by util/make_errors.h (which generates
	// the error defines) to recognise that an additional reason value is needed.
	// This is needed when the reason value is used outside of an
	// \|OPENSSL_PUT_ERROR\| macro. The resulting define will be
	// ${lib}_R_${reason}.
	#define OPENSSL_DECLARE_ERROR_REASON(lib, reason)


	#if defined(__cplusplus)
	} // extern C
	#endif

	#endif // OPENSSL_HEADER_ERR_H