/* crypto/err/err.c */
/* 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) 1998-2001 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).
 *
 */

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include "cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/bio.h>
#include <openssl/err.h>

static unsigned long get_error_values(int inc, int top,
                                      const char **file, int *line,
                                      const char **data, int *flags);

#define err_clear_data(p,i) \
        do { \
        if (((p)->err_data[i] != NULL) && \
                (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
                {  \
                OPENSSL_free((p)->err_data[i]); \
                (p)->err_data[i]=NULL; \
                } \
        (p)->err_data_flags[i]=0; \
        } while(0)

#define err_clear(p,i) \
        do { \
        (p)->err_flags[i]=0; \
        (p)->err_buffer[i]=0; \
        err_clear_data(p,i); \
        (p)->err_file[i]=NULL; \
        (p)->err_line[i]= -1; \
        } while(0)

void ERR_put_error(int lib, int func, int reason, const char *file, int line)
{
    ERR_STATE *es;

#ifdef _OSD_POSIX
    /*
     * In the BS2000-OSD POSIX subsystem, the compiler generates path names
     * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
     * something sensible. @@@ We shouldn't modify a const string, though.
     */
    if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
        char *end;

        /* Skip the "*POSIX(" prefix */
        file += sizeof("*POSIX(") - 1;
        end = &file[strlen(file) - 1];
        if (*end == ')')
            *end = '\0';
        /* Optional: use the basename of the path only. */
        if ((end = strrchr(file, '/')) != NULL)
            file = &end[1];
    }
#endif
    es = ERR_get_state();

    es->top = (es->top + 1) % ERR_NUM_ERRORS;
    if (es->top == es->bottom)
        es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
    es->err_flags[es->top] = 0;
    es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
    es->err_file[es->top] = file;
    es->err_line[es->top] = line;
    err_clear_data(es, es->top);
}

void ERR_clear_error(void)
{
    int i;
    ERR_STATE *es;

    es = ERR_get_state();

    for (i = 0; i < ERR_NUM_ERRORS; i++) {
        err_clear(es, i);
    }
    es->top = es->bottom = 0;
}

unsigned long ERR_get_error(void)
{
    return (get_error_values(1, 0, NULL, NULL, NULL, NULL));
}

unsigned long ERR_get_error_line(const char **file, int *line)
{
    return (get_error_values(1, 0, file, line, NULL, NULL));
}

unsigned long ERR_get_error_line_data(const char **file, int *line,
                                      const char **data, int *flags)
{
    return (get_error_values(1, 0, file, line, data, flags));
}

unsigned long ERR_peek_error(void)
{
    return (get_error_values(0, 0, NULL, NULL, NULL, NULL));
}

unsigned long ERR_peek_error_line(const char **file, int *line)
{
    return (get_error_values(0, 0, file, line, NULL, NULL));
}

unsigned long ERR_peek_error_line_data(const char **file, int *line,
                                       const char **data, int *flags)
{
    return (get_error_values(0, 0, file, line, data, flags));
}

unsigned long ERR_peek_last_error(void)
{
    return (get_error_values(0, 1, NULL, NULL, NULL, NULL));
}

unsigned long ERR_peek_last_error_line(const char **file, int *line)
{
    return (get_error_values(0, 1, file, line, NULL, NULL));
}

unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
                                            const char **data, int *flags)
{
    return (get_error_values(0, 1, file, line, data, flags));
}

static unsigned long get_error_values(int inc, int top, const char **file,
                                      int *line, const char **data,
                                      int *flags)
{
    int i = 0;
    ERR_STATE *es;
    unsigned long ret;

    es = ERR_get_state();

    if (inc && top) {
        if (file)
            *file = "";
        if (line)
            *line = 0;
        if (data)
            *data = "";
        if (flags)
            *flags = 0;

        return ERR_R_INTERNAL_ERROR;
    }

    if (es->bottom == es->top)
        return 0;
    if (top)
        i = es->top;            /* last error */
    else
        i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */

    ret = es->err_buffer[i];
    if (inc) {
        es->bottom = i;
        es->err_buffer[i] = 0;
    }

    if ((file != NULL) && (line != NULL)) {
        if (es->err_file[i] == NULL) {
            *file = "NA";
            if (line != NULL)
                *line = 0;
        } else {
            *file = es->err_file[i];
            if (line != NULL)
                *line = es->err_line[i];
        }
    }

    if (data == NULL) {
        if (inc) {
            err_clear_data(es, i);
        }
    } else {
        if (es->err_data[i] == NULL) {
            *data = "";
            if (flags != NULL)
                *flags = 0;
        } else {
            *data = es->err_data[i];
            if (flags != NULL)
                *flags = es->err_data_flags[i];
        }
    }
    return ret;
}

void ERR_set_error_data(char *data, int flags)
{
    ERR_STATE *es;
    int i;

    es = ERR_get_state();

    i = es->top;
    if (i == 0)
        i = ERR_NUM_ERRORS - 1;

    err_clear_data(es, i);
    es->err_data[i] = data;
    es->err_data_flags[i] = flags;
}

void ERR_add_error_data(int num, ...)
{
    va_list args;
    int i, n, s;
    char *str, *p, *a;

    s = 80;
    str = OPENSSL_malloc(s + 1);
    if (str == NULL)
        return;
    str[0] = '\0';

    va_start(args, num);
    n = 0;
    for (i = 0; i < num; i++) {
        a = va_arg(args, char *);
        /* ignore NULLs, thanks to Bob Beck <beck@obtuse.com> */
        if (a != NULL) {
            n += strlen(a);
            if (n > s) {
                s = n + 20;
                p = OPENSSL_realloc(str, s + 1);
                if (p == NULL) {
                    OPENSSL_free(str);
                    goto err;
                } else
                    str = p;
            }
            BUF_strlcat(str, a, (size_t)s + 1);
        }
    }
    ERR_set_error_data(str, ERR_TXT_MALLOCED | ERR_TXT_STRING);

 err:
    va_end(args);
}

int ERR_set_mark(void)
{
    ERR_STATE *es;

    es = ERR_get_state();

    if (es->bottom == es->top)
        return 0;
    es->err_flags[es->top] |= ERR_FLAG_MARK;
    return 1;
}

int ERR_pop_to_mark(void)
{
    ERR_STATE *es;

    es = ERR_get_state();

    while (es->bottom != es->top
           && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
        err_clear(es, es->top);
        es->top -= 1;
        if (es->top == -1)
            es->top = ERR_NUM_ERRORS - 1;
    }

    if (es->bottom == es->top)
        return 0;
    es->err_flags[es->top] &= ~ERR_FLAG_MARK;
    return 1;
}

#ifdef OPENSSL_FIPS

static ERR_STATE *fget_state(void)
{
    static ERR_STATE fstate;
    return &fstate;
}

ERR_STATE *(*get_state_func) (void) = fget_state;
void (*remove_state_func) (unsigned long pid);

ERR_STATE *ERR_get_state(void)
{
    return get_state_func();
}

void int_ERR_set_state_func(ERR_STATE *(*get_func) (void),
                            void (*remove_func) (unsigned long pid))
{
    get_state_func = get_func;
    remove_state_func = remove_func;
}

void ERR_remove_state(unsigned long pid)
{
    if (remove_state_func)
        remove_state_func(pid);
}

#endif