/*

 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <string.h>

#include <openssl/err.h>

#include "err_local.h"

void ERR_new(void)

{

    ERR_STATE *es;

    es = ossl_err_get_state_int();

    if (es == NULL)

        return;

    /* Allocate a slot */

    err_get_slot(es);

    err_clear(es, es->top, 0);

}

void ERR_set_debug(const char *file, int line, const char *func)

{

    ERR_STATE *es;

    es = ossl_err_get_state_int();

    if (es == NULL)

        return;

    err_set_debug(es, es->top, file, line, func);

}

void ERR_set_error(int lib, int reason, const char *fmt, ...)

{

    va_list args;

    va_start(args, fmt);

    ERR_vset_error(lib, reason, fmt, args);

    va_end(args);

}

void ERR_vset_error(int lib, int reason, const char *fmt, va_list args)

{

    ERR_STATE *es;

    char *buf = NULL;

    size_t buf_size = 0;

    unsigned long flags = 0;

    size_t i;

    es = ossl_err_get_state_int();

    if (es == NULL)

        return;

    i = es->top;

    if (fmt != NULL) {

        int printed_len = 0;

        char *rbuf = NULL;

        buf = es->err_data[i];

        buf_size = es->err_data_size[i];

        /*

         * To protect the string we just grabbed from tampering by other

         * functions we may call, or to protect them from freeing a pointer

         * that may no longer be valid at that point, we clear away the

         * data pointer and the flags.  We will set them again at the end

         * of this function.

         */

        es->err_data[i] = NULL;

        es->err_data_flags[i] = 0;

        /*

         * Try to maximize the space available.  If that fails, we use what

         * we have.

         */

        if (buf_size < ERR_MAX_DATA_SIZE

            && (rbuf = OPENSSL_realloc(buf, ERR_MAX_DATA_SIZE)) != NULL) {

            buf = rbuf;

            buf_size = ERR_MAX_DATA_SIZE;

        }

        if (buf != NULL) {

            printed_len = BIO_vsnprintf(buf, buf_size, fmt, args);

        }

        if (printed_len < 0)

            printed_len = 0;

        if (buf != NULL)

            buf[printed_len] = '\0';

        /*

         * Try to reduce the size, but only if we maximized above.  If that

         * fails, we keep what we have.

         * (According to documentation, realloc leaves the old buffer untouched

         * if it fails)

         */

        if ((rbuf = OPENSSL_realloc(buf, printed_len + 1)) != NULL) {

            buf = rbuf;

            buf_size = printed_len + 1;

            buf[printed_len] = '\0';

        }

        if (buf != NULL)

            flags = ERR_TXT_MALLOCED | ERR_TXT_STRING;

    }

    err_clear_data(es, es->top, 0);

    err_set_error(es, es->top, lib, reason);

    if (fmt != NULL)

        err_set_data(es, es->top, buf, buf_size, flags);

}