/*

 * Copyright 1995-2026 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 <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/crypto.h>

#include <openssl/buffer.h>

#include <openssl/err.h>

#include "err_local.h"

#define ERR_PRINT_BUF_SIZE 4096

void ERR_print_errors_cb(int (*cb)(const char *str, size_t len, void *u),

    void *u)

{

    CRYPTO_THREAD_ID tid = CRYPTO_THREAD_get_current_id();

    unsigned long l;

    const char *file, *data, *func;

    int line, flags;

    while ((l = ERR_get_error_all(&file, &line, &func, &data, &flags)) != 0) {

        char buf[ERR_PRINT_BUF_SIZE] = "";

        char *hex = NULL;

        int offset;

        if ((flags & ERR_TXT_STRING) == 0)

            data = "";

        hex = ossl_buf2hexstr_sep((const unsigned char *)&tid, sizeof(tid), '\0');

        BIO_snprintf(buf, sizeof(buf), "%s:", hex == NULL ? "<null>" : hex);

        offset = (int)strlen(buf);

        ossl_err_string_int(l, func, buf + offset, sizeof(buf) - offset);

        offset += (int)strlen(buf + offset);

        BIO_snprintf(buf + offset, sizeof(buf) - offset, ":%s:%d:%s\n",

            file, line, data);

        OPENSSL_free(hex);

        if (cb(buf, strlen(buf), u) <= 0)

            break; /* abort outputting the error report */

    }

}

/* auxiliary function for incrementally reporting texts via the error queue */

static void put_error(int lib, const char *func, int reason,

    const char *file, int line)

{

    ERR_new();

    ERR_set_debug(file, line, func);

    ERR_set_error(lib, reason, NULL /* no data here, so fmt is NULL */);

}

#define TYPICAL_MAX_OUTPUT_BEFORE_DATA 100

#define MAX_DATA_LEN (ERR_PRINT_BUF_SIZE - TYPICAL_MAX_OUTPUT_BEFORE_DATA)

void ERR_add_error_txt(const char *separator, const char *txt)

{

    const char *file = NULL;

    int line;

    const char *func = NULL;

    const char *data = NULL;

    int flags;

    unsigned long err = ERR_peek_last_error();

    if (separator == NULL)

        separator = "";

    if (err == 0)

        put_error(ERR_LIB_NONE, NULL, 0, "", 0);

    do {

        size_t available_len, data_len;

        const char *curr = txt, *next = txt;

        const char *leading_separator = separator;

        int trailing_separator = 0;

        char *tmp;

        ERR_peek_last_error_all(&file, &line, &func, &data, &flags);

        if ((flags & ERR_TXT_STRING) == 0) {

            data = "";

            leading_separator = "";

        }

        data_len = strlen(data);

        /* workaround for limit of ERR_print_errors_cb() */

        if (data_len >= MAX_DATA_LEN

            || strlen(separator) >= (size_t)(MAX_DATA_LEN - data_len))

            available_len = 0;

        else

            available_len = MAX_DATA_LEN - data_len - strlen(separator) - 1;

        /* MAX_DATA_LEN > available_len >= 0 */

        if (*separator == '\0') {

            const size_t len_next = strlen(next);

            if (len_next <= available_len) {

                next += len_next;

                curr = NULL; /* no need to split */

            } else {

                next += available_len;

                curr = next; /* will split at this point */

            }

        } else {

            while (*next != '\0' && (size_t)(next - txt) <= available_len) {

                curr = next;

                next = strstr(curr, separator);

                if (next != NULL) {

                    next += strlen(separator);

                    trailing_separator = *next == '\0';

                } else {

                    next = curr + strlen(curr);

                }

            }

            if ((size_t)(next - txt) <= available_len)

                curr = NULL; /* the above loop implies *next == '\0' */

        }

        if (curr != NULL) {

            /* split error msg at curr since error data would get too long */

            if (curr != txt) {

                tmp = OPENSSL_strndup(txt, curr - txt);

                if (tmp == NULL)

                    return;

                ERR_add_error_data(2, separator, tmp);

                OPENSSL_free(tmp);

            }

            put_error(ERR_GET_LIB(err), func, err, file, line);

            txt = curr;

        } else {

            if (trailing_separator) {

                tmp = OPENSSL_strndup(txt, next - strlen(separator) - txt);

                if (tmp == NULL)

                    return;

                /* output txt without the trailing separator */

                ERR_add_error_data(2, leading_separator, tmp);

                OPENSSL_free(tmp);

            } else {

                ERR_add_error_data(2, leading_separator, txt);

            }

            txt = next; /* finished */

        }

    } while (*txt != '\0');

}

void ERR_add_error_mem_bio(const char *separator, BIO *bio)

{

    if (bio != NULL) {

        char *str;

        long len = BIO_get_mem_data(bio, &str);

        if (len > 0) {

            if (str[len - 1] != '\0') {

                if (BIO_write(bio, "", 1) <= 0)

                    return;

                len = BIO_get_mem_data(bio, &str);

            }

            if (len > 1)

                ERR_add_error_txt(separator, str);

        }

    }

}

static int print_bio(const char *str, size_t len, void *bp)

{

    return BIO_write((BIO *)bp, str, (int)len);

}

void ERR_print_errors(BIO *bp)

{

    ERR_print_errors_cb(print_bio, bp);

}

#ifndef OPENSSL_NO_STDIO

void ERR_print_errors_fp(FILE *fp)

{

    BIO *bio = BIO_new_fp(fp, BIO_NOCLOSE);

    if (bio == NULL)

        return;

    ERR_print_errors_cb(print_bio, bio);

    BIO_free(bio);

}

#endif