/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <getopt.h>
#include <errno.h>

char *load_file_to_cstring(const char *path)
{
    FILE *pem_file = fopen(path, "rb");
    if (!pem_file) {
       fprintf(stderr, "Failed to open file %s: '%s'\n", path, strerror(errno));
       return NULL;
    }

    /* Make sure we can fit the pem into the output buffer */
    if (fseek(pem_file, 0, SEEK_END) < 0) {
        fprintf(stderr, "Failed calling fseek: '%s'\n", strerror(errno));
        fclose(pem_file);
        return NULL;
    }

    const long int pem_file_size = ftell(pem_file);
    if (pem_file_size < 0) {
        fprintf(stderr, "Failed calling ftell: '%s'\n", strerror(errno));
        fclose(pem_file);
        return NULL;
    }

    rewind(pem_file);

    char *pem_out = malloc(pem_file_size + 1);
    if (pem_out == NULL) {
        fprintf(stderr, "Failed allocating memory\n");
        fclose(pem_file);
        return NULL;
    }

    if (fread(pem_out, sizeof(char), pem_file_size, pem_file) < pem_file_size) {
        fprintf(stderr, "Failed reading file: '%s'\n", strerror(errno));
        free(pem_out);
        fclose(pem_file);
        return NULL;
    }

    pem_out[pem_file_size] = '\0';
    fclose(pem_file);

    return pem_out;
}