fread（）读取多余的空格

Question

使用fread（）从文件中读取时，缓冲区中的空间比预期的要多。因此，如果原始文档为22个字符，则file_size和result将为22个字符，而text将为30个字符。

对我来说这没有意义，并且已经尝试了一段时间。关于为什么发生这种情况以及解决方案的任何想法？我是C的新手。

这是我的代码：

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

/* For Windows machines */
#if defined(_WIN32) || defined(_WIN64)
    #define PLATFORM_NAME "windows"
    #define CWD_PLATFORM (cwd = _getcwd(NULL, 0)
    #include <direct.h>
#endif

/* For Linux machines */
#if defined(__linux__)
    #define PLATFORM_NAME "linux"
    #define CWD_PATH_MAX PATH_MAX
    #define CWD_PLATFORM (cwd = getcwd(NULL, 0)
    #include <unistd.h>
#endif

#include <limits.h>
#include "encrypt_text.h"

#define MAX_FILE_SIZE 512

void read_from_file(void);

void read_from_file(void) {

    char file_name[MAX_FILE_SIZE];
    char *cwd;
    char *text;
    FILE *file;
    long file_size;
    size_t result;

    /* Getting the name of the file to be encrypted */
    printf("Enter the name of the file to be encrypted: ");
    fgets(file_name, MAX_FILE_SIZE, stdin);

    file_name[strcspn(file_name, "\n")] = 0;

    /* Checking if there are any errors in opening */
    if((file = fopen(file_name, "r")) == NULL) {
        perror("Cannot open file");
        exit(EXIT_FAILURE);
    }

    /* Getting the file size */
    fseek(file, 0, SEEK_END);
    file_size = ftell(file);
    rewind(file);

    /* Allocating memory based on the file size */
    text = (char *) malloc(sizeof(char) * file_size);
    if(text == NULL) {
        perror("Insufficient memory");
        exit(EXIT_FAILURE);
    }

    printf("file_size:: %d\n", file_size); //debug

    /* Copying the file into the text buffer */
    result = fread(text, sizeof(char), file_size, file);
    if(result != file_size) {
        perror("Error reading file");
        exit(EXIT_FAILURE);
    }

    printf("RESULT:: %d\n", result);

    printf("file_size:: %d\n", file_size); //debug
    printf("TEXT STRLEN:: %d\n", strlen(text)); //debug

    /* Creating a new file with the ".enc" extension */
    char *cipher_text = encrypt_text(text);
    char *new_file = strcat(file_name, ".enc");

    /* Creating the file in write mode */
    file = fopen(new_file, "w");

    /* Writing to the new file */

    fwrite(cipher_text, sizeof(char), strlen(cipher_text), file);

    /* Closing the file stream */
    fclose(file);

    /* Getting the Current Working Directory (CWD) */
    if(CWD_PLATFORM) != NULL) {
        if(PLATFORM_NAME == "windows") {
            printf("Saved encrypted text to: %s\\%s\n", cwd, new_file);
        }
        else if(PLATFORM_NAME == "linux") {
            printf("Saved encrypted text to: %s/%s\n", cwd, new_file);
        }
    } else {
        perror("CWD error");
        exit(EXIT_FAILURE);
    }

    /* Deallocating allocated memory */
    free(text);
}