如何使用c编程将某些字符串从文件复制到另一个文件？

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

#define BUFFER_SIZE 1024

int main() {
    FILE *sourceFile, *destinationFile;
    char buffer[BUFFER_SIZE];
    size_t bytesRead;

    // 打开源文件和目标文件
    sourceFile = fopen("source.txt", "r");
    if (sourceFile == NULL) {
        perror("Error opening source file");
        return EXIT_FAILURE;
    }
    destinationFile = fopen("destination.txt", "w");
    if (destinationFile == NULL) {
        perror("Error opening destination file");
        fclose(sourceFile);
        return EXIT_FAILURE;
    }

    // 从源文件读取内容并写入目标文件
    while ((bytesRead = fread(buffer, 1, BUFFER_SIZE, sourceFile)) > 0) {
        if (fwrite(buffer, 1, bytesRead, destinationFile) != bytesRead) {
            perror("Error writing to destination file");
            break;
        }
    }

    // 检查是否读取过程中出现错误
    if (ferror(sourceFile)) {
        perror("Error reading from source file");
    }

    // 关闭文件
    fclose(sourceFile);
    fclose(destinationFile);

    return EXIT_SUCCESS;
}