linux文件管理

//判断是否为目录
bool is_dir(const char *path)
{
    struct stat statbuf;
    if(lstat(path, &statbuf) ==0)//lstat返回文件的信息，文件信息存放在stat结构中
    {
        return S_ISDIR(statbuf.st_mode) != 0;//S_ISDIR宏，判断文件类型是否为目录
    }
    return false;
}


//判断是否为常规文件
bool is_file(const char *path)
{
    struct stat statbuf;
    if(lstat(path, &statbuf) ==0)
        return S_ISREG(statbuf.st_mode) != 0;//判断文件是否为常规文件
    return false;
}


//判断是否是特殊目录
bool is_special_dir(const char *path)
{
    return strcmp(path, ".") == 0 || strcmp(path, "..") == 0;
}


//生成完整的文件路径
void get_file_path(const char *path, const char *file_name,  char *file_path)
{
    strcpy(file_path, path);
    if(file_path[strlen(path) - 1] != '/')
        strcat(file_path, "/");
    strcat(file_path, file_name);
}


void delete_file(const char *path)
{
    DIR *dir;
    dirent *dir_info;
    char file_path[PATH_MAX];
    if(is_file(path))
    {
        remove(path);
        return;
    }
    if(is_dir(path))
    {
        if((dir = opendir(path)) == NULL)
            return;
        while((dir_info = readdir(dir)) != NULL)
        {
            get_file_path(path, dir_info->d_name, file_path);
            if(is_special_dir(dir_info->d_name))
                continue;
            delete_file(file_path);
            rmdir(file_path);
        }
    }
}
//拷贝源文件夹中的文件到目标文件夹
int cpfile(char const* from,char const* to)//此处的路径具体到文件名
{
    FILE* fd_from=fopen(from,"r");
    printf("sourcefile:%s\n",from);
    if(fd_from==NULL)
    {
        printf("open %s failed!!!\n",from);
        return -1;
    }


    FILE* fd_to=fopen(to,"w");
    if(fd_to==NULL)
    {
        printf("open %s failed!!!\n",to);
        return -1;
    }


    char buffer[100000];
    int read_size=100000;
    int write_size=100000;
    while(read_size==100000)
    {
        read_size=fread(buffer,1,100000,fd_from);
        write_size=fwrite(buffer,1,read_size,fd_to);
        if(read_size!=write_size)
        {
            printf("write file error!!!\n");
        }
    }
    fclose(fd_from);
    fclose(fd_to);
    return 0;
}


int goindir(const char *dir,string* ret_sons)//进入文件夹内部
{
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;
    if((dp = opendir(dir)) == NULL)
    {
        fprintf(stderr,"cannot open directory: %s\n", dir);
        return -1;
    }
    int files_cnt=0;
    while((entry = readdir(dp)) != NULL)
    {
        lstat(entry->d_name,&statbuf);
        //if(S_ISDIR(statbuf.st_mode)) {
        printf(entry->d_name);
        if(strcmp(".",entry->d_name) == 0 ||
                strcmp("..",entry->d_name) == 0)
            continue;
        ret_sons[files_cnt]=entry->d_name;
        files_cnt++;
        //}
    }
    closedir(dp);
    return files_cnt;
}
int find_in_otherdir(const char * from_father,const char* to_path)//判断文件是否在其他路径中存在
{
    DIR *dp;
    struct dirent *entry;
    struct stat statbuf;
    if((dp = opendir(from_father)) == NULL)
    {
        fprintf(stderr,"cannot open directory: %s\n", from_father);
        return -1;
    }
    while((entry = readdir(dp)) != NULL)
    {
        lstat(entry->d_name,&statbuf);
        if(S_ISDIR(statbuf.st_mode))
        {


            if(strcmp(".",entry->d_name) == 0 ||
                    strcmp("..",entry->d_name) == 0)
                continue;
            string temp=entry->d_name;
            if(temp==to_path)
            {
                printf("%s is included in %s!!!\n",to_path,from_father);
                return 0;
            }
        }
    }
    closedir(dp);
    return 1;
}