将一个指针的值复制到另一个指针

char *command 到a char *command_copy ,因为我正在对 command

这是我的代码:

int main(void)
{
    init_ui();
    hist_init(100);

    char *command;
    while (true) {
        signal(SIGINT, SIG_IGN);
        command = read_command();
        if (command == NULL) {
            break;
        }
        char *command_copy;
        command_copy = (char *) malloc(1000);
        memcpy(command_copy, command, sizeof(*command));
        char *args[4096];
        int tokens = 0;
        char *next_tok = command;
        char *curr_tok;
        while((curr_tok = next_token(&next_tok, " \t\n\r")) != NULL) {
            if(strncmp(curr_tok, "#", 1) == 0){
                break;
            }
            args[tokens++] = curr_tok;
        }
        args[tokens] = NULL;

        if(args[0] == NULL) {
            continue;
        }

        hist_add(command);

        int builtin_status = handle_builtins(tokens, args);
        if(builtin_status == 0) {
            continue;
        }

        pid_t child = fork();
        if(child == -1){
            perror("fork");
        }
        ...

我想要 hist_add() command_copy 命令 因为 命令 历史添加()

read_命令(void):

char *read_command(void)
{
    if(scripting == true) {
        ssize_t read_sz = getline(&line, &line_sz, stdin);
        if(read_sz == -1){
            perror("getline");
            free(line);
            return NULL;
        }
        line[read_sz - 1] = '\0';
        return line;
    }
    else {
        return readline(prompt_line());
    }
}