菜单函数以及终端控制

beyes

测试代码：

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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <termios.h>
#include <term.h>
#include <curses.h>

static FILE *output_stream = (FILE *)0;

char *menu[] = {
        "a - add new record",
        "d - delete record",
        "q - quit",
        NULL,
        };

int getchoice(char *greet, char *choices[], FILE *in, FILE *out);
int char_to_terminal(int char_to_write);

int main()
{
        int choice = 0;
        FILE *input;
        FILE *output;

        if(!isatty(fileno(stdout))) {
                fprintf(stderr, "you are not a terminal, OK.\n");
        }

        input = fopen("/dev/tty", "r");
        output = fopen("/dev/tty", "w");
        if(!input || !output) {
                fprintf(stderr, "Unable to open /dev/tty\n");
                exit(1);
        }

        do {
                choice = getchoice("Please select an action", menu, input, output);
                printf("You have chosen: %c\n", choice);
                sleep(2);
        } while(choice != 'q');
        exit(0);
}

int getchoice(char *greet, char *choices[], FILE *in, FILE *out)
{
        int chosen = 0;
        int selected;
        int screenrow, screencol = 10;

        char **option;
        char *cursor, *clear;

        output_stream = out;

        setupterm(NULL, fileno(out), (int *)0);/*设置终端*/
        cursor = tigetstr("cup"); /*得到光标位置转义序列*/
        clear = tigetstr("clear"); /*得到clear清屏转义序列*/

        screenrow = 4;
        tputs(clear, 1, char_to_terminal);/*清屏*/
        tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);/*定位光标*/
        fprintf(out, "choice: %s", greet);
        screenrow += 2;
        option = choices;
        while(*option) { /*打印菜单,每次换行都需设置一次*/
                tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);                  
                fprintf(out, "%s", *option);
                screenrow++;
                option++;
        }
        fprintf(out, "\n");

        do {
                fflush(out); /*清缓冲区*/
                selected = fgetc(in);
                option = choices;
                while(*option) {  /*检查输入选项*/
                        if(selected == *option[0]) {
                                chosen = 1;
                                break;
                        }
                        option++;
        }
        if(!chosen && selected != '\n') { /*遇到回车符不打印出错信息*/
                tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);
                fprintf(out, "Incorrtct choice, select again\n");
        }
        } while(!chosen);

        tputs(clear, 1, char_to_terminal);
        return selected;
}
/*构造 putchar() 型函数,putc() 相当于 putchar()*/
int char_to_terminal(int char_to_write)
{
        if(output_stream) putc(char_to_write, output_stream);
        return 0;
}

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运行及输出：
为了看清每次的选择后再清屏就用了 sleep() 函数进行 2s 的延迟。