linux+terminfo工具,Linux终端(三)

#include 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 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);

cursor = tigetstr(“cup”);

clear = tigetstr(“clear”);

screenrow = 4;

tputs(clear, 1, (int *) char_to_terminal);

tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);

fprintf(out, “Choice: %s, greet);

screenrow += 2;

option = choices;

while(*option) {

tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);

fprintf(out,”%s”, *option);

screenrow++;

option++;

}

fprintf(out, “n”);

do {

fflush(out);

selected = fgetc(in);

option = choices;

while(*option) {

if(selected == *option[0]) {

chosen = 1;

break;

}

option++;

}

if(!chosen) {

tputs(tparm(cursor, screenrow, screencol), 1, char_to_terminal);

fprintf(out,”Incorrect choice, select againn”);

}

} while(!chosen);

tputs(clear, 1, char_to_terminal);

return selected;

}

int char_to_terminal(int char_to_write)

{

if (output_stream) putc(char_to_write, output_stream);

return 0;

}

工作原理

重写的getchoice函数实现了与我们前面的例子中相同的菜单，但是输出函数进行了修改从而来使用terminfo功能。如果我们希望在屏幕被清除之前看到You have chosen:信息停留一会，可以使用下面的选择，在main函数中添加一个sleep调用：

do {

choice = getchoice(“Please select an action”, menu, input, output);

printf(“nYou have chosen: %cn”, choice);

sleep(1);

} while (choice != ‘q’);

这个程序中的最后一个函数，char_to_terminal，包含了一个我们在第3章提到的putc函数调用。

要结束这一章，我们将会看一个如何检测击键的例子。