左右移动光标。在换行符或字符过多时停止输入
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#define ESC 27
#define INSERT 50
#define DELETE 51
#define PGUP 53
#define PGDN 54
#define ARROWRIGHT 67
#define ARROWLEFT 68
#define END 70
#define HOME 72
#define OTHER 79
#define BRACKETLEFT 91
#define TILDE 126
#define BACKSPACE 127
#define SIZE 30
static const int STDIN = 0;
int kbhit(void)
{
int bytesWaiting;
ioctl(STDIN, FIONREAD, &bytesWaiting);
return bytesWaiting;
}
int main ( ) {
char input[SIZE] = {'\0'};
int insert = 0;
int each = 0;
int end = 0;
int to = 0;
int ch = 0;
int row = 0;
int col = 0;
struct termios oldattr, newattr;
//set terminal
tcgetattr( STDIN, &oldattr );
newattr = oldattr;
newattr.c_lflag &= ~( ICANON | ECHO );
tcsetattr( STDIN, TCSANOW, &newattr );
setbuf(stdin, NULL);
printf ( "\033[2J");//clear screen
printf ( "\033[25;1H");//move cursor to row 25 col 1
printf ( "OVW");
printf ( "\033[9;1H");//move cursor to row 9 col 1
printf ( "enter your text ");//prompt
//printf ( "%s", input);
printf ( "\033[9;17H");//move cursor to row 9 col 17
col = 17;
row = 9;
while ( ( ch = getchar ()) != '\n') {
if ( isprint( ch)) {
if ( insert && each < end && end < SIZE-3) {
//expand
end++;
for ( to = end; to >= each; to--) {
input[to + 1] = input[to];
}
printf ( "\033[9;17H");//move cursor to row 9 col 12
printf ( "\033[K");//erase to end of line
printf ( "%s", input);
}
printf ( "\033[%d;%dH", row, col);
printf ( "%c", ch);
input[each] = ch;
each++;
if ( each > end) {
end = each;
}
col++;
if ( each == end) {
input[each] = '\0';
}
if ( each >= SIZE-1) {
break;
}
continue;
}
if ( ch == BACKSPACE) {
if ( each) {
each--;
col--;
//contract
for ( to = each; to <= end; to++) {
input[to] = input[to + 1];
}
end--;
printf ( "\033[9;17H");//move cursor to row 1 col 7
printf ( "\033[K");//erase to end of line
printf ( "%s", input);
printf ( "\033[%d;%dH", row, col);
}
}
if ( ch == ESC) {
if ( !kbhit ( )) {
continue;
}
ch = getchar ( );
if ( ch == OTHER) {
ch = getchar ( );
if ( ch == HOME) {
col -= each;
each = 0;
printf ( "\033[%d;%dH", row, col);
ch = getchar ( );
}
if ( ch == END) {
col += end - each;
each = end;
printf ( "\033[%d;%dH", row, col);
ch = getchar ( );
}
}
if ( ch == BRACKETLEFT) {
ch = getchar ( );
if ( ch == INSERT) {
ch = getchar ( );
if ( ch == TILDE) {
insert = !insert;
printf ( "\033[25;1H");//move cursor to row 25 col 1
if ( insert) {
printf ( "INS");
}
else {
printf ( "OVW");
}
printf ( "\033[%d;%dH", row, col);
}
}
if ( ch == DELETE) {
ch = getchar ( );
if ( ch == TILDE) {
//contract
for ( to = each; to <= end; to++) {
input[to] = input[to + 1];
}
end--;
printf ( "\033[9;17H");//move cursor to row 10 col 1
printf ( "\033[K");//erase to end of line
printf ( "%s", input);
printf ( "\033[%d;%dH", row, col);
}
}
if ( ch == ARROWRIGHT) {
if ( each < end) {
printf ( "\033[C");//cursor right
each++;
col++;
}
}
if ( ch == ARROWLEFT) {
if ( each) {
printf ( "\033[D");//cursor left
each--;
col--;
}
}
}
else {
ungetc ( ch, stdin);
}
}
}
printf ( "\n\ninput was [%s]\n", input);
printf ( "\n\nbye\n");
//restore terminal
tcsetattr( STDIN, TCSANOW, &oldattr );
return 0;
}