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Zufolek on 11/24/09

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Fancy String Input using Conio

/ Published in: C

Windows console string input allowing use of left and right arrow keys, backspace, and delete. For portability, falls back to stdio functions when you define NOCONIO.

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* using sleep function in windoze */
#include <windows.h>
#define yieldcpu() Sleep(0)
/* Works when using deprecated stdlib _sleep */

/* quit = 1 when user presses escape key */
unsigned char quit=0;

/* this is the buffer for input */
#define maxbuf 256
char buf[maxbuf];

/* what happened to cputs? */
#define cputs(a) printf(a)

#ifndef NOCONIO

#include <conio.h>

void repeatchar(char c,int n){
 while(n--)putch(c);
}

void newline(){
 putch('\r');
 putch('\n');
}

unsigned short getkey(){
 unsigned char c;
 while(!kbhit())yieldcpu();
 c=getch();
 if(c==27)quit=1;
 if(c==224)return 256+getkey();
 return c;
}

void pause(){
 cputs("Press any key");
 getkey();
 newline();
}

void getstring(){
 unsigned short c;
 unsigned char ox=0;
 unsigned char x=0;
 unsigned char h=0;
 while(!quit){
  buf[h]=0;
  putch('\r');//use gotox instead if you want something before input
  cputs(buf);
  putch(' ');
  repeatchar(8,h-x+1);//using instead of gotox(x), puts cursor at correct position
  c=getkey();
  if(quit)break;
  switch(c){
   default:
   if(h>=maxbuf-1)continue;
   if(x<h){
    memmove(buf+x+1,buf+x,h-x);
    ++h;
   }
   buf[x]=c;
   ++x;
   if(x>h)h=x;
   continue;

case 8://backspace
   if(x){
    ox=x;
    --x;
    Del:
    if(x<h){
     memmove(buf+x,buf+ox,h-ox);
     --h;
    }
   }
   continue;

case 339://delete key
   ox=x+1;
   goto Del;

case 331://left arrow
   if(x){
    --x;
   }
   continue;

case 333://right arrow
   if(x<h){
    ++x;
   }
   continue;

case 327://home
   x=0;
   continue;

case 335://end
   x=h;
   continue;

case 13://enter
   newline();
   return;
  }
 }
}

#else

void newline(){
 putchar('\r');
 putchar('\n');
}

void getstring(){
 fgets(buf,maxbuf,stdin);
 buf[strlen(buf)-1]=0;/* get rid of newline */
}

void pause(){
 puts("Press Enter");
 getchar();
}

#endif

/* demo program */
int main(){
 printf("Wat's ur name?");
 newline();
 getstring();
 printf("Heya, %s!",buf);
 newline();
 pause();
 return 0;
}

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