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Posted By

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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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5.  
  6.  
  7. /* using sleep function in windoze */
  8. #include <windows.h>
  9. #define yieldcpu() Sleep(0)
  10. /* Works when using deprecated stdlib _sleep */
  11.  
  12. /* quit = 1 when user presses escape key */
  13. unsigned char quit=0;
  14.  
  15. /* this is the buffer for input */
  16. #define maxbuf 256
  17. char buf[maxbuf];
  18.  
  19. /* what happened to cputs? */
  20. #define cputs(a) printf(a)
  21.  
  22.  
  23.  
  24. #ifndef NOCONIO
  25.  
  26. #include <conio.h>
  27.  
  28.  
  29. void repeatchar(char c,int n){
  30.  while(n--)putch(c);
  31. }
  32.  
  33.  
  34. void newline(){
  35.  putch('\r');
  36.  putch('\n');
  37. }
  38.  
  39.  
  40. unsigned short getkey(){
  41.  unsigned char c;
  42.  while(!kbhit())yieldcpu();
  43.  c=getch();
  44.  if(c==27)quit=1;
  45.  if(c==224)return 256+getkey();
  46.  return c;
  47. }
  48.  
  49.  
  50. void pause(){
  51.  cputs("Press any key");
  52.  getkey();
  53.  newline();
  54. }
  55.  
  56.  
  57. void getstring(){
  58.  unsigned short c;
  59.  unsigned char ox=0;
  60.  unsigned char x=0;
  61.  unsigned char h=0;
  62.  while(!quit){
  63.   buf[h]=0;
  64.   putch('\r');//use gotox instead if you want something before input
  65.   cputs(buf);
  66.   putch(' ');
  67.   repeatchar(8,h-x+1);//using instead of gotox(x), puts cursor at correct position
  68.   c=getkey();
  69.   if(quit)break;
  70.   switch(c){
  71.    default:
  72.    if(h>=maxbuf-1)continue;
  73.    if(x<h){
  74.     memmove(buf+x+1,buf+x,h-x);
  75.     ++h;
  76.    }
  77.    buf[x]=c;
  78.    ++x;
  79.    if(x>h)h=x;
  80.    continue;
  81.  
  82.    case 8://backspace
  83.    if(x){
  84.     ox=x;
  85.     --x;
  86.     Del:
  87.     if(x<h){
  88.      memmove(buf+x,buf+ox,h-ox);
  89.      --h;
  90.     }
  91.    }
  92.    continue;
  93.  
  94.    case 339://delete key
  95.    ox=x+1;
  96.    goto Del;
  97.  
  98.    case 331://left arrow
  99.    if(x){
  100.     --x;
  101.    }
  102.    continue;
  103.  
  104.    case 333://right arrow
  105.    if(x<h){
  106.     ++x;
  107.    }
  108.    continue;
  109.  
  110.    case 327://home
  111.    x=0;
  112.    continue;
  113.  
  114.    case 335://end
  115.    x=h;
  116.    continue;
  117.  
  118.    case 13://enter
  119.    newline();
  120.    return;
  121.   }
  122.  }
  123. }
  124.  
  125.  
  126. #else
  127.  
  128.  
  129. void newline(){
  130.  putchar('\r');
  131.  putchar('\n');
  132. }
  133.  
  134.  
  135. void getstring(){
  136.  fgets(buf,maxbuf,stdin);
  137.  buf[strlen(buf)-1]=0;/* get rid of newline */
  138. }
  139.  
  140.  
  141. void pause(){
  142.  puts("Press Enter");
  143.  getchar();
  144. }
  145.  
  146.  
  147. #endif
  148.  
  149.  
  150.  
  151. /* demo program */
  152. int main(){
  153.  printf("Wat's ur name?");
  154.  newline();
  155.  getstring();
  156.  printf("Heya, %s!",buf);
  157.  newline();
  158.  pause();
  159.  return 0;
  160. }

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