Re: Newbie:getch??

[Jose Camargo <ildefonso_camargo at yahoo dot com>]

Ok, depending on the plataform where you are working
on, you should use the ncurses library or something
like that.  At least, that's the only way I know.

--- Joachim <nuklear@singnet.com.sg> escribió:
> Hi there!
> I'm very new with gcc so please forgive me my stupid
> question!
> 
> I was wondering if there would be a function
> available that reads only
> one character from stdin.
> To be more specific I need something that works the
> same way as:
> kbhit() or...
> getch() or...
> getche() alias Borlands <conio.h>
> 
> I need it to write an input function to handle my
> own keyboard
> definitions. 
> Unfortunatly getchar() is unsuitablee for what I
> want to do. 
> Any glues on what to use?
> 
> Thank's  
> 
> 	Joachim!> /*
> 19. Feb. 2000
> Joachim Bauernberger
> This is a list of features to be implemented for the
> Gas Tracker project.
> 
> Here are a couple of ideas for Gas Tracker that are
> floating around in my head
> and scream to be put to paper 8-)
> 
> 1)	Rewrite the input function in the following way:
> 
> -->	check for keys pressed and accept the following:
>     a) digits
>     b) . use with float
>     c) Y = YES
>     d) N = NO
>     e) H = HELP
>     f) S = SAVE
>     g) Q = QUIT
>     h) C = Calculate
>     i) arrow keys
> 
> Note:
> * In case of a yes or no answer we have to be able
> to accept toupper(y/n)
> * The H key enables us to give guidance for lost
> souls 8-)
> * The S key saves everything to a file.
> * The Q key quits the program.
> 
> * The arrow keys help us in navigating through the
> different locations of the
>   program. This way we can change some of the values
> that we don't like but
>   have already entered earlier.
>   We have to make sure that all calculation will
> start after the C butten is
>   pusehed.
> 
> * This will make extensive use of pointers YIKES!
> 
> 
> 
> */
> 
> #include <stdio.h>
> #include <ctype.h>
> 
> #define CR 0x0d		           //carriage return (enter
> key)
> #define ESC 0x1b               //Escape key
> #define TAB 0x09               //Tab key
> #define LF 0x0a                //Line feed
> #define BACKSPACE 0x08         //Backspace
> #define SAVE 0x13              //Ctrl-S for Save
> #define HELP 0x08              //Ctrl-H for Help
> #define QUIT 0x11              //Ctrl-Q for Quit
> #define NULL 0		           //Empty character
> #define TRUE 1
> #define FALSE 0
> #define LENGTH 10	           //size of the string
> 
> int input(char *string, int length);
> 
> int main()
> {
> 
> 	char string[LENGTH];
> 
>         printf("Enter the text:\n");
>         if (!input(string,LENGTH))
>         printf("You entered: %s!\n",string);
>         else
>         printf("\n***** CANCELED. *****");
>         return 0;
> }
> 
> int input(char *string, int length)
> {
>     	int done = FALSE;
>         int cancel = FALSE;
>         int index = 0;
>         char ch;
> 
>         	string[0] = NULL;	//initialize the buffer
> 
>                 do {
>                 	ch = getc(stdin);      /*we need to
> change this to something that accepts only one
> char!*/
> 
>                         /*check to see whether the
> buffer is full*/
>                         if (index == length) {
>                         	switch (ch) {
>                                 	case CR:
>                                         	break;
>                                         default:
>                                         
> putchar('\a');
>                                         	ch = NULL;
>                                                
> break;
>                                         } //end
> switch
>                         }  //end if
> 
>                 /*process the keyboard input*/
> 
>                 switch(ch) {
>                 	case CR:  //enter key
>                         	putchar(ch);
>                                 putchar(LF);
>                         	string[index] = NULL;
>                                 done = TRUE; //set
> variable to exit while after break
>                                 break; //break out
> of switch
> 
>                         case NULL:
>                         	break;
> 
>                         case BACKSPACE:
>                             if (index == 0) {
> //bounds checking if the index is 0
> 
>                             	break;
>                             }
>                             else
>                         	putchar(ch);
>                                 putchar(' ');
>                                 putchar(ch);
>                                 index--;
> 
>                                 break;
> 
>                         case ESC:
>                                 done = TRUE;
>                                 cancel = TRUE;
>                                 break;
> 
>                         default:
>                         	putchar(ch);
>                                 string[index] = ch;
>                                 index++;
> 
>                                 break;
>                         }  //end switch
>                 } while (!done);   //end do-while
>                 return(cancel);
> } //end
> 

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