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Full Discussion: C shell program
Homework and Emergencies Homework & Coursework Questions C shell program Post 303015364 by zorro_phu on Tuesday 3rd of April 2018 02:59:35 PM
Old 04-03-2018
Linux C shell program
1. I've have to write a shell program that accepts Ctrl+T (in linux os in c language) and should print out the current time and date to the screen. I've written the following code but i've to type ^T individual rather than pressing ctrl+T(^T) to get the output. :

2. How do i make the shell program to react when i press ctrl+T without having to press enter. For the following code which i wrote requires me to press enter to execute the command

Code:
#include<stdio.h>
#include<time.h>
#include<unistd.h>
#include<string.h>
#include<unistd.h>
#include<stdlib.h>

int main(void){
		
	time_t t;
	char buffer[100];
	int count;
	
	printf("My Prompt$: ");
	fflush(stdout);
	
	for(;;){
		count = read(0,buffer,99);
		buffer[count] = '\0';
		
		if(strncmp(buffer,"^T",2)==0){
			time(&t);
			printf("%s\n",ctime(&t));
		}
		if(strncmp(buffer,"exit",4)==0){
			exit(0);
		}
		printf("My Promts$ : ");
		fflush(stdout);
	}	
}

Output:
[zorro@localhost Desktop]$ gcc hw8.c
[zorro@localhost Desktop]$ ./a.out
My Prompt$: ^T // have to type ^T
Tue Apr 3 14:47:10 2018

My Promts$ : ^T // when i pressed ctrl+T & have to press enter
My Promts$ : ^T
My Promts$ : exit
[zorro@localhost Desktop]$



4. Assumption University, Bangkok, Thailand, Wanchat.C, CE4207
 

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LEARN ABOUT MOJAVE

readkey

readkey(3alleg4)                                                  Allegro manual                                                  readkey(3alleg4)

NAME

       readkey - Returns the next character from the keyboard buffer. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int readkey();

DESCRIPTION

       Returns  the next character from the keyboard buffer, in ASCII format. If the buffer is empty, it waits until a key is pressed. You can see
       if there are queued keypresses with keypressed().

       The low byte of the return value contains the ASCII code of the key, and the high byte the scancode. The scancode remains the same whatever
       the  state  of  the  shift,  ctrl  and  alt keys, while the ASCII code is affected by shift and ctrl in the normal way (shift changes case,
       ctrl+letter gives the position of that letter in the alphabet, eg. ctrl+A = 1, ctrl+B = 2, etc). Pressing alt+key returns  only  the  scan-
       code, with a zero ASCII code in the low byte. For example:

          int val;
          ...
          val = readkey();
          if ((val & 0xff) == 'd')     /* by ASCII code */
             allegro_message("You pressed 'd'
");

          if ((val >> 8) == KEY_SPACE) /* by scancode */
             allegro_message("You pressed Space
");

          if ((val & 0xff) == 3)       /* ctrl+letter */
             allegro_message("You pressed Control+C
");

          if (val == (KEY_X << 8))     /* alt+letter */
             allegro_message("You pressed Alt+X
");

       This function cannot return character values greater than 255. If you need to read Unicode input, use ureadkey() instead.

SEE ALSO

       install_keyboard(3alleg4), ureadkey(3alleg4), keypressed(3alleg4), clear_keybuf(3alleg4), simulate_keypress(3alleg4)

Allegro                                                            version 4.4.2                                                  readkey(3alleg4)
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