c언어 코딩 중 도저히 이해가 안갑니다

#include "worker.h"
#include "pmenu.h"
#include <ncurses.h>
#include <unistd.h>
void workerselect() {
    int stat = 0;
    int ch;
    keypad(stdscr, TRUE);
    noecho();
    while (1) {
        ch = getch();
        if (ch == 10) {
            if (stat == 0) {
                chdir("1p");
                ppselect();
                chdir("..");
            } else if (stat == 1) {
                chdir("2p");
                ppselect();
                chdir("..");
            } else if (stat == 2) {
                chdir("3p");
                ppselect();
                chdir("..");
            } else if (stat == 3) {
                chdir("driver");
 
            }
        }
        if (stat == 0) {
            if (ch == KEY_RIGHT) {
                pp2();
                stat = 1;
            } else if (ch == KEY_DOWN) {
                pp3();
                stat = 2;
            }
        } else if (stat == 1) {
            if (ch == KEY_LEFT) {
                pp1();
                stat = 0;
            } else if (ch == KEY_DOWN) {
                driver();
                stat = 3;
            }
        } else if (stat == 2) {
            if (ch == KEY_UP) {
                pp1();
                stat = 0;
            } else if (ch == KEY_RIGHT) {
                driver();
                stat = 3;
            }
        } else if (stat == 3) {
            if (ch == KEY_LEFT) {
                pp3();
                stat = 2;
            } else if (ch == KEY_UP) {
                pp2();
                stat = 1;
            }
        }
    }
}

#ifndef __PMENU_H__
#define __PMENU_H__
void pinit();
void pmanage();
void pexit();
void ppselect();
#endif

#include"pmenu.h"
#include<ncurses.h>
void ppselect()
{
    int stat=0;
    int ch;
    keypad(stdscr, TRUE);
    pinit();
    noecho();
    while(1)
    {
        ch = getch();
        if(ch == 10)
        {
            if(stat == 0)
            {
                break;
            }
        }
        else if(stat == 0)
        {
            if(ch == KEY_RIGHT)
            {
                stat = 1;
                pmanage();
            }
        }
        else if(stat == 1)
        {
            if(ch == KEY_RIGHT)
            {
                stat = 2;
                pexit();
            }
            else if(ch == KEY_LEFT)
            {
                stat = 0;
                pinit();
            }
        }
        else if(stat == 2)
        {
            if(ch == KEY_LEFT)
            {
                stat = 1;
                pmanage();
            }
        }
    }
}

main.out: main.o initmenu.o menu.o worker.o
	gcc -o main.out main.o initmenu.o menu.o worker.o -lncurses
 
main.o: initmenu.h menu.h worker.h main.c
	gcc -c main.c -lncurses
 
initmenu.o: initmenu.h initmenu.c
	gcc -c initmenu.c -lncurses
 
worker.o: worker.h pmenu.h worker.c
	gcc -c worker.c pmenu.c -lncurses
 
menu.o: menu.h worker.h menu.c
	gcc -c menu.c
 
clean:
	rm -f *.o