Linux Snake Game curses library 1.0

This version is a beta version, and some details need to be improved, but the game is ready and there are no obvious bugs.

/**************************************************************************** * snake.c * * Author:SamBrown *  * * Implements the game of Snake. ***************************************************************************/#include<stdio.h>#include<stdlib.h>#include<curses.h>#include<sys/time.h>#include<signal.h>#include <unistd.h>#include <ctype.h>#include <stdbool.h>#include <stdlib.h>#include <string.h>#include <time.h>#define Start_Error "Error starting up ncurses!\n"#define ICON_FOOD '*'#define ICON_BUG '#'#define ICON_SNAKE '@'#define CRASH_WALL 1#define CRASH_ITSELF 2#define WIN 3#define BLANK ' '#define ARGC_ERR "your input is wrong, eg: ./snake 2"typedef struct Snake{        int x, y;        struct Snake * next;        struct Snake * pre;}Snake;typedef struct Food_Pos{        int x, y;}Food;int a = 1, b= 1;Food food;int dirx, diry;int speed = 2, control = 2;int length;Snake *head;Snake *tail;bool Start();//okvoid Init();//okvoid F_Dis();//okvoid S_Init();//okvoid S_Move();//ok     void S_Insert( int y, int x );//okvoid S_Delete();//okint Set_ticker( int n_msecs );//okvoid Key_Control();//okvoid S_Free();//okvoid End();                //okvoid gameover( int n );    //okint main( int argc, char * argv[] ) {if( argc != 2 ){fprintf( stderr, ARGC_ERR );exit( 0 );}if( strcmp( argv[1], "1" ) != 0  ){fprintf( stderr, "sorry, we just support one player now" );exit( 0 );}    if( !Start() )             {        fprintf(stderr, Start_Error );        return 0;    }    Init();                 F_Dis();                    S_Init();                     signal( SIGALRM, S_Move );    Set_ticker( 50 );    Key_Control();    End();        return 0;}void S_Move( ){ char c;     int move = 0;     signal(SIGALRM, SIG_IGN);          /* Crash Wall   */     if( (head->y+diry <= 1 && diry == -1) ||         (head->y+diry >= LINES && diry == 1 ) ||         (head->x+dirx <= 1 && dirx == -1 ) ||         (head->x+dirx >=COLS && dirx == 1 )        )       gameover( CRASH_ITSELF );            /* Crash itself */ c = mvinch( head->y+diry, head->x+dirx ); mvprintw( 0, 0, "%c", c );     if( c == '@' )       gameover( CRASH_ITSELF ); if( speed > 0 && control-- == 1 ) {S_Insert( head->y+diry, head->x+dirx );/* reset the speed of the snake */control = speed;move = 1; }     if( move )     {         /* Eat the Food */             if( head->y == food.y &&  head->x == food.x )         {             length++;             if( length > 20 )                 gameover( WIN ); F_Dis();         }         else         {             mvaddch( tail->y, tail->x, ' ' );             S_Delete( );                 }    /* refresh */ mvaddch( head->y, head->x, ICON_SNAKE ); refresh(); } signal( SIGALRM, S_Move );}void gameover(int n){switch( n ){case WIN: mvaddstr(LINES / 2, COLS / 3 - 4, "Mission Completes,press any key to exit.\n");break;case CRASH_WALL:mvaddstr(LINES/2, COLS/3 - 4, "Game Over, crash the wall,press any key to exit.\n");break;case CRASH_ITSELF:mvaddstr(LINES/2, COLS/3 - 4, "Game Over, crash yourself,press any key to exit.\n");break;default:break;}refresh();/* delete the whole double linked list */End();}void S_Free(){     Snake *temp;     Snake *ne;     temp = head;     while( temp != tail )     {            ne = temp->pre;            free( temp );            temp = ne;     }     free( tail );}void S_Insert( int y, int x ){     Snake * temp = (Snake *)malloc( sizeof(Snake) );     if( temp == NULL )         perror( "malloc error" );     temp->x = x;     temp->y = y;     head->next = temp;     temp->pre = head;     temp->next = NULL;     head = temp; }void S_Delete(){     Snake *temp;     temp = tail->next;     tail->next = NULL; free( tail );     tail = temp;}void End(){    /* turn off the timer */S_Free();    Set_ticker(0);getchar();endwin();exit(0);}void Key_Control(){     int key;     keypad( stdscr, true );     while( key = getch() , key != 'q' )     {            switch( key )            {                    case KEY_LEFT:                         if( length > 1 && dirx == 1 && diry == 0 )                             continue;                         dirx = -1;                         diry = 0; break;                    case KEY_RIGHT:                         if( length > 1 && dirx == -1 && diry == 0 )                             continue;                         dirx = 1;                         diry = 0;                         break;                    case KEY_UP:                         if( length > 1 && dirx == 0 && diry == 1 )                             continue;                         dirx = 0;                         diry = -1;                         break;                    case KEY_DOWN:                         if( length > 1 && dirx == 0 && diry == -1 )                             continue;                         dirx = 0;                         diry = 1;                         break;            }      }}int Set_ticker(int n_msecs){struct itimerval new_timeset;long n_sec, n_usecs;n_sec = n_msecs / 1000;/* int second part */n_usecs = (n_msecs % 1000) * 1000L;/* microsecond part */new_timeset.it_interval.tv_sec = n_sec;/* set reload */new_timeset.it_interval.tv_usec = n_usecs;new_timeset.it_value.tv_sec = n_sec;/* set new ticker value */new_timeset.it_value.tv_usec = n_usecs;return setitimer(ITIMER_REAL, &new_timeset, NULL);}void S_Init(){     dirx = 1;     diry = 0;     /* At the beginning the length of snake is 1 */     length = 1;     Snake *temp = ( Snake* )malloc( sizeof(Snake) );     if( temp == NULL )         perror("malloc");     temp->x = 5;     temp->y = 10;     head = temp; tail = temp;     temp->next = NULL;     temp->pre = NULL;     mvaddch(temp->y, temp->x, ICON_SNAKE );     refresh();}void Init(){   /* the init interface */     mvprintw( LINES/2, COLS/2, "The Snake...\n" ); mvprintw( LINES/2+1, COLS/2, "Author:SamBrown\n" ); mvprintw( LINES/2+2, COLS/2, "<-^->  Control\n " ); mvprintw( LINES/2+3, COLS/2, "press any key to continue...\n"); getch(); clear();}void F_Dis(){       srand(time(0));food.x = rand() % (COLS-5);food.y = rand() % (LINES-5);//food.x = 20;//food.y = 10;mvaddch(food.y, food.x, ICON_FOOD);/* display the food */refresh();}bool Start( ){    // initialize ncurses    if (initscr() == NULL)        return false;    // prepare for color if possible    if (has_colors())    {        // enable color        if (start_color() == ERR || attron(A_PROTECT) == ERR)        {            endwin();            return false;        }        }    // don't echo keyboard input    if ( noecho() == ERR )    {        endwin();        return false;    }    // disable line buffering and certain signals    if ( raw() == ERR )    {        endwin();        return false;    }    // enable arrow keys    if (keypad(stdscr, true) == ERR)    {        endwin();        return false;    }       /* set cursor invisible */    curs_set(0);crmode();     // wait 1000 ms at a time for input    timeout(1000);    // w00t    return true;}