pgate.c

这是一个使用了 cursor 编程技术实现的车站自动售票系统的源代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<fcntl.h>
#include<signal.h>
#include<curses.h>
#include<malloc.h>

#define	MAXGAT	100
#define	ROWS	15
#define	ROW	5
#define	INROW	22
#define	MSGROW	23
#define	NITEM	2

struct	gate{
	int	no;
	char	tty[10];
}gat[MAXGAT];
int	ngat;
int	order[MAXGAT];
int	delf[MAXGAT];
int	col[NITEM]={30,40};
char	*title[NITEM]={"编号","终端"};

char	*tab[]={"检 票 口 信 息 管 理",
		"----------------------------------------"
		"---------------------------------------",
		"Q-退出  A-添加  M-修改  D-删除  U-恢复 S-保存  R-排序"
	};

enum	Key{
	NONE,Up,Down,Right,Left,Center,End,PgDn,Home,
	PgUp,Ins,F1,F2,F3,F4,F5,F6,F7,F8,F9,F10,F11,F12
};

char	*RP;

main(int argc,char *argv[])
{
	char	c;
	int	flag=0;
	int	quit=0;
	int	sgat,pgat;
	int	n;

	RP=getenv("ROOTPATH");
	if(RP==NULL)
		return	-1;

	init();
	if((ngat=readgat())!=-1)
	{
		sgat=0;
		pgat=0;
		sort();
		for(n=0;n<ngat;n++)
			delf[n]=0;
	}
	else
		ngat=0;
	while(quit==0)
	{
		show(sgat,pgat);
		move(ROW+ROWS+1,41+strlen(tab[2])/2);
		refresh();
		c=getkey();
		clrin();
		clrmsg();
		if(c>='A'&&c<='Z')
			c=c-'A'+'a';
		switch(c)
		{
			case	-1:
				break;
			case	Down:
				if(pgat<ngat-1)
					pgat++;
				if(pgat-sgat>=ROWS)
					sgat++;
				break;
			case	Up:
				if(pgat>0)
					pgat--;
				if(pgat<sgat&&sgat>0)
					sgat--;
				break;
			case	PgUp:
				if(sgat>=ROWS)
					sgat-=ROWS;
				else
					sgat=0;
				if(pgat>=ROWS)
					pgat-=ROWS;
				else
					pgat=0;
				break;
			case	PgDn:
				if(sgat<ngat-ROWS)
					sgat+=ROWS;
				if(pgat<ngat-ROWS)
					pgat+=ROWS;
				else
					pgat=ngat-1;
				break;
			case	Home:
				sgat=0;
				pgat=0;
				break;
			case	End:
				if(ngat%ROWS==0)
					sgat=ngat-ROWS;
				else
					sgat=ngat-ngat%ROWS;
				pgat=ngat-1;
				break;
			case	'a':
				if(append()==0)
					flag=1;
				if(ngat%ROWS==0)
					sgat=ngat-ROWS;
				else
					sgat=ngat-ngat%ROWS;
				pgat=ngat-1;
				break;
			case	'm':
				if(modify(sgat,pgat)==0)
					flag=1;
				break;
			case	'd':
				if(delete(sgat,pgat)==0)
					flag=1;
				break;
			case	'u':
				if(undelete(sgat,pgat)==0)
					flag=1;
				break;
			case	's':
				if(save()==0)
					flag=0;
				break;
			case	'r':
				sort();
				break;
			case	'q':
				if(flag==0)
					quit=1;
				else
					if(save()==0)
						quit=1;
					else
						if(yn("fail to save, quit(y/n)? ")==0)
							quit=1;
				break;
			default:
				printf("\07");
				break;
		}
	}
	erase();
	clear();
	refresh();
	endwin();
}

init()
{
	int	i;

	signal(SIGINT,SIG_IGN);
	initscr();
	raw();
	nonl();
	noecho();

	clear();
	mvaddstr(ROW-4,40-strlen(tab[0])/2,tab[0]);
	for(i=0;i<NITEM;i++)
		mvaddstr(ROW-2,col[i],title[i]);
	mvaddstr(ROW-1,0,tab[1]);
	mvaddstr(ROW+ROWS,0,tab[1]);
	mvaddstr(ROW+ROWS+1,40-strlen(tab[2])/2,tab[2]);
	refresh();
}

int	readgat()
{
	char	fn[80];
	char	msg[128];
	int	fd;
	long	size;

	sprintf(fn,"%s/bas/gate.dat",RP);
	fd=open(fn,O_RDONLY);
	if(fd==-1)
	{
		sprintf(msg,"文件%s打开失败!",fn);
		showmsg(msg);
		return	0;
	}
	else
	{
		size=lseek(fd,0L,2);
		if(size>MAXGAT*sizeof(struct gate))
			size=MAXGAT*sizeof(struct gate);
		lseek(fd,0L,0);
		read(fd,(char *)gat,size);
		close(fd);
		return	size/sizeof(struct gate);
	}
}

sort()
{
	int	i,j,k,n;

	for(i=0;i<ngat;i++)
		order[i]=i;
	k=ngat/2;
	while(k>0)
	{
		for(j=k;j<ngat;j++)
		{
			n=order[j];
			i=j-k;
			while(i>=0&&gat[order[i]].no>gat[n].no)
			{
				order[i+k]=order[i];
				i-=k;
			}
			order[i+k]=n;
		}
		k/=2;
	}
}

int	append()
{
	int	i,j,n;
	int	no;
	char	tty[10];
	int	sgat,pgat;

	sgat=ngat-ngat%ROWS;
	i=0;
	while(1)
	{
		ngat++;
		if(ngat>=MAXGAT)
		{
			showmsg("空间已满, 不能再增加!");
			break;
		}
		pgat=ngat-1;
		order[pgat]=pgat;
		if(ngat>1)
			no=gat[order[pgat-1]].no+1;
		else
			no=0;
		tty[0]='\0';
		gat[order[pgat]].no=no;
		gat[order[pgat]].tty[0]='\0';
		if(pgat-sgat>=ROWS)
			sgat++;
		show(sgat,pgat);

		while(1)
		{
			if((n=get_n(pgat-sgat+ROW,col[0],"",&no,5))==-1)
				break;
			for(j=0;j<ngat-1&&no!=gat[j].no;j++)
				;
			if(j<ngat-1)
				showmsg("此车主号有重复!");
			else
				break;
		}
		if(n==-1)
			break;

		if(get_s(pgat-sgat+ROW,col[1],"",tty,50)==-1)
			break;

		gat[pgat].no=no;
		strcpy(gat[pgat].tty,tty);
		i++;
	}
	move(pgat-sgat+ROW,0);
	clrtoeol();
	refresh();
	if(i>0)
		return	i;
	else
		return	-1;
}

int	modify(int sgat,int pgat)
{
	char	tty[10];

	strcpy(tty,gat[order[pgat]].tty);
	if(get_s(pgat-sgat+ROW,col[1],"",tty,50)==-1)
		return	-1;

	strcpy(gat[order[pgat]].tty,tty);
	return	0;
}

int	delete(int sgat,int pgat)
{
	if(ngat<=0)
		return	-1;
	if(delf[order[pgat]]==0)
	{
		delf[order[pgat]]=1;
		mvaddch(pgat-sgat+ROW,col[0]-1,'*');
		refresh();
		return	0;
	}
	else
		return	-1;
}

int	undelete(int sgat,int pgat)
{
	if(ngat<=0)
		return	-1;
	if(delf[order[pgat]]==0)
		return	-1;
	else
	{
		delf[order[pgat]]=0;
		mvaddch(pgat-sgat+ROW,col[0]-1,' ');
		refresh();
		return	0;
	}
}

int	save()
{
	char	fn[80];
	char	msg[128];
	int	fd;
	long	size;
	int	i;

	sprintf(fn,"%s/bas/gate.dat",RP);
	fd=open(fn,O_WRONLY|O_TRUNC);
	if(fd==-1)
	{
		fd=open(fn,O_CREAT|O_WRONLY,0666);
		if(fd==-1)
		{
			sprintf(msg,"文件%s打开失败!",fn);
			showmsg(msg);
			return	-1;
		}
	}
	size=sizeof(struct gate);
	for(i=0;i<ngat;i++)
		if(delf[i]==0)
			write(fd,(char *)(gat+i),size);
	close(fd);
	return	0;
}

int	get_n(int y,int x,char *prompt,int *n,int b)
{
	char	c,ss[128];
	int	i;

	sprintf(ss,"%d",*n);
	for(i=strlen(ss);i<b-1;i++)
		ss[i]=' ';
	ss[b-1]='\0';
	mvaddstr(y,x,prompt);
	x+=strlen(prompt);
	mvaddstr(y,x,ss);
	refresh();

	i=0;
	while(1)
	{
		move(y,x+i);
		refresh();
		if(i>=b-1)
			c=0x0d;
		else
			c=getkey();
		switch(c)
		{
			case 	0x1b:		/* <ESC> pressed */
				return	-1;
			case	0x0d:		/* <ENTER> pressed */
				if(i)
					*n=atoi(ss);
				return	0;
			case	0x08:		/* <BS> pressed */
				if(i<=0)
					continue;
				else
				{
					ss[--i]=' ';
					ss[i]='\0';
				}
				break;
			case	'0':
			case	'1':
			case	'2':
			case	'3':
			case	'4':
			case	'5':
			case	'6':
			case	'7':
			case	'8':
			case	'9':
				ss[i++]=c;
				ss[i]='\0';
				break;
			default:
				printf("\7\7");
				break;
		}
		mvaddstr(y,x,ss);
		refresh();
	}
}

int	get_s(int y,int x,char prompt[],char s[],int n)
	/* x,y  location of cursor; s  the string  */
	/* n  length of s; */
{
	char	c,ss[128];
	int	i;

	strcpy(ss,s);
	for(i=strlen(ss);i<n-1;i++)
		ss[i]=' ';
	ss[n-1]='\0';
	mvaddstr(y,x,prompt);
	x+=strlen(prompt);
	mvaddstr(y,x,ss);
	refresh();

	i=0;
	while(1)
	{
		move(y,x+i);
		refresh();
		if(i>=n-1)
			c=0x0d;
		else
			c=getkey();
		switch(c)
		{
			case 	0x1b:		/* <ESC> pressed */
				return	-1;
			case	0x0d:		/* <ENTER> pressed */
				if(i)
					strcpy(s,ss);
				return	0;
			case	0x08:		/* <BS> pressed */
				if(i<=0)
					continue;
				else
				{
					ss[--i]=' ';
					ss[i]='\0';
				}
				break;
			default:
				ss[i++]=c;
				ss[i]='\0';
				break;
		}
		mvaddstr(y,x,ss);
		refresh();
	}
}

getkey()
{
	char	c,key;
	char	keys[]={Up,Down,Right,Left,NONE,End,PgDn,Home,
		PgUp,NONE,NONE,Ins};
	void	timeint();

	sigset(SIGALRM,timeint);
	key=getch();
	refresh();
	if(key==0x1b)
	{
		alarm(1);
		if(getch()!=-1)
		{
			c=getch();
			refresh();
			key=keys[c-'A'];
		}
	}
	sigignore(SIGALRM);
	return	key;
}

void	timeint()
{
}

show(int sgat,int pgat)
{
	static	int	n=-1;
	static	int	s=-1;
	static	int	p=-1;
	static	int	o[ROWS];
	int	i;

	move(2,70);
	clrtoeol();
	if(ngat>0)
		mvprintw(2,70,"%d/%d",pgat+1,ngat);
	else
	{
		mvaddstr(2,70,"0/0");
		clrscr();
		refresh();
		return;
	}

	mvaddch(p-s+ROW,col[0]-2,' ');
	if(p!=pgat)
		p=pgat;
	for(i=0;i<ROWS&&s+i<ngat&&o[i]==order[s+i];i++)
		;
	if((n!=ngat&&(p-s)>=ROWS)||s!=sgat||(i<ROWS&&s+i<ngat))
	{
		n=ngat;
		s=sgat;
		clrscr();
		for(i=0;i<ROWS&&(s+i)<ngat;i++)
		{
			o[i]=order[s+i];
			showone(ROW+i,o[i]);
		}
	}
	else
	{
		move(p-s+ROW,0);
		clrtoeol();
		showone(p-s+ROW,order[p]);
	}
	mvaddch(p-s+ROW,col[0]-2,'>');
	refresh();
}

showone(int row,int n)
{
	if(delf[n])
		mvaddch(row,col[0]-1,'*');
	move(row,col[0]);
	printw("%d",gat[n].no);
	mvaddstr(row,col[1],gat[n].tty);
	refresh();
}

clrscr()
{
	int	i;

	for(i=0;i<ROWS;i++)
	{
		move(ROW+i,0);
		clrtoeol();
	
	}
	refresh();
}

showmsg(char s[])
{
	move(MSGROW,0);
	clrtoeol();
	mvaddstr(MSGROW,(80-strlen(s))/2,s);
	refresh();
	printf("\7\7");
}

clrmsg()
{
	move(MSGROW,0);
	clrtoeol();
	refresh();
}

clrin()
{
	move(INROW,0);
	clrtoeol();
	refresh();
}

int	yn(char *p)
{
	char	c;

	do{
		move(INROW,0);
		clrtoeol();
		mvprintw(INROW,40-strlen(p)/2,p);
		move(INROW,41+strlen(p)/2);
		refresh();
		c=getkey();
	}while(c!='y'&&c!='Y'&&c!='n'&&c!='N');
	if(c>='A'&&c<='Z')
		c=c-'A'+'a';
	if(c=='y')
		return	0;
	else
		return	1;
}