PWB1/sys/source/s2/quiz.c
#include <stdio.h>
#define NF 10
#define NL 300
#define NC 200
#define SL 100
#define NA 10
int tflag;
int xx[NL];
char score[NL];
int rights;
int wrongs;
int guesses;
FILE *input;
int nl 0;
int na NA;
int inc;
int ptr 0;
int nc 0;
char line[150];
char response[100];
char *tmp[NF];
int select[NF];
readline()
{
char *t;
loop:
for(t=line;(*t=getc(input))!=-1;t++) {
nc++;
if(*t==' '&&(t==line||t[-1]==' '))
t--;
if(*t=='\n') {
if(t[-1]=='\\') /*inexact test*/
continue;
while(t>line&&t[-1]==' ')
*--t = '\n';
*++t = 0;
return(1);
}
if(t-line>=NC) {
printf("Too hard for me\n");
do {
*line = getc(input);
if(*line==0377)
return(0);
} while(*line!='\n');
goto loop;
}
}
return(0);
}
char *eu;
char *ev;
cmp(u,v)
{
int x;
eu = u;
ev = v;
x = disj(1);
if(x!=1)
return(x);
return(eat(1,0));
}
disj(s)
{
int t, x;
char *u;
u = eu;
t = 0;
for(;;) {
x = string(s);
if(x>1)
return(x);
switch(*ev) {
case 0:
case ']':
case '}':
return(t|x&s);
case '|':
ev++;
t =| s;
s = 0;
continue;
}
if(s) eu = u;
if(string(0)>1)
return(2);
switch(*ev) {
case 0:
case ']':
return(0);
case '}':
return(1);
case '|':
ev++;
continue;
default:
return(2);
}
}
}
string(s)
{
int x;
for(;;) {
switch(*ev) {
case 0:
case '|':
case ']':
case '}':
return(1);
case '\\':
ev++;
if(*ev==0)
return(2);
if(*ev=='\n') {
ev++;
continue;
}
default:
if(eat(s,*ev)==1)
continue;
return(0);
case '[':
ev++;
x = disj(s);
if(*ev!=']' || x>1)
return(2);
ev++;
if(s==0)
continue;
if(x==0)
return(0);
continue;
case '{':
ev++;
x = disj(s);
if(*ev!='}'||x>1)
return(2);
ev++;
continue;
}
}
}
eat(s,c)
char c;
{
if(*ev!=c)
return(2);
if(s==0) {
ev++;
return(1);
}
if(fold(*eu)!=fold(c))
return(0);
eu++;
ev++;
return(1);
}
fold(c)
char c;
{
if(c<'A'||c>'Z')
return(c);
return(c|040);
}
publish(t)
char *t;
{
ev = t;
pub1(1);
}
pub1(s)
{
for(;;ev++){
switch(*ev) {
case '|':
s = 0;
ev;
continue;
case ']':
case '}':
case 0:
return;
case '[':
case '{':
ev++;
pub1(s);
ev;
continue;
case '\\':
if(*++ev=='\n')
continue;
default:
if(s)
putchar(*ev);
}
}
}
segment(u,w)
char *u, *w[];
{
char *s;
int i;
char *t;
s = u;
for(i=0;i<NF;i++) {
u = s;
t = w[i];
while(*s!=':'&&*s!='\n'&&s-u<SL) {
if(*s=='\\') {
if(s[1] == '\n') {
s =+ 2;
continue;
}
*t++ = *s++;
}
*t++ = *s++;
}
while(*s!=':'&&*s!='\n')
s++;
*t = 0;
if(*s++=='\n') {
return(i+1);
}
}
printf("Too many facts about one thing\n");
}
perm(u,m,v,n,p)
int p[];
char *u[], *v[];
{
int i, j;
int x;
for(i=0;i<m;i++) {
for(j=0;j<n;j++) {
x = cmp(u[i],v[j]);
if(x>1) badinfo();
if(x==0)
continue;
p[i] = j;
goto uloop;
}
return(0);
uloop: ;
}
return(1);
}
find(u,m)
char *u[];
{
int n;
while(readline()){
n = segment(line,tmp);
if(perm(u,m,tmp+1,n-1,select))
return(1);
}
return(0);
}
readindex()
{
xx[0] = nc = 0;
while(readline()) {
xx[++nl] = nc;
if(nl>=NL) {
printf("I've forgotten some of it;\n");
printf("I remember %d items.\n", nl);
break;
}
}
}
talloc()
{
int i;
for(i=0;i<NF;i++)
tmp[i] = alloc(SL);
}
main(argc,argv)
char *argv[];
{
register j;
int i;
int x;
int z;
char *info;
int tvec[2];
char *t;
extern done();
int count;
info = "/usr/lib/quiz/index";
time(tvec);
inc = tvec[1]&077774|01;
loop:
if(argc>1&&*argv[1]=='-') {
switch(argv[1][1]) {
case 'i':
if(argc>2)
info = argv[2];
argc =- 2;
argv =+ 2;
goto loop;
case 't':
tflag = 1;
argc--;
argv++;
goto loop;
}
}
input = fopen(info,"r");
if(input==NULL) {
printf("No info\n");
exit(0);
}
talloc();
if(argc<=2)
instruct(info);
signal(2,done);
argv[argc] = 0;
if(find(&argv[1],argc-1)==0)
dunno();
fclose(input);
input = fopen(tmp[0],"r");
if(input==NULL)
dunno();
readindex();
if(!tflag || na>nl)
na = nl;
for(;;) {
i = next();
fseek(input,xx[i]+0L,0);
z = xx[i+1]-xx[i];
for(j=0;j<z;j++)
line[j] = getc(input);
segment(line,tmp);
if(*tmp[select[0]] == '\0' || *tmp[select[1]] == '\0') {
score[i] = 1;
continue;
}
publish(tmp[select[0]]);
printf("\n");
for(count=0;;count++) {
if(query(response)==0) {
publish(tmp[select[1]]);
printf("\n");
if(count==0) wrongs++;
score[i] = tflag?-1:1;
break;
}
x = cmp(response,tmp[select[1]]);
if(x>1) badinfo();
if(x==1) {
printf("Right!\n");
if(count==0) rights++;
if(++score[i]>=1 && na<nl)
na++;
break;
}
printf("What?\n");
if(count==0) wrongs++;
score[i] = tflag?-1:1;
}
guesses =+ count;
}
}
query(r)
char *r;
{
char *t;
for(t=r;;t++) {
if(read(0,t,1)==0)
done();
if(*t==' '&&(t==r||t[-1]==' '))
t--;
if(*t=='\n') {
while(t>r&&t[-1]==' ')
*--t = '\n';
break;
}
}
*t = 0;
return(t-r);
}
next()
{
int flag;
inc = inc*3125&077777;
ptr = (inc>>2)%na;
flag = 0;
while(score[ptr]>0)
if(++ptr>=na) {
ptr = 0;
if(flag) done();
flag = 1;
}
return(ptr);
}
done()
{
printf("\nRights %d, wrongs %d, ", rights, wrongs);
if(guesses)
printf("extra guesses %d, ", guesses);
printf("score %d%%\n",100*rights/(rights+wrongs));
exit(0);
}
instruct(info)
{
char *t;
int i, n;
printf("Subjects:\n\n");
while(readline()) {
printf("-");
n = segment(line,tmp);
for(i=1;i<n;i++) {
printf(" ");
publish(tmp[i]);
}
printf("\n");
}
printf("\n");
input = fopen(info,"r");
if(input==NULL)
abort();
readline();
segment(line,tmp);
printf("For example,\n");
printf(" quiz ");
publish(tmp[1]);
printf(" ");
publish(tmp[2]);
printf("\nasks you a ");
publish(tmp[1]);
printf(" and you answer the ");
publish(tmp[2]);
printf("\n quiz ");
publish(tmp[2]);
printf(" ");
publish(tmp[1]);
printf("\nworks the other way around\n");
printf("\nType empty line to get correct answer.\n");
exit(0);
}
badinfo(){
printf("Bad info %s\n",line);
}
dunno()
{
printf("I don't know about that\n");
exit(0);
}