#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "quiz.h"
#include "pathnames.h"
static QE qlist;
static int catone, cattwo, tflag;
static u_int qsize;
char *appdstr (char *, char *, size_t);
void downcase (char *);
void err (const char *, ...) __printflike(1, 2) __dead2;
void get_cats (char *, char *);
void get_file (const char *);
char *next_cat (char *);
void quiz (void);
void score (u_int, u_int, u_int);
void show_index (void);
void usage (void) __dead2;
int
main(int argc, char **argv)
{
int ch;
const char *indexfile;
setgid(getgid());
indexfile = _PATH_QUIZIDX;
while ((ch = getopt(argc, argv, "i:t")) != -1)
switch(ch) {
case 'i':
indexfile = optarg;
break;
case 't':
tflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
switch(argc) {
case 0:
get_file(indexfile);
show_index();
break;
case 2:
get_file(indexfile);
get_cats(argv[0], argv[1]);
quiz();
break;
default:
usage();
}
exit(0);
}
void
get_file(const char *file)
{
FILE *fp;
QE *qp;
size_t len;
char *lp;
if ((fp = fopen(file, "r")) == NULL)
err("%s: %s", file, strerror(errno));
qp = &qlist;
qsize = 0;
while ((lp = fgetln(fp, &len)) != NULL) {
if (qp->q_text && qp->q_text[strlen(qp->q_text) - 1] == '\\')
qp->q_text = appdstr(qp->q_text, lp, len);
else {
if ((qp->q_next = malloc(sizeof(QE))) == NULL)
err("%s", strerror(errno));
qp = qp->q_next;
lp[len - 1] = '\0';
if ((qp->q_text = strdup(lp)) == NULL)
err("%s", strerror(errno));
qp->q_asked = qp->q_answered = FALSE;
qp->q_next = NULL;
++qsize;
}
}
fclose(fp);
}
void
show_index(void)
{
QE *qp;
char *p, *s;
FILE *pf;
if ((pf = popen(_PATH_PAGER, "w")) == NULL)
err("%s: %s", _PATH_PAGER, strerror(errno));
fprintf(pf, "Subjects:\n\n");
for (qp = qlist.q_next; qp; qp = qp->q_next) {
for (s = next_cat(qp->q_text); s; s = next_cat(s)) {
if (!rxp_compile(s))
err("%s", rxperr);
if ((p = rxp_expand()) != NULL)
fprintf(pf, "%s ", p);
}
fprintf(pf, "\n");
}
fprintf(pf, "\n%s\n%s\n%s\n",
"For example, \"quiz victim killer\" prints a victim's name and you reply",
"with the killer, and \"quiz killer victim\" works the other way around.",
"Type an empty line to get the correct answer.");
pclose(pf);
}
void
get_cats(char *cat1, char *cat2)
{
QE *qp;
int i;
char *s;
downcase(cat1);
downcase(cat2);
for (qp = qlist.q_next; qp; qp = qp->q_next) {
s = next_cat(qp->q_text);
catone = cattwo = i = 0;
while (s) {
if (!rxp_compile(s))
err("%s", rxperr);
i++;
if (rxp_match(cat1))
catone = i;
if (rxp_match(cat2))
cattwo = i;
s = next_cat(s);
}
if (catone && cattwo && catone != cattwo) {
if (!rxp_compile(qp->q_text))
err("%s", rxperr);
get_file(rxp_expand());
return;
}
}
err("invalid categories");
}
void
quiz(void)
{
QE *qp;
int i;
size_t len;
u_int guesses, rights, wrongs;
int next;
char *answer, *s, *t, question[LINE_SZ];
srandomdev();
guesses = rights = wrongs = 0;
for (;;) {
if (qsize == 0)
break;
next = random() % qsize;
qp = qlist.q_next;
for (i = 0; i < next; i++)
qp = qp->q_next;
while (qp && qp->q_answered)
qp = qp->q_next;
if (!qp) {
qsize = next;
continue;
}
if (tflag && random() % 100 > 20) {
while (qp && (!qp->q_asked || qp->q_answered))
qp = qp->q_next;
if (!qp)
continue;
}
s = qp->q_text;
for (i = 0; i < catone - 1; i++)
s = next_cat(s);
if (!rxp_compile(s))
err("%s", rxperr);
t = rxp_expand();
if (!t || *t == '\0') {
qp->q_answered = TRUE;
continue;
}
strcpy(question, t);
s = qp->q_text;
for (i = 0; i < cattwo - 1; i++)
s = next_cat(s);
if (!rxp_compile(s))
err("%s", rxperr);
t = rxp_expand();
if (!t || *t == '\0') {
qp->q_answered = TRUE;
continue;
}
qp->q_asked = TRUE;
printf("%s?\n", question);
for (;; ++guesses) {
if ((answer = fgetln(stdin, &len)) == NULL) {
score(rights, wrongs, guesses);
exit(0);
}
answer[len - 1] = '\0';
downcase(answer);
if (rxp_match(answer)) {
printf("Right!\n");
++rights;
qp->q_answered = TRUE;
break;
}
if (*answer == '\0') {
printf("%s\n", t);
++wrongs;
if (!tflag)
qp->q_answered = TRUE;
break;
}
printf("What?\n");
}
}
score(rights, wrongs, guesses);
}
char *
next_cat(char *s)
{
for (;;)
switch (*s++) {
case '\0':
return (NULL);
case '\\':
s++;
break;
case ':':
return (s);
}
}
char *
appdstr(char *s, char *tp, size_t len)
{
char *mp, *sp;
char *m;
if ((m = malloc(strlen(s) + len + 1)) == NULL)
err("%s", strerror(errno));
mp = m;
sp = s;
for (; (*mp++ = *sp++););
mp--;
if (*(mp - 1) == '\\')
--mp;
memcpy(mp, tp, len);
mp[len] = '\0';
if (mp[len - 1] == '\n')
mp[len - 1] = '\0';
free(s);
return (m);
}
void
score(u_int r, u_int w, u_int g)
{
printf("Rights %d, wrongs %d,", r, w);
if (g)
printf(" extra guesses %d,", g);
printf(" score %d%%\n", (r + w + g) ? r * 100 / (r + w + g) : 0);
}
void
downcase(char *p)
{
int ch;
for (; (ch = *p); ++p)
if (isascii(ch) && isupper(ch))
*p = tolower(ch);
}
void
usage(void)
{
fprintf(stderr, "quiz [-t] [-i file] category1 category2\n");
exit(1);
}
#include <stdarg.h>
void
err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "quiz: ");
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
