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quiz: handle line continuation in data files correctly, switch to getline(3)

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Specifically, the following quiz.db line

foo:\
bar

was parsed into "foo:bar\n", which made it impossible to answer correctly.

Bug reported and inital fix from Alex Karle, partially reworked by
yours truly, further input from millert@
This commit is contained in:
naddy 2021-03-11 21:18:25 +00:00
parent 6e9d372769
commit 5a0076c3c8
1 changed files with 24 additions and 40 deletions
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64
games/quiz/quiz.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: quiz.c,v 1.30 2018/08/24 11:14:49 mestre Exp $ */
/* $OpenBSD: quiz.c,v 1.31 2021/03/11 21:18:25 naddy Exp $ */
/* $NetBSD: quiz.c,v 1.9 1995/04/22 10:16:58 cgd Exp $ */
/*-
@ -48,7 +48,6 @@ static QE qlist;
static int catone, cattwo, tflag;
static u_int qsize;
char *appdstr(char *, const char *, size_t);
void downcase(char *);
void get_cats(char *, char *);
void get_file(const char *);
@ -110,7 +109,8 @@ get_file(const char *file)
{
FILE *fp;
QE *qp;
size_t len;
ssize_t len;
size_t qlen, size;
char *lp;
if ((fp = fopen(file, "r")) == NULL)
@ -123,26 +123,36 @@ get_file(const char *file)
*/
qp = &qlist;
qsize = 0;
while ((lp = fgetln(fp, &len)) != NULL) {
qlen = 0;
lp = NULL;
size = 0;
while ((len = getline(&lp, &size, fp)) != -1) {
if (lp[len - 1] == '\n')
--len;
if (qp->q_text && qp->q_text[0] != '\0' &&
qp->q_text[strlen(qp->q_text) - 1] == '\\')
qp->q_text = appdstr(qp->q_text, lp, len);
else {
lp[--len] = '\0';
if (qp->q_text)
qlen = strlen(qp->q_text);
if (qlen > 0 && qp->q_text[qlen - 1] == '\\') {
qp->q_text[--qlen] = '\0';
qlen += len;
qp->q_text = realloc(qp->q_text, qlen + 1);
if (qp->q_text == NULL)
errx(1, "realloc");
strlcat(qp->q_text, lp, qlen + 1);
} else {
if ((qp->q_next = malloc(sizeof(QE))) == NULL)
errx(1, "malloc");
qp = qp->q_next;
if ((qp->q_text = malloc(len + 1)) == NULL)
errx(1, "malloc");
/* lp may not be zero-terminated; cannot use strlcpy */
strncpy(qp->q_text, lp, len);
qp->q_text[len] = '\0';
qp->q_text = strdup(lp);
if (qp->q_text == NULL)
errx(1, "strdup");
qp->q_asked = qp->q_answered = FALSE;
qp->q_next = NULL;
++qsize;
}
}
free(lp);
if (ferror(fp))
err(1, "getline");
(void)fclose(fp);
}
@ -318,32 +328,6 @@ next_cat(const char *s)
}
}
char *
appdstr(char *s, const char *tp, size_t len)
{
char *mp;
const char *sp;
int ch;
char *m;
if ((m = malloc(strlen(s) + len + 1)) == NULL)
errx(1, "malloc");
for (mp = m, sp = s; (*mp++ = *sp++) != '\0'; )
;
--mp;
if (*(mp - 1) == '\\')
--mp;
while ((ch = *mp++ = *tp++) && ch != '\n')
;
if (*(mp - 2) == '\\')
mp--;
*mp = '\0';
free(s);
return (m);
}
void
score(u_int r, u_int w, u_int g)
{