track valid exception flags when calling fegetexceptflag() and check when calling fesetexceptflag()

1 files changed, 9 insertions, 1 deletions

diff --git a/src/fenv/fegetexceptflag.c b/src/fenv/fegetexceptflag.c
index 921dc1b8..ef8517f9 100644
--- a/src/fenv/fegetexceptflag.c
+++ b/src/fenv/fegetexceptflag.c
@@ -5,7 +5,15 @@ int fegetexceptflag(fexcept_t *flagp, int excepts)
 {
 	SIGNAL_SAFE(0);
 	ASSERT_VALID_EXCEPTION_MASK(excepts);
-	(void)flagp; (void)excepts;
+	if (!(flagp->__impl >= __fenv_h.fexcept && flagp->__impl <= __fenv_h.fexcept + __fenv_h.nfexcept)) {
+		struct __fexcept_t *tmp = realloc(__fenv_h.fexcept, sizeof(*__fenv_h.fexcept) * (__fenv_h.nfexcept + 1));
+		if (tmp == NULL) {
+			abort();
+		}
+		__fenv_h.fexcept = tmp;
+		flagp->__impl = &(__fenv_h.fexcept[__fenv_h.nfexcept++]);
+	}
+	flagp->__impl->mask = excepts;
 	return 0;
 }