1 files changed, 5 insertions, 0 deletions
diff --git a/mpfr.c b/mpfr.c
index b239e4b6..cd929d4c 100644
--- a/mpfr.c
+++ b/mpfr.c
@@ -275,6 +275,7 @@ static int
 force_mpnum(NODE *n, int do_nondec, int use_locale)
 {
 	char *cp, *cpend, *ptr, *cp1;
+	char save;
 	int tval, base = 10;
 
 	if (n->stlen == 0) {
@@ -291,6 +292,9 @@ force_mpnum(NODE *n, int do_nondec, int use_locale)
 		return false;
 	}
 
+	save = *cpend;
+	*cpend = '\0';
+
 	if (*cp == '+' || *cp == '-')
 		cp1 = cp + 1;
 	else
@@ -325,6 +329,7 @@ done:
 	/* trailing space is OK for NUMBER */
 	while (ptr < cpend && isspace((unsigned char) *ptr))
 		ptr++;
+	*cpend = save;
 	if (errno == 0 && ptr == cpend)
 		return true;
 	errno = 0;