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-rw-r--r--libc/misc/wchar/wchar.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/libc/misc/wchar/wchar.c b/libc/misc/wchar/wchar.c
index 23638ea8f..a28cd8f94 100644
--- a/libc/misc/wchar/wchar.c
+++ b/libc/misc/wchar/wchar.c
@@ -1143,6 +1143,13 @@ int wcswidth(const wchar_t *pwcs, size_t n)
{
int count;
wchar_t wc;
+ size_t i;
+
+ for (i = 0 ; (i < n) && pwcs[i] ; i++) {
+ if (pwcs[i] != (pwcs[i] & 0x7f)) {
+ return -1;
+ }
+ }
for (count = 0 ; n && (wc = *pwcs++) ; n--) {
if (wc <= 0xff) {