wcswidth: Fix result in case of overflow.stable-202301

* lib/wcswidth-impl.h (wcswidth): Continue searching for a non-printing
wide character after the total width has become > INT_MAX.

2 files changed, 22 insertions, 3 deletions

diff --git a/ChangeLog b/ChangeLog
index d4ab0167f7..73e0f38a3d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2023-05-04  Bruno Haible  <bruno@clisp.org>
+
+	wcswidth: Fix result in case of overflow.
+	* lib/wcswidth-impl.h (wcswidth): Continue searching for a non-printing
+	wide character after the total width has become > INT_MAX.
+
 2023-05-03  Bruno Haible  <bruno@clisp.org>
 
 	vasnprintf: Make '0' flag handling more ISO C compliant.
diff --git a/lib/wcswidth-impl.h b/lib/wcswidth-impl.h
index 606b3bdc1a..ce0b2e0877 100644
--- a/lib/wcswidth-impl.h
+++ b/lib/wcswidth-impl.h
@@ -35,9 +35,22 @@ wcswidth (const wchar_t *s, size_t n)
     }
   return count;
 
+  /* The total width has become > INT_MAX.
+     Continue searching for a non-printing wide character.  */
+  for (; n > 0; s++, n--)
+    {
+      wchar_t c = *s;
+      if (c == (wchar_t)'\0')
+        break;
+      {
+        int width = wcwidth (c);
+        if (width < 0)
+          goto found_nonprinting;
+      }
+     overflow: ;
+    }
+  return INT_MAX;
+
  found_nonprinting:
   return -1;
-
- overflow:
-  return INT_MAX;
 }