LibC: Implement wcswidth

gmbows · Jun 30, 2022 · 6d4d6c3 · 6d4d6c3
1 parent 9497cc6
commit 6d4d6c3
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diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
@@ -531,6 +531,23 @@ int wcwidth(wchar_t wc)
     return 1;
 }
 
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcswidth.html
+int wcswidth(wchar_t const* pwcs, size_t n)
+{
+    int len = 0;
+
+    for (size_t i = 0; i < n && pwcs[i]; i++) {
+        int char_len = wcwidth(pwcs[i]);
+
+        if (char_len == -1)
+            return -1;
+
+        len += char_len;
+    }
+
+    return len;
+}
+
 // https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcsnrtombs.html
 size_t wcsnrtombs(char* dest, wchar_t const** src, size_t nwc, size_t len, mbstate_t* ps)
 {

diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
@@ -63,6 +63,7 @@ float wcstof(wchar_t const*, wchar_t**);
 double wcstod(wchar_t const*, wchar_t**);
 long double wcstold(wchar_t const*, wchar_t**);
 int wcwidth(wchar_t);
+int wcswidth(wchar_t const*, size_t);
 size_t wcsrtombs(char*, wchar_t const**, size_t, mbstate_t*);
 size_t mbsrtowcs(wchar_t*, char const**, size_t, mbstate_t*);
 int wmemcmp(wchar_t const*, wchar_t const*, size_t);