1 files changed, 56 insertions, 0 deletions
diff --git a/newlib/libc/string/wcswidth.c b/newlib/libc/string/wcswidth.c
new file mode 100644
index 000000000..bd3d9bbad
--- /dev/null
+++ b/newlib/libc/string/wcswidth.c
@@ -0,0 +1,56 @@
+/*
+FUNCTION
+	<<wcswidth>>---number of column positions of a wide-character string
+	
+INDEX
+	wcswidth
+
+ANSI_SYNOPSIS
+	#include <wchar.h>
+	int wcswidth(const wchar_t *<[pwcs]>, size_t <[n]>);
+
+TRAD_SYNOPSIS
+	#include <wchar.h>
+	int wcswidth(<[pwcs]>, <[n]>)
+	wchar_t *<[wc]>;
+	size_t <[n]>;
+
+DESCRIPTION
+	The <<wcswidth>> function shall determine the number of column
+	positions required for n wide-character codes (or fewer than n
+	wide-character codes if a null wide-character code is encountered
+	before n wide-character codes are exhausted) in the string pointed
+	to by pwcs.
+
+RETURNS
+	The <<wcswidth>> function either shall return 0 (if pwcs points to a
+	null wide-character code), or return the number of column positions
+	to be occupied by the wide-character string pointed to by pwcs, or
+	return -1 (if any of the first n wide-character codes in the
+	wide-character string pointed to by pwcs is not a printable
+	wide-character code).
+
+PORTABILITY
+<<wcswidth>> has been introduced in the Single UNIX Specification Volume 2
+<<wcswidth>> has been marked as extension in Single UNIX Specification Volume 3
+*/
+
+#include <_ansi.h>
+#include <wchar.h>
+
+int
+_DEFUN (wcswidth, (pwcs, n),
+	_CONST wchar_t *pwcs _AND
+	size_t n)
+
+{
+  int w, len = 0;
+  if (!pwcs || n == 0)
+    return 0;
+  do {
+    if ((w = wcwidth (*pwcs)) < 0)
+      return -1;
+    len += w;
+  } while (*pwcs++ && --n > 0);
+  return len;
+}