From 8f8d09c041ffce812946f8bd6b4b388676e4e56e Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Wed, 9 Apr 2003 10:42:12 +0000
Subject: 	* libc/include/wchar.h: Add definitions for wcswidth and
 wcwidth. 	* libc/string/Makefile.am: Add wcswidth.c and wcwidth.c 
 * libc/string/Makefile.in: Regenerated. 	* libc/string/wcswidth.c: New
 file. 	* libc/string/wcwidth.c: New file. 	* libc/string/wcstrings.tex:
 Add wcswidth and wcwidth.

---
 newlib/libc/string/wcswidth.c | 56 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 newlib/libc/string/wcswidth.c

(limited to 'newlib/libc/string/wcswidth.c')

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;
+}
-- 
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