newlib-2.4.0: wide character strings

git-svn-id: svn://kolibrios.org@6557 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/string/wcsnlen.c

@@ -0,0 +1,75 @@
+/* 
+FUNCTION
+        <<wcsnlen>>---get fixed-size wide-character string length
+    
+INDEX
+        wcsnlen
+
+ANSI_SYNOPSIS
+        #include <wchar.h>
+        size_t wcsnlen(const wchar_t *<[s]>, size_t <[maxlen]>);
+
+TRAD_SYNOPSIS
+        #include <wchar.h>
+        size_t wcsnlen(<[s]>, <[maxlen]>)
+        wchar_t *<[s]>;
+        size_t <[maxlen]>;
+
+DESCRIPTION
+        The <<wcsnlen>> function computes the number of wide-character codes
+        in the wide-character string pointed to by <[s]> not including the
+        terminating L'\0' wide character but at most <[maxlen]> wide
+        characters.
+
+RETURNS
+        <<wcsnlen>> returns the length of <[s]> if it is less then <[maxlen]>,
+        or <[maxlen]> if there is no L'\0' wide character in first <[maxlen]>
+        characters.
+
+PORTABILITY
+<<wcsnlen>> is a GNU extension.
+
+<<wcsnlen>> requires no supporting OS subroutines.
+*/
+
+/*
+ * Copyright (c) 2003, Artem B. Bityuckiy (dedekind@mail.ru).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the above copyright notice,
+ * this condition statement, and the following disclaimer are retained
+ * in any redistributions of the source code.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <_ansi.h>
+#include <sys/types.h>
+#include <wchar.h>
+
+size_t
+_DEFUN(wcsnlen, (s, maxlen), 
+                 _CONST wchar_t *s _AND 
+                 size_t maxlen)
+{
+  _CONST wchar_t *p;
+
+  p = s;
+  while (*p && maxlen-- > 0)
+    p++;
+
+  return (size_t)(p - s);
+}
+
+
+