From b4945e88b206a174c7187d22b70163b75d9cb54a Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Sun, 24 Mar 2013 00:54:34 +0100
Subject: [PATCH] Add wcscspn(3).

---
 libc/Makefile        |  1 +
 libc/include/wchar.h |  2 +-
 libc/wcscspn.cpp     | 44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 libc/wcscspn.cpp

diff --git a/libc/Makefile b/libc/Makefile
index 1f60bcaf..d8adb659 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -135,6 +135,7 @@ wcschrnul.o \
 wcschr.o \
 wcscmp.o \
 wcscpy.o \
+wcscspn.o \
 wcslen.o \
 wcsncat.o \
 wcsncpy.o \
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index bdb3f617..5c8e206c 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -68,6 +68,7 @@ wchar_t* wcschr(const wchar_t*, wchar_t);
 wchar_t* wcschrnul(const wchar_t*, wchar_t);
 int wcscmp(const wchar_t*, const wchar_t*);
 wchar_t* wcscpy(wchar_t* restrict, const wchar_t* restrict);
+size_t wcscspn(const wchar_t*, const wchar_t*);
 size_t wcslen(const wchar_t*);
 wchar_t* wcsncat(wchar_t* restrict, const wchar_t* restrict, size_t);
 wchar_t* wcsncpy(wchar_t* restrict, const wchar_t* restrict, size_t);
@@ -105,7 +106,6 @@ long long wcstoll(const wchar_t* restrict, wchar_t** restrict, int);
 long wcstol(const wchar_t* restrict, wchar_t** restrict, int);
 size_t mbrlen(const char* restrict, size_t, mbstate_t* restrict);
 size_t mbsrtowcs(wchar_t* restrict, const char** restrict, size_t, mbstate_t* restrict);
-size_t wcscspn(const wchar_t*, const wchar_t*);
 size_t wcsftime(wchar_t* restrict, size_t, const wchar_t* restrict, const struct tm* restrict);
 size_t wcsrtombs(char* restrict, const wchar_t** restrict, size_t, mbstate_t* restrict);
 size_t wcsxfrm(wchar_t* restrict, const wchar_t* restrict, size_t);
diff --git a/libc/wcscspn.cpp b/libc/wcscspn.cpp
new file mode 100644
index 00000000..86df14b8
--- /dev/null
+++ b/libc/wcscspn.cpp
@@ -0,0 +1,44 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    wcscspn.cpp
+    Search a string for a set of characters.
+
+*******************************************************************************/
+
+#include <wchar.h>
+
+extern "C" size_t wcscspn(const wchar_t* str, const wchar_t* reject)
+{
+	size_t rejectlen = 0;
+	while ( reject[rejectlen] ) { rejectlen++; }
+	for ( size_t result = 0; true; result++ )
+	{
+		wchar_t c = str[result];
+		if ( !c ) { return result; }
+		bool matches = false;
+		for ( size_t i = 0; i < rejectlen; i++ )
+		{
+			if ( str[result] != reject[i] ) { continue; }
+			matches = true;
+			break;
+		}
+		if ( matches ) { return result; }
+	}
+}