From 77ec902ca70b4da4556ececcf7ef2024955b0e63 Mon Sep 17 00:00:00 2001
From: ridiculousfish <corydoras@ridiculousfish.com>
Date: Thu, 16 May 2013 19:44:21 -0700
Subject: [PATCH] Fix for failing to weak link wcsncasecmp - binary dies on
 SnowLeopard

---
 fallback.cpp | 48 ++++++++++++++++++++++++++++++------------------
 fallback.h   |  4 +++-
 2 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/fallback.cpp b/fallback.cpp
index a88f00f73..7e215bbe7 100644
--- a/fallback.cpp
+++ b/fallback.cpp
@@ -817,7 +817,7 @@ static wchar_t *wcsdup_fallback(const wchar_t *in)
     return out;
 }
 
-int wcscasecmp_fallback(const wchar_t *a, const wchar_t *b)
+static int wcscasecmp_fallback(const wchar_t *a, const wchar_t *b)
 {
     if (*a == 0)
     {
@@ -834,6 +834,26 @@ int wcscasecmp_fallback(const wchar_t *a, const wchar_t *b)
         return wcscasecmp_fallback(a+1,b+1);
 }
 
+static int wcsncasecmp_fallback(const wchar_t *a, const wchar_t *b, size_t count)
+{
+    if (count == 0)
+        return 0;
+
+    if (*a == 0)
+    {
+        return (*b==0)?0:-1;
+    }
+    else if (*b == 0)
+    {
+        return 1;
+    }
+    int diff = towlower(*a)-towlower(*b);
+    if (diff != 0)
+        return diff;
+    else
+        return wcsncasecmp_fallback(a+1,b+1, count-1);
+}
+
 
 #if __APPLE__ && __DARWIN_C_LEVEL >= 200809L
 /* Note parens avoid the macro expansion */
@@ -851,6 +871,13 @@ int wcscasecmp_use_weak(const wchar_t *a, const wchar_t *b)
     return wcscasecmp_fallback(a, b);
 }
 
+int wcsncasecmp_use_weak(const wchar_t *s1, const wchar_t *s2, size_t n)
+{
+    if (wcsncasecmp != NULL)
+        return (wcsncasecmp)(s1, s2, n);
+    return wcsncasecmp_fallback(s1, s2, n);
+}
+
 #else //__APPLE__
 
 #ifndef HAVE_WCSDUP
@@ -881,24 +908,9 @@ size_t wcslen(const wchar_t *in)
 #endif
 
 #ifndef HAVE_WCSNCASECMP
-int wcsncasecmp(const wchar_t *a, const wchar_t *b, int count)
+int wcsncasecmp(const wchar_t *a, const wchar_t *b, size_t count)
 {
-    if (count == 0)
-        return 0;
-
-    if (*a == 0)
-    {
-        return (*b==0)?0:-1;
-    }
-    else if (*b == 0)
-    {
-        return 1;
-    }
-    int diff = towlower(*a)-towlower(*b);
-    if (diff != 0)
-        return diff;
-    else
-        return wcsncasecmp(a+1,b+1, count-1);
+    return wcsncasecmp_fallback(a, b, count);
 }
 #endif
 
diff --git a/fallback.h b/fallback.h
index 433f48d58..eba91be6c 100644
--- a/fallback.h
+++ b/fallback.h
@@ -217,8 +217,10 @@ int wcwidth(wchar_t c);
 #if __APPLE__ && __DARWIN_C_LEVEL >= 200809L
 wchar_t *wcsdup_use_weak(const wchar_t *);
 int wcscasecmp_use_weak(const wchar_t *, const wchar_t *);
+int wcsncasecmp_use_weak(const wchar_t *s1, const wchar_t *s2, size_t n);
 #define wcsdup(a) wcsdup_use_weak((a))
 #define wcscasecmp(a, b) wcscasecmp_use_weak((a), (b))
+#define wcsncasecmp(a, b, c) wcsncasecmp_use_weak((a), (b), (c))
 
 #else
 
@@ -273,7 +275,7 @@ size_t wcslen(const wchar_t *in);
    fish and guaranteed to be a sane, english word. Using wcsncasecmp on
    a user-supplied string should be considered a bug.
 */
-int wcsncasecmp(const wchar_t *a, const wchar_t *b, int count);
+int wcsncasecmp(const wchar_t *a, const wchar_t *b, size_t count);
 
 /**
    Returns a newly allocated wide character string wich is a copy of