From cec10062d823eb05697eb956235d4ec66ee65e92 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Wed, 2 Sep 2015 20:00:18 +0200
Subject: add memcasecmp and wmemcasecmp
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 include/string.h    | 17 +++++++++++++++++
 include/wchar.h     | 17 +++++++++++++++++
 src/string/strcmp.c | 29 +++++++++++++++++++++++++++++
 src/wchar/wcscmp.c  | 24 ++++++++++++++++++++++++
 4 files changed, 87 insertions(+)

diff --git a/include/string.h b/include/string.h
index 53aaca6..d1eedd0 100644
--- a/include/string.h
+++ b/include/string.h
@@ -727,6 +727,23 @@ void* memdup(const void*, size_t)
 int memcmp(const void*, const void*, size_t)
   __GCC_ONLY(__attribute__((warn_unused_result, pure)));
 
+#if defined(_SLIBC_SOURCE) && !defined(__PORTABLE)
+/**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * This is a slibc extension added because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   a     A negative value is returned if this is the lesser.
+ * @param   b     A positive value is returned if this is the lesser.
+ * @param   size  The size of the segments.
+ * @return        Zero is returned if `a` and `b` are equal, otherwise,
+ *                see the specifications for `a` and `b`.
+ */
+int memcasecmp(const void*, const void*, size_t)
+  __GCC_ONLY(__attribute__((warn_unused_result, pure)));
+#endif
+
 /**
  * Compare two strings alphabetically in a case sensitive manner.
  * 
diff --git a/include/wchar.h b/include/wchar.h
index 755b583..2b757ca 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -658,6 +658,23 @@ wchar_t* wmemdup(const wchar_t*, size_t)
 int wmemcmp(const wchar_t*, const wchar_t*, size_t)
   __GCC_ONLY(__attribute__((warn_unused_result, pure)));
 
+#if defined(_SLIBC_SOURCE) && !defined(__PORTABLE)
+/**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * This is a slibc extension added because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   a     A negative value is returned if this is the lesser.
+ * @param   b     A positive value is returned if this is the lesser.
+ * @param   size  The size of the segments.
+ * @return        Zero is returned if `a` and `b` are equal, otherwise,
+ *                see the specifications for `a` and `b`.
+ */
+int wmemcasecmp(const wchar_t*, const wchar_t*, size_t)
+  __GCC_ONLY(__attribute__((warn_unused_result, pure)));
+#endif
+
 /**
  * Compare two strings alphabetically in a case sensitive manner.
  * 
diff --git a/src/string/strcmp.c b/src/string/strcmp.c
index 066b7c1..bffb2ad 100644
--- a/src/string/strcmp.c
+++ b/src/string/strcmp.c
@@ -44,6 +44,35 @@ int memcmp(const void* a, const void* b, size_t size)
 }
 
 
+/**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * This is a slibc extension added because it was useful
+ * in implementing slibc itself.
+ * 
+ * @param   a     A negative value is returned if this is the lesser.
+ * @param   b     A positive value is returned if this is the lesser.
+ * @param   size  The size of the segments.
+ * @return        Zero is returned if `a` and `b` are equal, otherwise,
+ *                see the specifications for `a` and `b`.
+ */
+int memcasecmp(const void* a, const void* b, size_t size)
+{
+  const signed char* s1 = a;
+  const signed char* s2 = b;
+  int c1, c2;
+  for (; size--; s1++, s2++)
+    if (*s1 != *s2)
+      {
+	c1 = isalpha(*s1) ? tolower(*s1) : (int)*s1;
+	c2 = isalpha(*s2) ? tolower(*s2) : (int)*s2;
+	if ((c1 -= c2))
+	  return c1;
+      }
+  return 0;
+}
+
+
 /**
  * Compare two strings alphabetically in a case sensitive manner.
  * 
diff --git a/src/wchar/wcscmp.c b/src/wchar/wcscmp.c
index aa3cdf3..ddbd228 100644
--- a/src/wchar/wcscmp.c
+++ b/src/wchar/wcscmp.c
@@ -41,6 +41,30 @@ int wmemcmp(const wchar_t* a, const wchar_t* b, size_t size)
 }
 
 
+/**
+ * Compare two memory segments alphabetically in a case insensitive manner.
+ * 
+ * @param   a     A negative value is returned if this is the lesser.
+ * @param   b     A positive value is returned if this is the lesser.
+ * @param   size  The size of the segments.
+ * @return        Zero is returned if `a` and `b` are equal, otherwise,
+ *                see the specifications for `a` and `b`.
+ */
+int wmemcasecmp(const wchar_t* a, const wchar_t* b, size_t size)
+{
+  wchar_t c1, c2;
+  for (; size--; a++, b++)
+    if (*a != *b);
+      {
+	c1 = iswalpha(*a) ? towlower(*a) : *a;
+	c2 = iswalpha(*b) ? towlower(*b) : *b;
+	if (c1 != c2)
+	  return c1 < c2 ? -1 : +1;
+      }
+  return 0;
+}
+
+
 /**
  * Compare two strings alphabetically in a case sensitive manner.
  * 
-- 
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