[PATCH] lib: string: remove duplicated function

[Denis Orlov <denorl2009@xxxxxxxxx>]

We have two functions that are doing the same thing: 'strncasecmp' and
'strnicmp'. The only difference between them is that the latter is
correctly handling the len argument of 0. So rename it into the former
one ('strncasecmp', as it is the POSIX name for this function), deleting
the other implementation. As no one is actually using 'strnicmp', no
other code requires any fixes.

This change is effectively forwarded from the Linux commits
'lib/string.c: remove duplicated function'
(hash cd514e727b18ff4d189b8e268db13729a4175091) and
'lib/string.c: remove strnicmp()'
(hash af3cd13501eb04ca61d017ff4406f1cbffafdc04).

Signed-off-by: Denis Orlov <denorl2009@xxxxxxxxx>
---
 include/linux/string.h |  3 ---
 lib/string.c           | 48 +++++++++++++++---------------------------
 2 files changed, 17 insertions(+), 34 deletions(-)

diff --git a/include/linux/string.h b/include/linux/string.h
index 0c79d3e5cf..cd81ab1396 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -58,9 +58,6 @@ extern int strcmp(const char *,const char *);
 #ifndef __HAVE_ARCH_STRNCMP
 extern int strncmp(const char *,const char *,__kernel_size_t);
 #endif
-#ifndef __HAVE_ARCH_STRNICMP
-extern int strnicmp(const char *, const char *, __kernel_size_t);
-#endif
 #ifndef __HAVE_ARCH_STRCASECMP
 extern int strcasecmp(const char *s1, const char *s2);
 #endif
diff --git a/lib/string.c b/lib/string.c
index 005f4532bb..8ea68044cc 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -24,14 +24,28 @@
 #include <linux/ctype.h>
 #include <malloc.h>
 
-#ifndef __HAVE_ARCH_STRNICMP
+#ifndef __HAVE_ARCH_STRCASECMP
+int strcasecmp(const char *s1, const char *s2)
+{
+	int c1, c2;
+
+	do {
+		c1 = tolower(*s1++);
+		c2 = tolower(*s2++);
+	} while (c1 == c2 && c1 != 0);
+	return c1 - c2;
+}
+EXPORT_SYMBOL(strcasecmp);
+#endif
+
+#ifndef __HAVE_ARCH_STRNCASECMP
 /**
- * strnicmp - Case insensitive, length-limited string comparison
+ * strncasecmp - Case insensitive, length-limited string comparison
  * @s1: One string
  * @s2: The other string
  * @len: the maximum number of characters to compare
  */
-int strnicmp(const char *s1, const char *s2, size_t len)
+int strncasecmp(const char *s1, const char *s2, size_t len)
 {
 	/* Yes, Virginia, it had better be unsigned */
 	unsigned char c1, c2;
@@ -53,34 +67,6 @@ int strnicmp(const char *s1, const char *s2, size_t len)
 	} while (--len);
 	return (int)c1 - (int)c2;
 }
-EXPORT_SYMBOL(strnicmp);
-#endif
-
-#ifndef __HAVE_ARCH_STRCASECMP
-int strcasecmp(const char *s1, const char *s2)
-{
-	int c1, c2;
-
-	do {
-		c1 = tolower(*s1++);
-		c2 = tolower(*s2++);
-	} while (c1 == c2 && c1 != 0);
-	return c1 - c2;
-}
-EXPORT_SYMBOL(strcasecmp);
-#endif
-
-#ifndef __HAVE_ARCH_STRNCASECMP
-int strncasecmp(const char *s1, const char *s2, size_t n)
-{
-	int c1, c2;
-
-	do {
-		c1 = tolower(*s1++);
-		c2 = tolower(*s2++);
-	} while ((--n > 0) && c1 == c2 && c1 != 0);
-	return c1 - c2;
-}
 EXPORT_SYMBOL(strncasecmp);
 #endif
 
-- 
2.30.2