timecounter: provide a helper function to shift the time.

[cascardo/linux.git] / lib / string.c

diff --git a/lib/string.c b/lib/string.c
index f3c6ff5..1006330 100644 (file)
--- a/lib/string.c
+++ b/lib/string.c
@@ -27,14 +27,14 @@
 #include <linux/bug.h>
 #include <linux/errno.h>
 
-#ifndef __HAVE_ARCH_STRNICMP
+#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;
@@ -56,6 +56,14 @@ int strnicmp(const char *s1, const char *s2, size_t len)
        } while (--len);
        return (int)c1 - (int)c2;
 }
+EXPORT_SYMBOL(strncasecmp);
+#endif
+#ifndef __HAVE_ARCH_STRNICMP
+#undef strnicmp
+int strnicmp(const char *s1, const char *s2, size_t len)
+{
+       return strncasecmp(s1, s2, len);
+}
 EXPORT_SYMBOL(strnicmp);
 #endif
 
@@ -73,20 +81,6 @@ int strcasecmp(const char *s1, const char *s2)
 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
-
 #ifndef __HAVE_ARCH_STRCPY
 /**
  * strcpy - Copy a %NUL terminated string
@@ -604,6 +598,22 @@ void *memset(void *s, int c, size_t count)
 EXPORT_SYMBOL(memset);
 #endif
 
+/**
+ * memzero_explicit - Fill a region of memory (e.g. sensitive
+ *                   keying data) with 0s.
+ * @s: Pointer to the start of the area.
+ * @count: The size of the area.
+ *
+ * memzero_explicit() doesn't need an arch-specific version as
+ * it just invokes the one of memset() implicitly.
+ */
+void memzero_explicit(void *s, size_t count)
+{
+       memset(s, 0, count);
+       OPTIMIZER_HIDE_VAR(s);
+}
+EXPORT_SYMBOL(memzero_explicit);
+
 #ifndef __HAVE_ARCH_MEMCPY
 /**
  * memcpy - Copy one area of memory to another