[PATCH] StdLib/LibC: add strnlen function wrapper

[mateusz.mowka@intel.com]

From: mateusz-mowka <mateusz.mowka@intel.com>

This patch adds strnlen function wrapper that internally calls
AsciiStrnLenS, which is defined in BaseLib.

Cc: Caleb Reister <caleb.reister@intel.com>
Cc: Rebecca Cran <rebecca@nuviainc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>

Signed-off-by: Mateusz Mówka <mateusz.mowka@intel.com>
---
 StdLib/Include/string.h   | 11 +++++++++++
 StdLib/LibC/String/Misc.c | 12 ++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/StdLib/Include/string.h b/StdLib/Include/string.h
index 0c80944..07652ca 100644
--- a/StdLib/Include/string.h
+++ b/StdLib/Include/string.h
@@ -62,6 +62,7 @@
       void     *memset      (void *s, int c, size_t n);
       char     *strerror    (int num);
       size_t    strlen      (const char *);
+      size_t    strnlen     (const char, size_t n)
 
       ################ BSD Compatibility Functions
       char     *strdup      (const char *);
@@ -454,6 +455,16 @@ char     *strerror(int Num);
 **/
 size_t    strlen(const char *S);
 
+/** The strnlen function computes the length of a fixed-size string.
+
+    @param[in]  S   Pointer to the string to determine the length of.
+    @param[in]  N   Length of a string including the terminating character.
+
+    @return   The strnlen function returns the number of characters that
+              precede the terminating null character but not exceeding N.
+**/
+size_t    strnlen(const char *S, size_t N);
+
 
 /* ################   BSD Compatibility Functions   ####################### */
 
diff --git a/StdLib/LibC/String/Misc.c b/StdLib/LibC/String/Misc.c
index f024136..cf680e3 100644
--- a/StdLib/LibC/String/Misc.c
+++ b/StdLib/LibC/String/Misc.c
@@ -99,3 +99,15 @@ strlen(const char *s)
 {
   return (size_t)AsciiStrLen( s);
 }
+
+/** The strnlen function computes the length of the string pointed to by s
+    but at most n
+
+    @return   The strnlen function returns the number of characters that
+              precede the terminating null character but at most n.
+**/
+size_t
+strnlen(const char *s, size_t n)
+{
+  return (size_t)AsciiStrnLenS( s, n);
+}
-- 
2.28.0.windows.1

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