[PATCH] StdLib/LibC: add strnlen function wrapper


mateusz-mowka
 

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

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

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

Signed-off-by: Mateusz Mówka <mateusz.mowka@...>
---
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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