lib: Add sbi_strncmp implementation

This commit add an implementation of sbi_strncmp.

Signed-off-by: Abner Chang <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Reviewed-by: Anup Patel <[email protected]>

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/sbi/sbi_string.c b/lib/sbi/sbi_string.c
index 38b700bb..7805ba4a 100644
--- a/lib/sbi/sbi_string.c
+++ b/lib/sbi/sbi_string.c
@@ -14,6 +14,10 @@
 
 #include <sbi/sbi_string.h>
 
+/*
+  Provides sbi_strcmp for the completeness of supporting string functions.
+  it is not recommended to use sbi_strcmp() but use sbi_strncmp instead.
+*/
 int sbi_strcmp(const char *a, const char *b)
 {
 	/* search first diff or end of string */
@@ -23,6 +27,15 @@ int sbi_strcmp(const char *a, const char *b)
 	return *a - *b;
 }
 
+int sbi_strncmp(const char *a, const char *b, size_t count)
+{
+	/* search first diff or end of string */
+	for (; count > 0 && *a == *b && *a != '\0'; a++, b++, count--)
+		;
+
+	return *a - *b;
+}
+
 size_t sbi_strlen(const char *str)
 {
 	unsigned long ret = 0;