1 files changed, 32 insertions, 0 deletions
diff --git a/lib/libc/strings/strncasecmp.c b/lib/libc/strings/strncasecmp.c
new file mode 100644
index 00000000..679cf245
--- /dev/null
+++ b/lib/libc/strings/strncasecmp.c
@@ -0,0 +1,32 @@
+#include <libc.h>
+#include <ctype.h>
+#include <stddef.h>
+
+int strncasecmp(const char *s1, const char *s2, size_t n)
+{
+	unsigned char c1, c2;
+
+	if (n == 0)
+		return 0;
+
+	while (n-- > 0 && *s1 && *s2) {
+		c1 = (unsigned char)tolower((unsigned char)*s1);
+		c2 = (unsigned char)tolower((unsigned char)*s2);
+		if (c1 != c2)
+			return c1 - c2;
+		s1++;
+		s2++;
+	}
+
+	if (n == (size_t)-1)
+		return 0;
+
+	return (unsigned char)tolower((unsigned char)*s1) -
+	       (unsigned char)tolower((unsigned char)*s2);
+}
+
+weak int strncasecmp_l(const char *s1, const char *s2, size_t n,
+		       locale_t unused locale)
+{
+	return strncasecmp(s1, s2, n);
+}