1 files changed, 12 insertions, 0 deletions
diff --git a/lib/libc/string/strspn.c b/lib/libc/string/strspn.c
new file mode 100644
index 00000000..78277ae7
--- /dev/null
+++ b/lib/libc/string/strspn.c
@@ -0,0 +1,12 @@
+#include <stddef.h>
+#include <string.h>
+
+size_t strspn(const char *s1, const char *s2)
+{
+	size_t count = 0;
+	while (*s1 != '\0' && strchr(s2, *s1) != NULL) {
+		count++;
+		s1++;
+	}
+	return count;
+}