Add build system scaffolding and libc headers

1 files changed, 37 insertions, 0 deletions

diff --git a/lib/libc/string/strtok_r.c b/lib/libc/string/strtok_r.c
new file mode 100644
index 00000000..57555b14
--- /dev/null
+++ b/lib/libc/string/strtok_r.c
@@ -0,0 +1,37 @@
+#include <string.h>
+
+char *strtok_r(char *restrict s, const char *restrict sep,
+	       char **restrict state)
+{
+	if (s == NULL) {
+		s = *state;
+	}
+
+	if (s == NULL) {
+		return NULL;
+	}
+
+	while (*s && strchr(sep, *s)) {
+		s++;
+	}
+
+	if (*s == '\0') {
+		*state = NULL;
+		return NULL;
+	}
+
+	char *start = s;
+
+	while (*s && strchr(sep, *s) == NULL) {
+		s++;
+	}
+
+	if (*s) {
+		*s = '\0';
+		*state = s + 1;
+	} else {
+		*state = NULL;
+	}
+
+	return start;
+}