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[libc] Add strtok.c

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,7 @@

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

           strrchr.o strcat.o strncpy.o strncat.o strcoll.o \

-          strxfrm.o \

+          strxfrm.o strtok.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o \

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

           isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \

--- /dev/null

+++ b/libc/src/strtok.c

@@ -1,0 +1,26 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+char *

+strtok(const char *s, const char *delim)

+{

+	static char *line;

+

+	if (s) 

+		line = s;

+	if (!s && !line)

+		return NULL;

+

+	s = line + strspn(line, delim);

+	if (*s == '\0')

+		return line = NULL;

+

+	line = s + strcspn(s, delim);

+	if (*line != '\0')

+		*line++ = '\0';

+	else

+		line = NULL;

+

+	return s;

+}