-char *getenv (char *name);
-void setenv (char *varname, char *varvalue);
+int strict_strtoul(const char *cp, unsigned int base, unsigned long *res);
+char *getenv (const char *name);
+int setenv (const char *varname, const char *varvalue);
+long simple_strtol(const char *cp,char **endp,unsigned int base);
+int strcmp(const char * cs,const char * ct);
+unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
+unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base);