int vprintf(const char *, va_list);
unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base);
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);
+char *env_get(const char *name);
+int env_set(const char *varname, const char *value);
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);