#define MAX_ENVVARS 256
void syserror(const char *m);
-void error(const char *m);
+void error(const char *m, int st);
void *xmalloc(size_t sz);
void xsetenv(const char *en, const char *ev, int overwrite);
void *xrealloc(void *ptr, size_t sz);
void filter_environment(unsigned flags, const char *prefix_in,
const char *const *patv,
+ const char *const *defaults,
void (*foundone)(const char *fulln, const char *en,
const char *ev, void *p),
void *p);