const char *get_vardir(void);
#define FMT(f,a) __attribute__((format(printf,f,a)))
+#define SCANFMT(f,a) __attribute__((format(scanf,f,a)))
#define NORET __attribute__((noreturn))
#define DEFINE_VWRAPPERF(decls, funcf, otherattribs) \
void *mmalloc(size_t sz);
void *mrealloc(void *p, size_t sz);
-void fgetsline(FILE *f, char *lbuf, size_t lbufsz);
+
+#define dbassert(x) ((x) ? (void)0 : dbfile_assertfail(__FILE__,__LINE__,#x))
+void dbfile_assertfail(const char *file, int line, const char *m) NORET;
+
+FILE *dbfile;
+void dbfile_getsline(char *lbuf, size_t lbufsz, const char *file, int line);
+int dbfile_open(const char *tpath); /* 0: ENOENT; 1: worked */
+void dbfile_close(void); /* idempotent */
+
+int dbfile_scanf(const char *fmt, ...) SCANFMT(1,2);
+int dbfile_vscanf(const char *fmt, va_list al) SCANFMT(1,0);
#endif /*COMMON_H*/