-int PngSize(FILE *, long *, long *);
-
-int rrd_create_fn(char *file_name, rrd_t *rrd);
-int rrd_fetch_fn(char *filename, enum cf_en cf_idx,
- time_t *start,time_t *end,
- unsigned long *step,
- unsigned long *ds_cnt,
- char ***ds_namv,
- rrd_value_t **data);
-
-void rrd_free(rrd_t *rrd);
-void rrd_freemem(void *mem);
-void rrd_init(rrd_t *rrd);
-
-int rrd_open(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr);
-int rrd_open_r(char *file_name, FILE **in_file, rrd_t *rrd, int rdwr);
-int readfile(char *file, char **buffer, int skipfirst);
-int readfile_r(char *file, char **buffer, int skipfirst);
-
-#define RRD_READONLY 0
-#define RRD_READWRITE 1
-
-enum cf_en cf_conv(char *string);
-enum dst_en dst_conv(char *string);
-long ds_match(rrd_t *rrd,char *ds_nam);
-double rrd_diff(char *a, char *b);
-
- /* rrd_strerror is thread safe, but still it uses a global buffer
- (but one per thread), thus subsequent calls within a single
- thread overwrite the same buffer */
-const char *rrd_strerror(int err);
-
-/* just a defensive work-around... */
-#define strerror(x) rrd_strerror(x)