1 /****************************************************************************
2 * RRDtool 1.2.3 Copyright by Tobi Oetiker, 1997-2005
3 ****************************************************************************
4 * rrd_rpncalc.h RPN calculator functions
5 ****************************************************************************/
9 /* WARNING: if new operators are added, they MUST be added at the very end of the list.
10 * This is because COMPUTE (CDEF) DS store OP nodes by number (name is not
11 * an option due to limited par array size). OP nodes must have the same
12 * numeric values, otherwise the stored numbers will mean something different. */
13 enum op_en {OP_NUMBER=0,OP_VARIABLE,OP_INF,OP_PREV,OP_NEGINF,
14 OP_UNKN,OP_NOW,OP_TIME,OP_ADD,OP_MOD,OP_SUB,OP_MUL,
15 OP_DIV,OP_SIN, OP_DUP, OP_EXC, OP_POP,
16 OP_COS,OP_LOG,OP_EXP,OP_LT,OP_LE,OP_GT,OP_GE,OP_EQ,OP_IF,
17 OP_MIN,OP_MAX,OP_LIMIT, OP_FLOOR, OP_CEIL,
18 OP_UN,OP_END,OP_LTIME,OP_NE,OP_ISINF,OP_PREV_OTHER,OP_COUNT,
19 OP_ATAN,OP_SQRT,OP_SORT,OP_REV,OP_TREND};
21 typedef struct rpnp_t {
23 double val; /* value for a OP_NUMBER */
24 long ptr; /* pointer into the gdes array for OP_VAR */
25 double *data; /* pointer to the current value from OP_VAR DAS*/
26 long ds_cnt; /* data source count for data pointer */
27 long step; /* time step for OP_VAR das */
30 /* a compact representation of rpnp_t for computed data sources */
31 typedef struct rpn_cdefds_t {
32 char op; /* rpn operator type */
33 short val; /* used by OP_NUMBER and OP_VARIABLE */
36 /* limit imposed by sizeof(rpn_cdefs_t) and rrd.ds_def.par */
37 #define DS_CDEF_MAX_RPN_NODES 26
39 typedef struct rpnstack_t {
45 void rpnstack_init(rpnstack_t *rpnstack);
46 void rpnstack_free(rpnstack_t *rpnstack);
48 void parseCDEF_DS(char *def, rrd_t *rrd, int ds_idx);
49 long lookup_DS(void *rrd_vptr, char *ds_name);
51 short rpn_compact(rpnp_t *rpnp,rpn_cdefds_t **rpnc,short *count);
52 rpnp_t * rpn_expand(rpn_cdefds_t *rpnc);
53 void rpn_compact2str(rpn_cdefds_t *rpnc,ds_def_t *ds_def,char **str);
54 rpnp_t * rpn_parse(void *key_hash,char *expr, long (*lookup)(void *,char *));
55 short rpn_calc(rpnp_t *rpnp, rpnstack_t *rpnstack, long data_idx, rrd_value_t *output, int output_idx);