1 /****************************************************************************
2 * RRDtool 1.2.23 Copyright by Tobi Oetiker, 1997-2007
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, OP_TRENDNAN,
20 OP_ATAN2, OP_RAD2DEG, OP_DEG2RAD,
24 typedef struct rpnp_t {
26 double val; /* value for a OP_NUMBER */
27 long ptr; /* pointer into the gdes array for OP_VAR */
28 double *data; /* pointer to the current value from OP_VAR DAS */
29 long ds_cnt; /* data source count for data pointer */
30 long step; /* time step for OP_VAR das */
33 /* a compact representation of rpnp_t for computed data sources */
34 typedef struct rpn_cdefds_t {
35 char op; /* rpn operator type */
36 short val; /* used by OP_NUMBER and OP_VARIABLE */
39 /* limit imposed by sizeof(rpn_cdefs_t) and rrd.ds_def.par */
40 #define DS_CDEF_MAX_RPN_NODES 26
42 typedef struct rpnstack_t {
49 rpnstack_t *rpnstack);
51 rpnstack_t *rpnstack);
73 const char *const expr,
74 long (*lookup) (void *,