89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
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/****************************************************************************
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* RRDtool 1.4.9 Copyright by Tobi Oetiker, 1997-2014
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****************************************************************************
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* rrd_rpncalc.h RPN calculator functions
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****************************************************************************/
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#ifndef _RRD_RPNCALC_H
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#define _RRD_RPNCALC_H
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/* WARNING: if new operators are added, they MUST be added at the very end of the list.
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* This is because COMPUTE (CDEF) DS store OP nodes by number (name is not
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* an option due to limited par array size). OP nodes must have the same
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* numeric values, otherwise the stored numbers will mean something different. */
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enum op_en { OP_NUMBER = 0, OP_VARIABLE, OP_INF, OP_PREV, OP_NEGINF,
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OP_UNKN, OP_NOW, OP_TIME, OP_ADD, OP_MOD, OP_SUB, OP_MUL,
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OP_DIV, OP_SIN, OP_DUP, OP_EXC, OP_POP,
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OP_COS, OP_LOG, OP_EXP, OP_LT, OP_LE, OP_GT, OP_GE, OP_EQ, OP_IF,
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OP_MIN, OP_MAX, OP_LIMIT, OP_FLOOR, OP_CEIL,
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OP_UN, OP_END, OP_LTIME, OP_NE, OP_ISINF, OP_PREV_OTHER, OP_COUNT,
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OP_ATAN, OP_SQRT, OP_SORT, OP_REV, OP_TREND, OP_TRENDNAN,
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OP_ATAN2, OP_RAD2DEG, OP_DEG2RAD,
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OP_PREDICT,OP_PREDICTSIGMA,
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OP_AVG, OP_ABS, OP_ADDNAN,
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OP_MINNAN, OP_MAXNAN
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};
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typedef struct rpnp_t {
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enum op_en op;
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double val; /* value for a OP_NUMBER */
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long ptr; /* pointer into the gdes array for OP_VAR */
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double *data; /* pointer to the current value from OP_VAR DAS */
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long ds_cnt; /* data source count for data pointer */
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long step; /* time step for OP_VAR das */
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} rpnp_t;
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/* a compact representation of rpnp_t for computed data sources */
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typedef struct rpn_cdefds_t {
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char op; /* rpn operator type */
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short val; /* used by OP_NUMBER and OP_VARIABLE */
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} rpn_cdefds_t;
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#define MAX_VNAME_LEN 255
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#define DEF_NAM_FMT "%255[-_A-Za-z0-9]"
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/* limit imposed by sizeof(rpn_cdefs_t) and rrd.ds_def.par */
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#define DS_CDEF_MAX_RPN_NODES (int)(sizeof(unival)*10 / sizeof(rpn_cdefds_t))
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typedef struct rpnstack_t {
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double *s;
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long dc_stacksize;
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long dc_stackblock;
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} rpnstack_t;
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void rpnstack_init(
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rpnstack_t *rpnstack);
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void rpnstack_free(
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rpnstack_t *rpnstack);
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int parseCDEF_DS(
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const char *def,
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rrd_t *rrd,
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int ds_idx);
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long lookup_DS(
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void *rrd_vptr,
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char *ds_name);
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short rpn_compact(
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rpnp_t *rpnp,
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rpn_cdefds_t **rpnc,
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short *count);
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rpnp_t *rpn_expand(
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rpn_cdefds_t *rpnc);
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void rpn_compact2str(
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rpn_cdefds_t *rpnc,
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ds_def_t *ds_def,
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char **str);
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rpnp_t *rpn_parse(
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void *key_hash,
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const char *const expr,
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long (*lookup) (void *,
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char *));
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short rpn_calc(
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rpnp_t *rpnp,
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rpnstack_t *rpnstack,
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long data_idx,
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rrd_value_t *output,
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int output_idx);
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#endif
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