enum gf_en {GF_PRINT=0,GF_GPRINT,GF_COMMENT,GF_HRULE,GF_VRULE,GF_LINE1,
- GF_LINE2,GF_LINE3,GF_AREA,GF_STACK,GF_TICK,GF_DEF, GF_CDEF};
+ GF_LINE2,GF_LINE3,GF_AREA,GF_STACK,GF_TICK,
+ GF_DEF, GF_CDEF, GF_VDEF};
enum if_en {IF_GIF=0,IF_PNG=1};
+enum vdef_op_en {
+ VDEF_MAXIMUM /* like the MAX in (G)PRINT */
+ ,VDEF_MINIMUM /* like the MIN in (G)PRINT */
+ ,VDEF_AVERAGE /* like the AVERAGE in (G)PRINT */
+ ,VDEF_PERCENT /* Nth percentile */
+ ,VDEF_FIRST /* first non-unknown value and time */
+ ,VDEF_LAST /* last non-unknown value and time */
+ };
+typedef struct vdef_t {
+ enum vdef_op_en op;
+ double param; /* parameter for function, if applicable */
+ double val; /* resulting value */
+ time_t when; /* timestamp, if applicable */
+} vdef_t;
+
typedef struct col_trip_t {
int red; /* red = -1 is no color */
int green;
char format[FMT_LEG_LEN+5]; /* format for PRINT AND GPRINT */
char legend[FMT_LEG_LEN+5]; /* legend*/
gdPoint legloc; /* location of legend */
- double yrule; /* value for y rule line */
- time_t xrule; /* value for x rule line */
+ double yrule; /* value for y rule line and for VDEF */
+ time_t xrule; /* time for x rule line and for VDEF */
+ vdef_t vf; /* instruction for VDEF function */
rpnp_t *rpnp; /* instructions for CDEF function */
/* description of data fetched for the graph element */
int scan_for_col(char *, int, char *);
int rrd_graph(int, char **, char ***, int *, int *);
int bad_format(char *);
+int vdef_parse(struct graph_desc_t *,char *);
+int vdef_calc(image_desc_t *, int);
+int vdef_percent_compar(const void *,const void *);
/* translate time values into x coordinates */
/*#define xtr(x) (int)((double)im->xorigin \
conv_if(TICK,GF_TICK)
conv_if(DEF,GF_DEF)
conv_if(CDEF,GF_CDEF)
+ conv_if(VDEF,GF_VDEF)
return (-1);
}
long ii;
for(ii=0;ii<im->gdes_c-1;ii++){
if((im->gdes[ii].gf == GF_DEF
+ || im->gdes[ii].gf == GF_VDEF
|| im->gdes[ii].gf == GF_CDEF)
&& (strcmp(im->gdes[ii].vname,key) == 0)){
return ii;
return num[i];
}
-/* run the rpn calculator on all the CDEF arguments */
+/* run the rpn calculator on all the VDEF and CDEF arguments */
int
data_calc( image_desc_t *im){
long *steparray, rpi;
int stepcnt;
time_t now;
- rpnstack_t rpnstack;
+ rpnstack_t rpnstack;
- rpnstack_init(&rpnstack);
+ rpnstack_init(&rpnstack);
for (gdi=0;gdi<im->gdes_c;gdi++){
- /* only GF_CDEF elements are of interest */
- if (im->gdes[gdi].gf != GF_CDEF)
- continue;
- im->gdes[gdi].ds_cnt = 1;
- im->gdes[gdi].ds = 0;
- im->gdes[gdi].data_first = 1;
- im->gdes[gdi].start = 0;
- im->gdes[gdi].end = 0;
- steparray=NULL;
- stepcnt = 0;
- dataidx=-1;
-
- /* find the variables in the expression. And calc the lowest
- common denominator of all step sizes of the data sources involved.
- this will be the step size for the cdef created data source*/
-
- for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
- if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE){
- long ptr = im->gdes[gdi].rpnp[rpi].ptr;
- if ((steparray = rrd_realloc(steparray, (++stepcnt+1)*sizeof(*steparray)))==NULL){
- rrd_set_error("realloc steparray");
- rpnstack_free(&rpnstack);
- return -1;
- };
-
-
- steparray[stepcnt-1] = im->gdes[ptr].step;
-
- /* adjust start and end of cdef (gdi) so that it runs from
- the latest start point to the earliest endpoint of any of the
- rras involved (ptr) */
-
- if(im->gdes[gdi].start < im->gdes[ptr].start)
- im->gdes[gdi].start = im->gdes[ptr].start;
-
- if(im->gdes[gdi].end == 0
- || im->gdes[gdi].end > im->gdes[ptr].end)
- im->gdes[gdi].end = im->gdes[ptr].end;
+ /* Look for GF_VDEF and GF_CDEF in the same loop,
+ * so CDEFs can use VDEFs and vice versa
+ */
+ switch (im->gdes[gdi].gf) {
+ case GF_VDEF:
+ /* A VDEF has no DS. This also signals other parts
+ * of rrdtool that this is a VDEF value, not a CDEF.
+ */
+ im->gdes[gdi].ds_cnt = 0;
+ if (vdef_calc(im,gdi)) {
+ rrd_set_error("Error processing VDEF '%s'"
+ ,im->gdes[gdi].vname
+ );
+ rpnstack_free(&rpnstack);
+ return -1;
+ }
+ break;
+ case GF_CDEF:
+ im->gdes[gdi].ds_cnt = 1;
+ im->gdes[gdi].ds = 0;
+ im->gdes[gdi].data_first = 1;
+ im->gdes[gdi].start = 0;
+ im->gdes[gdi].end = 0;
+ steparray=NULL;
+ stepcnt = 0;
+ dataidx=-1;
+
+ /* Find the variables in the expression.
+ * - VDEF variables are substituted by their values
+ * and the opcode is changed into OP_NUMBER.
+******************
+* Note to Jake: I cannot oversee the implications for your
+* COMPUTE DS stuff. Please check if VDEF and COMPUTE are
+* compatible (or can be made so).
+******************
+ * - CDEF variables are analized for their step size,
+ * the lowest common denominator of all the step
+ * sizes of the data sources involved is calculated
+ * and the resulting number is the step size for the
+ * resulting data source.
+ */
+ for(rpi=0;im->gdes[gdi].rpnp[rpi].op != OP_END;rpi++){
+ if(im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE){
+ long ptr = im->gdes[gdi].rpnp[rpi].ptr;
+ if (im->gdes[ptr].ds_cnt == 0) {
+#if 0
+printf("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
+ im->gdes[gdi].vname,
+ im->gdes[ptr].vname);
+printf("DEBUG: value from vdef is %f\n",im->gdes[ptr].vf.val);
+#endif
+ im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
+ im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
+ } else {
+ if ((steparray = rrd_realloc(steparray, (++stepcnt+1)*sizeof(*steparray)))==NULL){
+ rrd_set_error("realloc steparray");
+ rpnstack_free(&rpnstack);
+ return -1;
+ };
+
+ steparray[stepcnt-1] = im->gdes[ptr].step;
+
+ /* adjust start and end of cdef (gdi) so
+ * that it runs from the latest start point
+ * to the earliest endpoint of any of the
+ * rras involved (ptr)
+ */
+ if(im->gdes[gdi].start < im->gdes[ptr].start)
+ im->gdes[gdi].start = im->gdes[ptr].start;
+
+ if(im->gdes[gdi].end == 0 ||
+ im->gdes[gdi].end > im->gdes[ptr].end)
+ im->gdes[gdi].end = im->gdes[ptr].end;
- /* store pointer to the first element of the rra providing
- data for variable, further save step size and data source count
- of this rra*/
- im->gdes[gdi].rpnp[rpi].data =
- im->gdes[ptr].data + im->gdes[ptr].ds;
- im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
- im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
- /* backoff the *.data ptr; this is done so rpncalc() function
- * doesn't have to treat the first case differently */
- im->gdes[gdi].rpnp[rpi].data -= im->gdes[ptr].ds_cnt;
- }
-
- }
- if(steparray == NULL){
- rrd_set_error("rpn expressions without variables are not supported");
- rpnstack_free(&rpnstack);
- return -1;
- }
- steparray[stepcnt]=0;
- /* now find the step for the result of the cdef. so that we land on
- each step in all of the variables rras */
-
- im->gdes[gdi].step = lcd(steparray);
-
-
- free(steparray);
-
- if((im->gdes[gdi].data = malloc(((im->gdes[gdi].end
- -im->gdes[gdi].start)
+ /* store pointer to the first element of
+ * the rra providing data for variable,
+ * further save step size and data source
+ * count of this rra
+ */
+ im->gdes[gdi].rpnp[rpi].data =
+ im->gdes[ptr].data + im->gdes[ptr].ds;
+ im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
+ im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
+
+ /* backoff the *.data ptr; this is done so
+ * rpncalc() function doesn't have to treat
+ * the first case differently
+ */
+ im->gdes[gdi].rpnp[rpi].data-=im->gdes[ptr].ds_cnt;
+ } /* if ds_cnt != 0 */
+ } /* if OP_VARIABLE */
+ } /* loop through all rpi */
+
+ if(steparray == NULL){
+ rrd_set_error("rpn expressions without DEF"
+ " or CDEF variables are not supported");
+ rpnstack_free(&rpnstack);
+ return -1;
+ }
+ steparray[stepcnt]=0;
+ /* Now find the resulting step. All steps in all
+ * used RRAs have to be visited
+ */
+ im->gdes[gdi].step = lcd(steparray);
+ free(steparray);
+ if((im->gdes[gdi].data = malloc((
+ (im->gdes[gdi].end-im->gdes[gdi].start)
/ im->gdes[gdi].step +1)
* sizeof(double)))==NULL){
- rrd_set_error("malloc im->gdes[gdi].data");
- rpnstack_free(&rpnstack);
- return -1;
- }
+ rrd_set_error("malloc im->gdes[gdi].data");
+ rpnstack_free(&rpnstack);
+ return -1;
+ }
- /* step through the new cdef results array and calculate the values */
- for (now = im->gdes[gdi].start;
- now<=im->gdes[gdi].end;
- now += im->gdes[gdi].step){
- rpnp_t *rpnp = im -> gdes[gdi].rpnp;
-
- /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
- * in this case we are advancing by timesteps;
- * we use the fact that time_t is a synonym for long
+ /* Step through the new cdef results array and
+ * calculate the values
*/
- if (rpn_calc(rpnp,&rpnstack,(long) now,
- im->gdes[gdi].data,++dataidx) == -1)
+ for (now = im->gdes[gdi].start;
+ now<=im->gdes[gdi].end;
+ now += im->gdes[gdi].step)
{
- /* rpn_calc sets the error string */
- rpnstack_free(&rpnstack);
- return -1;
- }
-
- } /* enumerate over time steps within a CDEF */
- } /* enumerate over CDEFs */
+ rpnp_t *rpnp = im -> gdes[gdi].rpnp;
+
+ /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
+ * in this case we are advancing by timesteps;
+ * we use the fact that time_t is a synonym for long
+ */
+ if (rpn_calc(rpnp,&rpnstack,(long) now,
+ im->gdes[gdi].data,++dataidx) == -1) {
+ /* rpn_calc sets the error string */
+ rpnstack_free(&rpnstack);
+ return -1;
+ }
+ } /* enumerate over time steps within a CDEF */
+ break;
+ default:
+ continue;
+ }
+ } /* enumerate over CDEFs */
rpnstack_free(&rpnstack);
return 0;
}
case GF_VRULE:
case GF_DEF:
case GF_CDEF:
+ case GF_VDEF:
break;
}
}
break;
case GF_DEF:
case GF_CDEF:
+ case GF_VDEF:
break;
}
}
if(data_fetch(im)==-1)
return -1;
- /* evaluate CDEF operations ... */
+ /* evaluate VDEF and CDEF operations ... */
if(data_calc(im)==-1)
return -1;
switch(im->gdes[i].gf){
case GF_CDEF:
+ case GF_VDEF:
case GF_DEF:
case GF_PRINT:
case GF_GPRINT:
switch(im->gdes[i].gf){
case GF_HRULE:
+ if(isnan(im->gdes[i].yrule)) { /* fetch variable */
+ im->gdes[i].yrule = im->gdes[im->gdes[i].vidx].vf.val;
+ };
if(im->gdes[i].yrule >= im->minval
&& im->gdes[i].yrule <= im->maxval)
gdImageLine(gif,
im->gdes[i].col.i);
break;
case GF_VRULE:
- if(im->gdes[i].xrule >= im->start
- && im->gdes[i].xrule <= im->end)
- gdImageLine(gif,
+ if(im->gdes[i].xrule == 0) { /* fetch variable */
+ im->gdes[i].xrule = im->gdes[im->gdes[i].vidx].vf.when;
+ };
+ if(im->gdes[i].xrule >= im->start
+ && im->gdes[i].xrule <= im->end)
+ gdImageLine(gif,
xtr(im,im->gdes[i].xrule),im->yorigin,
xtr(im,im->gdes[i].xrule),im->yorigin-im->ysize,
im->gdes[i].col.i);
- break;
+ break;
default:
break;
}
}
break;
case GF_VRULE:
- if(sscanf(
- &argv[i][argstart],
- "%lu#%2x%2x%2x:%n",
- &im.gdes[im.gdes_c-1].xrule,
- &col_red,
- &col_green,
- &col_blue,
- &strstart) >= 4){
- im.gdes[im.gdes_c-1].col.red = col_red;
- im.gdes[im.gdes_c-1].col.green = col_green;
- im.gdes[im.gdes_c-1].col.blue = col_blue;
- if(strstart <= 0){
- im.gdes[im.gdes_c-1].legend[0] = '\0';
- } else {
- scan_for_col(&argv[i][argstart+strstart],FMT_LEG_LEN,im.gdes[im.gdes_c-1].legend);
- }
+ /* scan for either "VRULE:vname#..." or "VRULE:num#..."
+ *
+ * If a vname is used, the value 0 is set; this is catched
+ * when graphing. Setting value 0 from the script is not
+ * permitted
+ */
+ strstart=0;
+ sscanf(&argv[i][argstart], DEF_NAM_FMT "#%n"
+ ,varname
+ ,&strstart
+ );
+ if (strstart==0) {
+ sscanf(&argv[i][argstart], "%lu#%n"
+ ,(long unsigned int *)&im.gdes[im.gdes_c-1].xrule
+ ,&strstart
+ );
+ if (im.gdes[im.gdes_c-1].xrule==0)
+ strstart=0;
} else {
+ im.gdes[im.gdes_c-1].xrule = 0; /* signal use of vname */
+ if((im.gdes[im.gdes_c-1].vidx=find_var(&im,varname))==-1){
+ im_free(&im);
+ rrd_set_error("unknown variable '%s' in VRULE",varname);
+ return -1;
+ }
+ if(im.gdes[im.gdes[im.gdes_c-1].vidx].gf != GF_VDEF) {
+ im_free(&im);
+ rrd_set_error("Only VDEF is allowed in VRULE",varname);
+ return -1;
+ }
+ };
+ if (strstart==0) {
im_free(&im);
rrd_set_error("can't parse '%s'",&argv[i][argstart]);
return -1;
+ } else {
+ int n=0;
+ if(sscanf(
+ &argv[i][argstart+strstart],
+ "%2x%2x%2x:%n",
+ &col_red,
+ &col_green,
+ &col_blue,
+ &n)>=3) {
+ im.gdes[im.gdes_c-1].col.red = col_red;
+ im.gdes[im.gdes_c-1].col.green = col_green;
+ im.gdes[im.gdes_c-1].col.blue = col_blue;
+ if (n==0) {
+ im.gdes[im.gdes_c-1].legend[0] = '\0';
+ } else {
+ scan_for_col(&argv[i][argstart+strstart+n],FMT_LEG_LEN,im.gdes[im.gdes_c-1].legend);
+ }
+ } else {
+ im_free(&im);
+ rrd_set_error("can't parse '%s'",&argv[i][argstart]);
+ return -1;
+ }
}
break;
case GF_TICK:
rrd_set_error("can't parse CDEF '%s'",&argv[i][argstart]);
return -1;
}
- /* checking for duplicate DEF CDEFS */
+ /* checking for duplicate variable names */
if(find_var(&im,im.gdes[im.gdes_c-1].vname) != -1){
im_free(&im);
rrd_set_error("duplicate variable '%s'",
}
free(rpnex);
break;
+ case GF_VDEF:
+ /*
+ * strstart is set to zero and will NOT be changed
+ * if the comma is not matched. This means that it
+ * remains zero. Although strstart is initialized to
+ * zero at the beginning of this loop, we do it again
+ * here just in case someone changes the code...
+ *
+ * According to the docs we cannot rely on the
+ * returned value from sscanf; it can be 2 or 3,
+ * depending on %n incrementing it or not.
+ */
+ strstart=0;
+ sscanf(
+ &argv[i][argstart],
+ DEF_NAM_FMT "=" DEF_NAM_FMT ",%n",
+ im.gdes[im.gdes_c-1].vname,
+ varname,
+ &strstart);
+ if (strstart){
+ /* checking both variable names */
+ if (find_var(&im,im.gdes[im.gdes_c-1].vname) != -1){
+ im_free(&im);
+ rrd_set_error("duplicate variable '%s'",
+ im.gdes[im.gdes_c-1].vname);
+ return -1;
+ } else {
+ if ((im.gdes[im.gdes_c-1].vidx=find_var(&im,varname)) == -1){
+ im_free(&im);
+ rrd_set_error("variable '%s' not known in VDEF '%s'",
+ varname,
+ im.gdes[im.gdes_c-1].vname);
+ return -1;
+ } else {
+ if(im.gdes[im.gdes[im.gdes_c-1].vidx].gf != GF_DEF
+ && im.gdes[im.gdes[im.gdes_c-1].vidx].gf != GF_CDEF){
+ rrd_set_error("variable '%s' not DEF nor CDEF in VDEF '%s'",
+ varname,
+ im.gdes[im.gdes_c-1].vname);
+ im_free(&im);
+ return -1;
+ }
+ }
+ /* parsed upto and including the first comma. Now
+ * see what function is requested. This function
+ * sets the error string.
+ */
+ if (vdef_parse(&im.gdes[im.gdes_c-1],&argv[i][argstart+strstart])<0) {
+ im_free(&im);
+ return -1;
+ };
+ }
+ } else {
+ im_free(&im);
+ rrd_set_error("can't parse VDEF '%s'",&argv[i][argstart]);
+ return -1;
+ }
+ break;
case GF_DEF:
if (sscanf(
&argv[i][argstart],
}
return 0;
}
+int
+vdef_parse(gdes,str)
+struct graph_desc_t *gdes;
+char *str;
+{
+ /* A VDEF currently is either "func" or "param,func"
+ * so the parsing is rather simple. Change if needed.
+ */
+ double param;
+ char func[30];
+ int n;
+
+ n=0;
+ sscanf(str,"%le,%29[A-Z]%n",¶m,func,&n);
+ if (n==strlen(str)) { /* matched */
+ ;
+ } else {
+ n=0;
+ sscanf(str,"%29[A-Z]%n",func,&n);
+ if (n==strlen(str)) { /* matched */
+ param=DNAN;
+ } else {
+ rrd_set_error("Unknown function string '%s' in VDEF '%s'"
+ ,str
+ ,gdes->vname
+ );
+ return -1;
+ }
+ }
+ if (!strcmp("PERCENT",func)) gdes->vf.op = VDEF_PERCENT;
+ else if (!strcmp("MAXIMUM",func)) gdes->vf.op = VDEF_MAXIMUM;
+ else if (!strcmp("AVERAGE",func)) gdes->vf.op = VDEF_AVERAGE;
+ else if (!strcmp("MINIMUM",func)) gdes->vf.op = VDEF_MINIMUM;
+ else if (!strcmp("FIRST", func)) gdes->vf.op = VDEF_FIRST;
+ else if (!strcmp("LAST", func)) gdes->vf.op = VDEF_LAST;
+ else {
+ rrd_set_error("Unknown function '%s' in VDEF '%s'\n"
+ ,func
+ ,gdes->vname
+ );
+ return -1;
+ };
+
+ switch (gdes->vf.op) {
+ case VDEF_PERCENT:
+ if (isnan(param)) { /* no parameter given */
+ rrd_set_error("Function '%s' needs parameter in VDEF '%s'\n"
+ ,func
+ ,gdes->vname
+ );
+ return -1;
+ };
+ if (param>=0.0 && param<=100.0) {
+ gdes->vf.param = param;
+ gdes->vf.val = DNAN; /* undefined */
+ gdes->vf.when = 0; /* undefined */
+ } else {
+ rrd_set_error("Parameter '%f' out of range in VDEF '%s'\n"
+ ,param
+ ,gdes->vname
+ );
+ return -1;
+ };
+ break;
+ case VDEF_MAXIMUM:
+ case VDEF_AVERAGE:
+ case VDEF_MINIMUM:
+ case VDEF_FIRST:
+ case VDEF_LAST:
+ if (isnan(param)) {
+ gdes->vf.param = DNAN;
+ gdes->vf.val = DNAN;
+ gdes->vf.when = 0;
+ } else {
+ rrd_set_error("Function '%s' needs no parameter in VDEF '%s'\n"
+ ,func
+ ,gdes->vname
+ );
+ return -1;
+ };
+ break;
+ };
+ return 0;
+}
+int
+vdef_calc(im,gdi)
+image_desc_t *im;
+int gdi;
+{
+ graph_desc_t *src,*dst;
+ rrd_value_t *data;
+ long step,steps;
+
+ dst = &im->gdes[gdi];
+ src = &im->gdes[dst->vidx];
+ data = src->data + src->ds + src->ds_cnt; /* skip first value! */
+ steps = (src->end - src->start) / src->step;
+
+#if 0
+printf("DEBUG: start == %lu, end == %lu, %lu steps\n"
+ ,src->start
+ ,src->end
+ ,steps
+ );
+#endif
+
+ switch (im->gdes[gdi].vf.op) {
+ case VDEF_PERCENT: {
+ rrd_value_t * array;
+ int field;
+
+
+ if ((array = malloc(steps*sizeof(double)))==NULL) {
+ rrd_set_error("malloc VDEV_PERCENT");
+ return -1;
+ }
+ for (step=0;step < steps; step++) {
+ array[step]=data[step*src->ds_cnt];
+ }
+ qsort(array,step,sizeof(double),vdef_percent_compar);
+
+ field = (steps-1)*dst->vf.param/100;
+ dst->vf.val = array[field];
+ dst->vf.when = 0; /* no time component */
+#if 0
+for(step=0;step<steps;step++)
+printf("DEBUG: %3i:%10.2f %c\n",step,array[step],step==field?'*':' ');
+#endif
+ }
+ break;
+ case VDEF_MAXIMUM:
+ step=0;
+ while (step != steps && isnan(data[step*src->ds_cnt])) step++;
+ if (step == steps) {
+ dst->vf.val = DNAN;
+ dst->vf.when = 0;
+ } else {
+ dst->vf.val = data[steps*src->ds_cnt];
+ dst->vf.when = src->start + (step+1)*src->step;
+ }
+ while (step != steps) {
+ if (finite(data[step*src->ds_cnt])) {
+ if (data[step*src->ds_cnt] > dst->vf.val) {
+ dst->vf.val = data[steps*src->ds_cnt];
+ dst->vf.when = src->start + (step+1)*src->step;
+ }
+ }
+ step++;
+ }
+ break;
+ case VDEF_AVERAGE: {
+ int cnt=0;
+ double sum=0.0;
+ for (step=0;step<steps;step++) {
+ if (finite(data[step*src->ds_cnt])) {
+ sum += data[step*src->ds_cnt];
+ cnt ++;
+ }
+ step++;
+ }
+ if (cnt) {
+ dst->vf.val = sum/cnt;
+ dst->vf.when = 0; /* no time component */
+ } else {
+ dst->vf.val = DNAN;
+ dst->vf.when = 0;
+ }
+ }
+ break;
+ case VDEF_MINIMUM:
+ step=0;
+ while (step != steps && isnan(data[step*src->ds_cnt])) step++;
+ if (step == steps) {
+ dst->vf.val = DNAN;
+ dst->vf.when = 0;
+ } else {
+ dst->vf.val = data[steps*src->ds_cnt];
+ dst->vf.when = src->start + (step+1)*src->step;
+ }
+ while (step != steps) {
+ if (finite(data[step*src->ds_cnt])) {
+ if (data[step*src->ds_cnt] < dst->vf.val) {
+ dst->vf.val = data[steps*src->ds_cnt];
+ dst->vf.when = src->start + (step+1)*src->step;
+ }
+ }
+ step++;
+ }
+ break;
+ case VDEF_FIRST:
+ /* The time value returned here is one step before the
+ * actual time value. This is the start of the first
+ * non-NaN interval.
+ */
+ step=0;
+ while (step != steps && isnan(data[step*src->ds_cnt])) step++;
+ if (step == steps) { /* all entries were NaN */
+ dst->vf.val = DNAN;
+ dst->vf.when = 0;
+ } else {
+ dst->vf.val = data[step*src->ds_cnt];
+ dst->vf.when = src->start + step*src->step;
+ }
+ break;
+ case VDEF_LAST:
+ /* The time value returned here is the
+ * actual time value. This is the end of the last
+ * non-NaN interval.
+ */
+ step=steps-1;
+ while (step >= 0 && isnan(data[step*src->ds_cnt])) step--;
+ if (step < 0) { /* all entries were NaN */
+ dst->vf.val = DNAN;
+ dst->vf.when = 0;
+ } else {
+ dst->vf.val = data[step*src->ds_cnt];
+ dst->vf.when = src->start + (step+1)*src->step;
+ }
+ break;
+ }
+ return 0;
+}
+
+/* NaN <= -INF <= finite_values <= INF */
+int
+vdef_percent_compar(a,b)
+const void *a,*b;
+{
+ /* Equality is not returned; this doesn't hurt except
+ * (maybe) for a little performance.
+ */
+ /* First catch NaN values. They are smallest */
+ if (isnan( *(double *)a )) return -1;
+ if (isnan( *(double *)b )) return 1;
+
+ /* NaN doestn't reach this part so INF and -INF are extremes.
+ * The sign from isinf() is compatible with the sign we return
+ */
+ if (isinf( *(double *)a )) return isinf( *(double *)a );
+ if (isinf( *(double *)b )) return isinf( *(double *)b );
+
+ /* If we reach this, both values must be finite */
+ if ( *(double *)a < *(double *)b ) return -1; else return 1;
+}
projects / rrdtool.git / blobdiff