+ break;
+ case OP_PREV:
+ if ((output_idx-1) <= 0) {
+ rpnstack -> s[++stptr] = DNAN;
+ } else {
+ rpnstack -> s[++stptr] = output[output_idx-1];
+ }
+ break;
+ case OP_UNKN:
+ rpnstack -> s[++stptr] = DNAN;
+ break;
+ case OP_INF:
+ rpnstack -> s[++stptr] = DINF;
+ break;
+ case OP_NEGINF:
+ rpnstack -> s[++stptr] = -DINF;
+ break;
+ case OP_NOW:
+ rpnstack -> s[++stptr] = (double)time(NULL);
+ break;
+ case OP_TIME:
+ /* HACK: this relies on the data_idx being the time,
+ * which the within-function scope is unaware of */
+ rpnstack -> s[++stptr] = (double) data_idx;
+ break;
+ case OP_LTIME:
+ rpnstack -> s[++stptr] = (double) tzoffset(data_idx) + (double)data_idx;
+ break;
+ case OP_ADD:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1]
+ + rpnstack -> s[stptr];
+ stptr--;
+ break;
+ case OP_SUB:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] - rpnstack -> s[stptr];
+ stptr--;
+ break;
+ case OP_MUL:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr-1] = (rpnstack -> s[stptr-1]) * (rpnstack -> s[stptr]);
+ stptr--;
+ break;
+ case OP_DIV:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] / rpnstack -> s[stptr];
+ stptr--;
+ break;
+ case OP_MOD:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr-1] = fmod(rpnstack -> s[stptr-1],rpnstack -> s[stptr]);
+ stptr--;
+ break;
+ case OP_SIN:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = sin(rpnstack -> s[stptr]);
+ break;
+ case OP_COS:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = cos(rpnstack -> s[stptr]);
+ break;
+ case OP_CEIL:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = ceil(rpnstack -> s[stptr]);
+ break;
+ case OP_FLOOR:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = floor(rpnstack -> s[stptr]);
+ break;
+ case OP_LOG:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = log(rpnstack -> s[stptr]);
+ break;
+ case OP_DUP:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr+1] = rpnstack -> s[stptr];
+ stptr++;
+ break;
+ case OP_POP:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ stptr--;
+ break;
+ case OP_EXC:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ } else {
+ double dummy;
+ dummy = rpnstack -> s[stptr] ;
+ rpnstack -> s[stptr] = rpnstack -> s[stptr-1];
+ rpnstack -> s[stptr-1] = dummy;
+ }
+ break;
+ case OP_EXP:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack -> s[stptr] = exp(rpnstack -> s[stptr]);
+ break;
+ case OP_LT:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack -> s[stptr-1]))
+ ;
+ else if (isnan(rpnstack -> s[stptr]))
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr];
+ else
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] < rpnstack -> s[stptr] ? 1.0 : 0.0;
+ stptr--;
+ break;
+ case OP_LE:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack -> s[stptr-1]))
+ ;
+ else if (isnan(rpnstack -> s[stptr]))
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr];
+ else
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] <= rpnstack -> s[stptr] ? 1.0 : 0.0;
+ stptr--;
+ break;
+ case OP_GT:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack -> s[stptr-1]))
+ ;
+ else if (isnan(rpnstack -> s[stptr]))
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr];
+ else
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] > rpnstack -> s[stptr] ? 1.0 : 0.0;
+ stptr--;
+ break;
+ case OP_GE:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack -> s[stptr-1]))
+ ;
+ else if (isnan(rpnstack -> s[stptr]))
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr];
+ else
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] >= rpnstack -> s[stptr] ? 1.0 : 0.0;
+ stptr--;
+ break;
+ case OP_EQ:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack -> s[stptr-1]))
+ ;
+ else if (isnan(rpnstack -> s[stptr]))
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr];
+ else
+ rpnstack -> s[stptr-1] = rpnstack -> s[stptr-1] == rpnstack -> s[stptr] ? 1.0 : 0.0;
+ stptr--;
+ break;
+ case OP_IF:
+ if(stptr<2){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack->s[stptr-2] = rpnstack->s[stptr-2] != 0.0 ? rpnstack->s[stptr-1] : rpnstack->s[stptr];
+ stptr--;
+ stptr--;
+ break;
+ case OP_MIN:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack->s[stptr-1]))
+ ;
+ else if (isnan(rpnstack->s[stptr]))
+ rpnstack->s[stptr-1] = rpnstack->s[stptr];
+ else if (rpnstack->s[stptr-1] > rpnstack->s[stptr])
+ rpnstack->s[stptr-1] = rpnstack->s[stptr];
+ stptr--;
+ break;
+ case OP_MAX:
+ if(stptr<1){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ if (isnan(rpnstack->s[stptr-1]))
+ ;
+ else if (isnan(rpnstack->s[stptr]))
+ rpnstack->s[stptr-1] = rpnstack->s[stptr];
+ else if (rpnstack->s[stptr-1] < rpnstack->s[stptr])
+ rpnstack->s[stptr-1] = rpnstack->s[stptr];
+ stptr--;
+ break;
+ case OP_LIMIT:
+ if(stptr<2){
+ rrd_set_error("RPN stack underflow");
+ free(rpnstack->s);
+ return -1;
+ }
+ if (isnan(rpnstack->s[stptr-2]))
+ ;
+ else if (isnan(rpnstack->s[stptr-1]))
+ rpnstack->s[stptr-2] = rpnstack->s[stptr-1];
+ else if (isnan(rpnstack->s[stptr]))
+ rpnstack->s[stptr-2] = rpnstack->s[stptr];
+ else if (rpnstack->s[stptr-2] < rpnstack->s[stptr-1])
+ rpnstack->s[stptr-2] = DNAN;
+ else if (rpnstack->s[stptr-2] > rpnstack->s[stptr])
+ rpnstack->s[stptr-2] = DNAN;
+ stptr-=2;
+ break;
+ case OP_UN:
+ if(stptr<0){
+ rrd_set_error("RPN stack underflow");
+ return -1;
+ }
+ rpnstack->s[stptr] = isnan(rpnstack->s[stptr]) ? 1.0 : 0.0;
+ break;
+ case OP_END:
+ break;
+ }
+ }
+ if(stptr!=0){
+ rrd_set_error("RPN final stack size != 1");
+ return -1;
+ }
+
+ output[output_idx] = rpnstack->s[0];
+ return 0;