Texas Instruments TI89 Developer Guide - Page 638
funcNum, funcTag, BYTE pointer.
UPC - 033317198566
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596 Appendix A: System Routines - Graphing FindGrFunc Declaration: SYM_ENTRY * FindGrFunc (BYTE funcNum, HSYM * hsym, EStackIndex * funcTag, BYTE funcName[ ], UCHAR xory) Category(ies): Graphing Description: Create a function name in funcName for function number funcNum in the current graph mode (gr_active) and return a pointer to the symbol table entry for that function, its HSYM, and a pointer to its function tag. Inputs: funcNum - Function number (i.e. 1 for y1(x) in function mode). hsym - Address of an HSYM. funcTag - BYTE pointer. funcName - Address of BYTE array of at least 9 bytes to use for function name. xory - 'x' or 'y' for parametric function name. Outputs: SYM_ENTRY of symbol if found, NULL otherwise. hsym - Returned HSYM of symbol if found, NULL otherwise. funcTag - Returned pointer to function tag of symbol if found. funcName - Name of function found stored here (in tokenized form - so the first byte will be zero). Assumptions: None Side Effects: None Availability: All versions of the TI-89 / TI-92 Plus. TI-89 / TI-92 Plus Differences: None See Also: FindFunc Example: This example pushes a list of the names of all of the graph functions with defined functions for the current graph mode on the estack. short fNum; HSYM hsym; SYM_ENTRY *symPtr; BYTE fName[9]; EStackIndex funcTag; push_quantum( END_TAG ); for (fNum = 99; fNum >= 1; fNum--) { if (symPtr = FindGrFunc( fNum, &hsym, &funcTag, fName, 'x' )) push_zstr( (char *) fName+1 ); /* 1st byte is zero */ } push_quantum( LIST_TAG ); TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001