mirror of https://github.com/RevCurtisP/C02.git
61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
/********************************************
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* stack - Software Stack Functions for C02 *
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********************************************/
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/* Drop Top Entry from Stack *
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* Returns: A=Number of bytes dropped *
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* 0 if none */
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char stkdrp();
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/* Duplicate Top Stack Entry *
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* Returns: A=Number of bytes retrieved *
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* 0 if none or overflow */
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char stkdup();
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/* Duplicate Entry Under Top of Stack *
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* Returns: A=Number of bytes retrieved *
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* 0 if none or overflow */
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char stkovr();
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/* Pop Top Stack Entry into Array *
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* Args: n - Number of bytes to write *
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* &m - Array to pop contents into *
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* Returns: A=Number of bytes retrieved *
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* 0 if none */
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char stkpop();
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/* Push Array Contents onto Stack *
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* Args: n - Number of bytes to write *
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* &m - Array containing bytes to push *
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* Returns: A=$FF if bytes were written *
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* $00 if block was overflowed */
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char stkpsh();
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/* Reset Stack Pointer to Stack Start *
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* Returns: Y,X=Pointer Address */
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void stkrst();
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/* Get Stack Size *
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* Returns: A=$FF if size greater than 0 *
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* $00 if stack is empty *
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* Y,X=Stack size in bytes */
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void stksiz();
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/* Push String onto Stack *
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* Args: &m - String to push *
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* Returns: A=$FF if bytes were written *
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* $00 if block was overflowed */
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char stkstr();
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/* Swap Top and Second Stack Entries *
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* Returns: A=Number of bytes in new top *
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* 0 if none or overflow */
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char stkswp();
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/* Copy Top Stack Entry into Array *
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* Args: n - Number of bytes to write *
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* &m - Array to pop contents into *
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* Returns: A=Number of bytes retrieved *
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* 0 if none */
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char stktop();
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