mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-06-08 06:29:32 +00:00
126 lines
5.4 KiB
Plaintext
126 lines
5.4 KiB
Plaintext
Sta Functions
|
|
|
|
This module contains extended stack manipulation functions.
|
|
|
|
Usage: at the beginning of the program use the directives
|
|
|
|
#include <stddef.h02>
|
|
#include <memory.h02>
|
|
#include <string.h02>
|
|
#include <stack.h02>
|
|
#include <stackx.h02>
|
|
|
|
The following application functions are defined:
|
|
|
|
r = stkstr(&s); Stack String: Creates a new entry at the end of
|
|
the stack consisting the characters in string
|
|
s, including the terminating ASCII null. This
|
|
ensures that when the entry is popped off the
|
|
stack, the destination string will be properly
|
|
terminated.
|
|
|
|
If the string is empty or the bew entry would
|
|
overflow the end of the stack space, no entry is
|
|
created and a value of 0 is returned. Otherwise,
|
|
the number of bytes in the new entry is returned.
|
|
|
|
Note: Calls the strlen function, then calls the
|
|
stkpsh function.
|
|
|
|
r = stktop(&m); Stack Top: Copies the bytes from the last entry of
|
|
the stack into array m and leaves the entry on the
|
|
stack.
|
|
|
|
If the stack is empty, the value 0 is returned.
|
|
Otherwise, the number of bytes in the entry is
|
|
returned.
|
|
|
|
Note: Calls stkpop, then restores stklo and stkhi
|
|
to their prior values.
|
|
|
|
r = stkdup(); Stack Duplicate: Creates a new entry at the end of
|
|
the stack consisting of the bytes in the last entry
|
|
of the stack.
|
|
|
|
If the stack is empty or the new entry would
|
|
overflow the end of the stack space, no entry is
|
|
created and a value of 0 is returned. Otherwise,
|
|
the number of bytes in the new entry is returned.
|
|
|
|
Note: Sets dstlo and dsthi to the stklo and stkhi,
|
|
sets srclo and srchi to point to the beginning
|
|
of the last entry, updates stklo and stkhi, then
|
|
calls the memcpy function.
|
|
|
|
r = stkovr(); Stack Over: Creates a new entry at the end of
|
|
the stack consisting of the bytes in the second
|
|
to last entry of the stack.
|
|
|
|
If there are less than two entries in the stack
|
|
or the new entry would overflow the end of the
|
|
stack space, no entry is created and a value of
|
|
0 is returned. Otherwise, the number of bytes in
|
|
the new entry is returned.
|
|
|
|
Note: Sets dstlo and dsthi to the stklo and stkhi,
|
|
sets srclo and srchi to point to the beginning
|
|
of the second to last entry, updates stklo and
|
|
stkhi, then calls the memcpy function.
|
|
|
|
r = stkswp(); Stack Swap: Moves the last entry in the stack to
|
|
the second to last position and the second to
|
|
last entry to the last position.
|
|
|
|
If there are less than two entries in the stack
|
|
or there is not enough room in the stack space
|
|
to make a copy of the second to last entry, the
|
|
entries are not swapped and a value of 0 is
|
|
returned. Otherwise, the number of bytes in the
|
|
new last entry is returned.
|
|
|
|
Note: Calls stkovr, creating a copy of the second
|
|
to last stack entry, restores stklo and stkhi to
|
|
their original values, then calls the memcpy twice.
|
|
|
|
*,m,l = stkptr(); Stack Pointer: Returns the address contained in
|
|
the stack pointer as the most significant byte
|
|
and the least significant byte.
|
|
|
|
This is a utility function not normally used in
|
|
application code.
|
|
|
|
Note: Gets variables stkslo and stkshi.
|
|
|
|
stkset(&d); Stack Set: Sets stack pointer to address d.
|
|
|
|
This is a utility function not normally used in
|
|
application code.
|
|
|
|
Note: Sets variables stkslo and stkshi.
|
|
|
|
Note: This library expects the following functions to be defined
|
|
|
|
memcpl Copy memory (alternate entry point)
|
|
stkadd Add to stack pointer
|
|
stkdrn Stack drop (alternate entry point)
|
|
stkpsa Push entry onto stack (alternate entry point)
|
|
stkrsp Restore Stack Pointer
|
|
stkssp Save Stack Pointer
|
|
strlen Get string length
|
|
|
|
along with the zero page variable pairs
|
|
|
|
srclo, srchi Source String Pointer
|
|
dstlo, dsthi Destination String Pointer
|
|
stklo, stkhi stack Pointer
|
|
|
|
the static variables
|
|
|
|
stkslo, stkshi Stack Start Address
|
|
stkelo, stkehi Stack End Address
|
|
|
|
and the transient variables
|
|
|
|
temp0, temp1 Temporary storage
|
|
temp2, temp3
|