mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-30 23:50:04 +00:00
83 lines
3.5 KiB
Plaintext
83 lines
3.5 KiB
Plaintext
|
Array Manipulation Functions for C02
|
||
|
|
|
||
|
|
This library contains functions for handling non-string arrays. It is
|
||
|
|
maintained separately from string.h so that it can be included only
|
||
|
|
when needed, in order to reduce program size.
|
||
|
|
|
||
|
|
Arrays may be declared with up to 256 elements, but only lengths of up
|
||
|
|
to 255 characters may be passed to the array handling functions.
|
||
|
|
|
||
|
|
Usage: at the beginning of the program use the directives
|
||
|
|
|
||
|
|
#include <memory.h02>
|
||
|
|
|
||
|
|
The following functions are defined:
|
||
|
|
|
||
|
|
memdst(&d); Sets array d as the destination array for subsequent
|
||
|
|
memchr(). memcmp(), strcpy(), and memset() calls.
|
||
|
|
|
||
|
|
This function is not part of the standard C and
|
||
|
|
C++ string libraries. It is needed because of the
|
||
|
|
parameter passing limitations of C02.
|
||
|
|
|
||
|
|
Note: Aliased to the setdst() routine which sets
|
||
|
|
variables dstlo and dsthi as a pointer to the array.
|
||
|
|
|
||
|
|
memset(c, n); Fills first n bytes of the destination array set
|
||
|
|
by a a prior memdst() call with character c.
|
||
|
|
|
||
|
|
Note: dstlo and dsthi are left pointing to the
|
||
|
|
destination array.
|
||
|
|
|
||
|
|
p = memchr(c, n); Searches for character c in the first n bytes of the
|
||
|
|
destination array set by a a prior memdst() call.
|
||
|
|
|
||
|
|
Returns position of first occurance of character
|
||
|
|
in array, or 255 if character was not found or a
|
||
|
|
length of 0 was specified.
|
||
|
|
|
||
|
|
Note: dstlo and dsthi are left pointing to the
|
||
|
|
destination array.
|
||
|
|
|
||
|
|
c = memcmp(n, &s); Compares up to n bytes of source array s against the
|
||
|
|
destination array set by a prior memdst() call.
|
||
|
|
|
||
|
|
Returns 255 if destination < source, 0 if
|
||
|
|
destination = source, and 1 if destination > source.
|
||
|
|
|
||
|
|
These results can be evaluated using the C02
|
||
|
|
unary comparator ! or the test-operators :+ or :-.
|
||
|
|
|
||
|
|
Note: dstlo and dsthi are left pointing to the
|
||
|
|
destination array.
|
||
|
|
|
||
|
|
memcpy(n, &s); Copies n bytes of source array s into destination
|
||
|
|
array set by prior memdst() call. Data in the
|
||
|
|
destination array starting at position n is left
|
||
|
|
undisturbed.
|
||
|
|
|
||
|
|
Note: dstlo and dsthi are left pointing to the
|
||
|
|
destination array.
|
||
|
|
|
||
|
|
memswp(n, &s); Swaps n bytes of source array s with destination
|
||
|
|
array set by prior memdst() call. Data in both
|
||
|
|
arrays starting at position n is left undisturbed.
|
||
|
|
|
||
|
|
Note: dstlo and dsthi are left pointing to the
|
||
|
|
destination array.
|
||
|
|
|
||
|
|
Note: This library expects the following functions to be defined
|
||
|
|
|
||
|
|
setdst(&s); Set destination string pointer
|
||
|
|
setsrc(&s); Set source string pointer and initialize index
|
||
|
|
|
||
|
|
along with the zero page pairs
|
||
|
|
|
||
|
|
strlo, strhi Source String Pointer
|
||
|
|
dstlo, dsthi Destination String Pointer
|
||
|
|
|
||
|
|
and the memory locations
|
||
|
|
|
||
|
|
temp0, temp1 Temporary storage
|
||
|
|
|