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