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75 lines
2.9 KiB
Plaintext
75 lines
2.9 KiB
Plaintext
Integer Functions for C02 Programs
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This module contains functions for manipulating and converting
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integer values.
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At the beginning of the program use the directives
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#include <stddef.h02>
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#include <intlib.h02>
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The following functions are defined:
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j = iabs(i); Returns the absolute value of the two's-complement
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integer i.
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In two's-complement arithmetic, the unsigned values
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0 - 32,767 are considered positive, while the unsigned
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values 32,768 - 65,535 are considered negative.
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j = atoi(s); Returns the integer numeric value of string s.
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Does not skip leading white-space characters and
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stops when first non-digit character is encountered.
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Overflows are ignored, so numbers greater than 65,535
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will be returned modulo 65,536.
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itoa(i); Stores the ASCII representation of unsigned integer
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i into the destination string.
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The destination string must be dimensioned at least
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six bytes in length, and is specified by calling
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setdst().
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Note: Calls cvibcd, then calls upbcdi for each digit
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to be printed.
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j = imax(i); Returns the greater of the unsigned integer b and
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the unsigned integer in the source pointer.
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Requires a prior call to setsrc() with the integer
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value to be compared against.
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j = imin(i); Returns the lesser of the unsigned integer b and
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the unsigned integer in the source pointer.
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Requires a prior call to setsrc() with the integer
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value to be compared against.
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j = ishftl(n,i) Shifts word b by n bits to the left and returns
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the result in j. If n is 0, the word is not
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shifted, and if n greater than 16, the returned
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value will be 0.
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j = ishftr(n,i) Shifts word b by n bits to the right and returns
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the result in j. If n is 0, the word is not
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shifted, and if n greater than 16, the returned
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value will be 0.
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Note: This library expects the following functions to be defined:
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along with the zero page variables
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zpage0,zpage1: Zero page variable pair
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the external variables
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exvar0,exvar1: External variable pair
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and the constants
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#CNSTNAME Constant description
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