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143 lines
6.6 KiB
Plaintext
143 lines
6.6 KiB
Plaintext
Extended Input/Output Functions for C02 Programs
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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 <stdlib.h02>
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#include <stdiox.h02>
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The following functions are defined:
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c = getprc(&s); Writes the string s, waits for a key to be pressed.
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then writes blank line
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Returns the ASCII value of the key that was
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pressed.
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Note: Calls the puts function, the newlin
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function twice, then the getc function.
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c = anykey(); Writes the string "Press any key to continue...",
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followed by a blank line, to the screen, then waits
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for a key to be pressed.
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Returns the ASCII value of the key that was
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pressed.
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Note: Calls the getprc function, with a hard
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coded string.
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putspc(b); Writes a space character to the screen.
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Note: Used by the putdel and putder functions.
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putdec(b); Writes the decimal representation of byte b to the
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screen. The output will be between one and three
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digits with no leading spaces.
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Note: Calls part of the ctoa routine from stdlib
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which leaves the binary values of the ones, tens,
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and hundreds digits in variables temp0, temp1, and
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temp2, respectively.
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putdel(b); Writes the decimal representation of byte b to the
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screen. The output is left justified by appending it
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with 1 space if b is between 10 and 99, or two spaces
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if b is less than 10.
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Note: Calls putdec and putspc. Leaves the value
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of b in varible temp3.
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putder(b); Writes the decimal representation of byte b to the
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screen. The output is right justified by prepending it
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with 1 space if b is between 10 and 99, or two spaces
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if b is less than 10.
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Note: Calls putdec and putspc. Leaves the value
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of b in varible temp3.
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puthex(b); Writes the hexadecimal representation of byte b to the
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screen. The output is always two hex digits, the first
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being a leading 0 if b is less than 16.
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Note: Aliased to the prbyte routine.
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putwrd(&d); Writes the hexadecimal representation of address &d to
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the screen. The output is always four hex digits, with
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leading zeros if b is less than $1000.
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Note: Calls savrxy, saving the X and Y registers to
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temp1 and temp2, respectively, then calls puthex, once
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for the most significant byte and again for the least
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significant byte.
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putdst(); Prints the destination string set by the setdst or
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setstr functions.
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This can be used to print the results of any function
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call that stores it's result in the destination string,
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such as strcat, strcpy, and strcut in string,
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Note: calls putc and is called by printf when
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processing a %S formatting tag.
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r = printf(b, &s): Writes the value of byte b to screen, formatting
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the output according the contents of string s.
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The output consists of the characters in s, but with
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any formatting tags replaced with an ASCII
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representation of the value of b.
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The recognized formatting tags are:
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%C - output the ASCII character represented by b
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%D - output b as a an unjustified decimal number
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%H - output b as a two-digit hexadecimal number
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%L - output b as a left justified decimal number
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%R - output b as a right justified decimal number
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%% - output a single % character
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Unlike the printf function in standard C, only
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one value argument may be passed and that value is
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used for each formatting tag in the format string.
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Two additional formatting tag are supported:
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%S - output the destination string
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%W - output the destination address as a
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as a four-digit hexadecimal number
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The destination string and/or address is set using
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the setdst or strdst function (from the "string"
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library) before calling printf. Multiple occurances
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of the %S or %w tag will cause the destination string
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and/or address to be repeated.
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When tag types are mixed, the %S and/or %W tags will
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output the destination string and/or address, while
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the other tags will output the formatted byte. If
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only the %S and/or %W tags are used, then the byte
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argument may be excluded from the call.
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The letter in the formatting tag may be upper or
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lower case with either a 0 or 1 in the high bit.
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Unrecognized formatting tags are interpreted as %C.
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Note: Calls putdec, putdel, putder, puthex, putwrd,
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or putdst depending on which formatting tags are
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used. The value of b is left in variable temp3.
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Note: This library expects the following functions to be defined:
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cubcd(); Convert byte to BCD and unpack into three bytes
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prbyte(); Print byte to screen as hexadecimal number
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prchr(c); Print ASCII character to screen
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savrxy(); Save X and Y registers.
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setsrc(&s); Set source string pointer and initialize index
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along with the zero page variable pairs:
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srclo,srchi: Source string pointer
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and the temporary variables
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temp0,temp1,temp2,temp3
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