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73 lines
2.9 KiB
Plaintext
73 lines
2.9 KiB
Plaintext
Standard Input/Output Functions for Apple 1
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At the beginning of the program use the directives
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#include <stdioh02>
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The following functions are defined:
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c = getchr(); Waits for a keypress and returns the cleaned
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ASCII value corresponding to the pressed key.
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Note: Calls getkey() from system library.
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putchr(c); Writes character c to the screen.
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Note: Calls prchr() from system library.
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r = getstr(&s); Reads a maximum of 128 characters from keyboard
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until the Return/Enter key is pressed, storing the
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entered characters as null-terminated string s.
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Allows corrections using Backspace/Delete.
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Pressing the Escape/Abort key terminates entry,
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leaving the string in an undefined state.
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Returns number of characters entered, or 255
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if entry was aborted.
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Note: Calls getchr() in a loop and uses constants
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DELKEY, RTNKEY, and ESCKEY from the system library.
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r = outstr(&s): Writes up to 128 characters of null-terminated
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string s to the screen.
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Returns position of null terminator in string.
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Note: Calls outsub(0, &s).
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r = outsub(n, &s): Writes up to 128 characters of null-terminated
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string s to the screen, starting at position n.
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Returns position of null terminator in string.
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Note: Calls putchr() in a loop.
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r = putstr(&s): Writes up to 128 characters of null-terminated
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string s to the screen and advances the cursor to
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the beginning of the next line.
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Returns number of characters printed.
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Note: Calls outstr(&s) followed by newlin().
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Note: This library expects the following functions to be defined:
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getkey(); Wait for and read ASCII character from keyboard
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prchr(); Print ASCII character to screen
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delchr(); Backspace and delete previous character on screen
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newlin(); Advance cursor to beginning of next line
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along with the sequential Zero Page locations
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strlo: String Pointer (low byte)
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strhi: String Pointer (high byte)
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and the assembler constants
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DELKEY Delete/Backspace key ASCII code (usually DEL or BS)
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ESCKEY Escape/Abort key ASCII code (usually ESC)
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RTNKEY Return/Enter key ASCII code (usually CR)
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