SBUFF Module

This module contains routines to access and manipulate the string buffer.

• The string buffer is 256 bytes long and can hold up to 255 characters plus a null terminator.
• It is used for building strings of arbitrary length.
• It is stored in the BASIC buffers page, which is temporarily mapped into bank 3 by the routines.

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sbuff_create_string

Clobbers	A,B,C,D

Action: Creates a BASIC temporary string from the contents of the string buffer.

• Leaves pointer to string descriptor in FAC.

Examples: call sbuff_create_string

Creates temporary string.

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sbuff_get_len

Output	A,_BC: String length
Clobbers	DE:

Action: Returns the current length of the string being built in the buffer.

• The length is returned in registers A and C.

Examples:

 call sbufgetlen
 ld   (binlen),bc

Gets the length of the string and stores it in main memory.

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sbuff_read_byte

Input	E: Buffer offset
Output	A,C: Byte read
Clobbers	DE

Action: Reads a byte from the string buffer.

• Register

Examples:

code

Explanation

routine_name

Input	R:
	R:
Output	R:
	R:
Clobbers	R:

Action:

Examples:

code

Explanation

routine_name

Input	R:
	R:
Output	R:
	R:
Clobbers	R:

Action:

Examples:

code

Explanation

routine_name

Input	R:
	R:
Output	R:
	R:
Clobbers	R:

Action:

Examples:

code

Explanation