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Updated docs for modules block, stdiox, memory
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Curtis F Kaylor
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Block Memory Functions
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This library contains functions for accessing data in blocks of memory.
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A block consists of up to 65,535 contiguous bytes. This allows for the
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storage, retrieval, and manipulation of data exceeding the maximum
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array length of 255.
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This library contains functions and variables for accessing data in
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blocks of memory. A block consists of up to 65,535 contiguous bytes.
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This allows for the storage, retrieval, and manipulation of data
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exceeding the maximum array length of 255.
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These functions assume that a block is divided into equally sized segments
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of up to 255 bytes in length. Data in the block is accessed by copying
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data into and out of arrays with the same length as the segment size.
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A segment consists of a string field, which is used as a key, followed
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by a number of individual bytes. For example, the segments in a variable
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table might be 9 bytes long, consisting of a 7 byte variable name string
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(6 characters plus a terminator), the variable type (at index 7) and
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the variable length (at index 8).
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A segment typically consists of a string field, which is used as a key,
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followed by a number of mixed type fields. For example, the segments in a
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variable table might be 9 bytes long, consisting of a 7 byte variable name
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string (6 characters plus a terminator), the variable type (at index 7)
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and the variable length (at index 8).
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Usage: at the beginning of the program use the directives
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@ -22,67 +22,56 @@ Usage: at the beginning of the program use the directives
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#include <string.h02>
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#include <block.h02>
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The following application variables are defined:
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int blkbgn; Start address of the block.
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int blkend; End address of the block.
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int blklen: Size of Segments in the block.
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These variables must be assigned before calling
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any of the functions in this module. They may be
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reassigned at any time, allowing the program to
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access different blocks.
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Note: Although a block usually begins and ends
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on a 256 byte boundary, this is not required.
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int blkptr; Pointer to the next segment. This can be reset
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to blkbgn using the blkrst() function.
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To preserve the segment position, this value must
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be saved before reassigning to another block, then r
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estored when reassigning back to the original block.
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The following application functions are defined:
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blkbgn(&b); Block Begin: Set beginning of block to address b.
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The beginning of a block is the first byte of memory
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in the block.
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Although a block usually begins on a 256 byte
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boundary, this is not required.
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Note: Sets variables blkslo and blkshi.
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blkend(&e); Block End: Set end of block to address b. The end of
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a block is the byte after the last byte of memory in
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the block.
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Although a block usually ends on a 256 byte
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boundary, this is not required.
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Note: Sets variables blkelo and blkehi.
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blkseg(n); Block Segment: Set block segment size to n.
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Required before calls any calls that manipulate
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block segments.
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Note: Sets blklen to n.
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blkset(c); Block Set: Fills entire block with character c,
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leaving block pointer at end of block.
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Should be called with an argument of 0, to initialize
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a block before use.
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blkrst(); Block Reset: Sets block segment pointer to block
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begin address.
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blkrst(); Block Reset: Sets block pointer to first segment.
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This routine is called before populating a block with
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calls to the blkput function.
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blkptr(&d); Block Pointer: Sets the block pointer to the address
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of b.
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Does not validate that the address is within the
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beginning and ending address of the block.
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Note: Sets variables blkslo and blkshi.
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blknxt(); Block Next: Moves block pointer forward by the segment
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length set by a prior blkseg call.
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blknxt(); Block Next: Moves the block pointer to the bext
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segment.
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If the block pointer is moved past the end of the
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block, or the segmebt length is set to 0, a value of
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block, or the segment length is set to 0, a value of
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#TRUE is returned. Otherwise, a value of #FALSE is
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returned.
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blkprv(); Block Previous: Moves block pointer backward by the
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segment length set by a prior blkseg call.
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If the block pointer is moved past the beginning of
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the block, or the segmebt length is set to 0, a value
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the block, or the segment length is set to 0, a value
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of #TRUE is returned. Otherwise, a value of #FALSE is
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returned.
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@ -202,17 +202,21 @@ The following functions are defined:
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%% - output a single % character
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%N - generate a newline
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Four additional formatting tags operate on the
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Additional formatting tags operate on the
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destination pointer:
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%S - output the destination string
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%I - output the destination address as a
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as a one to five digit decimal number
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%J - output the destination address as a
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right justified decimal number
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%Q - output the destination address as a
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as a three-digit hexadecimal number
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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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%S - output destination string
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%P - output destination string padded with
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spaces to length b
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%I - output destination address as one to
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five digit decimal number
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%J - output destination address as right
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justified decimal number
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%Q - output destination address as
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three-digit hexadecimal number
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%W - output destination address as
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four-digit hexadecimal number
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%E - output b and destination address as
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six-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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@ -104,16 +104,17 @@ The following functions are defined:
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Note: This library expects the following functions to be defined:
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ext(); External function description
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getdst(); Get Destination Pointer
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getsrc(); Get Source Pointer
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resrxy(); Restore X and Y Registers
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savrxy(); Save X and Y Registers
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along with the zero page variables
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zpage0,zpage1: Zero page variable pair
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dstptr,srcptr: Destination and Source Pointer
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the external variables
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and the external variables
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exvar0,exvar1: External variable pair
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xmaddr,xmbank; Extended Memory Address and Bank
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temp1,temp2: Temporary storage
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and the constants
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#CNSTNAME Constant description
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