Reference for package '#rtl'

IndexByte

Search for a byte in a memory range.

Declaration

Source position: systemh.inc line 876

  function IndexByte(const buf; len: SizeInt; b: Byte) : SizeInt;

Description

IndexByte searches the memory at buf for maximally len positions for the byte b and returns it's position if it found one. If b is not found then -1 is returned. The position is zero-based.

Errors

Buf and Len are not checked to see if they are valid values.

See also

Name Description
CompareByte Compare 2 memory buffers byte per byte
IndexChar Search for a character in a memory range.
IndexDWord Search for a DWord value in a memory range.
IndexWord Search for a WORD value in a memory range.

Example

Program Example105;
{ Program to demonstrate the IndexByte function. }
Const
  ArraySize = 256;
  MaxValue = 256;
Var
  Buffer : Array[1..ArraySize] of Byte;
  I,J : longint;
  K : Byte;
begin
  Randomize;
  For I:=1 To ArraySize do
    Buffer[I]:=Random(MaxValue);
  For I:=1 to 10 do
    begin
    K:=Random(MaxValue);
    J:=IndexByte(Buffer,ArraySize,K);
    if J=-1 then
      Writeln('Value ',K,' was not found in buffer.')
    else
      Writeln('Found ',K,' at position ',J,' in buffer');
    end;
end.