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#!/usr/bin/mawk -f
# $MawkId: qsort.awk,v 1.4 2020/09/19 14:20:45 tom Exp $

# qsort text files

function middle(x,y,z)  #return middle of 3
{
  if ( x <= y )
  { if ( z >= y )  return y
    if ( z <  x )  return x
    return z
  }

if ( z >= x )  return x
  if ( z <  y )  return y
  return z
}

function  isort(A , n,    i, j, hold)
{
  # if needed a sentinel at A[0] will be created

for( i = 2 ; i <= n ; i++)
  {
    hold = A[ j = i ]
    while ( A[j-1] > hold )
    { j-- ; A[j+1] = A[j] }

A[j] = hold
  }
}

# recursive quicksort
function  qsort(A, left, right    ,i , j, pivot, hold)
{
  pivot = middle(A[left], A[int((left+right)/2)], A[right])

i = left
  j = right

while ( i <= j )
  {
    while ( A[i] < pivot )  i++
    while ( A[j] > pivot )  j--

if ( i <= j )
    { hold = A[i]
      A[i++] = A[j]
      A[j--] = hold
    }
  }

if ( j - left > BLOCK )  qsort(A,left,j)
  if ( right - i > BLOCK )  qsort(A,i,right)
}

BEGIN { BLOCK = 5 }

{ line[NR] = $0 ""   # sort as string
}

END  {

if ( NR > BLOCK )  qsort(line, 1, NR)

isort(line, NR)

for(ie = 1 ; ie <= NR ; ie++) print line[ie]
}