QSORT(3F)QSORT(3F)NAME
qsort, qsort64 - quick sort
SYNOPSIS
integer*4 len, isize
integer*8 len8, isize8
external compar
integer*2 compar
subroutine qsort (array, len, isize, compar)
subroutine qsort64(array,len8, isize8, compar)
DESCRIPTION
One-dimensional array contains the elements to be sorted. len (or
len8) is the number of elements in the array. isize (or isize8) is the
size of an element, typically:
4 for integer and real (or 4_8 with qsort64)
8 for double precision or complex (or 8_8 with qsort64)
16 for double complex (or 16_8 with qsort64)
or the length of a character element (in bytes) for character
arrays
compar is the name of a user-supplied INTEGER*2 function that deter‐
mines the sorting order. This function is called with two arguments
that are elements of array. The function must return:
negative if arg1 is considered to precede arg2
zero if arg1 is equivalent to arg2
positive if arg1 is considered to follow arg2
On return, the elements of array are sorted.
Use qsort64 in 64-bit environments where the size of the array (or
character array element) exceeds 2 Gigabytes and can only be specified
with an INTEGER*8 value.
NOTES
When using qsort64, be sure to specify the element size, isize8, and
the array length, len8, as INTEGER*8 data. Specify INTEGER*8 constants
using the Fortran 90 syntax, for example 8_8, as in:
integer*8 LENARRAY, ARRAY(large_number)
integer*2 ORDER
external ORDER
...
call qsort64(ARRAY, LENARRAY, 8_8, ORDER)
FILES
libfui.a
SEE ALSOqsort(3c)
2003/02/25 QSORT(3F)
