#### Description:

Find the length
(*i.e.* position of the last non blank character) in a FORTRAN string. This is not
necessarily the same as the value of source_len as trailing blanks are not counted.

#### Invocation

result = cnfLenf( source_f, source_len )

#### Arguments

##### const char
$\ast $source_f
(Given)

A pointer to the input FORTRAN string

##### int source_len (Given)

The length (including
trailing blanks) of the input FORTRAN string

#### Returned Value

##### int cnfLenf

The length (excluding
trailing blanks) of the input FORTRAN string.

#### Notes:

This routine follows the FORTRAN
convention of counting positions from one, so with an input string of `’ABCD’`

the value returned
would be 4.