number_of_columns: use getline instead of non-advancing io

Author: perazz

src/stdlib_io.fypp

@@ -252,6 +252,7 @@ contains
 
  integer :: ios, skiprows_, i
  character :: c
+ character(len=:), allocatable :: line
  logical :: lastblank
 
  skiprows_ = optval(skiprows, 0)
@@ -261,12 +262,16 @@ contains
  do i = 1, skiprows_
  read(s, *)
  end do
-
+ 
  number_of_columns = 0
+ 
+ ! Read first non-skipped line as a whole
+ call getline(s, line, ios)
+ if (ios/=0 .or. .not.allocated(line)) return
+
  lastblank = .true.
- do
- read(s, '(a)', advance='no', iostat=ios) c
- if (ios /= 0) exit
+ do i = 1,len(line)
+ c = line(i:i)
  if (lastblank .and. .not. is_blank(c)) number_of_columns = number_of_columns + 1
  lastblank = is_blank(c)
  end do