github.com/benhoyt/goawk@v1.8.1/testdata/t.format4 (about)

     1  BEGIN {
     2  text=sprintf ("%125s", "x")
     3  print length (text)
     4  print text
     5  xxx=substr (text,1,105)
     6  print length (xxx)
     7  print xxx
     8  exit
     9  }