`desing/writef`
Writing out long lines in a file wrapped at the given maximal length.
- Input:
-
- fd
- the descriptor of the target file,
- a
- a name, the text to be written in the file,
- b
- a positive integer, the maximal length of lines.
- Output:
- -
This procedure is used in
`desing/chtohtml` to break long lines
into ones that fit better on the screen.