https://github.com/jrincayc/ucblogo-code
Tip revision: e494a4e0c0e335b25b7436b36075800bcc1657c0 authored by Dan Malec on 05 September 2024, 01:42:59 UTC
Merge pull request #185 from jrincayc/artifacts
Merge pull request #185 from jrincayc/artifacts
Tip revision: e494a4e
setwrite
SETWRITE filename
command. Makes the named file the write stream, used for PRINT,
etc. The file must already be open with OPENWRITE, OPENAPPEND, or
OPENUPDATE. If the input is the empty list, then the write stream
becomes the screen, as usual. Changing the write stream does
not close the file that was previously the write stream, so it is
possible to alternate between files.
If the input is a list, then its first element must be a variable
name, and its second and last element must be a positive integer; a
buffer of that many characters will be allocated, and will become the
writestream. If the same list (same in the .EQ sense, not a copy)
has been used as input to OPENWRITE, then the already-allocated
buffer will be used, and the writer can be changed to and from this
buffer, with all the characters accumulated as in a file. When the
same list is used as input to CLOSE, the contents of the buffer
(as an unparsed word, which may contain newline characters) will
become the value of the named variable. For compatibility with
earlier versions, if the list has not been opened when the SETWRITE
is done, it will be opened implicitly, but the first SETWRITE after
this one will implicitly close it, setting the variable and freeing
the allocated buffer.