retroforth/example/net_fetch.forth

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# net:fetch
This is a simple wrapper over `curl` (https://curl.haxx.se). It
uses the `unix:popen` word to initiate a pipe to curl and stores
the returned data into a buffer.
This takes in three values:
- the URL to fetch
- the destination buffer
- a maximum number of bytes to read
The buffer should be at least one cell longer than the max to
allow for the NULL termination.
## The Code
~~~
:net:fetch (san-n)
[ [ buffer:set
'curl_-s_%s s:format file:R unix:popen ] dip
[ dup file:read 0; buffer:add ] times unix:pclose
buffer:start s:length ] buffer:preserve ;
~~~
## Test Case
```
'Data d:create #256001 allot
'https://www.osnews.com Data #300009 net:fetch
'%n_bytes_read\n s:format s:put
```