Convert to ASCII 7-bit
txt = tools.ascii(txt, [contrls])
txt = tools.ascii(txt, [keep])
txt = tools.ascii(txt, [bitfield])
Convert 8-bit text to ASCII 7-bit by stripping bit 7 (AND with 0x7f).
| Parameter | Type | Description |
|---|---|---|
txt |
string | The text to modify |
controls |
boolean | True = keep controls characters; False = remove controls (except CR/LF/FF/BS/TAB) |
keep |
string | Control characters to keep |
bitfield |
integer | Bitfield of characters 0-31 to keep. |
| Returns | Type | Description |
|---|---|---|
txt |
string | Modified string |
e.g.
local s = tools.ascii(s, '\r\n') -- keep just CR + LF
local s = tools.ascii(s, 0x00002400) -- bits 10 + 13 = keep CR + LF