Escapes the special characters '\b', '\f', '\n', '\r', '\t', '\v', '\' and '"' in the string source by inserting a
'\' before them.
Additionally all characters in the range 0x01-0x1F (everything below SPACE) and in the range 0x7F-0xFF (all non-ASCII chars) are
replaced with a '\' followed by their octal representation. Characters supplied in exceptions are not escaped.
compress does the reverse conversion.
| exceptions |
a string of characters not to escape in |
| source |
a string to escape |
|
a newly-allocated copy of |