smtp-types 0.2.0

Misuse-resistant SMTP types
Documentation 
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use std::borrow::Cow;

pub(crate) fn escape_quoted(unescaped: &str) -> Cow<str> {
    let mut escaped = Cow::Borrowed(unescaped);

    if escaped.contains('\\') {
        escaped = Cow::Owned(escaped.replace('\\', "\\\\"));
    }

    if escaped.contains('\"') {
        escaped = Cow::Owned(escaped.replace('\"', "\\\""));
    }

    escaped
}