UTF-8 characters are dropped in the database

[dajoha]

I have the given folder in my filesystem:

/home/io/projets/fanfare-ligugé

But in the ASH sqlite database, the accentuated character é of the folder name has been dropped everywhere.

I.e., the cwd value is:

/home/io/projets/fanfare-ligug

The following columns of the table commands have this kind of issue:

• cwd
• command

I have checked many entries in the table commands, and I can notice that all accentuated characters have been dropped.

[dajoha]

I managed to fix the issue by tweaking the method DBObject::quote() in database.cpp, but I'm not good in C++, and I guess this is not the right way to handle utf-8 characters...

diff --git a/src/database.cpp b/src/database.cpp
index 08c47e8..82059e6 100644
--- a/src/database.cpp
+++ b/src/database.cpp
@@ -457,28 +457,28 @@ const string DBObject::quote(const char * value) {
 /**
  * Returns a quoted string suitable for insertion into the DB.
  * Converts an empty string to null.  Removes unprintable characters.
  * Replaces all single-quotes with double single quotes in the output string.
  */
 const string DBObject::quote(const string & in) {
   if (in.empty()) return "null";
   string out = "'";
-  char c;
+  unsigned char c;
   for (string::const_iterator i = in.begin(), e = in.end(); i != e; ++i) {
     c = *i;
     switch (c) {
       case '\n':  // fallthrough
       case '\t':
         out.push_back(c);
         break;
       case '\'':
         out.push_back(c); // fallthrough
       default:
-        if (isprint(c)) out.push_back(c);
+        if (c >= 0x20 && c != 0x7f) out.push_back(c);
     }
   }
   out.push_back('\'');
   return out;
 }

Would this patch be eligible for a PR?
Or what else could be done in order to fix this issue?