[agroal#337] Fix compilation problems

As reported in CI test failures
<agroal#336 (comment)>
and
<agroal#336 (comment)>
the system does not compile under GCC 12 with `-Werror` option.

This commit fixes the string length problem reported by gcc.

Close agroal#337

src/libpgagroal/configuration.c

@@ -3781,7 +3781,7 @@ to_string(char* where, char* value)
    bool has_double_quotes = false;
    bool has_single_quotes = false;
 
-   if (!where || !value || strlen(value) > MISC_LENGTH)
+   if (!where || !value || strlen(value) >= MISC_LENGTH)
    {
       return 1;
    }
@@ -3807,18 +3807,24 @@ to_string(char* where, char* value)
 
    if (needs_quotes)
    {
+      // there must be space for quotes
+      if (strlen(value) > MISC_LENGTH - 2 - 1)
+      {
+         return 1;
+      }
+
       if (!has_single_quotes)
       {
-         snprintf(where, MISC_LENGTH, "'%s'", value);
+         snprintf(where, MISC_LENGTH - 1, "'%s'", value);
       }
       else if (!has_double_quotes)
       {
-         snprintf(where, MISC_LENGTH, "\"%s\"", value);
+         snprintf(where, MISC_LENGTH - 1, "\"%s\"", value);
       }
    }
    else
    {
-      snprintf(where, MISC_LENGTH, "%s", value);
+      snprintf(where, MISC_LENGTH - 1, "%s", value);
    }
 
    return 0;