Major over-haul of smb_util.c and most everything that uses it:
Constified the arguments. Created exascii_to_ascii_char(). Created ctrl_a_to_ascii_char(). strip_ctrl() and prep_file_desc() now takes 2 args. strip_ctrl(), strip_exascii() and prep_file_desc() now strdup() the input string and if the dest arg is NULL, returns the allocated and modified copy. sbbs_t::bputs() now handles ^AZ. Change Ctrl-A code message network exporting: 1. ^AL, ^A<, ^A[, and ^A] are always translated to ASCII equivalents. 2. ^AZ will terminate the message body prematurely if found. 3. Ex-ASCII (CP437) chars will be translated to ASCII equivalents (rather than '*') for "ASCII Only" subs. For import, don't allow Ctrl-AP or Ctrl-AL. For SBBSecho: Added support for specifying a link's address on the command-line (e.g. for use with -h). Mail server now strips Ctrl-A codes from message bodies for sending via POP3 or SMTP.
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