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Wrapping Output Lines

   Output that goes through `printf_filtered' or `fputs_filtered' or
`fputs_demangled' needs only to have calls to `wrap_here' added in
places that would be good breaking points.  The utility routines will
take care of actually wrapping if the line width is exceeded.

   The argument to `wrap_here' is an indentation string which is printed
*only* if the line breaks there.  This argument is saved away and used
later.  It must remain valid until the next call to `wrap_here' or
until a newline has been printed through the `*_filtered' functions.
Don't pass in a local variable and then return!

   It is usually best to call `wrap_here()' after printing a comma or
space.  If you call it before printing a space, make sure that your
indentation properly accounts for the leading space that will print if
the line wraps there.

   Any function or set of functions that produce filtered output must
finish by printing a newline, to flush the wrap buffer, before
switching to unfiltered ("`printf'") output.  Symbol reading routines
that print warnings are a good example.