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CVS: cvs.openbsd.org: src

Module name:	src
Changes by:	espie_(_at_)_cvs_(_dot_)_openbsd_(_dot_)_org	2000/07/01 19:17:00

Modified files:
	usr.bin/m4     : extern.h main.c mdef.h misc.c 

Log message:
Make the m4 machine stack dynamically sized.

Fix strspace automatic extension.
The assumption that simply updating the current pointer works is false,
there are cases where previous entries on the stack would absorp vast
amounts of string space, and overload the non-updated entries.

To fix it, we use a shadow copy of the stack, which only records which
entries are pointers within strspace, so that a resize can adjust all
those pointers at once.

Reviewed by millert@