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deraadt 2024-08-18 22:06:40 +00:00
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usr.bin/m4/NOTES
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@ -1,8 +1,8 @@
m4 - macro processor
PD m4 is based on the macro tool distributed with the software
tools (VOS) package, and described in the "SOFTWARE TOOLS" and
"SOFTWARE TOOLS IN PASCAL" books. It has been expanded to include
PD m4 is based on the macro tool distributed with the software
tools (VOS) package, and described in the "SOFTWARE TOOLS" and
"SOFTWARE TOOLS IN PASCAL" books. It has been expanded to include
most of the command set of SysV m4, the standard UN*X macro processor.
Since both PD m4 and UN*X m4 are based on SOFTWARE TOOLS macro,
@ -31,12 +31,12 @@ References:
Implementation Notes:
[1] PD m4 uses a different (and simpler) stack mechanism than the one
described in Software Tools and Software Tools in Pascal books.
The triple stack thing is replaced with a single stack containing
the call frames and the arguments. Each frame is back-linked to a
previous stack frame, which enables us to rewind the stack after
each nested call is completed. Each argument is a character pointer
[1] PD m4 uses a different (and simpler) stack mechanism than the one
described in Software Tools and Software Tools in Pascal books.
The triple stack thing is replaced with a single stack containing
the call frames and the arguments. Each frame is back-linked to a
previous stack frame, which enables us to rewind the stack after
each nested call is completed. Each argument is a character pointer
to the beginning of the argument string within the string space.
The only exceptions to this are (*) arg 0 and arg 1, which are
the macro definition and macro name strings, stored dynamically