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PROGRAM:

NAME

ctangle, cweave - translate CWEB to C and/or TeX

SYNOPSIS

ctangle [-bhp] [+s] webfile[.w] [{changefile[.ch]|-} [outfile[.c]]]
cweave [-befhpx] [+s] webfile[.w] [{changefile[.ch]|-} [outfile[.tex]]]

DESCRIPTION

The ctangle program converts a CWEB source document into a C program that may be compiled
in the usual way. The output file includes #line specifications so that debugging can be
done in terms of the CWEB source file.

The cweave program converts the same CWEB file into a TeX file that may be formatted and
printed in the usual way. It takes appropriate care of typographic details like page
layout and the use of indentation, italics, boldface, etc., and it supplies extensive
cross-index information that it gathers automatically.

CWEB allows you to prepare a single document containing all the information that is needed
both to produce a compilable C program and to produce a well-formatted document describing
the program in as much detail as the writer may desire. The user of CWEB ought to be
familiar with TeX as well as C.

The command line should have one, two, or three names on it. The first is taken as the
CWEB file (and .w is added if there is no extension). If that file cannot be opened, the
extension .web is tried instead. (But .w is recommended, since .web usually implies
Pascal.) If there is a second name, it is a change file (and .ch is added if there is no
extension). The change file overrides parts of the WEB file, as described in the
documentation. If there is a third name, it overrides the default name of the output
file, which is ordinarily the same as the name of the input file (but on the current
directory) with the extension .c or .tex.

Options in the command line may be either turned off with - (if they are on by default) or
turned on with + (if they are off by default). In fact, the options are processed from
left to right, so a sequence like -f +f corresponds to +f (which is the default).

The -b option suppresses the banner line that normally appears on your terminal when
ctangle or cweave begins. The -h option suppresses the happy message that normally
appears if the processing was successful. The -p option suppresses progress reports
(starred module numbers) as the processing takes place. If you say -bhp, you get nothing
but error messages.

The +s option prints statistics about memory usage at the end of a run (assuming that the
programs have been compiled with the -DSTAT switch).

There are three other options applicable to cweave only: -f means do not force a newline
after every statement in the formatted output. -e inhibits the enclosure of C material
formatted by cweave in brackets \PB{...}. Such brackets are normally inserted so that
special hooks can be used by cweb-latex and similar programs. -x means omit the index and
table of contents.

ENVIRONMENT

The environment variable CWEBINPUTS is used to search for the input files, or the system
default if CWEBINPUTS is not set. See tex(1) for the details of the searching.

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