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CWEB(1)								       CWEB(1)

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 informa‐
       tion that it gathers automatically.

       CWEB allows you to prepare a single document containing all the	infor‐
       mation  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.

FILES
       The location of the files mentioned below varies from system to system.
       Use the kpsewhich utility to find their locations.

       cwebmac.tex
	      TeX macros used by cweave output.

       cwebman.tex
	      The user manual.

SEE ALSO
       Literate Programming
	      by D. E. Knuth.

       Weaving a Program
	      by Wayne Sewell.

       The CWEB System of Structured Documentation
	      by Donald E. Knuth and Silvio Levy (hardcopy  version  of	 cweb‐
	      man.tex and the source code listings).

       tex(1), cc(1).

AUTHORS
       Don  Knuth  wrote  WEB  for  TeX	 and Pascal.  Silvio Levy designed and
       developed CWEB by adapting the WEB conventions  to C  and  by  recoding
       everything  in  CWEB.   Knuth began using CWEB and made further refine‐
       ments.  Many other helpers are acknowledged in the CWEB manual.

Web2C 2017			 7 April 2010			       CWEB(1)
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