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man ctangle(1)
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CWEB(1)                                                                CWEB(1)


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


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


       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

       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.


       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.


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

              TeX macros used by cweave output.

              The user manual.


       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).


       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 2014                       7 April 2010                          CWEB(1)

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