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 two other options applicable to cweave only: -f means do not force a newline after every statement in the formatted output. -x means omit the index and table of contents.
In addition to these options the Amiga version of cweave has three more options: +a causes Amiga-specific type identifiers to be recognized as keywords (e.g. UWORD). +g means that the German CWEB macros should be used instead of the English ones. -i causes parameter declarations at function heads not to be indented.