WRAP2
Break Up Long Lines in a File

WRAP2 is a C++ program which reads a file and makes a copy in which long lines have been broken up. A line is "wrapped" if its length would exceed a given maximum. Unlike the WRAP program, this program will wrap the line before the maximum length is reached, if that will help avoid breaking up words.

Usage:

wrap2 old new wrap_length

• old is the file to be modified;
• new is the modified copy of the old file.
• wrap_length is the maximum line length in characters.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

WRAP2 is available in a C++ version.

Related Data and Programs:

CR2CRLF a C++ program which reads a text file and replaces carriage returns by carriage returns + line feeds.

CR2LF, a C++ program which reads a text file and replaces carriage returns by line feeds.

CRRM, a C++ program which reads a text file and writes a copy which has no carriage returns.

DEBLANK, a C++ program which makes a copy of a text file in which blank lines have been removed.

DECOMMENT, a C++ program which makes a copy of a text file which contains no "comment" lines (that begin with "#").

FILUM, a C++ library which performs various operations on files.

REFORMAT, a FORTRAN90 program which reads a file that contains only real values, and writes a copy which has a fixed number of real values on each line.

REWORD, a C++ program which makes a copy of a file in which each line has the same number of "words".

UNCONTROL, a C++ program which makes a copy of a text file which contains no control characters.

WRAP, a C++ program which makes a copy of a text file in which long lines have been wrapped.

Source Code:

• wrap2.cpp, the source code;

Examples and Tests:

• gettysburg.txt, Lincoln's Gettysburg Address, stored as a long line, a blank line, a long line, a blank line, and a very long line.
• gettysburg_80.txt, the same file, wrapped to 80 characters maximum.
• gettysburg_50.txt, the same file, wrapped to 50 characters maximum.
• gettysburg_30.txt, the same file, wrapped to 30 characters maximum.

List of Routines:

• MAIN is the main program for WRAP2.
• HANDLE makes a copy of a file in which no line exceeds a given length.
• S_LEN_TRIM returns the length of a string to the last nonblank.
• S_TO_I4 reads an integer value from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the C++ source codes.