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- ConvChar is a DOS filter that reads and copies its input from stdin to
- stdout, converting a selected character to another in the copy operation.
- It requires two arguments, the decimal values of the characters to convert.
- As with all DOS filters, you must supply at least the input file or source
- to read the characters, or it will read from stdin, the keyboard.
-
- Running ConvChar without its two required parameters gives a help message:
-
- ConvChar is a DOS filter to convert single character values globally
- to another character value. Usage:
-
- ConvChar fromchar tochar <source >dest Where:
-
- fromchar is the decimal value of the character to convert
- tochar is the decimal value of the character to replace
- source is the Ascii source file
- dest is the Ascii destination file
-
- ConvChar 0 255 <olddoc >newdoc
- Reads & copies OLDDOC file to NEWDOC, converting chars valued 0 to value 255
-
- ConvChar 255 0 <newdoc >newerdoc
- Reverses above, reads NEWDOC, converts 255 value chars back to 0 on NEWERDOC
-
- DIR /W | ConvChar 9 32
- Converts all tab chars from DIR /W (value 9) to a single space (value 32)
-
-
- ConvChar was written by Steve Kraus as a utility in response to a question:
- How do you run DIFF on a file with embedded [NUL] characters? The answer
- is to run the source document(s) through some kind of preprocessor to
- convert all those NUL characters to some other character value. If you
- have some kind of formatted document created by a word processor that
- leaves NUL value formatting codes embedded in the output, DIFF will treat
- those embedded NUL (0 value) characters as end of strings.
-
- This isn't exactly an elegant solution, but it works. If you wish to
- convert two files with embedded NULS: MyDoc1.PRN and MyDoc2.PRN, first
- convert both files to temporary files for comparison. Use ConvChar to
- change the NUL chars to 255, which usually displays and prints as a space.
- (I use 255, but experiment with your own character value). Run the
- resulting files through DIFF, then convert the change bar file generated,
- changing 255 valued characters back to 0 for printing. It will probably be
- necessary to fix the change bar locations in the resulting file, because
- DIFF treats 255 valued characters as if they occupy a space.
-
- ConvChar 0 255 <MyDoc1.PRN >MyDoc1 <-- convert & copy MyDoc1 & 2
- ConvChar 0 255 <MyDoc2.PRN >MyDoc2
- DIFF -b 78 MyDoc1 MyDoc2 BarDoc <-- compare & make a change
- bar file
- ConvChar 255 0 <BarDoc >BarDoc.PRN <-- convert embedded 255 chars
- back to NUL (0) for printing
- ZDEL MyDoc1 MyDoc2 BarDoc <-- delete scratch files
-
- This utility is hereby released into public domain. Have fun,
- Steve Kraus - 12 June 1989.
-