dtos copies its standard input to standard output, converting Fortran double-precision constants, built-in functions, and type declarations to single precision.
Floating-point FORMAT specifications are left intact; on some ancient systems, they may require modifications. They do not under the rules of Fortran 77.
Leading tabs are correctly interpreted according to common extended Fortran rules.
dtos's other purpose is to demonstrate a modest lex(1) program.
The input files should not contain any text past column 72; if they do, that text may be incorrectly wrapped onto continuation lines.
dtos does not understand Fortran string constants, and may incorrectly do substitutions inside them. It is always a good idea to use diff(1) on the input and output files before accepting the conversion as correct.
dtos does not handle embedded ASCII tab characters correctly when long lines are to be broken. A Fortran-sensitive detabbing utility should be applied first if the input file possibly contains embedded tabs. Note that expand(1) cannot be used to do this job correctly!
Similarly, multi-line strings may be disturbed if the processing changes their length, necessitating generation of an intermediate continuation line. Such instances are usually rare, and can be patched by hand.
Center for Scientific Computing
Department of Mathematics
South Physics Building
University of Utah
Salt Lake City, UT 84112
Tel: (801) 581-5254
FAX: (801) 581-4148
Email: <beebe@science.utah.edu>