STRUCT(1) STRUCT(1)
NAME
struct - structure Fortran programs
SYNOPSIS
struct [ option ] ... file
DESCRIPTION
Struct translates the Fortran program specified by file (standard input
default) into a Ratfor program. Wherever possible, Ratfor control con-
structs replace the original Fortran. Statement numbers appear only
where still necessary. Cosmetic changes are made, including changing
Hollerith strings into quoted strings and relational operators into
symbols (.e.g. `.GT.' into `>'). The output is appropriately indented.
The following options may occur in any order.
-s Input is accepted in standard format, i.e. comments are speci-
fied by a c, C, or * in column 1, and continuation lines are
specified by a nonzero, nonblank character in column 6. Nor-
mally, a statement whose first nonblank character is not
alphanumeric is treated as a continuation.
-i Do not turn computed goto statements into switches. (Ratfor
does not turn switches back into computed goto statements.)
-a Turn sequences of else ifs into a non-Ratfor switch of the form
switch {
case pred1: code
case pred2: code
case pred3: code
default: code
}
The case predicates are tested in order; the code appropriate to
only one case is executed. This generalized form of switch
statement does not occur in Ratfor.
-b Generate goto's instead of multilevel break statements.
-n Generate goto's instead of multilevel next statements.
-en If n is 0 (default), place code within a loop only if it
can lead to an iteration of the loop. If n is nonzero,
admit code segments with fewer than n statements to a
loop if otherwise the loop would have exits to several
places including the segment, and the segment can be
reached only from the loop.
FILES
/tmp/struct*
/usr/lib/struct/*
SEE ALSO
f77(1)
BUGS
Struct knows Fortran 66 syntax, but not full Fortran 77 (alter-
nate returns, IF...THEN...ELSE, etc.)
If an input Fortran program contains identifiers which are
reserved words in Ratfor, the structured version of the program
will not be a valid Ratfor program.
Extended range DO's generate cryptic errors.
Columns 73-80 are not special even when -s is in effect.
Will not generate Ratfor FOR statements.
STRUCT(1)
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