STRUCT(1) General Commands Manual STRUCT(1)
struct - structure Fortran programs
struct [ option ] ... file
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
case pred1: code
case pred2: code
case pred3: 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.
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.