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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 constructs replace the original For-
tran. 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 specified by a c, C, or *
in column 1, and continuation lines are specified by a nonzero, nonblank character
in column 6. Normally, a statement whose first nonblank character is not alphanu-
meric 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
Struct knows Fortran 66 syntax, but not full Fortran 77 (alternate returns,
If an input Fortran program contains identifiers which are reserved words in Rat-
for, 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.
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