usr/man/cat1/struct.0



STRUCT(1)           UNIX Programmer's Manual            STRUCT(1)


N\bNA\bAM\bME\bE
     struct - structure Fortran programs

S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
     s\bst\btr\bru\buc\bct\bt [ option ] ...  file

D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
     _\bS_\bt_\br_\bu_\bc_\bt translates the Fortran program specified by _\bf_\bi_\bl_\be
     (standard input default) into a Ratfor program.  Wherever
     possible, Ratfor control constructs replace the original
     Fortran.  Statement numbers appear only where still neces-
     sary.  Cosmetic changes are made, including changing Holler-
     ith 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.

     -\b-s\bs   Input is accepted in standard format, i.e.  comments
          are specified by a c, C, or * in column 1, and con-
          tinuation lines are specified by a nonzero, nonblank
          character in column 6.  Normally input is in the form
          accepted by _\bf_\b7_\b7(1)

     -\b-i\bi   Do not turn computed goto statements into switches.
          (Ratfor does not turn switches back into computed goto
          statements.)

     -\b-a\ba   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 gen-
          eralized form of switch statement does not occur in
          Ratfor.

     -\b-b\bb   Generate goto's instead of multilevel break statements.

     -\b-n\bn   Generate goto's instead of multilevel next statements.

     -\b-t\bt_\bn  Make the nonzero integer _\bn the lowest valued label in
          the output program (default 10).

     -\b-c\bc_\bn  Increment successive labels in the output program by


Printed 7/9/88           April 29, 1985                         1


STRUCT(1)           UNIX Programmer's Manual            STRUCT(1)


          the nonzero integer _\bn (default 1).

     -\b-e\be_\bn  If _\bn is 0 (default), place code within a loop only if
          it can lead to an iteration of the loop.  If _\bn is
          nonzero, admit a small code segments to a loop if oth-
          erwise the loop would have exits to several places
          including the segment, and the segment can be reached
          only from the loop.  `Small' is close to, but not equal
          to, the number of statements in the code segment.
          Values of n under 10 are suggested.

F\bFI\bIL\bLE\bES\bS
     /tmp/struct*
     /usr/lib/struct/*

S\bSE\bEE\bE A\bAL\bLS\bSO\bO
     f77(1)

B\bBU\bUG\bGS\bS
     Struct knows Fortran 66 syntax, but not full Fortran 77.
     If an input Fortran program contains identifiers which are
     reserved words in Ratfor, the structured version of the pro-
     gram will not be a valid Ratfor program.
     The labels generated cannot go above 32767.
     If you get a goto without a target, try -\b-e\be .\b.


Printed 7/9/88           April 29, 1985                         2