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C     Substring range checking test program, to check behavior with respect

C     to X3J3/90.4 paragraph 5.7.1.

C

C     Patches relax substring checking for subscript expressions in order to

C     simplify coding (elimination of length checks for strings passed as

C     parameters) and to avoid contradictory behavior of subscripted substring

C     expressions with respect to unsubscripted string expressions.

C

C     Key part of 5.7.1 interpretation comes down to statement that in the

C     substring expression,

C        v ( e1 : e2 )

C     1 <= e1 <= e2 <= len to be valid, yet the expression

C        v ( : )

C     is equivalent to

C        v(1:len(v))

C

C     meaning that any statement that reads

C        str = v // 'tail'

C     (where v is a string passed as a parameter) would require coding as

C        if (len(v) .gt. 0) then

C           str = v // 'tail'

C        else

C           str = 'tail'

C        endif

C     to comply with the standard specification.  Under the stricter

C     interpretation, functions strcat and strlat would be incorrect as

C     written for null values of str1 and/or str2.

C

C     This code compiles and runs without error on

C       SunOS 4.1.3 f77 (-C option)

C       SUNWspro SPARCcompiler 4.2 f77 (-C option)

C       (and with proposed patches, gcc-2.9.2 -fbounds-check except for test 6,

C        which is a genuine, deliberate error - comment out to make further

C        tests)

C

C { dg-do run }

C { dg-options "-fbounds-check" }

C

C     G. Helffrich/Tokyo Inst. Technology Jul 24 2001

      character str*8,strres*16,strfun*16,strcat*16,strlat*16

      str='Hi there'

C     Test 1 - (current+patched) two char substring result

      strres=strfun(str,1,2)

      write(*,*) 'strres is ',strres

C     Test 2 - (current+patched) null string result

      strres=strfun(str,5,4)

      write(*,*) 'strres is ',strres

C     Test 3 - (current+patched) null string result

      strres=strfun(str,8,7)

      write(*,*) 'strres is ',strres

C     Test 4 - (current) error; (patched) null string result

      strres=strfun(str,9,8)

      write(*,*) 'strres is ',strres

C     Test 5 - (current) error; (patched) null string result

      strres=strfun(str,1,0)

      write(*,*) 'strres is ',strres

C     Test 6 - (current+patched) error

C     strres=strfun(str,20,20)

C     write(*,*) 'strres is ',strres

C     Test 7 - (current+patched) str result

      strres=strcat(str,'')

      write(*,*) 'strres is ',strres

C     Test 8 - (current) error; (patched) str result

      strres=strlat('',str)

      write(*,*) 'strres is ',strres

      end

      character*(*) function strfun(str,i,j)

      character str*(*)

      strfun = str(i:j)

      end

      character*(*) function strcat(str1,str2)

      character str1*(*), str2*(*)

      strcat = str1 // str2

      end

      character*(*) function strlat(str1,str2)

      character str1*(*), str2*(*)

      strlat = str1(1:len(str1)) // str2(1:len(str2))

      end