lsame.f

          LOGICAL          FUNCTION LSAME( CA, CB )
    *
    *  -- LAPACK auxiliary routine (version 3.1) --
    *     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
    *     November 2006
    *
    *     .. Scalar Arguments ..
          CHARACTER          CA, CB
    *     ..
    *
    *  Purpose
    *  =======
    *
    *  LSAME returns .TRUE. if CA is the same letter as CB regardless of
    *  case.
    *
    *  Arguments
    *  =========
    *
    *  CA      (input) CHARACTER*1
    *  CB      (input) CHARACTER*1
    *          CA and CB specify the single characters to be compared.
    *
    * =====================================================================
    *
    *     .. Intrinsic Functions ..
          INTRINSIC          ICHAR
    *     ..
    *     .. Local Scalars ..
          INTEGER            INTA, INTB, ZCODE
    *     ..
    *     .. Executable Statements ..
    *
    *     Test if the characters are equal
    *
          LSAME = CA.EQ.CB
          IF( LSAME )
         $   RETURN
    *
    *     Now test for equivalence if both characters are alphabetic.
    *
          ZCODE = ICHAR( 'Z' )
    *
    *     Use 'Z' rather than 'A' so that ASCII can be detected on Prime
    *     machines, on which ICHAR returns a value with bit 8 set.
    *     ICHAR('A') on Prime machines returns 193 which is the same as
    *     ICHAR('A') on an EBCDIC machine.
    *
          INTA = ICHAR( CA )
          INTB = ICHAR( CB )
    *
          IF( ZCODE.EQ.90 .OR. ZCODE.EQ.122 ) THEN
    *
    *        ASCII is assumed - ZCODE is the ASCII code of either lower or
    *        upper case 'Z'.
    *
             IF( INTA.GE.97 .AND. INTA.LE.122 ) INTA = INTA - 32
             IF( INTB.GE.97 .AND. INTB.LE.122 ) INTB = INTB - 32
    *
          ELSE IF( ZCODE.EQ.233 .OR. ZCODE.EQ.169 ) THEN
    *
    *        EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
    *        upper case 'Z'.
    *
             IF( INTA.GE.129 .AND. INTA.LE.137 .OR.
         $       INTA.GE.145 .AND. INTA.LE.153 .OR.
         $       INTA.GE.162 .AND. INTA.LE.169 ) INTA = INTA + 64
             IF( INTB.GE.129 .AND. INTB.LE.137 .OR.
         $       INTB.GE.145 .AND. INTB.LE.153 .OR.
         $       INTB.GE.162 .AND. INTB.LE.169 ) INTB = INTB + 64
    *
          ELSE IF( ZCODE.EQ.218 .OR. ZCODE.EQ.250 ) THEN
    *
    *        ASCII is assumed, on Prime machines - ZCODE is the ASCII code
    *        plus 128 of either lower or upper case 'Z'.
    *
             IF( INTA.GE.225 .AND. INTA.LE.250 ) INTA = INTA - 32
             IF( INTB.GE.225 .AND. INTB.LE.250 ) INTB = INTB - 32
          END IF
          LSAME = INTA.EQ.INTB
    *
    *     RETURN
    *
    *     End of LSAME
    *
          END