lsame()

logical function lsame	(	character	CA,
		character	CB
	)

LSAME

Purpose:

 LSAME returns .TRUE. if CA is the same letter as CB regardless of
 case.

Parameters

[in]	CA	CA is CHARACTER*1
[in]	CB	CB is CHARACTER*1 CA and CB specify the single characters to be compared.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 52 of file lsame.f.

*
*  -- Reference BLAS level1 routine --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*
*     .. Scalar Arguments ..
      CHARACTER CA,CB
*     ..
*
* =====================================================================
*
*     .. Intrinsic Functions ..
      INTRINSIC ichar
*     ..
*     .. Local Scalars ..
      INTEGER INTA,INTB,ZCODE
*     ..
*
*     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
*

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