87 lines
2.4 KiB
Fortran
87 lines
2.4 KiB
Fortran
LOGICAL FUNCTION LSAME( CA, CB )
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*
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* -- LAPACK auxiliary routine (version 2.0) --
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* Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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* Courant Institute, Argonne National Lab, and Rice University
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* January 31, 1994
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*
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* .. Scalar Arguments ..
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CHARACTER CA, CB
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* ..
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*
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* Purpose
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* =======
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*
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* LSAME returns .TRUE. if CA is the same letter as CB regardless of
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* case.
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*
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* Arguments
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* =========
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*
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* CA (input) CHARACTER*1
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* CB (input) CHARACTER*1
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* CA and CB specify the single characters to be compared.
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*
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* =====================================================================
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*
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* .. Intrinsic Functions ..
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INTRINSIC ICHAR
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* ..
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* .. Local Scalars ..
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INTEGER INTA, INTB, ZCODE
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* ..
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* .. Executable Statements ..
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*
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* Test if the characters are equal
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*
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LSAME = CA.EQ.CB
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IF( LSAME )
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$ RETURN
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*
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* Now test for equivalence if both characters are alphabetic.
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*
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ZCODE = ICHAR( 'Z' )
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*
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* Use 'Z' rather than 'A' so that ASCII can be detected on Prime
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* machines, on which ICHAR returns a value with bit 8 set.
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* ICHAR('A') on Prime machines returns 193 which is the same as
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* ICHAR('A') on an EBCDIC machine.
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*
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INTA = ICHAR( CA )
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INTB = ICHAR( CB )
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*
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IF( ZCODE.EQ.90 .OR. ZCODE.EQ.122 ) THEN
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*
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* ASCII is assumed - ZCODE is the ASCII code of either lower or
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* upper case 'Z'.
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*
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IF( INTA.GE.97 .AND. INTA.LE.122 ) INTA = INTA - 32
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IF( INTB.GE.97 .AND. INTB.LE.122 ) INTB = INTB - 32
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*
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ELSE IF( ZCODE.EQ.233 .OR. ZCODE.EQ.169 ) THEN
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*
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* EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
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* upper case 'Z'.
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*
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IF( INTA.GE.129 .AND. INTA.LE.137 .OR.
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$ INTA.GE.145 .AND. INTA.LE.153 .OR.
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$ INTA.GE.162 .AND. INTA.LE.169 ) INTA = INTA + 64
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IF( INTB.GE.129 .AND. INTB.LE.137 .OR.
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$ INTB.GE.145 .AND. INTB.LE.153 .OR.
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$ INTB.GE.162 .AND. INTB.LE.169 ) INTB = INTB + 64
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*
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ELSE IF( ZCODE.EQ.218 .OR. ZCODE.EQ.250 ) THEN
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*
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* ASCII is assumed, on Prime machines - ZCODE is the ASCII code
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* plus 128 of either lower or upper case 'Z'.
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*
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IF( INTA.GE.225 .AND. INTA.LE.250 ) INTA = INTA - 32
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IF( INTB.GE.225 .AND. INTB.LE.250 ) INTB = INTB - 32
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END IF
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LSAME = INTA.EQ.INTB
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*
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* RETURN
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*
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* End of LSAME
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*
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END
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