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86 lines
2.3 KiB
FortranFixed
86 lines
2.3 KiB
FortranFixed
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LOGICAL FUNCTION LSAME(CA,CB)
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*
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* -- LAPACK auxiliary routine (version 3.1) --
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* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
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* November 2006
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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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*
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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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*
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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) 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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