root / src / lapack / util / lsame.f @ 11
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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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* 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 |