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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 |