| 1 | LOGICAL FUNCTION LSAME(CA,CB)
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| 2 | *
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| 3 | * -- LAPACK auxiliary routine (version 3.1) --
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| 4 | * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
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| 5 | * November 2006
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| 6 | *
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| 7 | * .. Scalar Arguments ..
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| 8 | CHARACTER CA,CB
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| 9 | * ..
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| 10 | *
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| 11 | * Purpose
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| 12 | * =======
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| 13 | *
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| 14 | * LSAME returns .TRUE. if CA is the same letter as CB regardless of
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| 15 | * case.
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| 16 | *
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| 17 | * Arguments
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| 18 | * =========
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| 19 | *
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| 20 | * CA (input) CHARACTER*1
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| 21 | *
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| 22 | * CB (input) CHARACTER*1
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| 23 | * CA and CB specify the single characters to be compared.
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| 24 | *
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| 25 | * =====================================================================
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| 26 | *
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| 27 | * .. Intrinsic Functions ..
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| 28 | INTRINSIC ICHAR
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| 29 | * ..
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| 30 | * .. Local Scalars ..
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| 31 | INTEGER INTA,INTB,ZCODE
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| 32 | * ..
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| 33 | *
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| 34 | * Test if the characters are equal
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| 35 | *
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| 36 | LSAME = CA .EQ. CB
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| 37 | IF (LSAME) RETURN
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| 38 | *
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| 39 | * Now test for equivalence if both characters are alphabetic.
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| 40 | *
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| 41 | ZCODE = ICHAR('Z')
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| 42 | *
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| 43 | * Use 'Z' rather than 'A' so that ASCII can be detected on Prime
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| 44 | * machines, on which ICHAR returns a value with bit 8 set.
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| 45 | * ICHAR('A') on Prime machines returns 193 which is the same as
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| 46 | * ICHAR('A') on an EBCDIC machine.
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| 47 | *
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| 48 | INTA = ICHAR(CA)
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| 49 | INTB = ICHAR(CB)
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| 50 | *
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| 51 | IF (ZCODE.EQ.90 .OR. ZCODE.EQ.122) THEN
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| 52 | *
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| 53 | * ASCII is assumed - ZCODE is the ASCII code of either lower or
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| 54 | * upper case 'Z'.
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| 55 | *
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| 56 | IF (INTA.GE.97 .AND. INTA.LE.122) INTA = INTA - 32
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| 57 | IF (INTB.GE.97 .AND. INTB.LE.122) INTB = INTB - 32
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| 58 | *
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| 59 | ELSE IF (ZCODE.EQ.233 .OR. ZCODE.EQ.169) THEN
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| 60 | *
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| 61 | * EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
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| 62 | * upper case 'Z'.
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| 63 | *
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| 64 | IF (INTA.GE.129 .AND. INTA.LE.137 .OR.
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| 65 | + INTA.GE.145 .AND. INTA.LE.153 .OR.
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| 66 | + INTA.GE.162 .AND. INTA.LE.169) INTA = INTA + 64
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| 67 | IF (INTB.GE.129 .AND. INTB.LE.137 .OR.
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| 68 | + INTB.GE.145 .AND. INTB.LE.153 .OR.
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| 69 | + INTB.GE.162 .AND. INTB.LE.169) INTB = INTB + 64
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| 70 | *
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| 71 | ELSE IF (ZCODE.EQ.218 .OR. ZCODE.EQ.250) THEN
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| 72 | *
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| 73 | * ASCII is assumed, on Prime machines - ZCODE is the ASCII code
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| 74 | * plus 128 of either lower or upper case 'Z'.
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| 75 | *
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| 76 | IF (INTA.GE.225 .AND. INTA.LE.250) INTA = INTA - 32
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| 77 | IF (INTB.GE.225 .AND. INTB.LE.250) INTB = INTB - 32
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| 78 | END IF
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| 79 | LSAME = INTA .EQ. INTB
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| 80 | *
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| 81 | * RETURN
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| 82 | *
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| 83 | * End of LSAME
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| 84 | *
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| 85 | END
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