01:       LOGICAL          FUNCTION LSAME( CA, CB )
02: *
03: *  -- LAPACK auxiliary routine (version 3.2) --
04: *     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
05: *     November 2006
06: *
07: *     .. Scalar Arguments ..
08:       CHARACTER          CA, CB
09: *     ..
10: *
11: *  Purpose
12: *  =======
13: *
14: *  LSAME returns .TRUE. if CA is the same letter as CB regardless of
15: *  case.
16: *
17: *  Arguments
18: *  =========
19: *
20: *  CA      (input) CHARACTER*1
21: *  CB      (input) CHARACTER*1
22: *          CA and CB specify the single characters to be compared.
23: *
24: * =====================================================================
25: *
26: *     .. Intrinsic Functions ..
27:       INTRINSIC          ICHAR
28: *     ..
29: *     .. Local Scalars ..
30:       INTEGER            INTA, INTB, ZCODE
31: *     ..
32: *     .. Executable Statements ..
33: *
34: *     Test if the characters are equal
35: *
36:       LSAME = CA.EQ.CB
37:       IF( LSAME )
38:      $   RETURN
39: *
40: *     Now test for equivalence if both characters are alphabetic.
41: *
42:       ZCODE = ICHAR( 'Z' )
43: *
44: *     Use 'Z' rather than 'A' so that ASCII can be detected on Prime
45: *     machines, on which ICHAR returns a value with bit 8 set.
46: *     ICHAR('A') on Prime machines returns 193 which is the same as
47: *     ICHAR('A') on an EBCDIC machine.
48: *
49:       INTA = ICHAR( CA )
50:       INTB = ICHAR( CB )
51: *
52:       IF( ZCODE.EQ.90 .OR. ZCODE.EQ.122 ) THEN
53: *
54: *        ASCII is assumed - ZCODE is the ASCII code of either lower or
55: *        upper case 'Z'.
56: *
57:          IF( INTA.GE.97 .AND. INTA.LE.122 ) INTA = INTA - 32
58:          IF( INTB.GE.97 .AND. INTB.LE.122 ) INTB = INTB - 32
59: *
60:       ELSE IF( ZCODE.EQ.233 .OR. ZCODE.EQ.169 ) THEN
61: *
62: *        EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
63: *        upper case 'Z'.
64: *
65:          IF( INTA.GE.129 .AND. INTA.LE.137 .OR.
66:      $       INTA.GE.145 .AND. INTA.LE.153 .OR.
67:      $       INTA.GE.162 .AND. INTA.LE.169 ) INTA = INTA + 64
68:          IF( INTB.GE.129 .AND. INTB.LE.137 .OR.
69:      $       INTB.GE.145 .AND. INTB.LE.153 .OR.
70:      $       INTB.GE.162 .AND. INTB.LE.169 ) INTB = INTB + 64
71: *
72:       ELSE IF( ZCODE.EQ.218 .OR. ZCODE.EQ.250 ) THEN
73: *
74: *        ASCII is assumed, on Prime machines - ZCODE is the ASCII code
75: *        plus 128 of either lower or upper case 'Z'.
76: *
77:          IF( INTA.GE.225 .AND. INTA.LE.250 ) INTA = INTA - 32
78:          IF( INTB.GE.225 .AND. INTB.LE.250 ) INTB = INTB - 32
79:       END IF
80:       LSAME = INTA.EQ.INTB
81: *
82: *     RETURN
83: *
84: *     End of LSAME
85: *
86:       END
87: