1*> \brief \b LSAME
2*
3*  =========== DOCUMENTATION ===========
4*
5* Online html documentation available at
6*            http://www.netlib.org/lapack/explore-html/
7*
8*  Definition:
9*  ===========
10*
11*       LOGICAL FUNCTION LSAME(CA,CB)
12*
13*       .. Scalar Arguments ..
14*       CHARACTER CA,CB
15*       ..
16*
17*
18*> \par Purpose:
19*  =============
20*>
21*> \verbatim
22*>
23*> LSAME returns .TRUE. if CA is the same letter as CB regardless of
24*> case.
25*> \endverbatim
26*
27*  Arguments:
28*  ==========
29*
30*> \param[in] CA
31*> \verbatim
32*>          CA is CHARACTER*1
33*> \endverbatim
34*>
35*> \param[in] CB
36*> \verbatim
37*>          CB is CHARACTER*1
38*>          CA and CB specify the single characters to be compared.
39*> \endverbatim
40*
41*  Authors:
42*  ========
43*
44*> \author Univ. of Tennessee
45*> \author Univ. of California Berkeley
46*> \author Univ. of Colorado Denver
47*> \author NAG Ltd.
48*
49*> \date December 2016
50*
51*> \ingroup aux_blas
52*
53*  =====================================================================
54      LOGICAL FUNCTION LSAME(CA,CB)
55*
56*  -- Reference BLAS level1 routine (version 3.1) --
57*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
58*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
59*     December 2016
60*
61*     .. Scalar Arguments ..
62      CHARACTER CA,CB
63*     ..
64*
65* =====================================================================
66*
67*     .. Intrinsic Functions ..
68      INTRINSIC ICHAR
69*     ..
70*     .. Local Scalars ..
71      INTEGER INTA,INTB,ZCODE
72*     ..
73*
74*     Test if the characters are equal
75*
76      LSAME = CA .EQ. CB
77      IF (LSAME) RETURN
78*
79*     Now test for equivalence if both characters are alphabetic.
80*
81      ZCODE = ICHAR('Z')
82*
83*     Use 'Z' rather than 'A' so that ASCII can be detected on Prime
84*     machines, on which ICHAR returns a value with bit 8 set.
85*     ICHAR('A') on Prime machines returns 193 which is the same as
86*     ICHAR('A') on an EBCDIC machine.
87*
88      INTA = ICHAR(CA)
89      INTB = ICHAR(CB)
90*
91      IF (ZCODE.EQ.90 .OR. ZCODE.EQ.122) THEN
92*
93*        ASCII is assumed - ZCODE is the ASCII code of either lower or
94*        upper case 'Z'.
95*
96          IF (INTA.GE.97 .AND. INTA.LE.122) INTA = INTA - 32
97          IF (INTB.GE.97 .AND. INTB.LE.122) INTB = INTB - 32
98*
99      ELSE IF (ZCODE.EQ.233 .OR. ZCODE.EQ.169) THEN
100*
101*        EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
102*        upper case 'Z'.
103*
104          IF (INTA.GE.129 .AND. INTA.LE.137 .OR.
105     +        INTA.GE.145 .AND. INTA.LE.153 .OR.
106     +        INTA.GE.162 .AND. INTA.LE.169) INTA = INTA + 64
107          IF (INTB.GE.129 .AND. INTB.LE.137 .OR.
108     +        INTB.GE.145 .AND. INTB.LE.153 .OR.
109     +        INTB.GE.162 .AND. INTB.LE.169) INTB = INTB + 64
110*
111      ELSE IF (ZCODE.EQ.218 .OR. ZCODE.EQ.250) THEN
112*
113*        ASCII is assumed, on Prime machines - ZCODE is the ASCII code
114*        plus 128 of either lower or upper case 'Z'.
115*
116          IF (INTA.GE.225 .AND. INTA.LE.250) INTA = INTA - 32
117          IF (INTB.GE.225 .AND. INTB.LE.250) INTB = INTB - 32
118      END IF
119      LSAME = INTA .EQ. INTB
120*
121*     RETURN
122*
123*     End of LSAME
124*
125      END
126