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lsame.f
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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 *> \endverbatim
33 *>
34 *> \param[in] CB
35 *> \verbatim
36 *> CA and CB specify the single characters to be compared.
37 *> \endverbatim
38 *
39 * Authors:
40 * ========
41 *
42 *> \author Univ. of Tennessee
43 *> \author Univ. of California Berkeley
44 *> \author Univ. of Colorado Denver
45 *> \author NAG Ltd.
46 *
47 *> \date November 2011
48 *
49 *> \ingroup auxOTHERauxiliary
50 *
51 * =====================================================================
52  LOGICAL FUNCTION lsame( CA, CB )
53 *
54 * -- LAPACK auxiliary routine (version 3.4.0) --
55 * -- LAPACK is a software package provided by Univ. of Tennessee, --
56 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
57 * November 2011
58 *
59 * .. Scalar Arguments ..
60  CHARACTER ca, cb
61 * ..
62 *
63 * =====================================================================
64 *
65 * .. Intrinsic Functions ..
66  INTRINSIC ichar
67 * ..
68 * .. Local Scalars ..
69  INTEGER inta, intb, zcode
70 * ..
71 * .. Executable Statements ..
72 *
73 * Test if the characters are equal
74 *
75  lsame = ca.EQ.cb
76  IF( lsame )
77  $ 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