LAPACK  3.8.0
LAPACK: Linear Algebra PACKage
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 *> 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
logical function lsame(CA, CB)
LSAME
Definition: lsame.f:55