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: *> \ingroup aux_blas
50: *
51: * =====================================================================
52: LOGICAL FUNCTION LSAME(CA,CB)
53: *
54: * -- Reference BLAS level1 routine --
55: * -- Reference BLAS is a software package provided by Univ. of Tennessee, --
56: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
57: *
58: * .. Scalar Arguments ..
59: CHARACTER CA,CB
60: * ..
61: *
62: * =====================================================================
63: *
64: * .. Intrinsic Functions ..
65: INTRINSIC ICHAR
66: * ..
67: * .. Local Scalars ..
68: INTEGER INTA,INTB,ZCODE
69: * ..
70: *
71: * Test if the characters are equal
72: *
73: LSAME = CA .EQ. CB
74: IF (LSAME) RETURN
75: *
76: * Now test for equivalence if both characters are alphabetic.
77: *
78: ZCODE = ICHAR('Z')
79: *
80: * Use 'Z' rather than 'A' so that ASCII can be detected on Prime
81: * machines, on which ICHAR returns a value with bit 8 set.
82: * ICHAR('A') on Prime machines returns 193 which is the same as
83: * ICHAR('A') on an EBCDIC machine.
84: *
85: INTA = ICHAR(CA)
86: INTB = ICHAR(CB)
87: *
88: IF (ZCODE.EQ.90 .OR. ZCODE.EQ.122) THEN
89: *
90: * ASCII is assumed - ZCODE is the ASCII code of either lower or
91: * upper case 'Z'.
92: *
93: IF (INTA.GE.97 .AND. INTA.LE.122) INTA = INTA - 32
94: IF (INTB.GE.97 .AND. INTB.LE.122) INTB = INTB - 32
95: *
96: ELSE IF (ZCODE.EQ.233 .OR. ZCODE.EQ.169) THEN
97: *
98: * EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
99: * upper case 'Z'.
100: *
101: IF (INTA.GE.129 .AND. INTA.LE.137 .OR.
102: + INTA.GE.145 .AND. INTA.LE.153 .OR.
103: + INTA.GE.162 .AND. INTA.LE.169) INTA = INTA + 64
104: IF (INTB.GE.129 .AND. INTB.LE.137 .OR.
105: + INTB.GE.145 .AND. INTB.LE.153 .OR.
106: + INTB.GE.162 .AND. INTB.LE.169) INTB = INTB + 64
107: *
108: ELSE IF (ZCODE.EQ.218 .OR. ZCODE.EQ.250) THEN
109: *
110: * ASCII is assumed, on Prime machines - ZCODE is the ASCII code
111: * plus 128 of either lower or upper case 'Z'.
112: *
113: IF (INTA.GE.225 .AND. INTA.LE.250) INTA = INTA - 32
114: IF (INTB.GE.225 .AND. INTB.LE.250) INTB = INTB - 32
115: END IF
116: LSAME = INTA .EQ. INTB
117: *
118: * RETURN
119: *
120: * End of LSAME
121: *
122: END
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