Annotation of rpl/lapack/blas/lsame.f, revision 1.6
1.1 bertrand 1: LOGICAL FUNCTION LSAME(CA,CB)
2: *
3: * -- LAPACK auxiliary routine (version 3.1) --
4: * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
5: * November 2006
6: *
7: * .. Scalar Arguments ..
8: CHARACTER CA,CB
9: * ..
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: *
22: * CB (input) CHARACTER*1
23: * CA and CB specify the single characters to be compared.
24: *
25: * =====================================================================
26: *
27: * .. Intrinsic Functions ..
28: INTRINSIC ICHAR
29: * ..
30: * .. Local Scalars ..
31: INTEGER INTA,INTB,ZCODE
32: * ..
33: *
34: * Test if the characters are equal
35: *
36: LSAME = CA .EQ. CB
37: IF (LSAME) RETURN
38: *
39: * Now test for equivalence if both characters are alphabetic.
40: *
41: ZCODE = ICHAR('Z')
42: *
43: * Use 'Z' rather than 'A' so that ASCII can be detected on Prime
44: * machines, on which ICHAR returns a value with bit 8 set.
45: * ICHAR('A') on Prime machines returns 193 which is the same as
46: * ICHAR('A') on an EBCDIC machine.
47: *
48: INTA = ICHAR(CA)
49: INTB = ICHAR(CB)
50: *
51: IF (ZCODE.EQ.90 .OR. ZCODE.EQ.122) THEN
52: *
53: * ASCII is assumed - ZCODE is the ASCII code of either lower or
54: * upper case 'Z'.
55: *
56: IF (INTA.GE.97 .AND. INTA.LE.122) INTA = INTA - 32
57: IF (INTB.GE.97 .AND. INTB.LE.122) INTB = INTB - 32
58: *
59: ELSE IF (ZCODE.EQ.233 .OR. ZCODE.EQ.169) THEN
60: *
61: * EBCDIC is assumed - ZCODE is the EBCDIC code of either lower or
62: * upper case 'Z'.
63: *
64: IF (INTA.GE.129 .AND. INTA.LE.137 .OR.
65: + INTA.GE.145 .AND. INTA.LE.153 .OR.
66: + INTA.GE.162 .AND. INTA.LE.169) INTA = INTA + 64
67: IF (INTB.GE.129 .AND. INTB.LE.137 .OR.
68: + INTB.GE.145 .AND. INTB.LE.153 .OR.
69: + INTB.GE.162 .AND. INTB.LE.169) INTB = INTB + 64
70: *
71: ELSE IF (ZCODE.EQ.218 .OR. ZCODE.EQ.250) THEN
72: *
73: * ASCII is assumed, on Prime machines - ZCODE is the ASCII code
74: * plus 128 of either lower or upper case 'Z'.
75: *
76: IF (INTA.GE.225 .AND. INTA.LE.250) INTA = INTA - 32
77: IF (INTB.GE.225 .AND. INTB.LE.250) INTB = INTB - 32
78: END IF
79: LSAME = INTA .EQ. INTB
80: *
81: * RETURN
82: *
83: * End of LSAME
84: *
85: END
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