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    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