LAPACK 3.3.1
Linear Algebra PACKage

BLAS/SRC/xerbla_array.f

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00001       SUBROUTINE XERBLA_ARRAY(SRNAME_ARRAY, SRNAME_LEN, INFO)
00002 *
00003 *  -- LAPACK auxiliary routine (version 3.0) --
00004 *     Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
00005 *     September 19, 2006
00006 *
00007       IMPLICIT NONE
00008 *     .. Scalar Arguments ..
00009       INTEGER SRNAME_LEN, INFO
00010 *     ..
00011 *     .. Array Arguments ..
00012       CHARACTER(1) SRNAME_ARRAY(SRNAME_LEN)
00013 *     ..
00014 *
00015 *  Purpose
00016 *  =======
00017 *
00018 *  XERBLA_ARRAY assists other languages in calling XERBLA, the LAPACK
00019 *  and BLAS error handler.  Rather than taking a Fortran string argument
00020 *  as the function's name, XERBLA_ARRAY takes an array of single
00021 *  characters along with the array's length.  XERBLA_ARRAY then copies
00022 *  up to 32 characters of that array into a Fortran string and passes
00023 *  that to XERBLA.  If called with a non-positive SRNAME_LEN,
00024 *  XERBLA_ARRAY will call XERBLA with a string of all blank characters.
00025 *
00026 *  Say some macro or other device makes XERBLA_ARRAY available to C99
00027 *  by a name lapack_xerbla and with a common Fortran calling convention.
00028 *  Then a C99 program could invoke XERBLA via:
00029 *     {
00030 *       int flen = strlen(__func__);
00031 *       lapack_xerbla(__func__, &flen, &info);
00032 *     }
00033 *
00034 *  Providing XERBLA_ARRAY is not necessary for intercepting LAPACK
00035 *  errors.  XERBLA_ARRAY calls XERBLA.
00036 *
00037 *  Arguments
00038 *  =========
00039 *
00040 *  SRNAME_ARRAY (input) CHARACTER(1) array, dimension (SRNAME_LEN)
00041 *          The name of the routine which called XERBLA_ARRAY.
00042 *
00043 *  SRNAME_LEN (input) INTEGER
00044 *          The length of the name in SRNAME_ARRAY.
00045 *
00046 *  INFO    (input) INTEGER
00047 *          The position of the invalid parameter in the parameter list
00048 *          of the calling routine.
00049 *
00050 * =====================================================================
00051 *
00052 *     ..
00053 *     .. Local Scalars ..
00054       INTEGER I
00055 *     ..
00056 *     .. Local Arrays ..
00057       CHARACTER*32 SRNAME
00058 *     ..
00059 *     .. Intrinsic Functions ..
00060       INTRINSIC MIN, LEN
00061 *     ..
00062 *     .. External Functions ..
00063       EXTERNAL XERBLA
00064 *     ..
00065 *     .. Executable Statements ..
00066       SRNAME = ''
00067       DO I = 1, MIN( SRNAME_LEN, LEN( SRNAME ) )
00068          SRNAME( I:I ) = SRNAME_ARRAY( I )
00069       END DO
00070 
00071       CALL XERBLA( SRNAME, INFO )
00072 
00073       RETURN
00074       END
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