# dlib C++ Library - cblas_dtrsv.c

    /*
     * cblas_dtrsv.c
     * The program is a C interface to dtrsv.
     *
     * Keita Teranishi  5/20/98
     *
     */
    #include "cblas.h"
    #include "cblas_f77.h"
    void cblas_dtrsv(const enum CBLAS_ORDER order, const enum CBLAS_UPLO Uplo,
                     const enum CBLAS_TRANSPOSE TransA, const enum CBLAS_DIAG Diag,
                     const CBLAS_INT_TYPE N, const double  *A, const CBLAS_INT_TYPE lda, double  *X,
                     const CBLAS_INT_TYPE incX)

    {
       char TA;
       char UL;
       char DI;
    #ifdef F77_CHAR
       F77_CHAR F77_TA, F77_UL, F77_DI;
    #else
       #define F77_TA &TA
       #define F77_UL &UL
       #define F77_DI &DI
    #endif
    #ifdef F77_INT
       F77_INT F77_N=N, F77_lda=lda, F77_incX=incX;
    #else
       #define F77_N N
       #define F77_lda lda
       #define F77_incX incX
    #endif

       if (order == CblasColMajor)
       {
          if (Uplo == CblasUpper) UL = 'U';
          else if (Uplo == CblasLower) UL = 'L';
          else
          {
             cblas_xerbla(2, "cblas_dtrsv","Illegal Uplo setting, %d\n", Uplo);
             return;
          }
          if (TransA == CblasNoTrans) TA = 'N';
          else if (TransA == CblasTrans) TA = 'T';
          else if (TransA == CblasConjTrans) TA = 'C';
          else
          {
             cblas_xerbla(3, "cblas_dtrsv","Illegal TransA setting, %d\n", TransA);
             return;
          }
          if (Diag == CblasUnit) DI = 'U';
          else if (Diag == CblasNonUnit) DI = 'N';
          else
          {
             cblas_xerbla(4, "cblas_dtrsv","Illegal Diag setting, %d\n", Diag);
             return;
          }
          #ifdef F77_CHAR
             F77_UL = C2F_CHAR(&UL);
             F77_TA = C2F_CHAR(&TA);
             F77_DI = C2F_CHAR(&DI);
          #endif
          F77_dtrsv( F77_UL, F77_TA, F77_DI, &F77_N, A, &F77_lda, X,
                          &F77_incX);
       }
       else if (order == CblasRowMajor)
       {
          if (Uplo == CblasUpper) UL = 'L';
          else if (Uplo == CblasLower) UL = 'U';
          else
          {
             cblas_xerbla(2, "cblas_dtrsv","Illegal Uplo setting, %d\n", Uplo);
             return;
          }

          if (TransA == CblasNoTrans) TA = 'T';
          else if (TransA == CblasTrans) TA = 'N';
          else if (TransA == CblasConjTrans) TA = 'N';
          else
          {
             cblas_xerbla(3, "cblas_dtrsv","Illegal TransA setting, %d\n", TransA);
             return;
          }

          if (Diag == CblasUnit) DI = 'U';
          else if (Diag == CblasNonUnit) DI = 'N';
          else
          {
             cblas_xerbla(4, "cblas_dtrsv","Illegal Diag setting, %d\n", Diag);
             return;
          }
          #ifdef F77_CHAR
             F77_UL = C2F_CHAR(&UL);
             F77_TA = C2F_CHAR(&TA);
             F77_DI = C2F_CHAR(&DI);
          #endif
          F77_dtrsv( F77_UL, F77_TA, F77_DI, &F77_N, A, &F77_lda, X,
                          &F77_incX);
       }
       else cblas_xerbla(1, "cblas_dtrsv", "Illegal Order setting, %d\n", order);
       return;
    }