1 /*
2  * cblas_ctrsv.c
3  * The program is a C interface to ctrsv.
4  *
5  * Keita Teranishi  3/23/98
6  *
7  */
8 #include "cblas.h"
9 #include "cblas_f77.h"
cblas_ctrsv(const enum CBLAS_ORDER order,const enum CBLAS_UPLO Uplo,const enum CBLAS_TRANSPOSE TransA,const enum CBLAS_DIAG Diag,const int N,const void * A,const int lda,void * X,const int incX)10 void cblas_ctrsv(const enum CBLAS_ORDER order, const enum CBLAS_UPLO Uplo,
11                  const enum CBLAS_TRANSPOSE TransA, const enum CBLAS_DIAG Diag,
12                  const int N, const void  *A, const int lda, void  *X,
13                  const int incX)
14 {
15    char TA;
16    char UL;
17    char DI;
18 #ifdef F77_CHAR
19    F77_CHAR F77_TA, F77_UL, F77_DI;
20 #else
21    #define F77_TA &TA
22    #define F77_UL &UL
23    #define F77_DI &DI
24 #endif
25 #ifdef F77_INT
26    F77_INT F77_N=N, F77_lda=lda, F77_incX=incX;
27 #else
28    #define F77_N N
29    #define F77_lda lda
30    #define F77_incX incX
31 #endif
32    int n, i=0, tincX;
33    float *st=0,*x=(float *)X;
34    extern int CBLAS_CallFromC;
35    extern int RowMajorStrg;
36    RowMajorStrg = 0;
37 
38    CBLAS_CallFromC = 1;
39    if (order == CblasColMajor)
40    {
41       if (Uplo == CblasUpper) UL = 'U';
42       else if (Uplo == CblasLower) UL = 'L';
43       else
44       {
45          cblas_xerbla(2, "cblas_ctrsv","Illegal Uplo setting, %d\n", Uplo);
46          CBLAS_CallFromC = 0;
47          RowMajorStrg = 0;
48          return;
49       }
50       if (TransA == CblasNoTrans) TA = 'N';
51       else if (TransA == CblasTrans) TA = 'T';
52       else if (TransA == CblasConjTrans) TA = 'C';
53       else
54       {
55          cblas_xerbla(3, "cblas_ctrsv","Illegal TransA setting, %d\n", TransA);
56          CBLAS_CallFromC = 0;
57          RowMajorStrg = 0;
58          return;
59       }
60       if (Diag == CblasUnit) DI = 'U';
61       else if (Diag == CblasNonUnit) DI = 'N';
62       else
63       {
64          cblas_xerbla(4, "cblas_ctrsv","Illegal Diag setting, %d\n", Diag);
65          CBLAS_CallFromC = 0;
66          RowMajorStrg = 0;
67          return;
68       }
69       #ifdef F77_CHAR
70          F77_UL = C2F_CHAR(&UL);
71          F77_TA = C2F_CHAR(&TA);
72          F77_DI = C2F_CHAR(&DI);
73       #endif
74       F77_ctrsv( F77_UL, F77_TA, F77_DI, &F77_N, A, &F77_lda, X,
75                       &F77_incX);
76    }
77    else if (order == CblasRowMajor)
78    {
79       RowMajorStrg = 1;
80       if (Uplo == CblasUpper) UL = 'L';
81       else if (Uplo == CblasLower) UL = 'U';
82       else
83       {
84          cblas_xerbla(2, "cblas_ctrsv","Illegal Uplo setting, %d\n", Uplo);
85          CBLAS_CallFromC = 0;
86          RowMajorStrg = 0;
87          return;
88       }
89 
90       if (TransA == CblasNoTrans) TA = 'T';
91       else if (TransA == CblasTrans) TA = 'N';
92       else if (TransA == CblasConjTrans)
93       {
94          TA = 'N';
95          if ( N > 0)
96          {
97             if ( incX > 0 )
98                tincX = incX;
99             else
100                tincX = -incX;
101 
102             n = N*2*(tincX);
103             x++;
104             st=x+n;
105             i = tincX << 1;
106             do
107             {
108                *x = -(*x);
109                x+=i;
110             }
111             while (x != st);
112             x -= n;
113          }
114       }
115       else
116       {
117          cblas_xerbla(3, "cblas_ctrsv","Illegal TransA setting, %d\n", TransA);
118          CBLAS_CallFromC = 0;
119          RowMajorStrg = 0;
120          return;
121       }
122 
123       if (Diag == CblasUnit) DI = 'U';
124       else if (Diag == CblasNonUnit) DI = 'N';
125       else
126       {
127          cblas_xerbla(4, "cblas_ctrsv","Illegal Diag setting, %d\n", Diag);
128          CBLAS_CallFromC = 0;
129          RowMajorStrg = 0;
130          return;
131       }
132       #ifdef F77_CHAR
133          F77_UL = C2F_CHAR(&UL);
134          F77_TA = C2F_CHAR(&TA);
135          F77_DI = C2F_CHAR(&DI);
136       #endif
137       F77_ctrsv( F77_UL, F77_TA, F77_DI, &F77_N, A, &F77_lda, X,
138                       &F77_incX);
139       if (TransA == CblasConjTrans)
140       {
141          if (N > 0)
142          {
143             do
144             {
145                *x = -(*x);
146                x += i;
147             }
148             while (x != st);
149          }
150       }
151    }
152    else cblas_xerbla(1, "cblas_ctrsv", "Illegal Order setting, %d\n", order);
153    CBLAS_CallFromC = 0;
154    RowMajorStrg = 0;
155    return;
156 }
157