1/*
2 * cblas_ctbmv.c
3 * The program is a C interface to ctbmv.
4 *
5 * Keita Teranishi  5/20/98
6 *
7 */
8#include "cblas.h"
9#include "cblas_f77.h"
10void cblas_ctbmv(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 int K, const void  *A, const int lda,
13                 void  *X, 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_K=K, F77_incX=incX;
27#else
28   #define F77_N N
29   #define F77_K K
30   #define F77_lda lda
31   #define F77_incX incX
32#endif
33   int n, i=0, tincX;
34   float *st=0, *x=(float *)X;
35   extern int CBLAS_CallFromC;
36   extern int RowMajorStrg;
37   RowMajorStrg = 0;
38
39   CBLAS_CallFromC = 1;
40   if (order == CblasColMajor)
41   {
42      if (Uplo == CblasUpper) UL = 'U';
43      else if (Uplo == CblasLower) UL = 'L';
44      else
45      {
46         cblas_xerbla(2, "cblas_ctbmv","Illegal Uplo setting, %d\n", Uplo);
47         CBLAS_CallFromC = 0;
48         RowMajorStrg = 0;
49         return;
50      }
51      if (TransA == CblasNoTrans) TA = 'N';
52      else if (TransA == CblasTrans) TA = 'T';
53      else if (TransA == CblasConjTrans) TA = 'C';
54      else
55      {
56         cblas_xerbla(3, "cblas_ctbmv","Illegal TransA setting, %d\n", TransA);
57         CBLAS_CallFromC = 0;
58         RowMajorStrg = 0;
59         return;
60      }
61      if (Diag == CblasUnit) DI = 'U';
62      else if (Diag == CblasNonUnit) DI = 'N';
63      else
64      {
65         cblas_xerbla(4, "cblas_ctbmv","Illegal Diag setting, %d\n", Diag);
66         CBLAS_CallFromC = 0;
67         RowMajorStrg = 0;
68         return;
69      }
70      #ifdef F77_CHAR
71         F77_UL = C2F_CHAR(&UL);
72         F77_TA = C2F_CHAR(&TA);
73         F77_DI = C2F_CHAR(&DI);
74      #endif
75      F77_ctbmv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
76                      &F77_incX);
77   }
78   else if (order == CblasRowMajor)
79   {
80      RowMajorStrg = 1;
81      if (Uplo == CblasUpper) UL = 'L';
82      else if (Uplo == CblasLower) UL = 'U';
83      else
84      {
85         cblas_xerbla(2, "cblas_ctbmv","Illegal Uplo setting, %d\n", Uplo);
86         CBLAS_CallFromC = 0;
87         RowMajorStrg = 0;
88         return;
89      }
90
91      if (TransA == CblasNoTrans) TA = 'T';
92      else if (TransA == CblasTrans) TA = 'N';
93      else if (TransA == CblasConjTrans)
94      {
95         TA = 'N';
96         if ( N > 0)
97         {
98            if(incX > 0)
99               tincX = incX;
100            else
101               tincX = -incX;
102            i = tincX << 1;
103            n = i * N;
104            x++;
105            st = x + n;
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_ctbmv","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_ctbmv","Illegal Uplo setting, %d\n", Uplo);
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
138      F77_ctbmv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
139                      &F77_incX);
140
141      if (TransA == CblasConjTrans)
142      {
143         if (N > 0)
144         {
145            do
146            {
147               *x = -(*x);
148               x += i;
149            }
150            while (x != st);
151         }
152      }
153   }
154   else cblas_xerbla(1, "cblas_ctbmv", "Illegal Order setting, %d\n", order);
155   CBLAS_CallFromC = 0;
156   RowMajorStrg = 0;
157   return;
158}
159