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"
10void 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