001: /*
002:  * cblas_ztbmv.c
003:  * The program is a C interface to ztbmv.
004:  *
005:  * Keita Teranishi  5/20/98
006:  *
007:  */
008: #include "cblas.h"
009: #include "cblas_f77.h"
010: void cblas_ztbmv(const enum CBLAS_ORDER order, const enum CBLAS_UPLO Uplo,
011:                  const enum CBLAS_TRANSPOSE TransA, const enum CBLAS_DIAG Diag,
012:                  const int N, const int K, const void  *A, const int lda,
013:                  void  *X, const int incX)
014: {
015:    char TA;
016:    char UL;
017:    char DI;
018: #ifdef F77_CHAR
019:    F77_CHAR F77_TA, F77_UL, F77_DI;
020: #else
021:    #define F77_TA &TA
022:    #define F77_UL &UL
023:    #define F77_DI &DI
024: #endif
025: #ifdef F77_INT
026:    F77_INT F77_N=N, F77_lda=lda, F77_K=K, F77_incX=incX;
027: #else
028:    #define F77_N N
029:    #define F77_K K
030:    #define F77_lda lda
031:    #define F77_incX incX
032: #endif
033:    int n, i=0, tincX;
034:    double *st=0, *x=(double *)X;
035:    extern int CBLAS_CallFromC;
036:    extern int RowMajorStrg;
037:    RowMajorStrg = 0;
038: 
039:    CBLAS_CallFromC = 1;
040:    if (order == CblasColMajor)
041:    {
042:       if (Uplo == CblasUpper) UL = 'U';
043:       else if (Uplo == CblasLower) UL = 'L';
044:       else
045:       {
046:          cblas_xerbla(2, "cblas_ztbmv","Illegal Uplo setting, %d\n", Uplo);
047:          CBLAS_CallFromC = 0;
048:          RowMajorStrg = 0;
049:          return;
050:       }
051:       if (TransA == CblasNoTrans) TA = 'N';
052:       else if (TransA == CblasTrans) TA = 'T';
053:       else if (TransA == CblasConjTrans) TA = 'C';
054:       else
055:       {
056:          cblas_xerbla(3, "cblas_ztbmv","Illegal TransA setting, %d\n", TransA);
057:          CBLAS_CallFromC = 0;
058:          RowMajorStrg = 0;
059:          return;
060:       }
061:       if (Diag == CblasUnit) DI = 'U';
062:       else if (Diag == CblasNonUnit) DI = 'N';
063:       else
064:       {
065:          cblas_xerbla(4, "cblas_ztbmv","Illegal Diag setting, %d\n", Diag);
066:          CBLAS_CallFromC = 0;
067:          RowMajorStrg = 0;
068:          return;
069:       }
070:       #ifdef F77_CHAR
071:          F77_UL = C2F_CHAR(&UL);
072:          F77_TA = C2F_CHAR(&TA);
073:          F77_DI = C2F_CHAR(&DI);
074:       #endif
075:       F77_ztbmv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
076:                       &F77_incX);
077:    }
078:    else if (order == CblasRowMajor)
079:    {
080:       RowMajorStrg = 1;
081:       if (Uplo == CblasUpper) UL = 'L';
082:       else if (Uplo == CblasLower) UL = 'U';
083:       else
084:       {
085:          cblas_xerbla(2, "cblas_ztbmv","Illegal Uplo setting, %d\n", Uplo);
086:          CBLAS_CallFromC = 0;
087:          RowMajorStrg = 0;
088:          return;
089:       }
090: 
091:       if (TransA == CblasNoTrans) TA = 'T';
092:       else if (TransA == CblasTrans) TA = 'N';
093:       else if (TransA == CblasConjTrans)
094:       {
095:          TA = 'N';
096:          if ( N > 0)
097:          {
098:             if(incX > 0)
099:                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_ztbmv","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_ztbmv","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_ztbmv( 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_ztbmv", "Illegal Order setting, %d\n", order);
155:    CBLAS_CallFromC = 0;
156:    RowMajorStrg = 0;
157:    return;
158: }
159: