001: /*
002:  * cblas_ztbsv.c
003:  * The program is a C interface to ztbsv.
004:  *
005:  * Keita Teranishi  3/23/98
006:  *
007:  */
008: #include "cblas.h"
009: #include "cblas_f77.h"
010: void cblas_ztbsv(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_ztbsv","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_ztbsv","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_ztbsv","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_ztbsv( 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_ztbsv","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: 
103:             n = N*2*(tincX);
104: 
105:             x++;
106: 
107:             st=x+n;
108: 
109:             i = tincX << 1;
110:             do
111:             {
112:                *x = -(*x);
113:                x+=i;
114:             }
115:             while (x != st);
116:             x -= n;
117:          }
118:       }
119:       else
120:       {
121:          cblas_xerbla(3, "cblas_ztbsv","Illegal TransA setting, %d\n", TransA);
122:          CBLAS_CallFromC = 0;
123:          RowMajorStrg = 0;
124:          return;
125:       }
126: 
127:       if (Diag == CblasUnit) DI = 'U';
128:       else if (Diag == CblasNonUnit) DI = 'N';
129:       else
130:       {
131:          cblas_xerbla(4, "cblas_ztbsv","Illegal Diag setting, %d\n", Diag);
132:          CBLAS_CallFromC = 0;
133:          RowMajorStrg = 0;
134:          return;
135:       }
136:       #ifdef F77_CHAR
137:          F77_UL = C2F_CHAR(&UL);
138:          F77_TA = C2F_CHAR(&TA);
139:          F77_DI = C2F_CHAR(&DI);
140:       #endif
141: 
142:       F77_ztbsv( F77_UL, F77_TA, F77_DI, &F77_N, &F77_K, A, &F77_lda, X,
143:                       &F77_incX);
144: 
145:       if (TransA == CblasConjTrans)
146:       {
147:          if (N > 0)
148:          {
149:             do
150:             {
151:                *x = -(*x);
152:                x+= i;
153:             }
154:             while (x != st);
155:          }
156:       }
157:    }
158:    else cblas_xerbla(1, "cblas_ztbsv", "Illegal Order setting, %d\n", order);
159:    CBLAS_CallFromC = 0;
160:    RowMajorStrg = 0;
161:    return;
162: }
163: