001: /*
002:  * cblas_ctrsv.c
003:  * The program is a C interface to ctrsv.
004:  *
005:  * Keita Teranishi  3/23/98
006:  *
007:  */
008: #include "cblas.h"
009: #include "cblas_f77.h"
010: void cblas_ctrsv(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 void  *A, const int lda, void  *X,
013:                  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_incX=incX;
027: #else
028:    #define F77_N N
029:    #define F77_lda lda
030:    #define F77_incX incX
031: #endif
032:    int n, i=0, tincX;
033:    float *st=0,*x=(float *)X;
034:    extern int CBLAS_CallFromC;
035:    extern int RowMajorStrg;
036:    RowMajorStrg = 0;
037: 
038:    CBLAS_CallFromC = 1;
039:    if (order == CblasColMajor)
040:    {
041:       if (Uplo == CblasUpper) UL = 'U';
042:       else if (Uplo == CblasLower) UL = 'L';
043:       else
044:       {
045:          cblas_xerbla(2, "cblas_ctrsv","Illegal Uplo setting, %d\n", Uplo);
046:          CBLAS_CallFromC = 0;
047:          RowMajorStrg = 0;
048:          return;
049:       }
050:       if (TransA == CblasNoTrans) TA = 'N';
051:       else if (TransA == CblasTrans) TA = 'T';
052:       else if (TransA == CblasConjTrans) TA = 'C';
053:       else
054:       {
055:          cblas_xerbla(3, "cblas_ctrsv","Illegal TransA setting, %d\n", TransA);
056:          CBLAS_CallFromC = 0;
057:          RowMajorStrg = 0;
058:          return;
059:       }
060:       if (Diag == CblasUnit) DI = 'U';
061:       else if (Diag == CblasNonUnit) DI = 'N';
062:       else
063:       {
064:          cblas_xerbla(4, "cblas_ctrsv","Illegal Diag setting, %d\n", Diag);
065:          CBLAS_CallFromC = 0;
066:          RowMajorStrg = 0;
067:          return;
068:       }
069:       #ifdef F77_CHAR
070:          F77_UL = C2F_CHAR(&UL);
071:          F77_TA = C2F_CHAR(&TA);
072:          F77_DI = C2F_CHAR(&DI);
073:       #endif
074:       F77_ctrsv( F77_UL, F77_TA, F77_DI, &F77_N, A, &F77_lda, X,
075:                       &F77_incX);
076:    }
077:    else if (order == CblasRowMajor)
078:    {
079:       RowMajorStrg = 1;
080:       if (Uplo == CblasUpper) UL = 'L';
081:       else if (Uplo == CblasLower) UL = 'U';
082:       else
083:       {
084:          cblas_xerbla(2, "cblas_ctrsv","Illegal Uplo setting, %d\n", Uplo);
085:          CBLAS_CallFromC = 0;
086:          RowMajorStrg = 0;
087:          return;
088:       }
089: 
090:       if (TransA == CblasNoTrans) TA = 'T';
091:       else if (TransA == CblasTrans) TA = 'N';
092:       else if (TransA == CblasConjTrans)
093:       {
094:          TA = 'N';
095:          if ( N > 0)
096:          {
097:             if ( incX > 0 )
098:                tincX = incX;
099:             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: