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weitere Absicherung multiply

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maxgrf 2025-11-18 13:18:29 +01:00
parent 75dc5fc631
commit 89262e4763
1 changed files with 7 additions and 5 deletions
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12
matrix.c
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@ -32,7 +32,7 @@ void clearMatrix(Matrix *matrix)
} }
} }
void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx) void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx) //Problematisch Call-by-Value --> Call-by-Pointer
// Matrix matrix zu Matrix *matrix, empfehlung // Matrix matrix zu Matrix *matrix, empfehlung
{ {
if (rowIdx < matrix.rows && colIdx < matrix.cols && matrix.buffer != NULL) if (rowIdx < matrix.rows && colIdx < matrix.cols && matrix.buffer != NULL)
@ -102,11 +102,13 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
{ {
// Needed: rows/Zeilen, collums/Spalten // Needed: rows/Zeilen, collums/Spalten
MatrixType buffer_add; MatrixType buffer_add;
// Probe ob Spalten1 = Zeilen2
if (matrix1.cols != matrix2.rows) if (!matrix1.buffer || !matrix2.buffer) // Probe ob leere Matrize vorliegt
return createMatrix(0, 0);
if (matrix1.cols != matrix2.rows) // Probe ob Spalten1 = Zeilen2
return createMatrix(0, 0); return createMatrix(0, 0);
Matrix result_mul = createMatrix(matrix1.rows, matrix2.cols); // "" Matrix result_mul = createMatrix(matrix1.rows, matrix2.cols);
for (unsigned int index = 0; index < matrix1.rows; index++) for (unsigned int index = 0; index < matrix1.rows; index++)
{ {
@ -119,7 +121,7 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
buffer_add += getMatrixAt(matrix1, index, skalar) * getMatrixAt(matrix2, skalar, shift); buffer_add += getMatrixAt(matrix1, index, skalar) * getMatrixAt(matrix2, skalar, shift);
} }
// matrix_mul[index][shift] = buffer_add; // matrix_mul[index][shift] = buffer_add;
setMatrixAt(buffer_add, result_mul, index, shift); // result als Pointer, also mit &result setMatrixAt(buffer_add, result_mul, index, shift);
} }
} }
return result_mul; return result_mul;