refactor: store matrix struc on stack

Startcode/matrix.c

@@ -1,21 +1,23 @@
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "matrix.h"
 
-// TODO Matrix-Funktionen implementieren
-
 int getMatrixIndex(unsigned int cols, unsigned int rowIdx, unsigned int colIdx)
 {
     return rowIdx * cols + colIdx;
 }
 
-Matrix createMatrix(unsigned int rows, unsigned int cols)
+Matrix createMatrix(const unsigned int rows, const unsigned int cols)
 {
-    Matrix* m = malloc(sizeof(Matrix));
+    Matrix matrix = {.rows = rows, .cols = cols};
-    m->rows = rows;
+    matrix.storage = malloc(rows * cols * sizeof(MatrixType));
-    m->cols = cols;
+    return matrix;
-    m->storage = malloc(rows * cols * sizeof(MatrixType));
+}
-    return m;
+
+void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
+{
+    matrix.storage[getMatrixIndex(matrix.cols, rowIdx, colIdx)] = value;
 }
 
 void clearMatrix(Matrix *matrix)
@@ -24,16 +26,11 @@ void clearMatrix(Matrix *matrix)
     {
         for (unsigned int j = 0; j < matrix->cols; j++)
         {
-            setMatrixElement(matrix, i, j, UNDEFINED_MATRIX_VALUE);
+            setMatrixAt(UNDEFINED_MATRIX_VALUE, *matrix, i, j);
         }
     }
 }
 
-void setMatrixAt(MatrixType value, Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
-{
-    matrix.storage[getMatrixIndex(matrix.cols, rowIdx, colIdx)] = value;
-}
-
 MatrixType getMatrixAt(const Matrix matrix, unsigned int rowIdx, unsigned int colIdx)
 {
     return matrix.storage[getMatrixIndex(matrix.cols, rowIdx, colIdx)];
@@ -71,7 +68,7 @@ Matrix multiply(const Matrix matrix1, const Matrix matrix2)
 {
     if (matrix1.cols != matrix2.rows)
     {
-        fprintf(stderr, "Fehler: Spalten von Matrix 1 (%u) entsprechen nicht Zeilen von Matrix 2 (%u)\n",
+        printf("Fehler: Spalten von Matrix 1 (%u) entsprechen nicht Zeilen von Matrix 2 (%u)\n",
                 matrix1.cols, matrix2.rows);
         return (Matrix){ .rows = 0, .cols = 0, .storage = NULL };
     }