ajout fonction write to file ok

main.c

@@ -7,8 +7,8 @@ void foo(int* elem){
 int main(){
     matrix m;
     pgm p;
+    pmg_read_from_file(&p, "./img/mandrill.pgm");
+    pmg_write_to_file(&p, "./img/mandrill2.pgm");
 
 
-    pmg_read_from_file(&p, "./img/mandrill.pgm");
-    
 }
\ No newline at end of file

pgm.c

@@ -48,3 +48,32 @@ pgm_error pmg_read_from_file(pgm *p, char *filename)
     return success;
 }
 
+pgm_error pmg_write_to_file(pgm *p, char *filename){
+    FILE *f = fopen(filename, "w");
+    if (NULL == f)
+    {
+        fprintf(stderr, "Can't open output file %s!\n",
+                filename); // affiche dans le canal d'erreur
+        exit(0);
+    }
+
+    //Ecrit le type de fichier a la première ligne
+    fprintf(f, "P5\n");
+    fprintf(f, "%d %d\n", p->pixels.m, p->pixels.n);
+
+    int32_t elem;
+    
+    for (int i = 0; i < p->pixels.m; i++) {
+        for (int j = 0; j < p->pixels.n; j++)
+        {
+            if(matrix_get(&elem, p->pixels, i, j) != OK){
+                return failure;
+            };
+            fwrite(&elem, sizeof(uint8_t), 1, f);
+        }
+    }
+    fprintf(f, "%d %d\n", p->pixels.m, p->pixels.n);
+    fclose(f);
+    
+    return success;
+}