TP 13 exo1: Implement all the required features.

[TD_C.git] / TP_13 / exo1 / lib / array.c

diff --git a/TP_13/exo1/lib/array.c b/TP_13/exo1/lib/array.c
index f7e324f662e21e73bb86c8bcc1850d9ae36b1b72..ec612c1f82bd769dee7883aca6228a96397ff91c 100644 (file)
--- a/TP_13/exo1/lib/array.c
+++ b/TP_13/exo1/lib/array.c
@@ -1,18 +1,17 @@
 #include <stdlib.h>
+#include <stdio.h>
 
 #include "array.h"
 
 int* create_tab(int tab[], unsigned tab_size) {
     tab = malloc(sizeof(int) * tab_size);
-    if (tab == NULL) {
-        return NULL;
-    } else {
+    if (tab != NULL) {
         /* initialize to zero the integer array */
         for (unsigned i = 0; i < tab_size; i++) {
             tab[i] = 0;
         }
-        return tab;
     }
+    return tab;
 }
 
 void free_tab(int tab[]) {
@@ -23,26 +22,28 @@ void free_tab(int tab[]) {
 static void copy_tab(int src_tab[], int dest_tab[], unsigned src_tab_size, unsigned index_offset) {
     /* FIXME: I think it's worth doing some sanity checks on the array size:
      * dest_tab_size >= src_tab_size */
+    if (src_tab == NULL || dest_tab == NULL) {
+        printf("please ensure you have created both arrays beforehand\n");
+        return;
+    }
     for (unsigned i = 0; i < src_tab_size; i++) {
         dest_tab[i + index_offset] = src_tab[i];
     }
 }
 
-int* concat_tab(int tab1[], unsigned tab_size1, int tab2[], unsigned tab_size2, int tab_dest[]) {
-    int* rt = create_tab(tab_dest, tab_size1 + tab_size2);
+/* one must free the two source tabs in case they will be unused after to concatenation  */
+int* concat_tab(int tab1[], unsigned tab_size1, int tab2[], unsigned tab_size2) {
+    int* tab_dest = NULL;
+    tab_dest = create_tab(tab_dest, tab_size1 + tab_size2);
 
     copy_tab(tab1, tab_dest, tab_size1, 0);
     copy_tab(tab2, tab_dest, tab_size2, tab_size1);
-    return rt;
+    return tab_dest;
 }
 
 int* resize_tab(int tab[], unsigned new_tab_size) {
     tab = realloc(tab, sizeof(int) * new_tab_size);
-    if (tab == NULL) {
-        return NULL;
-    } else {
-        return tab;
-    }
+    return tab;
 }
 
 /* number of occurences of an element in an unsorted array  */