TFTP

* Fix null terminated string in init_index
* Add check if out of memory
* Add debug message for file index.txt
* Add MAX_VIRT_FILES

project/Core/Src/tftp.c

@@ -10,6 +10,7 @@
 #define VIRT_IMAGE_BMP 1
 #define VIRT_IMAGE_GIF 2
 #define VIRT_TEXT_TXT  3
+#define MAX_VIRT_FILES 4
 
 #define IMAGE_BUFFER_SIZE 81920
 
@@ -240,7 +241,7 @@ int tftp_write(void* handle, struct pbuf* p) {
 void init_index(void) {
     size_t len = 0;
     // Add len of the virt files to the size
-    for (int i = 0; i < 2; i++) {
+    for (int i = 0; i < MAX_VIRT_FILES; i++) {
         len += strlen(virt_file[i].name) + 1;
     }
     void* mem = NULL;   // Pointer for internal use by the llfs library
@@ -249,10 +250,14 @@ void init_index(void) {
         len += strlen(file->name) + 1;
     }
     len++; // +1 for the \0
-    virt_file[VIRT_INDEX_TXT].data = malloc(len);
+    virt_file[VIRT_INDEX_TXT].data = calloc(len, sizeof(char));
+    if (virt_file[VIRT_INDEX_TXT].data == NULL) {
+        LOG_FATAL(TAG, "Could not allocate memory for index.txt");
+        return;
+    }
     virt_file[VIRT_INDEX_TXT].len = len;
 
-    for (int i = 0; i < 2; i++) {
+    for (int i = 0; i < MAX_VIRT_FILES; i++) {
         str_cat_str(virt_file[VIRT_INDEX_TXT].data, len, virt_file[i].name);
         str_cat(virt_file[VIRT_INDEX_TXT].data, len, '\n');
     }
@@ -275,6 +280,7 @@ void tftp_server_init(void) {
     LOG_INFO(TAG, "Initializing tftp server");
     // init the index.txt virt_file
     init_index();
+    LOG_DEBUG(TAG, "index.txt: %s", virt_file[VIRT_INDEX_TXT].data);
     // init the virtImage.raw virt_file with 80kb of ram
     virt_file[VIRT_IMAGE_BMP].data = calloc(IMAGE_BUFFER_SIZE, sizeof(char));
     if (virt_file[VIRT_IMAGE_BMP].data == NULL) {