Added disk operation signatures

src/entry.c

@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 #include <sys/stat.h>
 
 bool is_entry_id_valid(const char* entry_id) {
@@ -12,21 +13,30 @@ bool is_entry_id_valid(const char* entry_id) {
 
 	size_t length = strlen(entry_id);
 
+	// Check that the length is valid
 	if (length == 0 || length > MAX_ENTRY_LENGTH)
 		return false;
 
+	// Check that the entry id does not contain any slashes
 	for (size_t i = 0; i < length; i++)
 		if (entry_id[i] == '/')
 			return false;
 
+	// Check that the entry id is not a reserved name
+	if (strcmp(entry_id, ".") == 0 || strcmp(entry_id, "..") == 0)
+		return false;
+
 	return true;
 }
 
 Result get_entry_path(const char* entry_id, char** out_path) {
 	*out_path = NULL;
 
-	if (!is_entry_id_valid(entry_id))
+	// Check that the entry id is valid
+	if (!is_entry_id_valid(entry_id)) {
+		log_message(LOG_LEVEL_ERROR, "Invalid entry id '%s'.", entry_id);
 		return FAILURE;
+	}
 
 	return format(out_path, "%s/%s", ENTRY_POOL_DIR, entry_id);
 }
@@ -34,17 +44,52 @@ Result get_entry_path(const char* entry_id, char** out_path) {
 Result entry_exists(const char* entry_id, bool* out_exists) {
 	*out_exists = false;
 
+	// Get the path of the entry
 	char* path;
 	Result result = get_entry_path(entry_id, &path);
 	if (result != SUCCESS)
 		return result;
 
+	// Check if the entry exists and is a directory
 	struct stat st;
 	bool exists = stat(path, &st) == 0 && S_ISDIR(st.st_mode);
 
+	// Free the path
 	free(path);
 
+	// Output the result
 	*out_exists = exists;
 
 	return SUCCESS;
 }
+
+Result add_entry(const char* entry_id) {
+	// Check if the entry already exists
+	bool exists;
+	Result result = entry_exists(entry_id, &exists);
+	if (result != SUCCESS)
+		return result;
+
+	if (exists) {
+		log_message(LOG_LEVEL_ERROR, "Entry '%s' already exists.", entry_id);
+		return FAILURE;
+	}
+
+	// Create the entry directory
+	char* path;
+	result = get_entry_path(entry_id, &path);
+	if (result != SUCCESS)
+		return result;
+
+	int result_code = mkdir(path, 0755);
+
+	free(path);
+
+	// Check if the operation failed
+	if (result_code != 0) {
+		log_message(LOG_LEVEL_ERROR, "Failed to create entry '%s' (%s).", entry_id, strerror(errno));
+		return FAILURE;
+	}
+
+	return SUCCESS;
+}