Added an inefficient listing for entries

src/entry.c

@@ -8,6 +8,7 @@
 #include <errno.h>
 #include <unistd.h>
 #include <libgen.h>
+#include <dirent.h>
 #include <sys/stat.h>
 
 bool is_entry_id_valid(const char* entry_id) {
@@ -230,6 +231,79 @@ Result remove_entry(const char* entry_id) {
 	return SUCCESS;
 }
 
+Result list_entries(char*** out_entries) {
+	*out_entries = malloc(sizeof(char*));
+	if (*out_entries == NULL) {
+		log_message(LOG_LEVEL_ERROR, "Failed to allocate memory for the entries.");
+		return OUT_OF_MEMORY;
+	}
+
+	(*out_entries)[0] = NULL;
+
+	// Open the directory
+	DIR* dir = opendir(ENTRY_POOL_DIR);
+	if (dir == NULL) {
+		log_message(LOG_LEVEL_ERROR, "Failed to open the directory '%s' (%s).", ENTRY_POOL_DIR, strerror(errno));
+		return FAILURE;
+	}
+
+	// Read the directory
+	int entry_count = 0;
+
+	struct dirent* entry;
+
+	while ((entry = readdir(dir)) != NULL) {
+		// Skip the current and parent directories
+		if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0)
+			continue;
+
+		// Check that the entry exists
+		bool exists;
+		Result result = entry_exists(entry->d_name, &exists);
+		if (result != SUCCESS || !exists)
+			continue;
+
+		// Reallocate the entries array
+		// TODO: More efficient reallocation
+		char** new_entries = realloc(*out_entries, (entry_count + 2) * sizeof(char*));
+		if (new_entries == NULL) {
+			log_message(LOG_LEVEL_ERROR, "Failed to allocate memory for the entries.");
+			closedir(dir);
+
+			for (int i = 0; i < entry_count; i++)
+				free((*out_entries)[i]);
+			free(*out_entries);
+
+			return OUT_OF_MEMORY;
+		}
+
+		*out_entries = new_entries;
+
+		// Copy the entry name
+		(*out_entries)[entry_count] = strdup(entry->d_name);
+		if ((*out_entries)[entry_count] == NULL) {
+			log_message(LOG_LEVEL_ERROR, "Failed to allocate memory for the entry name.");
+			closedir(dir);
+
+			for (int i = 0; i < entry_count; i++)
+				free((*out_entries)[i]);
+			free(*out_entries);
+
+			return OUT_OF_MEMORY;
+		}
+
+		// Null-terminate the array
+		(*out_entries)[entry_count + 1] = NULL;
+
+		entry_count++;
+	}
+
+	// Close the directory
+	closedir(dir);
+
+	return SUCCESS;
+}
+
 Result reset_entry(const char* entry_id) {
 	// Check that it exists
 	bool exists;

src/entry.h

@@ -16,9 +16,9 @@ typedef enum {
 	ENTRY_TYPE_AUTOMATIC
 } EntryType;
 
-#define ENTRY_TYPE_ROOT_STRING "root"
-#define ENTRY_TYPE_BACKED_STRING "backed"
-#define ENTRY_TYPE_AUTOMATIC_STRING "automatic"
+#define ENTRY_TYPE_ROOT_STRING "ROOT"
+#define ENTRY_TYPE_BACKED_STRING "BACKED"
+#define ENTRY_TYPE_AUTOMATIC_STRING "AUTOMATIC"
 
 typedef struct {
 	EntryType type;
@@ -103,6 +103,11 @@ Result reset_entry(const char* entry_id);
 /// @return The result of the operation.
 Result update_entry(const char* entry_id);
 
+/// @brief Checks whether the given entry needs to be updated, and updates it if needed. This function will only update automatic entries.
+/// @param entry_id The entry id.
+/// @return The result of the operation.
+Result check_update_entry(const char* entry_id);
+
 /// @brief Gathers information about the given entry.
 /// @param entry_id The entry id.
 /// @param out_info The pointer to the output entry information.

src/utils.c

@@ -342,3 +342,34 @@ Result write_file(const char* path, const char* string) {
 
 	return result;
 }
+
+Result format_size(uint64_t size, char** out_string) {
+	*out_string = NULL;
+
+	// Determine the unit
+	const char* unit;
+	double value;
+
+	if (size < 1024ULL) {
+		unit = "B";
+		value = size;
+	} else if (size < 1024ULL * 1024) {
+		unit = "KiB";
+		value = (double)size / 1024;
+	} else if (size < 1024ULL * 1024 * 1024) {
+		unit = "MiB";
+		value = (double)size / (1024 * 1024);
+	} else if (size < 1024ULL * 1024 * 1024 * 1024) {
+		unit = "GiB";
+		value = (double)size / (1024 * 1024 * 1024);
+	} else if (size < 1024ULL * 1024 * 1024 * 1024 * 1024) {
+		unit = "TiB";
+		value = (double)size / (1024 * 1024 * 1024 * 1024);
+	} else {
+		unit = "PiB";
+		value = (double)size / (1024 * 1024 * 1024 * 1024 * 1024);
+	}
+
+	// Format the string
+	return format(out_string, "%.2f%s", value, unit);
+}

src/utils.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include <stdbool.h>
+#include <stdint.h>
+
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
 typedef enum {
@@ -64,4 +67,10 @@ Result write_fd(int fd, const char* string);
 /// @param path The path of the file to write.
 /// @param string The string to write.
 /// @return The result of the operation.
-Result write_file(const char* path, const char* string);
+Result write_file(const char* path, const char* string);
+
+/// @brief Converts a size in bytes to a human-readable string.
+/// @param size The size in bytes.
+/// @param out_string The pointer to the output string. The caller is responsible for freeing the memory.
+/// @return The result of the operation.
+Result format_size(uint64_t size, char** out_string);