From e742a2673902af8dddc63de9ee765594fbcd3a84 Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Sat, 8 Jun 2024 11:45:55 +1000
Subject: [PATCH] DS: Support enumerating files in directory

---
 misc/macclassic/68APPL.r  |  4 ++--
 misc/macclassic/ppcAPPL.r |  4 ++--
 src/Platform_NDS.c        | 40 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/misc/macclassic/68APPL.r b/misc/macclassic/68APPL.r
index 272e6bfd6..5a714031a 100644
--- a/misc/macclassic/68APPL.r
+++ b/misc/macclassic/68APPL.r
@@ -18,6 +18,6 @@ resource 'SIZE' (-1) {
 	reserved,
 	reserved,
 	reserved,
-	3584 * 1024,
-	8192 * 1024
+	8192 * 1024, // preferred (maximum) memory size
+	3584 * 1024, // minimum memory size (enough to load launcher)
 };
diff --git a/misc/macclassic/ppcAPPL.r b/misc/macclassic/ppcAPPL.r
index 5d0c59166..9bea6198b 100644
--- a/misc/macclassic/ppcAPPL.r
+++ b/misc/macclassic/ppcAPPL.r
@@ -27,6 +27,6 @@ resource 'SIZE' (-1) {
 	reserved,
 	reserved,
 	reserved,
-	8192 * 1024,
-	8192 * 1024
+	8192 * 1024, // preferred (maximum) memory size
+	8192 * 1024  // minimum memory size
 };
diff --git a/src/Platform_NDS.c b/src/Platform_NDS.c
index 03765814f..355e94b04 100644
--- a/src/Platform_NDS.c
+++ b/src/Platform_NDS.c
@@ -30,6 +30,7 @@
 #include <netdb.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
+#include <dirent.h>
 #include "_PlatformConsole.h"
 
 const cc_result ReturnCode_FileShareViolation = 1000000000; // not used
@@ -136,7 +137,44 @@ int File_Exists(const cc_string* path) {
 }
 
 cc_result Directory_Enum(const cc_string* dirPath, void* obj, Directory_EnumCallback callback) {
-	return ERR_NOT_SUPPORTED;
+	cc_string path; char pathBuffer[FILENAME_SIZE];
+	char str[NATIVE_STR_LEN];
+	struct dirent* entry;
+	int res;
+
+	String_EncodeUtf8(str, dirPath);
+	DIR* dirPtr = opendir(str);
+	if (!dirPtr) return errno;
+
+	/* POSIX docs: "When the end of the directory is encountered, a null pointer is returned and errno is not changed." */
+	/* errno is sometimes leftover from previous calls, so always reset it before readdir gets called */
+	errno = 0;
+	String_InitArray(path, pathBuffer);
+
+	while ((entry = readdir(dirPtr))) {
+		path.length = 0;
+		String_Format1(&path, "%s/", dirPath);
+
+		/* ignore . and .. entry */
+		char* src = entry->d_name;
+		if (src[0] == '.' && src[1] == '\0') continue;
+		if (src[0] == '.' && src[1] == '.' && src[2] == '\0') continue;
+
+		int len = String_Length(src);
+		String_AppendUtf8(&path, src, len);
+
+		if (entry->d_type == DT_DIR) {
+			res = Directory_Enum(&path, obj, callback);
+			if (res) { closedir(dirPtr); return res; }
+		} else {
+			callback(&path, obj);
+		}
+		errno = 0;
+	}
+
+	res = errno; /* return code from readdir */
+	closedir(dirPtr);
+	return res;
 }
 
 static cc_result File_Do(cc_file* file, const cc_string* path, int mode, const char* type) {