Added fs usage example

fs/find/Makefile

@@ -0,0 +1,183 @@
+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+
+ifeq ($(strip $(DEVKITPRO)),)
+$(error "Please set DEVKITPRO in your environment. export DEVKITPRO=<path to>/devkitpro")
+endif
+
+TOPDIR ?= $(CURDIR)
+include $(DEVKITPRO)/libnx/switch_rules
+
+#---------------------------------------------------------------------------------
+# TARGET is the name of the output
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# DATA is a list of directories containing data files
+# INCLUDES is a list of directories containing header files
+# EXEFS_SRC is the optional input directory containing data copied into exefs, if anything this normally should only contain "main.npdm".
+#
+# NO_ICON: if set to anything, do not use icon.
+# NO_NACP: if set to anything, no .nacp file is generated.
+# APP_TITLE is the name of the app stored in the .nacp file (Optional)
+# APP_AUTHOR is the author of the app stored in the .nacp file (Optional)
+# APP_VERSION is the version of the app stored in the .nacp file (Optional)
+# APP_TITLEID is the titleID of the app stored in the .nacp file (Optional)
+# ICON is the filename of the icon (.jpg), relative to the project folder.
+#   If not set, it attempts to use one of the following (in this order):
+#     - <Project name>.jpg
+#     - icon.jpg
+#     - <libnx folder>/default_icon.jpg
+#---------------------------------------------------------------------------------
+TARGET		:=	$(notdir $(CURDIR))
+BUILD		:=	build
+SOURCES		:=	source
+DATA		:=	data
+INCLUDES	:=	include
+EXEFS_SRC	:=	exefs_src
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH	:=	-march=armv8-a -mtune=cortex-a57 -mtp=soft -fPIE
+
+CFLAGS	:=	-g -Wall -O2 -ffunction-sections \
+			$(ARCH) $(DEFINES)
+
+CFLAGS	+=	$(INCLUDE) -DSWITCH
+
+CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
+
+ASFLAGS	:=	-g $(ARCH)
+LDFLAGS	=	-specs=$(DEVKITPRO)/libnx/switch.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+
+LIBS	:= -lnx
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:= $(PORTLIBS) $(LIBNX)
+
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export TOPDIR	:=	$(CURDIR)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES	:=	$(addsuffix .o,$(BINFILES)) \
+			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+export BUILD_EXEFS_SRC := $(TOPDIR)/$(EXEFS_SRC)
+
+ifeq ($(strip $(ICON)),)
+	icons := $(wildcard *.jpg)
+	ifneq (,$(findstring $(TARGET).jpg,$(icons)))
+		export APP_ICON := $(TOPDIR)/$(TARGET).jpg
+	else
+		ifneq (,$(findstring icon.jpg,$(icons)))
+			export APP_ICON := $(TOPDIR)/icon.jpg
+		endif
+	endif
+else
+	export APP_ICON := $(TOPDIR)/$(ICON)
+endif
+
+ifeq ($(strip $(NO_ICON)),)
+	export NROFLAGS += --icon=$(APP_ICON)
+endif
+
+ifeq ($(strip $(NO_NACP)),)
+	export NROFLAGS += --nacp=$(CURDIR)/$(TARGET).nacp
+endif
+
+ifneq ($(APP_TITLEID),)
+	export NACPFLAGS += --titleid=$(APP_TITLEID)
+endif
+
+.PHONY: $(BUILD) clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD)
+
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).pfs0 $(TARGET).nso $(TARGET).nro $(TARGET).nacp $(TARGET).elf
+
+
+#---------------------------------------------------------------------------------
+else
+.PHONY:	all
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+all	:	$(OUTPUT).pfs0 $(OUTPUT).nro
+
+$(OUTPUT).pfs0	:	$(OUTPUT).nso
+
+$(OUTPUT).nso	:	$(OUTPUT).elf
+
+ifeq ($(strip $(NO_NACP)),)
+$(OUTPUT).nro	:	$(OUTPUT).elf $(OUTPUT).nacp
+else
+$(OUTPUT).nro	:	$(OUTPUT).elf
+endif
+
+$(OUTPUT).elf	:	$(OFILES)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	:	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

fs/find/README.md

@@ -0,0 +1,3 @@
+# find
+
+List files in the switch microSD card recursively.

fs/find/source/main.c

@@ -0,0 +1,107 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <switch.h>
+#include <switch/services/fs.h>
+
+const char* PADDING = "                                ";
+const size_t PADDING_LEN = 32;
+
+void recursivePrint(FsFileSystem* fs, const char* path, u8 depth);
+
+int main() {
+    gfxInitDefault();
+    consoleInit(NULL);
+
+    fsInitialize();
+
+    // Create a struct to hold the SD fs and mount it
+    FsFileSystem sd;
+    Result res = fsMountSdcard(&sd);
+
+    if (!res) {
+        puts("/");
+        recursivePrint(&sd, "/", 1);
+    } else {
+        printf("Could not mount sdcard (%d)\n", res);
+    }
+
+    puts("Done. Press + to exit");
+
+    // Main loop
+    while (appletMainLoop()) {
+        //Scan all the inputs. This should be done once for each frame
+        hidScanInput();
+
+        // Your code goes here
+
+        //hidKeysDown returns information about which buttons have been just pressed (and they weren't in the previous frame)
+        u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
+
+        if (kDown & KEY_PLUS) break; // break in order to return to hbmenu
+
+        gfxFlushBuffers();
+        gfxSwapBuffers();
+        gfxWaitForVsync();
+    }
+
+    gfxExit();
+    return 0;
+}
+
+void recursivePrint(FsFileSystem* fs, const char* path, u8 depth) {
+    FsDir dir;
+    Result res;
+    char* newpath;
+
+    // Open directory with flags to read both files and other directories
+    res = fsFsOpenDirectory(fs, path, FS_DIROPEN_DIRECTORY | FS_DIROPEN_FILE, &dir);
+    if (!res) {
+        // Get number of entries in dir.
+        u64 nEntries = 0;
+        fsDirGetEntryCount(&dir, &nEntries);
+
+        // Allocate memory for directory entries
+        FsDirectoryEntry* dirContents = calloc(nEntries, sizeof(FsDirectoryEntry));
+
+        // Actual read of directory entries
+        res = fsDirRead(&dir, 0, &nEntries, nEntries, dirContents);
+        if (!res && nEntries > 0) {
+            // For each entry...
+            for (int i = 0; i < nEntries; i++) {
+                // Print its name padded with spaces
+                fputs(PADDING + PADDING_LEN - depth, stdout); // Quick hax to avoid for () print (haha lol)
+                fputs(dirContents[i].name, stdout);
+
+                if (dirContents[i].type == ENTRYTYPE_DIR) {
+                    // If it is a directory, print a trailing slash, build the full path, and call recursively.
+                    fputs("/\n", stdout);
+
+                    newpath = strcpy(malloc(strlen(path) + strlen(dirContents[i].name) + 1 + 1), path);
+                    strcat(newpath, dirContents[i].name);
+                    strcat(newpath, "/");
+                    recursivePrint(fs, newpath, depth + 1);
+                    free(newpath);
+                } else {
+                    // If it is a file, just print a newline
+                    putc('\n', stdout);
+                }
+            }
+        } else {
+            // Verbose print if for some reason we were able to open a directory, but not to read its contents.
+            fputs(PADDING + PADDING_LEN - depth, stdout);
+            printf("Error listing contents of %s\n", path);
+        }
+
+        // Close directory. Failure to do this will make your program crash eventually, as there is a maximum of dirs
+        //  you can keep open.
+        fsDirClose(&dir);
+
+        // Free list of contents.
+        free(dirContents);
+    } else {
+        // If we can't open the directory, print a question mark.
+        fputs(PADDING + PADDING_LEN - depth, stdout);
+        puts("?");
+    }
+}