lib: add tc_fs_file_exists

src/include/tc_filesystem.h

@@ -1,14 +1,21 @@
 #pragma once
 
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/stat.h>
+
 // Contains functions and definitions for dealing with files
 
 #ifdef __cplusplus
 extern "C" {
 #endif
-
-// Get filename list from a folder
-char **tc_fs_folder_filenames();
     
+// Get filename list from a directory. Return value needs to be freed.
+char **tc_fs_dir_filenames(const char *dir_name, uint16_t *file_count);
+
+// Check if a file exists
+bool tc_fs_file_exists(const char *path);
+
 #ifdef __cplusplus
 }
 #endif

src/lib/posix/filesystem.c

@@ -0,0 +1,33 @@
+#include <tc_filesystem.h>
+#include <tc_common.h>
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <dirent.h>
+
+char **tc_fs_dir_filenames(const char *dir_name, uint16_t *file_count) {
+    char *file_names[512];
+    
+    struct dirent *entry;
+    DIR *dir = opendir(dir_name);
+    
+    uint16_t i = 0;
+    if (dir != NULL) {
+        while ((entry = readdir(dir)) != NULL) {
+            file_names[i] = entry->d_name;
+            i++;
+        }
+        closedir(dir);
+    }
+    else {
+        // Couldn't open dir
+        return NULL;
+    }
+    *file_count = i;
+    return tc_str_arr_dup(i, file_names);
+}
+
+bool tc_fs_file_exists(const char *path) {
+    struct stat buf;
+    return (stat(path, &buf) == 0);
+}