implement ls gnu coreutil

coreutils/ls.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <string.h>
+
+#define MAX_LEN 1000
+
+int main(int argc, char *argv[]) {
+  if (argc != 1) {
+    printf("Only support one command `ls` without any path param\n");
+    return -1;
+  }
+
+  char path[MAX_LEN];
+  getcwd(path, MAX_LEN);
+  if (!path) {
+    printf("Unable to get current path\n");
+    return -1;
+  }
+
+  printf("Current path: %s\n", path);
+
+  DIR *dir = opendir(path);
+  if (!dir) {
+    printf("Unable to view dir\n");
+    return -1;
+  }
+
+  struct dirent *next_item;
+  while ((next_item = readdir(dir)) != NULL) {
+    if (strlen(next_item->d_name) == 0 ||
+	next_item->d_name[0] == '.') {
+      continue;
+    }
+    printf("item: %s\n", next_item->d_name);
+  }
+  
+  closedir(dir);
+}