Added more tests

test/opener/opener.c

@@ -1,20 +1,86 @@
-
-
+#include <dirent.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <unistd.h>
+
+#define PATH_MAX 4096
+
 int main(int argc, char *argv[]) {
+  // Check for correct usage
   if (argc != 2) {
-    fprintf(stderr, "Usage: ./opener [FILENAME]");
+    fprintf(stderr, "Usage: %s <pathname>\n", argv[0]);
     return 1;
   }
 
-  int fd = open(argv[1], O_RDWR | O_CREAT);
-  if (fd == -1) {
-    perror("Cannot open file");
+  const char *path = argv[1];
+  struct stat statbuf;
+
+  // Stat the given path to determine if it's a directory
+  if (lstat(path, &statbuf) == -1) {
+    perror("lstat");
     return 1;
   }
-  close(fd);
 
-  return 0;
+  // Case 1: The path is not a directory
+  if (!S_ISDIR(statbuf.st_mode)) {
+    int fd = open(path, O_RDONLY);
+    if (fd == -1) {
+      perror("open");
+      return 1;
+    }
+    close(fd);
+    return 0;
+  }
+
+  // Case 2: The path is a directory
+  DIR *dirp = opendir(path);
+  if (dirp == NULL) {
+    perror("opendir");
+    return 1;
+  }
+
+  struct dirent *entry;
+  int success = 1;
+
+  while ((entry = readdir(dirp)) != NULL) {
+    // Skip . and ..
+    if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
+      continue;
+    }
+
+    // Construct the full path
+    char fullpath[PATH_MAX];
+    snprintf(fullpath, PATH_MAX, "%s/%s", path, entry->d_name);
+
+    // Stat the entry to check if it's a regular file
+    struct stat entry_stat;
+    if (lstat(fullpath, &entry_stat) == -1) {
+      perror("lstat");
+      success = 0;
+      break;
+    }
+
+    // Only process regular files
+    if (!S_ISREG(entry_stat.st_mode)) {
+      continue;
+    }
+
+    // Try to open and immediately close the file
+    int fd = open(fullpath, O_RDONLY);
+    if (fd == -1) {
+      perror("open");
+      success = 0;
+      break;
+    }
+    close(fd);
+  }
+
+  closedir(dirp);
+
+  return (success ? 0 : 1);
 }