Initial commitHEADmaster

1 files changed, 106 insertions, 0 deletions

diff --git a/fileop.c b/fileop.c
new file mode 100644
index 0000000..52e5b6d
--- /dev/null
+++ b/fileop.c
@@ -0,0 +1,106 @@
+/* ------------------------------------------------------------------
+ * fileop.c
+ * File related operations, such as searching file in path, list of 
+ * files in some dir.
+ * ----------------------------------------------------------------*/
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "test_commands.h"
+
+#define MAX_FILEPATH_LENGTH (256)
+
+/* to check wether a given name is a directory or not
+ * Input:
+ *   - name: the name to be checked.
+Return:
+ *   - 1: if is a directory
+ *   - 0: if not a directory, or file <name> doesn't exist, error
+ */
+static int is_dir(const char* name)
+{
+	struct stat buf;  
+
+	if (lstat(name, &buf) < 0)
+		return 0; /* if not exist, error */
+
+	/*if is directory return 1 ,else return 0*/ 
+	return S_ISDIR(buf.st_mode);
+}
+
+
+/* search target file with <name> in directory <path>
+ * Input:
+ *   - path: the path to be searched in
+ *   - name: file name to be searched
+ * Return:
+ *   - -1： error
+ *   - 1: found
+ *   - 0: not found
+ */
+int search_file(const char* path, const char* name)
+{
+	int ret = -1;
+	DIR* directory;
+	struct dirent* dir_entry;
+	char current_filename[MAX_FILEPATH_LENGTH];
+
+	TDBG("Enter %s. name=%s; path=%s\n", __FUNCTION__, name, path);
+	if ((directory = opendir(path)) == NULL) {
+		printf("Error opendir(%s)\n", path);
+		return -1;
+	}
+
+	while (dir_entry = readdir(directory)) {
+		TDBG("dir_entry->d_name is \"%s\"\n", dir_entry->d_name);
+		/* To check wether this is a directory */
+		if (!strcmp(dir_entry->d_name, ".") ||
+			!strcmp(dir_entry->d_name, "..")) {
+			/* skip */
+			continue;
+		}
+		else {
+			/* if is root directory */
+			if ((strcmp(path, "/")) == 0)
+				ret = snprintf(current_filename, MAX_FILEPATH_LENGTH, "%s%s", path, dir_entry->d_name);
+			/* if is not root directory */
+			else
+				ret = snprintf(current_filename, MAX_FILEPATH_LENGTH, "%s%s", path, dir_entry->d_name);
+			/* check if truncated */
+			if (ret >= MAX_FILEPATH_LENGTH) {
+				printf("Critical error: exceed MAX_FILEPATH_LENGTH.\n");
+				closedir(directory);
+				return -1;
+			}
+		}
+
+		TDBG("Now tracking file (full path): %s\n", current_filename);
+
+		/* if is a directory, recursively call search_file */
+		if (is_dir(current_filename)) {
+			ret = search_file(current_filename, name);
+			if (ret == 1) {
+				TDBG("File: %s is found in directory %s\n", name, current_filename);
+				closedir(directory);
+				return ret;
+			}
+		}
+		else {
+			if (strcmp(dir_entry->d_name, name) == 0) {
+				TDBG("File: %s is found in directory %s.\n", name, current_filename);
+				closedir(directory);
+				return 1;
+			}
+		}		
+	}
+	closedir(directory);
+
+	/* no findings */
+	return 0;	
+}