From 744eb2a2a571fa21a5524812b60ca8ebf9a65fe8 Mon Sep 17 00:00:00 2001
From: Thorsten Töpper <atsutane@freethoughts.de>
Date: Sat, 21 Jun 2025 16:39:59 +0200
Subject: Move data collection to other source

---
 src/list_management.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 82 insertions(+), 1 deletion(-)

(limited to 'src/list_management.c')

diff --git a/src/list_management.c b/src/list_management.c
index 582eccd..d1a93d3 100644
--- a/src/list_management.c
+++ b/src/list_management.c
@@ -8,6 +8,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <dirent.h>
+#include <sys/stat.h>
 
 #include "output.h"
 #include "list_management.h"
@@ -119,7 +121,7 @@ inline int insert_sorted_by_time(struct list_head *list, struct list_node *node)
 }
 
 
-struct list_head *create_list_sort_reversed(struct list_head *list) {
+inline struct list_head *create_list_sort_reversed(struct list_head *list) {
     struct list_head *lh = NULL;
     struct list_node *cpynode = NULL, *ptr = NULL;
     if (list == NULL) {
@@ -148,3 +150,82 @@ struct list_head *create_list_sort_reversed(struct list_head *list) {
     return lh;
 }
 
+/* This function contains the only time critical code. The loop over
+ * the directory content.
+ *
+ * Note for future:
+ * I myself use the dir_monitor in combination with watch on a directory
+ * containing temporary data, it may happen that a run into an error occurs,
+ * but it's not tragic. To reduce the chance of the error the first step
+ * would be to optimize the loop with putting the data into a list in stack
+ * form and moving the nodes into a sorted list afterwards.
+ */
+struct list_head *get_data_from_directory(char *path) {
+    char *fullpath = NULL, *fname_in_path = NULL;
+    DIR *dir = NULL;
+    size_t l;
+    struct dirent *de = NULL;
+    struct list_node *tmp = NULL;
+    struct list_head *list = NULL;
+    struct stat stat_res;
+
+    if (path == NULL) {
+        LOGERR("ERROR: No path given.\n");
+        return NULL;
+    }
+
+    l = strlen(path);
+    /* 258 filename and possibly required PATH_SEP and of course string termination */
+    if ((fullpath = calloc(l+258, sizeof(char))) == NULL) {
+        LOGERR("ERROR: Failed to allocate memory for list head.\n");
+        return NULL;
+    }
+    sprintf(fullpath, "%s%c", path, ((path[l-1] == PATH_SEP) ? '\0' : PATH_SEP));
+    fname_in_path = (fullpath[l] == PATH_SEP) ? &(fullpath[l+1]) : &(fullpath[l]) ;
+
+    if ((dir = opendir(path)) == NULL) {
+        LOGERR("ERROR: Failed to open directory '%s': %s (errno %d)\n",
+                path, strerror(errno), errno);
+        return NULL;
+    }
+
+    /* TBH: In case those few bytes are not available, the process will be killed anyways */
+    if ((list = calloc(1, sizeof(struct list_head))) == NULL) {
+        LOGERR("ERROR: Failed to allocate memory for list head.\n");
+        closedir(dir);
+        return NULL;
+    }
+
+    errno = 0;
+    /* Currently the code is specific UNIXoid, needs to be adjusted in case someone ports it. */
+    while ((de = readdir(dir)) != NULL) {
+        if (de->d_name[0] == '.' && option_show_hidden_entries == false)
+            continue;
+
+        sprintf(fname_in_path, "%s", de->d_name);
+        DBGTRC("DEBUG: fullpath: '%s'\n", fullpath);
+        if (lstat(fullpath, &stat_res) != 0) {
+            LOGERR("ERROR: lstat call on '%s' failed: %s (errno %d)\n",
+                    fullpath, strerror(errno), errno);
+            continue;
+        }
+        if ((tmp = create_node(de->d_name, &stat_res)) == NULL) {
+            LOGERR("ERROR: Skipping entry %s\n", de->d_name);
+            continue;
+        }
+        /* SORT_BY_SIZE is the default value, always check it first. */
+        switch (option_sort_type) {
+            case SORT_BY_SIZE:
+                insert_sorted_by_size(list, tmp);
+                break;
+            case SORT_BY_TIME:
+                insert_sorted_by_time(list, tmp);
+                break;
+        };
+    }
+
+    free(fullpath);
+    closedir(dir);
+    return list;
+}
+
-- 
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