add random stuffs

cstring_node.h

@@ -0,0 +1,60 @@
+#pragma once
+
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+
+typedef struct cstring_node {
+    char* name;
+    struct cstring_node* next;
+} cstring_node;
+
+static inline void insert_command(cstring_node** head, const char* command) {
+    for (cstring_node* curr = *head; curr != NULL; curr = curr->next) {
+        if (strcmp(curr->name, command) == 0) return;
+    }
+
+    cstring_node* node = (cstring_node*)malloc(sizeof(cstring_node));
+    if (!node) return;
+
+    node->name = strdup(command);
+    if (!node->name) {
+        free(node);
+        return;
+    }
+
+    node->next = *head;
+    *head = node;
+}
+
+static inline void free_commands(cstring_node* head) {
+    while (head) {
+        cstring_node* next = head->next;
+        free(head->name);
+        free(head);
+        head = next;
+    }
+}
+
+static inline cstring_node* get_path_commands() {
+    char* path_env = getenv("PATH");
+    if (!path_env) return NULL;
+
+    cstring_node* head = NULL;
+    char* path_copy = strdup(path_env);
+
+    for (char* dir = strtok(path_copy, ":"); dir != NULL; dir = strtok(NULL, ":")) {
+        DIR* d = opendir(dir);
+        if (!d) continue;
+
+        struct dirent* entry;
+        while ((entry = readdir(d)) != NULL) {
+            if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) continue;
+            insert_command(&head, entry->d_name);
+        }
+        closedir(d);
+    }
+
+    free(path_copy);
+    return head;
+}