init commit

3sem/seminars/l5/01.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <string.h>
+#include <linux/limits.h>
+
+int
+main(int argc, char *argv[])
+{
+    DIR *dir = opendir(argv[1]);
+    unsigned long long sum = 0;
+    struct dirent *de;
+    while (de = readdir(dir)) {
+        char *name = calloc(PATH_MAX, sizeof(char));
+        snprintf(name, PATH_MAX, "%s/%s", argv[1], de->d_name);
+
+        struct stat st;
+        if (lstat(name, &st) < 0) {
+            continue;
+        }
+        if (S_ISREG(st.st_mode)) {
+            sum += st.st_size;
+        }
+    }
+
+    closedir(dir);
+
+    printf("%d\n", sum);
+
+    return 0;
+}

3sem/seminars/l5/02.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <sys/stat.h>
+
+int
+main(int argc, char *argv[])
+{
+    DIR *dir = opendir(argv[1]);
+    struct dirent *de;
+    while (de = readdir(dir)) {
+        char *name = calloc(PATH_MAX, sizeof(char));
+        snprintf(name, PATH_MAX, "%s/%s", argv[1], de->d_name);
+
+        struct stat st;
+        if (lstat(name, &st) < 0) {
+            continue;
+        }
+        if (!(S_ISREG(st.st_mode))) {
+            continue;
+        }
+
+        if (access(name, 3)) {
+            continue;
+        }
+        int len = strlen(name);
+
+        if (name[len - 1] == '~' || (len >= 4 && strcmp(name + strlen(name) - 4, ".bak") == 0)) {
+            unlink(name);
+        }
+    }
+
+    closedir(dir);
+    return 0;
+}

3sem/seminars/l5/03.c

@@ -0,0 +1,66 @@
+// подкаталог пустой
+// совпадают айдишники
+// есть права у остальных на запись
+// rmdir
+
+#include <stdio.h>
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <sys/stat.h>
+
+int
+main(int argc, char *argv[])
+{
+    DIR *dir = opendir(argv[1]);
+    struct dirent *de;
+    while (de = readdir(dir)) {
+        if ((de->d_name[0] == '.' && strlen(de->d_name) == 1) ||
+            (strlen(de->d_name) == 2) && !strcmp(de->d_name, "..")) {
+            continue;
+        }
+        char *name = calloc(PATH_MAX, sizeof(char));
+        snprintf(name, PATH_MAX, "%s/%s", argv[1], de->d_name);
+
+        struct stat st;
+        if (lstat(name, &st) < 0) {
+            continue;
+        }
+        if (!(S_ISDIR(st.st_mode))) {
+            continue;
+        }
+
+        if (st.st_uid != getuid()) {
+            continue;
+        }
+
+        if (!(st.st_mode & 2)) {
+            continue;
+        }
+
+        int num_files = 0;
+        DIR *dirt = opendir(name);
+        while (readdir(dirt)) {
+            num_files++;
+            if (num_files > 2) {
+                break;
+            }
+        }
+
+        if (num_files > 2) {
+            continue;
+        }
+
+        closedir(dirt);
+        rmdir(name);
+    }
+
+    closedir(dir);
+    return 0;
+}