init commit

3sem/cnts/contest7/03.c

@@ -0,0 +1,67 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <string.h>
+#include <errno.h>
+#include <linux/limits.h>
+
+void
+check_and_sum_files(const char *dir1, const char *dir2, off_t *total_size)
+{
+    DIR *d1 = opendir(dir1);
+    if (!d1) {
+        return;
+    }
+
+    struct dirent *entry;
+    while ((entry = readdir(d1)) != NULL) {
+        char path1[PATH_MAX];
+        int r = snprintf(path1, sizeof(path1), "%s/%s", dir1, entry->d_name);
+        if (r < 0 || r >= sizeof(path1)) {
+            _exit(1);
+        }
+
+        struct stat st1;
+        if (lstat(path1, &st1) == -1 || !S_ISREG(st1.st_mode)) {
+            continue;
+        }
+
+        if (access(path1, W_OK) == 0) {
+            char path2[PATH_MAX];
+            r = snprintf(path2, sizeof(path2), "%s/%s", dir2, entry->d_name);
+            if (r < 0 || r >= sizeof(path2)) {
+                _exit(1);
+            }
+
+            struct stat st2;
+            if (stat(path2, &st2) == -1) {
+                continue;
+            }
+
+            if (S_ISREG(st2.st_mode) && st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) {
+                *total_size += st1.st_size;
+            }
+        }
+    }
+
+    closedir(d1);
+}
+
+int
+main(int argc, char *argv[])
+{
+    if (argc != 3) {
+        fprintf(stderr, "Usage: %s <directory1> <directory2>\n", argv[0]);
+        return 1;
+    }
+
+    off_t total_size = 0;
+    check_and_sum_files(argv[1], argv[2], &total_size);
+
+    printf("%ld\n", total_size);
+
+    return 0;
+}