refactor: remove dead API, rename to_disk/config_is_remote_dest, fix perror newlines

- Delete unused public array_list_extend (made static)
- Delete legacy 16-parameter parallel_scanner_create wrapper; migrate test to parallel_scanner_create_with_options
- Rename to_disk -> file_write_to_disk and is_remote_dest -> config_is_remote_dest for module_action naming convention
- Remove stray newlines in perror calls (perror already appends one)

src/client/client_send.c

@@ -739,7 +739,7 @@ int send_files_multithreaded(Config* config) {
     sender_created = (thrd_create(&sender, send_chunks_multithreaded, context) == thrd_success);
 
   if (!scanner_created || !loader_created || !sender_created) {
-    perror("Error creating threads.\n");
+    perror("Error creating threads");
     pipeline_cancel(context);
     mtx_lock(&context->mutex_progress);
     context->sender_done = true;
@@ -759,7 +759,7 @@ int send_files_multithreaded(Config* config) {
   if (config->show_progress) {
     progress_created = (thrd_create(&progress, progress_thread_fn, context) == thrd_success);
     if (!progress_created) {
-      perror("Error creating progress thread.\n");
+      perror("Error creating progress thread");
       /* Non-fatal; continue without progress reporting */
     }
   }

src/client/scanner.c

@@ -645,20 +645,6 @@ ParallelScanner* parallel_scanner_create_with_options(const char* root_directory
   return ps;
 }
 
-ParallelScanner* parallel_scanner_create(const char* root_directory, bool use_metadata,
-                                         unsigned long long chunk_size, char** exclude_patterns,
-                                         int exclude_count, char** include_patterns,
-                                         int include_count, unsigned long long max_size,
-                                         unsigned long long min_size, int max_depth,
-                                         int num_threads, bool follow_symlinks, bool copy_links,
-                                         bool safe_links, bool copy_unsafe_links, bool checksum) {
-  ScannerOptions options = {use_metadata,     chunk_size,        exclude_patterns, exclude_count,
-                            include_patterns, include_count,     max_size,         min_size,
-                            max_depth,        num_threads,       follow_symlinks,  copy_links,
-                            safe_links,       copy_unsafe_links, checksum};
-  return parallel_scanner_create_with_options(root_directory, &options);
-}
-
 Chunk* parallel_scanner_next(ParallelScanner* ps) {
   if (ps->initial_chunk) {
     Chunk* c = ps->initial_chunk;

src/client/scanner.h

@@ -77,13 +77,6 @@ Chunk* directory_scanner_next(DirectoryScanner* scanner);
 bool directory_scanner_failed(const DirectoryScanner* scanner);
 void directory_scanner_destroy(DirectoryScanner* scanner);
 
-ParallelScanner* parallel_scanner_create(const char* root_directory, bool use_metadata,
-                                         unsigned long long chunk_size, char** exclude_patterns,
-                                         int exclude_count, char** include_patterns,
-                                         int include_count, unsigned long long max_size,
-                                         unsigned long long min_size, int max_depth,
-                                         int num_threads, bool follow_symlinks, bool copy_links,
-                                         bool safe_links, bool copy_unsafe_links, bool checksum);
 ParallelScanner* parallel_scanner_create_with_options(const char* root_directory,
                                                       const ScannerOptions* options);
 Chunk* parallel_scanner_next(ParallelScanner* scanner);

src/shared/array_list.c

@@ -34,7 +34,7 @@ void array_list_delete(ArrayList* array_list) {
   free(array_list);
 }
 
-bool array_list_extend(ArrayList* array_list) {
+static bool array_list_extend(ArrayList* array_list) {
   if (array_list == NULL)
     return false;
   int new_capacity = array_list->capacity * 2;

src/shared/array_list.h

@@ -14,7 +14,6 @@ typedef struct ArrayList {
 
 ArrayList* array_list_create(void (*item_destroyer)(void* item));
 void array_list_delete(ArrayList* array_list);
-bool array_list_extend(ArrayList* array_list);
 bool array_list_add(ArrayList* array_list, void* item);
 void** array_list_to_array(const ArrayList* array_list);
 

src/shared/config.c

@@ -108,7 +108,7 @@ Config* config_create(void) {
   return config;
 }
 
-bool is_remote_dest(const char* s) {
+bool config_is_remote_dest(const char* s) {
   if (s == NULL)
     return false;
   const char* colon = strchr(s, ':');
@@ -124,7 +124,7 @@ bool is_remote_dest(const char* s) {
 }
 
 void config_parse_ssh_dest(Config* config) {
-  if (!is_remote_dest(config->receive_root_directory))
+  if (!config_is_remote_dest(config->receive_root_directory))
     return;
   config->transport = TRANSPORT_SSH;
   config->ssh_destination = str_dup(config->receive_root_directory);

src/shared/config.h

@@ -135,7 +135,7 @@ Config* config_create(void);
 void config_delete(Config* config);
 bool config_send(int file_descriptor, const Config* config);
 Config* config_receive(int file_descriptor);
-bool is_remote_dest(const char* s);
+bool config_is_remote_dest(const char* s);
 void config_parse_ssh_dest(Config* config);
 
 #endif

src/shared/file.c

@@ -647,7 +647,7 @@ File* receive_incremental_check(int fd, const Config* config, bool* skipped) {
   return file;
 }
 
-bool to_disk(const char* path, const void* data, unsigned long long data_size, bool inplace,
+bool file_write_to_disk(const char* path, const void* data, unsigned long long data_size, bool inplace,
              bool sparse) {
   if (!path || (!data && data_size != 0) || has_path_traversal(path))
     return false;

src/shared/file.h

@@ -35,7 +35,7 @@ bool file_send_sendfile(File* file, int file_descriptor, bool use_metadata, int
 size_t file_content_to_buffer(File* file);
 FileMetadata* file_metadata_create(const struct stat* stats);
 void file_metadata_destroy(void* metadata);
-bool to_disk(const char* path, const void* data, unsigned long long data_size, bool inplace,
+bool file_write_to_disk(const char* path, const void* data, unsigned long long data_size, bool inplace,
              bool sparse);
 bool file_save_to_disk(const char* root_directory, const File* file, const Config* config);
 bool file_set_authorized_root(int fd, const char* canonical_path);

tests/test_chunk.c

@@ -11,7 +11,7 @@ static void test_file_operations() {
   char* test_content = "Hello, Chunk System!";
   unsigned long long test_len = strlen(test_content);
 
-  to_disk(test_path, test_content, test_len, false, false);
+  file_write_to_disk(test_path, test_content, test_len, false, false);
 
   File* f = file_create(test_path);
   EXPECT_NOT_NULL(f);
@@ -43,8 +43,8 @@ static void test_chunk_operations() {
   char* content2 = "chunk item number 2";
   unsigned long long len2 = strlen(content2);
 
-  to_disk(path1, content1, len1, false, false);
+  file_write_to_disk(path1, content1, len1, false, false);
-  to_disk(path2, content2, len2, false, false);
+  file_write_to_disk(path2, content2, len2, false, false);
 
   struct stat st1, st2;
   stat(path1, &st1);

tests/test_compression.c

@@ -62,8 +62,8 @@ static void test_chunk_compress_decompress_roundtrip() {
   char* content2 = "chunk compression test file 2 with more data";
   unsigned long long len2 = strlen(content2);
 
-  to_disk(path1, content1, len1, false, false);
+  file_write_to_disk(path1, content1, len1, false, false);
-  to_disk(path2, content2, len2, false, false);
+  file_write_to_disk(path2, content2, len2, false, false);
 
   struct stat st1, st2;
   EXPECT_EQ_INT(stat(path1, &st1), 0);

tests/test_config.c

@@ -244,26 +244,26 @@ static void test_config_receive_truncated() {
   close(p[1]);
 }
 
-static void test_is_remote_dest() {
+static void test_config_is_remote_dest() {
   /* Valid SSH-style destinations */
-  EXPECT_TRUE(is_remote_dest("user@host:/path"));
+  EXPECT_TRUE(config_is_remote_dest("user@host:/path"));
-  EXPECT_TRUE(is_remote_dest("host:/path"));
+  EXPECT_TRUE(config_is_remote_dest("host:/path"));
-  EXPECT_TRUE(is_remote_dest("user@192.168.1.1:/remote/path"));
+  EXPECT_TRUE(config_is_remote_dest("user@192.168.1.1:/remote/path"));
 
   /* Invalid destinations */
-  EXPECT_FALSE(is_remote_dest(NULL));
+  EXPECT_FALSE(config_is_remote_dest(NULL));
-  EXPECT_FALSE(is_remote_dest(""));
+  EXPECT_FALSE(config_is_remote_dest(""));
-  EXPECT_FALSE(is_remote_dest(":"));
+  EXPECT_FALSE(config_is_remote_dest(":"));
-  EXPECT_FALSE(is_remote_dest("/local/path"));
+  EXPECT_FALSE(config_is_remote_dest("/local/path"));
-  EXPECT_FALSE(is_remote_dest("relative/path"));
+  EXPECT_FALSE(config_is_remote_dest("relative/path"));
   /* C:/windows/path is treated as remote (colon with no preceding slash) */
-  EXPECT_TRUE(is_remote_dest("C:/windows/path"));
+  EXPECT_TRUE(config_is_remote_dest("C:/windows/path"));
 
   /* Edge cases */
-  EXPECT_FALSE(is_remote_dest("noslash"));
+  EXPECT_FALSE(config_is_remote_dest("noslash"));
-  EXPECT_FALSE(is_remote_dest("/"));
+  EXPECT_FALSE(config_is_remote_dest("/"));
-  EXPECT_TRUE(is_remote_dest("host:"));
+  EXPECT_TRUE(config_is_remote_dest("host:"));
-  EXPECT_TRUE(is_remote_dest("user@host:"));
+  EXPECT_TRUE(config_is_remote_dest("user@host:"));
 }
 
 void test_config() {
@@ -278,5 +278,5 @@ void test_config() {
     test_config_send_receive_version_mismatch();
     test_config_receive_truncated();
   }
-  test_is_remote_dest();
+  test_config_is_remote_dest();
 }

tests/test_file.c

@@ -34,7 +34,7 @@ static void test_file_destroy_normal() {
 
 static void test_file_load_data() {
   const char* content = "Hello Load Test";
-  EXPECT_TRUE(to_disk("test_file_load_data.txt", content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk("test_file_load_data.txt", content, strlen(content), false, false));
 
   struct stat st;
   EXPECT_EQ_INT(stat("test_file_load_data.txt", &st), 0);
@@ -87,15 +87,15 @@ static void test_file_save_to_disk() {
   rmdir("test_save_tmp");
 }
 
-static void test_to_disk_basic() {
+static void test_file_write_to_disk_basic() {
-  const char* content = "Basic to_disk test";
+  const char* content = "Basic file_write_to_disk test";
-  EXPECT_TRUE(to_disk("test_to_disk_basic.txt", content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk("test_file_write_to_disk_basic.txt", content, strlen(content), false, false));
 
   struct stat st;
-  EXPECT_EQ_INT(stat("test_to_disk_basic.txt", &st), 0);
+  EXPECT_EQ_INT(stat("test_file_write_to_disk_basic.txt", &st), 0);
   EXPECT_EQ_INT((int)st.st_size, (int)strlen(content));
 
-  FILE* fp = fopen("test_to_disk_basic.txt", "rb");
+  FILE* fp = fopen("test_file_write_to_disk_basic.txt", "rb");
   EXPECT_NOT_NULL(fp);
   char buf[100];
   size_t nread = fread(buf, 1, sizeof(buf), fp);
@@ -103,12 +103,12 @@ static void test_to_disk_basic() {
   EXPECT_EQ_INT((int)nread, (int)strlen(content));
   EXPECT_EQ_INT(memcmp(buf, content, strlen(content)), 0);
 
-  unlink("test_to_disk_basic.txt");
+  unlink("test_file_write_to_disk_basic.txt");
 }
 
-static void test_to_disk_creates_dirs() {
+static void test_file_write_to_disk_creates_dirs() {
   const char* content = "Nested dir test";
-  EXPECT_TRUE(to_disk("test_nested_tmp/nested/file.txt", content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk("test_nested_tmp/nested/file.txt", content, strlen(content), false, false));
 
   struct stat st;
   EXPECT_EQ_INT(stat("test_nested_tmp/nested/file.txt", &st), 0);
@@ -126,15 +126,15 @@ static void test_to_disk_creates_dirs() {
   rmdir("test_nested_tmp");
 }
 
-static void test_to_disk_does_not_follow_symlink() {
+static void test_file_write_to_disk_does_not_follow_symlink() {
-  const char* outside = "test_to_disk_outside.txt";
+  const char* outside = "test_file_write_to_disk_outside.txt";
-  const char* link = "test_to_disk_link.txt";
+  const char* link = "test_file_write_to_disk_link.txt";
   const char* content = "confined";
   unlink(outside);
   unlink(link);
-  EXPECT_TRUE(to_disk(outside, "outside", 7, false, false));
+  EXPECT_TRUE(file_write_to_disk(outside, "outside", 7, false, false));
   EXPECT_EQ_INT(symlink(outside, link), 0);
-  EXPECT_TRUE(to_disk(link, content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk(link, content, strlen(content), false, false));
   FILE* fp = fopen(outside, "rb");
   char buf[16] = {0};
   EXPECT_NOT_NULL(fp);
@@ -151,7 +151,7 @@ static void test_to_disk_does_not_follow_symlink() {
 
 static void test_file_content_to_buffer() {
   const char* content = "Buffer content test";
-  EXPECT_TRUE(to_disk("test_buffer_file.txt", content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk("test_buffer_file.txt", content, strlen(content), false, false));
 
   File* f = file_create("test_buffer_file.txt");
   EXPECT_NOT_NULL(f);
@@ -273,7 +273,7 @@ static void test_file_send_no_path() {
 }
 
 static void test_file_metadata_create() {
-  EXPECT_TRUE(to_disk("test_meta_file.txt", "metadata test", 13, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_meta_file.txt", "metadata test", 13, false, false));
   struct stat st;
   EXPECT_EQ_INT(stat("test_meta_file.txt", &st), 0);
 
@@ -382,7 +382,7 @@ static void test_file_send_single_calls_metadata_and_path() {
   /* Create a real file on disk so we can have metadata */
   const char* content = "File with metadata";
   size_t len = strlen(content);
-  EXPECT_TRUE(to_disk("test_meta_send.txt", content, len, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_meta_send.txt", content, len, false, false));
 
   struct stat st;
   EXPECT_EQ_INT(stat("test_meta_send.txt", &st), 0);
@@ -455,9 +455,9 @@ void test_file() {
   test_file_load_data();
   test_file_load_data_missing_file();
   test_file_save_to_disk();
-  test_to_disk_basic();
+  test_file_write_to_disk_basic();
-  test_to_disk_creates_dirs();
+  test_file_write_to_disk_creates_dirs();
-  test_to_disk_does_not_follow_symlink();
+  test_file_write_to_disk_does_not_follow_symlink();
   test_file_content_to_buffer();
   test_file_save_to_disk_path_traversal();
   test_file_save_to_disk_deep_traversal();

tests/test_file_sendfile.c

@@ -15,7 +15,7 @@
 static void test_sendfile_basic() {
   const char* content = "Hello from sendfile test!";
   size_t len = strlen(content);
-  EXPECT_TRUE(to_disk("test_sendfile_basic.txt", content, len, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_sendfile_basic.txt", content, len, false, false));
 
   File* file = file_create("test_sendfile_basic.txt");
   EXPECT_NOT_NULL(file);
@@ -77,7 +77,7 @@ static void test_sendfile_basic() {
 static void test_sendfile_empty_file() {
   const char* content = "";
   size_t len = 0;
-  EXPECT_TRUE(to_disk("test_sendfile_empty.txt", content, len, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_sendfile_empty.txt", content, len, false, false));
 
   File* file = file_create("test_sendfile_empty.txt");
   EXPECT_NOT_NULL(file);
@@ -156,7 +156,7 @@ static void test_sendfile_missing_file() {
 static void test_sendfile_compression_fallback() {
   const char* content = "Compression fallback content";
   size_t len = strlen(content);
-  EXPECT_TRUE(to_disk("test_sendfile_comp.txt", content, len, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_sendfile_comp.txt", content, len, false, false));
 
   struct stat st;
   EXPECT_EQ_INT(stat("test_sendfile_comp.txt", &st), 0);
@@ -222,7 +222,7 @@ static void test_sendfile_compression_fallback() {
 static void test_sendfile_no_path() {
   const char* content = "No path sendfile test";
   size_t len = strlen(content);
-  EXPECT_TRUE(to_disk("test_sendfile_nopath.txt", content, len, false, false));
+  EXPECT_TRUE(file_write_to_disk("test_sendfile_nopath.txt", content, len, false, false));
 
   File* file = file_create("test_sendfile_nopath.txt");
   EXPECT_NOT_NULL(file);

tests/test_fuzz_smoke.c

@@ -101,7 +101,7 @@ static void test_fuzz_delta_deserialize() {
 /* Smoke test for metadata_from_buf fuzz target */
 static void test_fuzz_metadata_from_buf() {
   /* Create a real file to get metadata from */
-  EXPECT_TRUE(to_disk("fuzz_meta_test.txt", "metadata test", 13, false, false));
+  EXPECT_TRUE(file_write_to_disk("fuzz_meta_test.txt", "metadata test", 13, false, false));
 
   struct stat st;
   EXPECT_EQ_INT(stat("fuzz_meta_test.txt", &st), 0);

tests/test_metadata.c

@@ -125,7 +125,7 @@ static void test_metadata_rejects_invalid_values() {
 static void test_file_restore_metadata() {
   const char* path = "temp_meta_restore_test.txt";
   const char* content = "test content";
-  EXPECT_TRUE(to_disk(path, content, strlen(content), false, false));
+  EXPECT_TRUE(file_write_to_disk(path, content, strlen(content), false, false));
 
   FileMetadata m;
   m.mode = 0644;

tests/test_property.c

@@ -84,7 +84,7 @@ static void test_property_chunk_roundtrip() {
     for (int i = 0; i < content_len; i++)
       content[i] = (char)(rand() % 256);
 
-    to_disk(path, content, content_len, false, false);
+    file_write_to_disk(path, content, content_len, false, false);
 
     struct stat st;
     stat(path, &st);

tests/test_robustness.c

@@ -13,7 +13,7 @@
 static void test_chunk_deserialize_truncated() {
   char* path = "test_rob_trunc.txt";
   char* content = "hello";
-  to_disk(path, content, strlen(content), false, false);
+  file_write_to_disk(path, content, strlen(content), false, false);
 
   struct stat st;
   stat(path, &st);

tests/test_scanner.c

@@ -7,7 +7,7 @@
 #include <unistd.h>
 
 static void create_test_file(const char* path, const char* content) {
-  (void)to_disk(path, content, strlen(content), false, false);
+  (void)file_write_to_disk(path, content, strlen(content), false, false);
 }
 
 static void test_scanner_single_file() {
@@ -394,8 +394,8 @@ static void test_parallel_scanner_root_chunks_without_workers() {
   create_test_file(file1, "a");
   create_test_file(file2, "b");
 
-  ParallelScanner* scanner = parallel_scanner_create(dir, false, 1, NULL, 0, NULL, 0, 0, 0, 0, 0,
+  ScannerOptions options = {false, 1, NULL, 0, NULL, 0, 0, 0, 0, 0, false, false, false, false, false};
-                                                     false, false, false, false, false);
+  ParallelScanner* scanner = parallel_scanner_create_with_options(dir, &options);
   EXPECT_NOT_NULL(scanner);
 
   int total_files = 0;