xz: Change the way coder_run() and list_run() are called in main().

Previously, a function pointer was used to determine if coder_run() or
list_run() should be called in the main entry processing loop. This was
replaced by an extra function call to process_entry().

coder_run() and list_run() were changed to accept a file_pair * argument
instead of a filename. The common repeated code was moved to
process_entry() instead.

src/xz/args.c

@@ -789,11 +789,17 @@ args_parse(args_info *args, int argc, char **argv)
 #else
 	// List mode is only available when decoders are enabled and is
 	// only valid with .xz files.
-	if (opt_mode == MODE_LIST
+	if (opt_mode == MODE_LIST) {
-			&& opt_format != FORMAT_XZ
+		if (opt_format != FORMAT_XZ && opt_format != FORMAT_AUTO)
-			&& opt_format != FORMAT_AUTO)
 			message_fatal(_("--list works only on .xz files "
 					"(--format=xz or --format=auto)"));
+
+		// Unset opt_stdout so that io_open_src() won't accept
+		// special files.
+		opt_stdout = false;
+		// Set opt_force so that io_open_src() will follow symlinks.
+		opt_force = true;
+	}
 #endif
 
 #ifdef HAVE_LZIP_DECODER

src/xz/coder.c

@@ -1429,16 +1429,8 @@ coder_passthru(file_pair *pair)
 
 
 extern void
-coder_run(const char *filename)
+coder_run(file_pair *pair)
 {
-	// Set and possibly print the filename for the progress message.
-	message_filename(filename);
-
-	// Try to open the input file.
-	file_pair *pair = io_open_src(filename);
-	if (pair == NULL)
-		return;
-
 	// Assume that something goes wrong.
 	bool success = false;
 

src/xz/coder.h

@@ -83,7 +83,7 @@ extern void coder_add_filter(lzma_vli id, void *options);
 extern void coder_set_compression_settings(void);
 
 /// Compress or decompress the given file
-extern void coder_run(const char *filename);
+extern void coder_run(file_pair *pair);
 
 #ifndef NDEBUG
 /// Free the memory allocated for the coder and kill the worker threads.

src/xz/list.c

@@ -1274,26 +1274,10 @@ list_totals(void)
 
 
 extern void
-list_file(const char *filename)
+list_file(file_pair *pair)
 {
-	message_filename(filename);
-
-	if (filename == stdin_filename) {
-		message_error(_("--list does not support reading from "
-				"standard input"));
-		return;
-	}
-
 	init_field_widths();
 
-	// Unset opt_stdout so that io_open_src() won't accept special files.
-	// Set opt_force so that io_open_src() will follow symlinks.
-	opt_stdout = false;
-	opt_force = true;
-	file_pair *pair = io_open_src(filename);
-	if (pair == NULL)
-		return;
-
 	xz_file_info xfi = XZ_FILE_INFO_INIT;
 	if (!parse_indexes(&xfi, pair)) {
 		bool fail;

src/xz/list.h

@@ -11,7 +11,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 /// \brief      List information about the given .xz file
-extern void list_file(const char *filename);
+extern void list_file(file_pair *pair);
 
 
 /// \brief      Show the totals after all files have been listed

src/xz/main.c

@@ -146,6 +146,34 @@ read_name(const args_info *args)
 }
 
 
+static void
+process_entry(const char *path)
+{
+	// Set and possibly print the filename for the progress message.
+	message_filename(path);
+
+	// Open the entry
+	file_pair *pair = io_open_src(path);
+	if (pair == NULL)
+		return;
+
+#ifdef HAVE_DECODERS
+	if (opt_mode == MODE_LIST) {
+		if (path == stdin_filename) {
+			message_error(_("--list does not support reading from "
+					"standard input"));
+			return;
+		}
+
+		list_file(pair);
+		return;
+	}
+#endif
+
+	coder_run(pair);
+}
+
+
 int
 main(int argc, char **argv)
 {
@@ -256,14 +284,6 @@ main(int argc, char **argv)
 		io_allow_sandbox();
 #endif
 
-	// coder_run() handles compression, decompression, and testing.
-	// list_file() is for --list.
-	void (*run)(const char *filename) = &coder_run;
-#ifdef HAVE_DECODERS
-	if (opt_mode == MODE_LIST)
-		run = &list_file;
-#endif
-
 	// Process the files given on the command line. Note that if no names
 	// were given, args_parse() gave us a fake "-" filename.
 	for (unsigned i = 0; i < args.arg_count && !user_abort; ++i) {
@@ -298,7 +318,7 @@ main(int argc, char **argv)
 		}
 
 		// Do the actual compression or decompression.
-		run(args.arg_names[i]);
+		process_entry(args.arg_names[i]);
 	}
 
 	// If --files or --files0 was used, process the filenames from the
@@ -314,7 +334,7 @@ main(int argc, char **argv)
 
 			// read_name() doesn't return empty names.
 			assert(name[0] != '\0');
-			run(name);
+			process_entry(name);
 		}
 
 		if (args.files_name != stdin_filename)