From: Andre Noll <maan@systemlinux.org>
Date: Sun, 1 Jun 2008 15:50:41 +0000 (+0200)
Subject: Move the code for the select command to its own file.
X-Git-Tag: v0.0.2~16
X-Git-Url: http://git.tuebingen.mpg.de/?a=commitdiff_plain;ds=sidebyside;h=cab88f141a9550dcceee0ad8eab978660e0ae0de;p=adu.git

Move the code for the select command to its own file.
---

diff --git a/Makefile b/Makefile
index ef94fcc..68e6443 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-objects := adu.o string.o cmdline.o fd.o
+objects := adu.o string.o cmdline.o fd.o select.o
 all: adu
 
 DEBUG_CPPFLAGS += -Wno-sign-compare -g -Wunused -Wundef -W
diff --git a/adu.c b/adu.c
index c3a278e..9a0e513 100644
--- a/adu.c
+++ b/adu.c
@@ -12,33 +12,21 @@
 DEFINE_ERRLIST;
 int osl_errno;
 
-/** Command line and config file options. */
-static struct gengetopt_args_info conf;
-
-enum uid_info_flags {
-	/** whether this slot of the hash table is used. */
-	UI_FL_SLOT_USED = 1,
-	/** whether this uid should be taken into account. */
-	UI_FL_ADMISSIBLE = 2,
-};
-
-struct user_info {
-	uint32_t uid;
-	uint32_t flags;
-	char *pw_name;
-	struct osl_table *table;
-	uint64_t files;
-	uint64_t bytes;
-	uint64_t dirs;
-	struct osl_table_description *desc;
-};
+/** In case a signal is received, its number is stored here. */
+static int signum;
 
-/** The decimal representation of an uint64_t never exceeds that size. */
-#define FORMATED_VALUE_SIZE 25
+/** Command line and config file options. */
+struct gengetopt_args_info conf;
 
-#define FOR_EACH_USER(ui) for (ui = uid_hash_table; ui && ui < uid_hash_table \
-		+ uid_hash_table_size; ui++)
+/** Global dir count. */
+uint64_t num_dirs = 0;
+/** Global files count. */
+uint64_t num_files = 0;
+/** Global bytes count. */
+uint64_t num_bytes = 0;
 
+/** The number of different uids found so far. */
+uint32_t num_uids = 0;
 
 /**
  * Contains info for each user that owns at least one regular file.
@@ -47,113 +35,20 @@ struct user_info {
  * option occupy a slot in this hash table. This allows to find out
  * quicky whether a uid is admissible. And yes, this has to be fast.
  */
-static struct user_info *uid_hash_table;
-
-/* these get filled in by the select command. */
-static char count_unit_buf[4] = "( )", size_unit_buf[4] = "( )";
-
-static inline int ui_used(struct user_info *ui)
-{
-	return ui->flags & UI_FL_SLOT_USED;
-}
-
-static inline int ui_admissible(struct user_info *ui)
-{
-	return ui->flags & UI_FL_ADMISSIBLE;
-}
-
-struct uid_range {
-	uint32_t low;
-	uint32_t high;
-};
-
-static struct uid_range *admissible_uids;
-
-static inline int check_uid_arg(const char *arg, uint32_t *uid)
-{
-	const uint32_t max = ~0U;
-	/*
-	 * we need an 64-bit int for string -> uid conversion because strtoll()
-	 * returns a signed value.
-	 */
-	int64_t val;
-	int ret = atoi64(arg, &val);
-
-	if (ret < 0)
-		return ret;
-	if (val < 0 || val > max)
-		return -ERRNO_TO_ERROR(EINVAL);
-	*uid = val;
-	return 1;
-}
-
-static int parse_uid_range(const char *orig_arg, struct uid_range *ur)
-{
-	int ret;
-	char *arg = adu_strdup(orig_arg), *p = strchr(arg, '-');
-
-	if (!p || p == arg) { /* -42 or 42 */
-		ret = check_uid_arg(p? p + 1 : arg, &ur->high);
-		if (ret < 0)
-			goto out;
-		ur->low = p? 0 : ur->high;
-		ret = 1;
-		goto out;
-	}
-	/* 42- or 42-4711 */
-	*p = '\0';
-	p++;
-	ret = check_uid_arg(arg, &ur->low);
-	if (ret < 0)
-		goto out;
-	ur->high = ~0U;
-	if (*p) { /* 42-4711 */
-		ret = check_uid_arg(p, &ur->high);
-		if (ret < 0)
-			goto out;
-	}
-	if (ur->low > ur->high)
-		ret = -ERRNO_TO_ERROR(EINVAL);
-out:
-	if (ret < 0)
-		ERROR_LOG("bad uid option: %s\n", orig_arg);
-	else
-		INFO_LOG("admissible uid range: %u - %u\n", ur->low,
-			ur->high);
-	free(arg);
-	return ret;
-}
+struct user_info *uid_hash_table = NULL;
 
-/** evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y */
-#define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
+/**
+ * The table containing the directory names and statistics.
+ */
+struct osl_table *dir_table = NULL;
 
 /**
- * The log function.
- *
- * \param ll Loglevel.
- * \param fml Usual format string.
- *
- * All XXX_LOG() macros use this function.
+ * The array of all uid ranges that were given at the command line.
  */
-__printf_2_3 void __log(int ll, const char* fmt,...)
-{
-	va_list argp;
-	FILE *outfd;
-	struct tm *tm;
-	time_t t1;
-	char str[255] = "";
+struct uid_range *admissible_uids;
 
-	if (ll < conf.loglevel_arg)
-		return;
-	outfd = stderr;
-	time(&t1);
-	tm = localtime(&t1);
-	strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
-	fprintf(outfd, "%s ", str);
-	va_start(argp, fmt);
-	vfprintf(outfd, fmt, argp);
-	va_end(argp);
-}
+/** Evaluates to 1 if x < y, to -1 if x > y and to 0 if x == y. */
+#define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 
 /**
  * Compare the size of two directories
@@ -200,22 +95,6 @@ static int uint64_compare(const struct osl_object *obj1,
 	return 0;
 }
 
-/** The columns of the directory table. */
-enum dir_table_columns {
-	/** The name of the directory. */
-	DT_NAME,
-	/** The dir count number. */
-	DT_NUM,
-	/** The number of the parent directory. */
-	DT_PARENT_NUM,
-	/** The number of bytes of all regular files. */
-	DT_BYTES,
-	/** The number of all regular files. */
-	DT_FILES,
-	/** Number of columns in this table. */
-	NUM_DT_COLUMNS
-};
-
 static struct osl_column_description dir_table_cols[] = {
 	[DT_NAME] = {
 		.storage_type = OSL_MAPPED_STORAGE,
@@ -259,18 +138,6 @@ static struct osl_table_description dir_table_desc = {
 	.column_descriptions = dir_table_cols,
 };
 
-/** The columns of the id table. */
-enum user_table_columns {
-	/** The numer of the directory. */
-	UT_DIR_NUM,
-	/** The number of bytes of all regular files in this dir owned by this id. */
-	UT_BYTES,
-	/** The number of files in this dir owned by this id. */
-	UT_FILES,
-	/** Number of columns in this table. */
-	NUM_UT_COLUMNS
-};
-
 static struct osl_column_description user_table_cols[] = {
 	[UT_DIR_NUM] = {
 		.storage_type = OSL_MAPPED_STORAGE,
@@ -295,7 +162,88 @@ static struct osl_column_description user_table_cols[] = {
 	},
 };
 
-static struct osl_table *dir_table;
+static int check_uid_arg(const char *arg, uint32_t *uid)
+{
+	const uint32_t max = ~0U;
+	/*
+	 * we need an 64-bit int for string -> uid conversion because strtoll()
+	 * returns a signed value.
+	 */
+	int64_t val;
+	int ret = atoi64(arg, &val);
+
+	if (ret < 0)
+		return ret;
+	if (val < 0 || val > max)
+		return -ERRNO_TO_ERROR(EINVAL);
+	*uid = val;
+	return 1;
+}
+
+static int parse_uid_range(const char *orig_arg, struct uid_range *ur)
+{
+	int ret;
+	char *arg = adu_strdup(orig_arg), *p = strchr(arg, '-');
+
+	if (!p || p == arg) { /* -42 or 42 */
+		ret = check_uid_arg(p? p + 1 : arg, &ur->high);
+		if (ret < 0)
+			goto out;
+		ur->low = p? 0 : ur->high;
+		ret = 1;
+		goto out;
+	}
+	/* 42- or 42-4711 */
+	*p = '\0';
+	p++;
+	ret = check_uid_arg(arg, &ur->low);
+	if (ret < 0)
+		goto out;
+	ur->high = ~0U;
+	if (*p) { /* 42-4711 */
+		ret = check_uid_arg(p, &ur->high);
+		if (ret < 0)
+			goto out;
+	}
+	if (ur->low > ur->high)
+		ret = -ERRNO_TO_ERROR(EINVAL);
+out:
+	if (ret < 0)
+		ERROR_LOG("bad uid option: %s\n", orig_arg);
+	else
+		INFO_LOG("admissible uid range: %u - %u\n", ur->low,
+			ur->high);
+	free(arg);
+	return ret;
+}
+
+/**
+ * The log function.
+ *
+ * \param ll Loglevel.
+ * \param fml Usual format string.
+ *
+ * All XXX_LOG() macros use this function.
+ */
+__printf_2_3 void __log(int ll, const char* fmt,...)
+{
+	va_list argp;
+	FILE *outfd;
+	struct tm *tm;
+	time_t t1;
+	char str[255] = "";
+
+	if (ll < conf.loglevel_arg)
+		return;
+	outfd = stderr;
+	time(&t1);
+	tm = localtime(&t1);
+	strftime(str, sizeof(str), "%b %d %H:%M:%S", tm);
+	fprintf(outfd, "%s ", str);
+	va_start(argp, fmt);
+	vfprintf(outfd, fmt, argp);
+	va_end(argp);
+}
 
 static int add_directory(char *dirname, uint64_t *dir_num, uint64_t *parent_dir_num,
 		uint64_t *dir_size, uint64_t *dir_files)
@@ -316,8 +264,6 @@ static int add_directory(char *dirname, uint64_t *dir_num, uint64_t *parent_dir_
 	return osl(osl_add_row(dir_table, dir_objects));
 }
 
-static uint32_t num_uids;
-
 static int open_user_table(struct user_info *ui, int create)
 {
 	int ret;
@@ -359,11 +305,11 @@ err:
 }
 
 #define uid_hash_bits 8
-static uint32_t uid_hash_table_size = 1 << uid_hash_bits;
+uint32_t uid_hash_table_size = 1 << uid_hash_bits;
 #define PRIME1 0x811c9dc5
 #define PRIME2 0x01000193
 
-static void create_hash_table(void)
+void create_hash_table(void)
 {
 	uid_hash_table = adu_calloc(uid_hash_table_size
 		* sizeof(struct user_info));
@@ -430,21 +376,19 @@ static void close_user_tables(void)
 		close_user_table(ui);
 }
 
-static void close_all_tables(void)
+void close_all_tables(void)
 {
 	close_dir_table();
 	close_user_tables();
 	free_hash_table();
 }
 
-static int signum;
-
 static void signal_handler(int s)
 {
 	signum = s;
 }
 
-static void check_signals(void)
+void check_signals(void)
 {
 	if (likely(!signum))
 		return;
@@ -484,11 +428,6 @@ static uint32_t double_hash(uint32_t uid, uint32_t probe_num)
 		% uid_hash_table_size;
 }
 
-enum search_uid_flags {
-	OPEN_USER_TABLE = 1,
-	CREATE_USER_TABLE = 2,
-};
-
 static int uid_is_admissible(uint32_t uid)
 {
 	int i;
@@ -505,7 +444,7 @@ static int uid_is_admissible(uint32_t uid)
 	return i;
 }
 
-static int search_uid(uint32_t uid, enum search_uid_flags flags,
+int search_uid(uint32_t uid, enum search_uid_flags flags,
 		struct user_info **ui_ptr)
 {
 	uint32_t p;
@@ -582,10 +521,6 @@ static int update_user_row(struct osl_table *t, uint64_t dir_num,
 	}
 }
 
-static uint64_t num_dirs;
-static uint64_t num_files;
-static uint64_t num_bytes;
-
 /* id of the device containing the base dir. */
 static dev_t device_id;
 
@@ -660,441 +595,7 @@ out:
 	return ret;
 }
 
-static int get_dir_name_by_number(uint64_t *dirnum, char **name)
-{
-	char *result = NULL, *tmp;
-	struct osl_row *row;
-	uint64_t val = *dirnum;
-	struct osl_object obj = {.data = &val, .size = sizeof(val)};
-	int ret;
-
-again:
-	ret = osl(osl_get_row(dir_table, DT_NUM, &obj, &row));
-	if (ret < 0)
-		goto out;
-	ret = osl(osl_get_object(dir_table, row, DT_NAME, &obj));
-	if (ret < 0)
-		goto out;
-	if (result) {
-		tmp = make_message("%s/%s", (char *)obj.data, result);
-		free(result);
-		result = tmp;
-	} else
-		result = adu_strdup((char *)obj.data);
-	ret = osl(osl_get_object(dir_table, row, DT_PARENT_NUM, &obj));
-	if (ret < 0)
-		goto out;
-	val = *(uint64_t *)obj.data;
-	if (val)
-		goto again;
-out:
-	if (ret < 0) {
-		free(result);
-		*name = NULL;
-	} else
-		*name = result;
-	return ret;
-}
-
-static int get_dir_name_of_row(struct osl_row *dir_table_row, char **name)
-{
-	struct osl_object obj;
-	int ret;
-	char *this_dir, *prefix = NULL;
-
-	*name = NULL;
-	ret = osl(osl_get_object(dir_table, dir_table_row, DT_NAME, &obj));
-	if (ret < 0)
-		return ret;
-	this_dir = adu_strdup((char *)obj.data);
-	ret = osl(osl_get_object(dir_table, dir_table_row, DT_PARENT_NUM, &obj));
-	if (ret < 0)
-		goto out;
-	if (!*(uint64_t *)obj.data) {
-		*name = this_dir;
-		return 1;
-	}
-	ret = get_dir_name_by_number((uint64_t *)obj.data, &prefix);
-	if (ret < 0)
-		goto out;
-	*name = make_message("%s/%s", prefix, this_dir);
-	free(prefix);
-	ret = 1;
-out:
-	free(this_dir);
-	return ret;
-}
-
-const uint64_t size_unit_divisors[] = {
-	[size_unit_arg_b] = 1ULL,
-	[size_unit_arg_k] = 1024ULL,
-	[size_unit_arg_m] = 1024ULL * 1024ULL,
-	[size_unit_arg_g] = 1024ULL * 1024ULL * 1024ULL,
-	[size_unit_arg_t] = 1024ULL * 1024ULL * 1024ULL * 1024ULL,
-};
-
-const uint64_t count_unit_divisors[] = {
-
-	[count_unit_arg_n] = 1ULL,
-	[count_unit_arg_k] = 1000ULL,
-	[count_unit_arg_m] = 1000ULL * 1000ULL,
-	[count_unit_arg_g] = 1000ULL * 1000ULL * 1000ULL,
-	[count_unit_arg_t] = 1000ULL * 1000ULL * 1000ULL * 1000ULL,
-};
-
-const char size_unit_abbrevs[] = " BKMGT";
-const char count_unit_abbrevs[] = "  kmgt";
-
-static enum enum_size_unit format_size_value(enum enum_size_unit unit,
-		uint64_t value, int print_unit, char *result)
-{
-	enum enum_size_unit u = unit;
-	char unit_buf[2] = "\0\0";
-
-	if (unit == size_unit_arg_h) /* human readable */
-		for (u = size_unit_arg_b; u < size_unit_arg_t &&
-				value > size_unit_divisors[u + 1]; u++)
-			; /* nothing */
-	if (print_unit)
-		unit_buf[0] = size_unit_abbrevs[u];
-	sprintf(result, "%llu%s",
-		(long long unsigned)value / size_unit_divisors[u], unit_buf);
-	return u;
-}
-
-static enum enum_count_unit format_count_value(enum enum_count_unit unit,
-		uint64_t value, int print_unit, char *result)
-{
-	enum enum_count_unit u = unit;
-	char unit_buf[2] = "\0\0";
-
-	if (unit == count_unit_arg_h) /* human readable */
-		for (u = count_unit_arg_n; u < count_unit_arg_t &&
-				value > count_unit_divisors[u + 1]; u++)
-			; /* nothing */
-	if (print_unit)
-		unit_buf[0] = count_unit_abbrevs[u];
-	sprintf(result, "%llu%s",
-		(long long unsigned)value / count_unit_divisors[u], unit_buf);
-	return u;
-}
-
-enum global_stats_flags {
-	GSF_PRINT_DIRNAME = 1,
-	GSF_PRINT_BYTES = 2,
-	GSF_PRINT_FILES = 4,
-	GSF_COMPUTE_SUMMARY = 8,
-};
-
-struct global_stats_info {
-	uint32_t count;
-	int ret;
-	int osl_errno;
-	enum global_stats_flags flags;
-};
-
-static int global_stats_loop_function(struct osl_row *row, void *data)
-{
-	struct global_stats_info *gsi = data;
-	struct osl_object obj;
-	char *dirname, formated_value[FORMATED_VALUE_SIZE];
-	int ret, summary = gsi->flags & GSF_COMPUTE_SUMMARY;
-
-	check_signals();
-	if (!gsi->count && !summary) {
-		ret = -E_LOOP_COMPLETE;
-		goto err;
-	}
-	if (summary || (gsi->count && (gsi->flags & GSF_PRINT_FILES))) {
-		uint64_t files;
-		ret = osl(osl_get_object(dir_table, row, DT_FILES, &obj));
-		if (ret < 0)
-			goto err;
-		files = *(uint64_t *)obj.data;
-		if (gsi->count && (gsi->flags & GSF_PRINT_FILES)) {
-			format_count_value(conf.count_unit_arg, files,
-				conf.count_unit_arg == count_unit_arg_h,
-				formated_value);
-			printf("\t%s%s", formated_value,
-				(gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_DIRNAME))?
-				"\t" : "\n");
-		}
-		if (summary)
-			num_files += files;
-	}
-	if (summary || (gsi->count && (gsi->flags & GSF_PRINT_BYTES))) {
-		uint64_t bytes;
-		ret = osl(osl_get_object(dir_table, row, DT_BYTES, &obj));
-		if (ret < 0)
-			goto err;
-		bytes = *(uint64_t *)obj.data;
-		if (gsi->count && (gsi->flags & GSF_PRINT_BYTES)) {
-			format_size_value(conf.size_unit_arg, bytes,
-				conf.size_unit_arg == size_unit_arg_h,
-				formated_value);
-			printf("%s%s%s",
-				(gsi->flags & GSF_PRINT_FILES)? "" : "\t",
-				formated_value,
-				(gsi->flags & GSF_PRINT_DIRNAME)? "\t" : "\n"
-			);
-		}
-		if (summary) {
-			num_bytes += bytes;
-			num_dirs++;
-		}
-	}
-	if (gsi->count && (gsi->flags & GSF_PRINT_DIRNAME)) {
-		ret = get_dir_name_of_row(row, &dirname);
-		if (ret < 0)
-			goto err;
-		printf("%s%s\n",
-			(gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_FILES))? "" : "\t",
-			dirname);
-		free(dirname);
-	}
-	if (gsi->count > 0)
-		gsi->count--;
-	return 1;
-err:
-	gsi->ret = ret;
-	gsi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
-	return -1;
-}
-
-static void print_id_stats(void)
-{
-	struct user_info *ui;
-
-	printf("User summary "
-		"(pw_name/uid/dirs%s/files%s/size%s):\n",
-		count_unit_buf, count_unit_buf, size_unit_buf);
-	FOR_EACH_USER(ui) {
-		char formated_dir_count[FORMATED_VALUE_SIZE],
-			formated_file_count[FORMATED_VALUE_SIZE],
-			formated_bytes[FORMATED_VALUE_SIZE ];
-		if (!ui_used(ui) || !ui_admissible(ui))
-			continue;
-		format_count_value(conf.count_unit_arg, ui->dirs,
-			conf.count_unit_arg == count_unit_arg_h,
-			formated_dir_count);
-		format_count_value(conf.count_unit_arg, ui->files,
-			conf.count_unit_arg == count_unit_arg_h,
-			formated_file_count);
-		format_size_value(conf.size_unit_arg, ui->bytes,
-			conf.size_unit_arg == size_unit_arg_h,
-			formated_bytes);
-		printf("\t%s\t%u\t%s\t%s\t%s\n",
-			ui->pw_name? ui->pw_name : "?",
-			(unsigned)ui->uid,
-			formated_dir_count,
-			formated_file_count,
-			formated_bytes
-		);
-	}
-}
-
-enum user_stats_flags {
-	USF_PRINT_DIRNAME = 1,
-	USF_PRINT_BYTES = 2,
-	USF_PRINT_FILES = 4,
-	USF_COMPUTE_SUMMARY = 8,
-};
-
-struct user_stats_info {
-	uint32_t count;
-	enum user_stats_flags flags;
-	int ret;
-	int osl_errno;
-	struct user_info *ui;
-};
-
-static int user_stats_loop_function(struct osl_row *row, void *data)
-{
-	struct user_stats_info *usi = data;
-	struct osl_object obj;
-	int ret, summary = usi->flags & GSF_COMPUTE_SUMMARY;
-	char formated_value[FORMATED_VALUE_SIZE];
-
-	check_signals();
-	if (!usi->count && !summary) {
-		ret = -E_LOOP_COMPLETE;
-		goto err;
-	}
-	if (summary || (usi->count && (usi->flags & USF_PRINT_FILES))) {
-		uint64_t files;
-		ret = osl(osl_get_object(usi->ui->table, row, UT_FILES, &obj));
-		if (ret < 0)
-			goto err;
-		files = *(uint64_t *)obj.data;
-		if (usi->count && (usi->flags & USF_PRINT_FILES)) {
-			format_count_value(conf.count_unit_arg, files,
-				conf.count_unit_arg == count_unit_arg_h,
-				formated_value);
-			printf("\t%s%s", formated_value,
-				(usi->flags & (USF_PRINT_BYTES | USF_PRINT_DIRNAME))?
-					"\t" : "\n"
-			);
-		}
-		if (summary)
-			usi->ui->files += files;
-	}
-	if (summary || (usi->count && (usi->flags & USF_PRINT_BYTES))) {
-		uint64_t bytes;
-		ret = osl(osl_get_object(usi->ui->table, row, UT_BYTES, &obj));
-		if (ret < 0)
-			goto err;
-		bytes = *(uint64_t *)obj.data;
-		if (usi->count && (usi->flags & USF_PRINT_BYTES)) {
-			format_size_value(conf.size_unit_arg, bytes,
-				conf.size_unit_arg == size_unit_arg_h,
-				formated_value);
-			printf("%s%s%s",
-				(usi->flags & USF_PRINT_FILES)? "" : "\t",
-				formated_value,
-				usi->flags & USF_PRINT_DIRNAME?  "\t" : "\n"
-			);
-		}
-		if (summary) {
-			usi->ui->bytes += bytes;
-			usi->ui->dirs++;
-		}
-
-	}
-	if (usi->count && (usi->flags & USF_PRINT_DIRNAME)) {
-		char *dirname;
-		ret = osl(osl_get_object(usi->ui->table, row, UT_DIR_NUM, &obj));
-		if (ret < 0)
-			goto err;
-		ret = get_dir_name_by_number((uint64_t *)obj.data, &dirname);
-		if (ret < 0)
-			goto err;
-		printf("%s%s\n",
-			(usi->flags & (USF_PRINT_BYTES | USF_PRINT_FILES))? "" : "\t",
-			dirname);
-		free(dirname);
-	}
-	if (usi->count > 0)
-		usi->count--;
-	return 1;
-err:
-	usi->ret = ret;
-	usi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
-	return -1;
-}
-
-static int check_loop_return(int ret, int loop_ret, int loop_osl_errno)
-{
-	if (ret >= 0)
-		return ret;
-	assert(ret == -E_OSL);
-	if (osl_errno != E_OSL_LOOP)
-		/* error not caused by loop function returning negative. */
-		return ret;
-	assert(loop_ret < 0);
-	if (loop_ret == -E_LOOP_COMPLETE) /* no error */
-		return 1;
-	if (loop_ret == -E_OSL) { /* osl error in loop function */
-		assert(loop_osl_errno);
-		osl_errno = loop_osl_errno;
-	}
-	return loop_ret;
-}
-
-static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private_data,
-		osl_rbtree_loop_func *func, int *loop_ret, int *loop_osl_errno)
-{
-	int ret = osl(osl_rbtree_loop_reverse(t, col_num, private_data, func));
-	return check_loop_return(ret, *loop_ret, *loop_osl_errno);
-}
-
-static int print_user_stats(void)
-{
-	struct user_info *ui;
-	int ret;
-
-	FOR_EACH_USER(ui) {
-		struct user_stats_info usi = {
-			.count = conf.limit_arg,
-			.ui = ui
-		};
-		if (!ui_used(ui) || !ui_admissible(ui))
-			continue;
-		usi.flags = USF_PRINT_DIRNAME | USF_PRINT_BYTES | USF_COMPUTE_SUMMARY;
-		printf("%s (uid %u), by size%s:\n",
-			ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
-			size_unit_buf);
-		ret = adu_loop_reverse(ui->table, UT_BYTES, &usi, user_stats_loop_function,
-			&usi.ret, &usi.osl_errno);
-		if (ret < 0)
-			return ret;
-		printf("\n%s (uid %u), by file count%s:\n",
-			ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
-			count_unit_buf);
-		usi.count = conf.limit_arg,
-		usi.flags = USF_PRINT_DIRNAME | USF_PRINT_FILES;
-		ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
-			&usi.ret, &usi.osl_errno);
-		if (ret < 0)
-			return ret;
-		printf("\n");
-	}
-	return 1;
-}
-
-static void print_global_summary(void)
-{
-	char d[FORMATED_VALUE_SIZE], f[FORMATED_VALUE_SIZE],
-		s[FORMATED_VALUE_SIZE];
-	enum enum_count_unit ud, uf;
-	enum enum_size_unit us;
-
-	ud = format_count_value(conf.count_unit_arg, num_dirs, 0, d);
-	uf = format_count_value(conf.count_unit_arg, num_files, 0, f);
-	us = format_size_value(conf.size_unit_arg, num_bytes, 0, s);
-
-	printf("Global summary "
-		"(dirs(%c)/files(%c)/size(%c))\n"
-		"\t%s\t%s\t%s\n\n",
-		count_unit_abbrevs[ud],
-		count_unit_abbrevs[uf],
-		size_unit_abbrevs[us],
-		d, f, s
-	);
-
-}
-
-static int print_statistics(void)
-{
-	int ret;
-	struct global_stats_info gsi = {
-		.count = conf.limit_arg,
-		.flags = GSF_PRINT_DIRNAME | GSF_PRINT_BYTES | GSF_COMPUTE_SUMMARY
-	};
-
-	printf("By size%s:\n",
-		size_unit_buf);
-	ret = adu_loop_reverse(dir_table, DT_BYTES, &gsi,
-		global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
-	if (ret < 0)
-		return ret;
-	printf("\n");
-
-	gsi.count = conf.limit_arg;
-	gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_FILES;
-	printf("By file count%s:\n",
-		count_unit_buf);
-	ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
-		global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
-	if (ret < 0)
-		return ret;
-	printf("\n");
-	print_global_summary();
-	print_user_stats();
-	print_id_stats();
-	return 1;
-}
-
-static char *get_uid_list_name(void)
+char *get_uid_list_name(void)
 {
 	return make_message("%s/uid_list", conf.database_dir_arg);
 }
@@ -1123,7 +624,7 @@ static int write_uid_list(void)
 	return ret;
 }
 
-static int open_dir_table(void)
+int open_dir_table(void)
 {
 	if (!dir_table_desc.dir) /* we did not create the table */
 		dir_table_desc.dir = adu_strdup(conf.database_dir_arg);
@@ -1157,63 +658,6 @@ out:
 	return ret;
 }
 
-static int read_uid_file(void)
-{
-	size_t size;
-	uint32_t n;
-	char *filename = get_uid_list_name(), *map;
-	int ret = mmap_full_file(filename, O_RDONLY, (void **)&map, &size, NULL);
-
-	if (ret < 0) {
-		INFO_LOG("failed to map %s\n", filename);
-		free(filename);
-		return ret;
-	}
-	num_uids = size / 4;
-	INFO_LOG("found %u uids in %s\n", (unsigned)num_uids, filename);
-	free(filename);
-	/* hash table size should be a power of two and larger than the number of uids */
-	uid_hash_table_size = 4;
-	while (uid_hash_table_size < num_uids)
-		uid_hash_table_size *= 2;
-	create_hash_table();
-	for (n = 0; n < num_uids; n++) {
-		uint32_t uid = read_u32(map + n * sizeof(uid));
-		ret = search_uid(uid, OPEN_USER_TABLE, NULL);
-		if (ret < 0)
-			goto out;
-	}
-out:
-	adu_munmap(map, size);
-	return ret;
-}
-
-static int com_select(void)
-{
-	int ret;
-
-	if (conf.count_unit_arg != count_unit_arg_h)
-		count_unit_buf[1] = count_unit_abbrevs[conf.count_unit_arg];
-	else
-		count_unit_buf[0] = '\0';
-	if (conf.size_unit_arg != size_unit_arg_h)
-		size_unit_buf[1] = size_unit_abbrevs[conf.size_unit_arg];
-	else
-		size_unit_buf[0] = '\0';
-
-	ret = open_dir_table();
-	if (ret < 0)
-		return ret;
-	check_signals();
-	ret = read_uid_file();
-	if (ret < 0)
-		return ret;
-	check_signals();
-	ret = print_statistics();
-	close_all_tables();
-	return ret;
-}
-
 static int check_args(void)
 {
 	int i, ret;
diff --git a/adu.h b/adu.h
index 775af7f..69488a4 100644
--- a/adu.h
+++ b/adu.h
@@ -4,7 +4,7 @@
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file para.h global paraslash definitions */
+/** \file adu.h Global definitions. */
 
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -26,13 +26,6 @@
 #include <osl.h>
 #include "gcc-compat.h"
 
-/** compute the minimum of \a a and \a b */
-#define MIN(a,b) ((a) < (b) ? (a) : (b))
-/** compute the maximum of \a a and \a b */
-#define MAX(a,b) ((a) > (b) ? (a) : (b))
-/** compute the absolute value of \a a */
-#define ABS(a) ((a) > 0 ? (a) : -(a))
-
 /** debug loglevel, gets really noisy */
 #define DEBUG 1
 /** still noisy, but won't fill your disk */
@@ -94,7 +87,6 @@
 #define EMERG_LOG(...)
 #endif
 /** \endcond */
-__printf_2_3 void __log(int, const char*, ...);
 
 /**
  * Write a log message to a dynamically allocated string.
@@ -125,3 +117,94 @@ __printf_2_3 void __log(int, const char*, ...);
 		p = adu_realloc(p, size); \
 	} \
 }
+
+#define FOR_EACH_USER(ui) for (ui = uid_hash_table; ui && ui < uid_hash_table \
+		+ uid_hash_table_size; ui++)
+
+/** The columns of the directory table. */
+enum dir_table_columns {
+	/** The name of the directory. */
+	DT_NAME,
+	/** The dir count number. */
+	DT_NUM,
+	/** The number of the parent directory. */
+	DT_PARENT_NUM,
+	/** The number of bytes of all regular files. */
+	DT_BYTES,
+	/** The number of all regular files. */
+	DT_FILES,
+	/** Number of columns in this table. */
+	NUM_DT_COLUMNS
+};
+
+/** The columns of the id table. */
+enum user_table_columns {
+	/** The numer of the directory. */
+	UT_DIR_NUM,
+	/** The number of bytes of all regular files in this dir owned by this id. */
+	UT_BYTES,
+	/** The number of files in this dir owned by this id. */
+	UT_FILES,
+	/** Number of columns in this table. */
+	NUM_UT_COLUMNS
+};
+
+enum uid_info_flags {
+	/** Whether this slot of the hash table is used. */
+	UI_FL_SLOT_USED = 1,
+	/** Whether this uid should be taken into account. */
+	UI_FL_ADMISSIBLE = 2,
+};
+
+struct user_info {
+	uint32_t uid;
+	uint32_t flags;
+	char *pw_name;
+	struct osl_table *table;
+	uint64_t files;
+	uint64_t bytes;
+	uint64_t dirs;
+	struct osl_table_description *desc;
+};
+
+struct uid_range {
+	uint32_t low;
+	uint32_t high;
+};
+
+enum search_uid_flags {
+	OPEN_USER_TABLE = 1,
+	CREATE_USER_TABLE = 2,
+};
+
+extern uint32_t num_uids;
+extern uint32_t uid_hash_table_size;
+extern struct osl_table *dir_table;
+extern struct user_info *uid_hash_table;
+extern uint64_t num_dirs;
+extern uint64_t num_files;
+extern uint64_t num_bytes;
+extern struct gengetopt_args_info conf;
+
+/* adu.c */
+__printf_2_3 void __log(int, const char*, ...);
+int open_dir_table(void);
+void check_signals(void);
+void close_all_tables(void);
+char *get_uid_list_name(void);
+void create_hash_table(void);
+int search_uid(uint32_t uid, enum search_uid_flags flags,
+		struct user_info **ui_ptr);
+
+/* select.c */
+int com_select(void);
+
+static inline int ui_used(struct user_info *ui)
+{
+	return ui->flags & UI_FL_SLOT_USED;
+}
+
+static inline int ui_admissible(struct user_info *ui)
+{
+	return ui->flags & UI_FL_ADMISSIBLE;
+}
diff --git a/select.c b/select.c
new file mode 100644
index 0000000..b394676
--- /dev/null
+++ b/select.c
@@ -0,0 +1,512 @@
+/*
+ * Copyright (C) 2008 Andre Noll <maan@systemlinux.org>
+ *
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+
+/** \file select.c The select mode of adu. */
+
+#include <dirent.h> /* readdir() */
+#include "adu.h"
+#include "gcc-compat.h"
+#include "cmdline.h"
+#include "fd.h"
+#include "string.h"
+#include "error.h"
+#include "portable_io.h"
+
+/** The decimal representation of an uint64_t never exceeds that size. */
+#define FORMATED_VALUE_SIZE 25
+
+/* these get filled in by the select command. */
+static char count_unit_buf[4] = "( )", size_unit_buf[4] = "( )";
+
+enum global_stats_flags {
+	GSF_PRINT_DIRNAME = 1,
+	GSF_PRINT_BYTES = 2,
+	GSF_PRINT_FILES = 4,
+	GSF_COMPUTE_SUMMARY = 8,
+};
+
+struct global_stats_info {
+	uint32_t count;
+	int ret;
+	int osl_errno;
+	enum global_stats_flags flags;
+};
+
+enum user_stats_flags {
+	USF_PRINT_DIRNAME = 1,
+	USF_PRINT_BYTES = 2,
+	USF_PRINT_FILES = 4,
+	USF_COMPUTE_SUMMARY = 8,
+};
+
+struct user_stats_info {
+	uint32_t count;
+	enum user_stats_flags flags;
+	int ret;
+	int osl_errno;
+	struct user_info *ui;
+};
+
+static const uint64_t size_unit_divisors[] = {
+	[size_unit_arg_b] = 1ULL,
+	[size_unit_arg_k] = 1024ULL,
+	[size_unit_arg_m] = 1024ULL * 1024ULL,
+	[size_unit_arg_g] = 1024ULL * 1024ULL * 1024ULL,
+	[size_unit_arg_t] = 1024ULL * 1024ULL * 1024ULL * 1024ULL,
+};
+
+static const uint64_t count_unit_divisors[] = {
+
+	[count_unit_arg_n] = 1ULL,
+	[count_unit_arg_k] = 1000ULL,
+	[count_unit_arg_m] = 1000ULL * 1000ULL,
+	[count_unit_arg_g] = 1000ULL * 1000ULL * 1000ULL,
+	[count_unit_arg_t] = 1000ULL * 1000ULL * 1000ULL * 1000ULL,
+};
+
+static const char size_unit_abbrevs[] = " BKMGT";
+static const char count_unit_abbrevs[] = "  kmgt";
+
+static enum enum_size_unit format_size_value(enum enum_size_unit unit,
+		uint64_t value, int print_unit, char *result)
+{
+	enum enum_size_unit u = unit;
+	char unit_buf[2] = "\0\0";
+
+	if (unit == size_unit_arg_h) /* human readable */
+		for (u = size_unit_arg_b; u < size_unit_arg_t &&
+				value > size_unit_divisors[u + 1]; u++)
+			; /* nothing */
+	if (print_unit)
+		unit_buf[0] = size_unit_abbrevs[u];
+	sprintf(result, "%llu%s",
+		(long long unsigned)value / size_unit_divisors[u], unit_buf);
+	return u;
+}
+
+static enum enum_count_unit format_count_value(enum enum_count_unit unit,
+		uint64_t value, int print_unit, char *result)
+{
+	enum enum_count_unit u = unit;
+	char unit_buf[2] = "\0\0";
+
+	if (unit == count_unit_arg_h) /* human readable */
+		for (u = count_unit_arg_n; u < count_unit_arg_t &&
+				value > count_unit_divisors[u + 1]; u++)
+			; /* nothing */
+	if (print_unit)
+		unit_buf[0] = count_unit_abbrevs[u];
+	sprintf(result, "%llu%s",
+		(long long unsigned)value / count_unit_divisors[u], unit_buf);
+	return u;
+}
+
+static int get_dir_name_by_number(uint64_t *dirnum, char **name)
+{
+	char *result = NULL, *tmp;
+	struct osl_row *row;
+	uint64_t val = *dirnum;
+	struct osl_object obj = {.data = &val, .size = sizeof(val)};
+	int ret;
+
+again:
+	ret = osl(osl_get_row(dir_table, DT_NUM, &obj, &row));
+	if (ret < 0)
+		goto out;
+	ret = osl(osl_get_object(dir_table, row, DT_NAME, &obj));
+	if (ret < 0)
+		goto out;
+	if (result) {
+		tmp = make_message("%s/%s", (char *)obj.data, result);
+		free(result);
+		result = tmp;
+	} else
+		result = adu_strdup((char *)obj.data);
+	ret = osl(osl_get_object(dir_table, row, DT_PARENT_NUM, &obj));
+	if (ret < 0)
+		goto out;
+	val = *(uint64_t *)obj.data;
+	if (val)
+		goto again;
+out:
+	if (ret < 0) {
+		free(result);
+		*name = NULL;
+	} else
+		*name = result;
+	return ret;
+}
+
+static int get_dir_name_of_row(struct osl_row *dir_table_row, char **name)
+{
+	struct osl_object obj;
+	int ret;
+	char *this_dir, *prefix = NULL;
+
+	*name = NULL;
+	ret = osl(osl_get_object(dir_table, dir_table_row, DT_NAME, &obj));
+	if (ret < 0)
+		return ret;
+	this_dir = adu_strdup((char *)obj.data);
+	ret = osl(osl_get_object(dir_table, dir_table_row, DT_PARENT_NUM, &obj));
+	if (ret < 0)
+		goto out;
+	if (!*(uint64_t *)obj.data) {
+		*name = this_dir;
+		return 1;
+	}
+	ret = get_dir_name_by_number((uint64_t *)obj.data, &prefix);
+	if (ret < 0)
+		goto out;
+	*name = make_message("%s/%s", prefix, this_dir);
+	free(prefix);
+	ret = 1;
+out:
+	free(this_dir);
+	return ret;
+}
+static int user_stats_loop_function(struct osl_row *row, void *data)
+{
+	struct user_stats_info *usi = data;
+	struct osl_object obj;
+	int ret, summary = usi->flags & GSF_COMPUTE_SUMMARY;
+	char formated_value[FORMATED_VALUE_SIZE];
+
+	check_signals();
+	if (!usi->count && !summary) {
+		ret = -E_LOOP_COMPLETE;
+		goto err;
+	}
+	if (summary || (usi->count && (usi->flags & USF_PRINT_FILES))) {
+		uint64_t files;
+		ret = osl(osl_get_object(usi->ui->table, row, UT_FILES, &obj));
+		if (ret < 0)
+			goto err;
+		files = *(uint64_t *)obj.data;
+		if (usi->count && (usi->flags & USF_PRINT_FILES)) {
+			format_count_value(conf.count_unit_arg, files,
+				conf.count_unit_arg == count_unit_arg_h,
+				formated_value);
+			printf("\t%s%s", formated_value,
+				(usi->flags & (USF_PRINT_BYTES | USF_PRINT_DIRNAME))?
+					"\t" : "\n"
+			);
+		}
+		if (summary)
+			usi->ui->files += files;
+	}
+	if (summary || (usi->count && (usi->flags & USF_PRINT_BYTES))) {
+		uint64_t bytes;
+		ret = osl(osl_get_object(usi->ui->table, row, UT_BYTES, &obj));
+		if (ret < 0)
+			goto err;
+		bytes = *(uint64_t *)obj.data;
+		if (usi->count && (usi->flags & USF_PRINT_BYTES)) {
+			format_size_value(conf.size_unit_arg, bytes,
+				conf.size_unit_arg == size_unit_arg_h,
+				formated_value);
+			printf("%s%s%s",
+				(usi->flags & USF_PRINT_FILES)? "" : "\t",
+				formated_value,
+				usi->flags & USF_PRINT_DIRNAME?  "\t" : "\n"
+			);
+		}
+		if (summary) {
+			usi->ui->bytes += bytes;
+			usi->ui->dirs++;
+		}
+
+	}
+	if (usi->count && (usi->flags & USF_PRINT_DIRNAME)) {
+		char *dirname;
+		ret = osl(osl_get_object(usi->ui->table, row, UT_DIR_NUM, &obj));
+		if (ret < 0)
+			goto err;
+		ret = get_dir_name_by_number((uint64_t *)obj.data, &dirname);
+		if (ret < 0)
+			goto err;
+		printf("%s%s\n",
+			(usi->flags & (USF_PRINT_BYTES | USF_PRINT_FILES))? "" : "\t",
+			dirname);
+		free(dirname);
+	}
+	if (usi->count > 0)
+		usi->count--;
+	return 1;
+err:
+	usi->ret = ret;
+	usi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return -1;
+}
+
+static int global_stats_loop_function(struct osl_row *row, void *data)
+{
+	struct global_stats_info *gsi = data;
+	struct osl_object obj;
+	char *dirname, formated_value[FORMATED_VALUE_SIZE];
+	int ret, summary = gsi->flags & GSF_COMPUTE_SUMMARY;
+
+	check_signals();
+	if (!gsi->count && !summary) {
+		ret = -E_LOOP_COMPLETE;
+		goto err;
+	}
+	if (summary || (gsi->count && (gsi->flags & GSF_PRINT_FILES))) {
+		uint64_t files;
+		ret = osl(osl_get_object(dir_table, row, DT_FILES, &obj));
+		if (ret < 0)
+			goto err;
+		files = *(uint64_t *)obj.data;
+		if (gsi->count && (gsi->flags & GSF_PRINT_FILES)) {
+			format_count_value(conf.count_unit_arg, files,
+				conf.count_unit_arg == count_unit_arg_h,
+				formated_value);
+			printf("\t%s%s", formated_value,
+				(gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_DIRNAME))?
+				"\t" : "\n");
+		}
+		if (summary)
+			num_files += files;
+	}
+	if (summary || (gsi->count && (gsi->flags & GSF_PRINT_BYTES))) {
+		uint64_t bytes;
+		ret = osl(osl_get_object(dir_table, row, DT_BYTES, &obj));
+		if (ret < 0)
+			goto err;
+		bytes = *(uint64_t *)obj.data;
+		if (gsi->count && (gsi->flags & GSF_PRINT_BYTES)) {
+			format_size_value(conf.size_unit_arg, bytes,
+				conf.size_unit_arg == size_unit_arg_h,
+				formated_value);
+			printf("%s%s%s",
+				(gsi->flags & GSF_PRINT_FILES)? "" : "\t",
+				formated_value,
+				(gsi->flags & GSF_PRINT_DIRNAME)? "\t" : "\n"
+			);
+		}
+		if (summary) {
+			num_bytes += bytes;
+			num_dirs++;
+		}
+	}
+	if (gsi->count && (gsi->flags & GSF_PRINT_DIRNAME)) {
+		ret = get_dir_name_of_row(row, &dirname);
+		if (ret < 0)
+			goto err;
+		printf("%s%s\n",
+			(gsi->flags & (GSF_PRINT_BYTES | GSF_PRINT_FILES))? "" : "\t",
+			dirname);
+		free(dirname);
+	}
+	if (gsi->count > 0)
+		gsi->count--;
+	return 1;
+err:
+	gsi->ret = ret;
+	gsi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return -1;
+}
+
+static int check_loop_return(int ret, int loop_ret, int loop_osl_errno)
+{
+	if (ret >= 0)
+		return ret;
+	assert(ret == -E_OSL);
+	if (osl_errno != E_OSL_LOOP)
+		/* error not caused by loop function returning negative. */
+		return ret;
+	assert(loop_ret < 0);
+	if (loop_ret == -E_LOOP_COMPLETE) /* no error */
+		return 1;
+	if (loop_ret == -E_OSL) { /* osl error in loop function */
+		assert(loop_osl_errno);
+		osl_errno = loop_osl_errno;
+	}
+	return loop_ret;
+}
+
+static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private_data,
+		osl_rbtree_loop_func *func, int *loop_ret, int *loop_osl_errno)
+{
+	int ret = osl(osl_rbtree_loop_reverse(t, col_num, private_data, func));
+	return check_loop_return(ret, *loop_ret, *loop_osl_errno);
+}
+
+static void print_global_summary(void)
+{
+	char d[FORMATED_VALUE_SIZE], f[FORMATED_VALUE_SIZE],
+		s[FORMATED_VALUE_SIZE];
+	enum enum_count_unit ud, uf;
+	enum enum_size_unit us;
+
+	ud = format_count_value(conf.count_unit_arg, num_dirs, 0, d);
+	uf = format_count_value(conf.count_unit_arg, num_files, 0, f);
+	us = format_size_value(conf.size_unit_arg, num_bytes, 0, s);
+
+	printf("Global summary "
+		"(dirs(%c)/files(%c)/size(%c))\n"
+		"\t%s\t%s\t%s\n\n",
+		count_unit_abbrevs[ud],
+		count_unit_abbrevs[uf],
+		size_unit_abbrevs[us],
+		d, f, s
+	);
+
+}
+
+static void print_id_stats(void)
+{
+	struct user_info *ui;
+
+	printf("User summary "
+		"(pw_name/uid/dirs%s/files%s/size%s):\n",
+		count_unit_buf, count_unit_buf, size_unit_buf);
+	FOR_EACH_USER(ui) {
+		char formated_dir_count[FORMATED_VALUE_SIZE],
+			formated_file_count[FORMATED_VALUE_SIZE],
+			formated_bytes[FORMATED_VALUE_SIZE ];
+		if (!ui_used(ui) || !ui_admissible(ui))
+			continue;
+		format_count_value(conf.count_unit_arg, ui->dirs,
+			conf.count_unit_arg == count_unit_arg_h,
+			formated_dir_count);
+		format_count_value(conf.count_unit_arg, ui->files,
+			conf.count_unit_arg == count_unit_arg_h,
+			formated_file_count);
+		format_size_value(conf.size_unit_arg, ui->bytes,
+			conf.size_unit_arg == size_unit_arg_h,
+			formated_bytes);
+		printf("\t%s\t%u\t%s\t%s\t%s\n",
+			ui->pw_name? ui->pw_name : "?",
+			(unsigned)ui->uid,
+			formated_dir_count,
+			formated_file_count,
+			formated_bytes
+		);
+	}
+}
+
+static int print_user_stats(void)
+{
+	struct user_info *ui;
+	int ret;
+
+	FOR_EACH_USER(ui) {
+		struct user_stats_info usi = {
+			.count = conf.limit_arg,
+			.ui = ui
+		};
+		if (!ui_used(ui) || !ui_admissible(ui))
+			continue;
+		usi.flags = USF_PRINT_DIRNAME | USF_PRINT_BYTES | USF_COMPUTE_SUMMARY;
+		printf("%s (uid %u), by size%s:\n",
+			ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
+			size_unit_buf);
+		ret = adu_loop_reverse(ui->table, UT_BYTES, &usi, user_stats_loop_function,
+			&usi.ret, &usi.osl_errno);
+		if (ret < 0)
+			return ret;
+		printf("\n%s (uid %u), by file count%s:\n",
+			ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
+			count_unit_buf);
+		usi.count = conf.limit_arg,
+		usi.flags = USF_PRINT_DIRNAME | USF_PRINT_FILES;
+		ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
+			&usi.ret, &usi.osl_errno);
+		if (ret < 0)
+			return ret;
+		printf("\n");
+	}
+	return 1;
+}
+
+static int print_statistics(void)
+{
+	int ret;
+	struct global_stats_info gsi = {
+		.count = conf.limit_arg,
+		.flags = GSF_PRINT_DIRNAME | GSF_PRINT_BYTES | GSF_COMPUTE_SUMMARY
+	};
+
+	printf("By size%s:\n",
+		size_unit_buf);
+	ret = adu_loop_reverse(dir_table, DT_BYTES, &gsi,
+		global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
+	if (ret < 0)
+		return ret;
+	printf("\n");
+
+	gsi.count = conf.limit_arg;
+	gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_FILES;
+	printf("By file count%s:\n",
+		count_unit_buf);
+	ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
+		global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
+	if (ret < 0)
+		return ret;
+	printf("\n");
+	print_global_summary();
+	print_user_stats();
+	print_id_stats();
+	return 1;
+}
+
+static int read_uid_file(void)
+{
+	size_t size;
+	uint32_t n;
+	char *filename = get_uid_list_name(), *map;
+	int ret = mmap_full_file(filename, O_RDONLY, (void **)&map, &size, NULL);
+
+	if (ret < 0) {
+		INFO_LOG("failed to map %s\n", filename);
+		free(filename);
+		return ret;
+	}
+	num_uids = size / 4;
+	INFO_LOG("found %u uids in %s\n", (unsigned)num_uids, filename);
+	free(filename);
+	/* hash table size should be a power of two and larger than the number of uids */
+	uid_hash_table_size = 4;
+	while (uid_hash_table_size < num_uids)
+		uid_hash_table_size *= 2;
+	create_hash_table();
+	for (n = 0; n < num_uids; n++) {
+		uint32_t uid = read_u32(map + n * sizeof(uid));
+		ret = search_uid(uid, OPEN_USER_TABLE, NULL);
+		if (ret < 0)
+			goto out;
+	}
+out:
+	adu_munmap(map, size);
+	return ret;
+}
+
+int com_select(void)
+{
+	int ret;
+
+	if (conf.count_unit_arg != count_unit_arg_h)
+		count_unit_buf[1] = count_unit_abbrevs[conf.count_unit_arg];
+	else
+		count_unit_buf[0] = '\0';
+	if (conf.size_unit_arg != size_unit_arg_h)
+		size_unit_buf[1] = size_unit_abbrevs[conf.size_unit_arg];
+	else
+		size_unit_buf[0] = '\0';
+
+	ret = open_dir_table();
+	if (ret < 0)
+		return ret;
+	check_signals();
+	ret = read_uid_file();
+	if (ret < 0)
+		return ret;
+	check_signals();
+	ret = print_statistics();
+	close_all_tables();
+	return ret;
+}