X-Git-Url: http://git.tuebingen.mpg.de/?p=adu.git;a=blobdiff_plain;f=select.c;h=6ef289152c42a77f6f14acb8042bcd345463b5f2;hp=e3d97b11ef7893f09ba89008aa1994b30318fc39;hb=59af25aafd51b706ed67784aa84332965c31bb26;hpb=0144f2253169466ca4c8b2434dca070aa14e491a

diff --git a/select.c b/select.c
index e3d97b1..6ef2891 100644
--- a/select.c
+++ b/select.c
@@ -4,111 +4,178 @@
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
-/** \file select.c The select mode of adu. */
+/** \file select.c \brief The select mode of adu. */
 
 #include <dirent.h> /* readdir() */
+#include <sys/types.h>
+#include <regex.h>
+
+#include "format.h"
 #include "adu.h"
 #include "gcc-compat.h"
 #include "cmdline.h"
 #include "fd.h"
 #include "string.h"
 #include "error.h"
-#include "portable_io.h"
+#include "user.h"
 #include "select.cmdline.h"
 
-/** Global dir count. */
-static uint64_t num_dirs;
-/** Global files count. */
-static uint64_t num_files;
-/** Global bytes count. */
-static uint64_t num_bytes;
+/** \cond */
+/* global list */
+#define GLOBAL_LIST_ATOMS \
+	ATOM(size, SIZE) \
+	ATOM(files, COUNT) \
+	ATOM(dirname, STRING) \
+
+#define ATOM(x, y) { .name = #x, .type = AT_ ## y},
+struct atom global_list_atoms[] = {
+	GLOBAL_LIST_ATOMS
+	{.name = NULL}
+};
+#undef ATOM
+#define ATOM(x, y) gla_ ## x,
+enum global_list_atoms {GLOBAL_LIST_ATOMS};
+#undef ATOM
+
+/* global summary */
+#define GLOBAL_SUMMARY_ATOMS \
+	ATOM(dirs, COUNT) \
+	ATOM(files, COUNT) \
+	ATOM(size, SIZE)
+
+#define ATOM(x, y) { .name = #x, .type = AT_ ## y},
+struct atom global_summary_atoms[] = {
+	GLOBAL_SUMMARY_ATOMS
+	{.name = NULL}
+};
+#undef ATOM
+#define ATOM(x, y) gsa_ ## x,
+enum global_summary_atoms {GLOBAL_SUMMARY_ATOMS};
+#undef ATOM
+
+/* user list */
+#define USER_LIST_ATOMS \
+	ATOM(pw_name, STRING) \
+	ATOM(uid, ID) \
+	ATOM(size, SIZE) \
+	ATOM(files, COUNT) \
+	ATOM(dirname, STRING) \
+
+#define ATOM(x, y) { .name = #x, .type = AT_ ## y},
+struct atom user_list_atoms[] = {
+	USER_LIST_ATOMS
+	{.name = NULL}
+};
+#undef ATOM
+#define ATOM(x, y) ula_ ## x,
+enum user_list_atoms {USER_LIST_ATOMS};
+#undef ATOM
+
+/* user list header */
+#define USER_LIST_HEADER_TRAILER_ATOMS \
+	ATOM(pw_name, STRING) \
+	ATOM(uid, ID)
 
-/** The decimal representation of an uint64_t never exceeds that size. */
-#define FORMATED_VALUE_SIZE 25
+#define ATOM(x, y) { .name = #x, .type = AT_ ## y},
+struct atom user_list_header_trailer_atoms[] = {
+	USER_LIST_HEADER_TRAILER_ATOMS
+	{.name = NULL}
+};
+#undef ATOM
+#define ATOM(x, y) ulha_ ## x,
+enum user_list_header_trailer_atoms {USER_LIST_HEADER_TRAILER_ATOMS};
+#undef ATOM
 
-/* these get filled in by the select command. */
-static char count_unit_buf[4] = "( )", size_unit_buf[4] = "( )";
+/* user summary */
+#define USER_SUMMARY_ATOMS \
+	ATOM(pw_name, STRING) \
+	ATOM(uid, ID) \
+	ATOM(dirs, COUNT) \
+	ATOM(files, COUNT) \
+	ATOM(size, SIZE)
 
-enum global_stats_flags {
-	GSF_PRINT_DIRNAME = 1,
-	GSF_PRINT_BYTES = 2,
-	GSF_PRINT_FILES = 4,
-	GSF_COMPUTE_SUMMARY = 8,
+#define ATOM(x, y) { .name = #x, .type = AT_ ## y},
+struct atom user_summary_atoms[] = {
+	USER_SUMMARY_ATOMS
+	{.name = NULL}
 };
+#undef ATOM
+#define ATOM(x, y) usa_ ## x,
+enum user_summary_atoms {USER_SUMMARY_ATOMS};
+#undef ATOM
+
+/** \endcond */
 
-struct global_stats_info {
+struct global_list_info {
 	uint32_t count;
 	int ret;
 	int osl_errno;
-	enum global_stats_flags flags;
+	struct format_info *fi;
+	regex_t *preg;
+	int inverse_matching;
 };
 
-enum user_stats_flags {
-	USF_PRINT_DIRNAME = 1,
-	USF_PRINT_BYTES = 2,
-	USF_PRINT_FILES = 4,
-	USF_COMPUTE_SUMMARY = 8,
+struct global_summary_info {
+	/** Global dir count. */
+	uint64_t num_dirs;
+	/** Global files count. */
+	uint64_t num_files;
+	/** Global bytes count. */
+	uint64_t num_bytes;
+	regex_t *preg;
+	int inverse_matching;
+	int ret;
+	int osl_errno;
 };
 
-struct user_stats_info {
+struct user_list_info {
 	uint32_t count;
-	enum user_stats_flags flags;
+	struct user_info *ui;
+	struct format_info *fi;
+	regex_t *preg;
+	int inverse_matching;
 	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,
+struct user_list_format_info {
+	struct format_info *fi;
+	struct format_info *header_fi;
+	struct format_info *trailer_fi;
 };
 
-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,
+struct user_summary_info {
+	struct user_info *ui;
+	/** Total number of files owned by this user. */
+	uint64_t files;
+	/** Total number of bytes owned by this user. */
+	uint64_t bytes;
+	/** Total number of directories that contain at least one file */
+	uint64_t dirs;
+	int ret;
+	int osl_errno;
+	regex_t *preg;
+	int inverse_matching;
 };
 
-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";
+struct user_summary_loop_data {
+	unsigned num_admissible_users;
+	struct user_summary_info *usis;
+	struct user_summary_info *current;
+	struct format_info *fi;
+};
 
-	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 FILE *output_file;
 
-static enum enum_count_unit format_count_value(enum enum_count_unit unit,
-		uint64_t value, int print_unit, char *result)
+__printf_1_2 static int output(const char const *fmt, ...)
 {
-	enum enum_count_unit u = unit;
-	char unit_buf[2] = "\0\0";
+	va_list argp;
+	int ret;
 
-	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;
+	va_start(argp, fmt);
+	ret = vfprintf(output_file, fmt, argp);
+	va_end(argp);
+	return ret < 0? -E_OUTPUT : 1;
 }
 
 static int get_dir_name_by_number(uint64_t *dirnum, char **name)
@@ -162,146 +229,115 @@ static int get_dir_name_of_row(struct osl_row *dir_table_row, char **name)
 	return get_dir_name_by_number((uint64_t *)obj.data, name);
 }
 
-static int user_stats_loop_function(struct osl_row *row, void *data)
+static int get_dir_name_of_user_row(struct osl_row *user_table_row,
+		struct user_info *ui, char **dirname)
 {
-	struct user_stats_info *usi = data;
 	struct osl_object obj;
-	int ret, summary = usi->flags & GSF_COMPUTE_SUMMARY;
-	char formated_value[FORMATED_VALUE_SIZE];
+	int ret = osl(osl_get_object(ui->table, user_table_row,
+		UT_DIR_NUM, &obj));
 
-	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(select_conf.count_unit_arg, files,
-				select_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(select_conf.size_unit_arg, bytes,
-				select_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 (ret < 0)
+		return ret;
+	return get_dir_name_by_number((uint64_t *)obj.data, dirname);
+}
 
-	}
-	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--;
+static int get_num_files_of_row(struct osl_row *row, uint64_t *num_files)
+{
+	struct osl_object obj;
+	int ret = osl(osl_get_object(dir_table, row, DT_FILES, &obj));
+	if (ret < 0)
+		return ret;
+	*num_files = *(uint64_t *)obj.data;
 	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)
+static int get_num_user_files(struct osl_row *row, struct user_info *ui,
+		uint64_t *num_files)
 {
-	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;
+	int ret = osl(osl_get_object(ui->table, row, UT_FILES, &obj));
 
-	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(select_conf.count_unit_arg, files,
-				select_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 (ret < 0)
+		return ret;
+	*num_files = *(uint64_t *)obj.data;
+	return 1;
+}
+
+static int get_num_bytes_of_row(struct osl_row *row, uint64_t *num_bytes)
+{
+	struct osl_object obj;
+	int ret = osl(osl_get_object(dir_table, row, DT_BYTES, &obj));
+	if (ret < 0)
+		return ret;
+	*num_bytes = *(uint64_t *)obj.data;
+	return 1;
+}
+
+static int get_num_user_bytes(struct osl_row *row, struct user_info *ui,
+		uint64_t *num_bytes)
+{
+	struct osl_object obj;
+	int ret = osl(osl_get_object(ui->table, row, UT_BYTES, &obj));
+
+	if (ret < 0)
+		return ret;
+	*num_bytes = *(uint64_t *)obj.data;
+	return 1;
+}
+
+static void free_regex(regex_t *preg)
+{
+	if (!preg)
+		return;
+	regfree(preg);
+	free(preg);
+}
+
+static int compile_regex(regex_t **preg, int *invert)
+{
+	int ret;
+	size_t size;
+	char *buf, *p = select_conf.pattern_arg;
+
+	if (!select_conf.pattern_given || !p[0]) {
+		*preg = NULL;
+		return 0;
 	}
-	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(select_conf.size_unit_arg, bytes,
-				select_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 (p[0] == '!') {
+		if (!p[1]) {
+			*preg = NULL;
+			return -E_REGEX;
 		}
-		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--;
+		*invert = 1;
+		p++;
+	} else
+		*invert = 0;
+	*preg = adu_malloc(sizeof(regex_t));
+	ret = regcomp(*preg, p, 0);
+	if (!ret)
+		return 1;
+	size = regerror(ret, *preg, NULL, 0);
+	buf = adu_malloc(size);
+	regerror(ret, *preg, buf, size);
+	ERROR_LOG("%s\n", buf);
+	free(buf);
+	free_regex(*preg);
+	*preg = NULL;
+	return -E_REGEX;
+}
+
+static int dir_is_admissible(char *dirname, regex_t *preg, int inverse_matching)
+{
+	int ret;
+
+	if (!preg)
+		return 1;
+	ret = regexec(preg, dirname, 0, NULL, 0);
+	if (ret == REG_NOMATCH && !inverse_matching)
+		return 0;
+	if (ret != REG_NOMATCH && inverse_matching)
+		return 0;
 	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)
@@ -329,301 +365,729 @@ static int adu_loop_reverse(struct osl_table *t, unsigned col_num, void *private
 	return check_loop_return(ret, *loop_ret, *loop_osl_errno);
 }
 
-static void print_global_summary(void)
+static int global_summary_loop_function(struct osl_row *row, void *data)
 {
-	char d[FORMATED_VALUE_SIZE], f[FORMATED_VALUE_SIZE],
-		s[FORMATED_VALUE_SIZE];
-	enum enum_count_unit ud, uf;
-	enum enum_size_unit us;
+	struct global_summary_info *gsi = data;
+	int ret;
+	uint64_t num;
 
-	if (select_conf.no_global_summary_given)
-		return;
-	ud = format_count_value(select_conf.count_unit_arg, num_dirs, 0, d);
-	uf = format_count_value(select_conf.count_unit_arg, num_files, 0, f);
-	us = format_size_value(select_conf.size_unit_arg, num_bytes, 0, s);
-
-	if (!select_conf.no_headers_given)
-		printf("Global summary "
-			"(dirs(%c)/files(%c)/size(%c))\n",
-			count_unit_abbrevs[ud],
-			count_unit_abbrevs[uf],
-			size_unit_abbrevs[us]
-		);
-	printf("\t%s\t%s\t%s\n\n", d, f, s);
-}
-
-static int print_user_summary_line(struct user_info *ui, __a_unused void *data)
-{
-	char formated_dir_count[FORMATED_VALUE_SIZE],
-		formated_file_count[FORMATED_VALUE_SIZE],
-		formated_bytes[FORMATED_VALUE_SIZE ];
-
-	format_count_value(select_conf.count_unit_arg, ui->dirs,
-		select_conf.count_unit_arg == count_unit_arg_h,
-		formated_dir_count);
-	format_count_value(select_conf.count_unit_arg, ui->files,
-		select_conf.count_unit_arg == count_unit_arg_h,
-		formated_file_count);
-	format_size_value(select_conf.size_unit_arg, ui->bytes,
-		select_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
-	);
+	if (gsi->preg) {
+		char *dirname;
+		ret = get_dir_name_of_row(row, &dirname);
+		if (ret < 0)
+			goto err;
+		ret = dir_is_admissible(dirname, gsi->preg, gsi->inverse_matching);
+		free(dirname);
+		if (!ret)
+			return 1;
+	}
+
+	ret = get_num_files_of_row(row, &num);
+	if (ret < 0)
+		goto err;
+	gsi->num_files += num;
+
+	ret = get_num_bytes_of_row(row, &num);
+	if (ret < 0)
+		goto err;
+	gsi->num_bytes += num;
+	gsi->num_dirs++;
 	return 1;
+err:
+	gsi->ret = ret;
+	gsi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return ret;
+}
+
+static int print_global_summary(struct format_info *fi)
+{
+	int ret;
+	char *buf;
+	struct global_summary_info gsi = {.num_dirs = 0};
+	char *header = select_conf.header_given? select_conf.header_arg :
+		"Global summary\n";
+
+	union atom_value values[] = {
+		[gsa_dirs] = {.num_value = 0ULL},
+		[gsa_files] = {.num_value =  0ULL},
+		[gsa_size] = {.num_value =  0ULL}
+	};
+
+	ret = compile_regex(&gsi.preg, &gsi.inverse_matching);
+	if (ret < 0)
+		return ret;
+	ret = adu_loop_reverse(dir_table, DT_BYTES, &gsi,
+		global_summary_loop_function, &gsi.ret, &gsi.osl_errno);
+	free_regex(gsi.preg);
+	if (ret < 0)
+		return ret;
+	values[gsa_dirs].num_value = (long long unsigned)gsi.num_dirs;
+	values[gsa_files].num_value = (long long unsigned)gsi.num_files;
+	values[gsa_size].num_value = (long long unsigned)gsi.num_bytes;
+
+	ret = output("%s", header);
+	if (ret < 0)
+		return ret;
+	buf = format_items(fi, values);
+	ret = output("%s", buf);
+	free(buf);
+	if (ret < 0)
+		return ret;
+	return output("%s", select_conf.trailer_arg);
+}
+
+static int user_summary_loop_function(struct osl_row *row, void *data)
+{
+	struct user_summary_info *usi = data;
+	uint64_t num;
+	int ret;
+
+	if (usi->preg) {
+		char *dirname;
+		ret = get_dir_name_of_row(row, &dirname);
+		if (ret < 0)
+			goto err;
+		ret = dir_is_admissible(dirname, usi->preg, usi->inverse_matching);
+		free(dirname);
+		if (!ret)
+			return 1;
+	}
+	ret = get_num_user_files(row, usi->ui, &num);
+	if (ret < 0)
+		goto err;
+	usi->files += num;
+	ret = get_num_user_bytes(row, usi->ui, &num);
+	if (ret < 0)
+		goto err;
+	usi->bytes += num;
+	usi->dirs++;
+	return 1;
+err:
+	usi->ret = ret;
+	usi->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return ret;
+}
+
+static int compute_user_summary(struct user_info *ui, void *data)
+{
+	struct user_summary_loop_data *usld = data;
+	struct user_summary_info *usi = usld->current++;
+	int ret = compile_regex(&usi->preg, &usi->inverse_matching);
+
+	if (ret < 0)
+		return ret;
+	usi->ui = ui;
+	ret = adu_loop_reverse(ui->table, UT_BYTES, usi, user_summary_loop_function,
+		&usi->ret, &usi->osl_errno);
+	free_regex(usi->preg);
+	return ret;
+}
+
+static int print_user_summary_line(struct user_summary_info *usi,
+		struct format_info *fi)
+{
+	struct user_info *ui = usi->ui;
+	union atom_value values[] = {
+		[usa_pw_name] = {.string_value = ui->pw_name?
+			ui->pw_name : "?"},
+		[usa_uid] = {.num_value = (long long unsigned)ui->uid},
+		[usa_dirs] = {.num_value = (long long unsigned)usi->dirs},
+		[usa_files] = {.num_value = (long long unsigned)usi->files},
+		[usa_size] = {.num_value =  (long long unsigned)usi->bytes}
+	};
+	char *buf = format_items(fi, values);
+	int ret = output("%s", buf);
+
+	free(buf);
+	return ret;
 }
 
 static int name_comp(const void *a, const void *b)
 {
-	char *x = ((struct user_info *)a)->pw_name;
-	char *y = ((struct user_info *)b)->pw_name;
+	const struct user_summary_info *x = a, *y = b;
+	char *n1 = x->ui->pw_name;
+	char *n2 = y->ui->pw_name;
 
-	if (!x)
+	if (!n1)
 		return 1;
-	if (!y)
+	if (!n2)
 		return -1;
-	return strcmp(x, y);
+	return strcmp(n1, n2);
 }
 
 static int uid_comp(const void *a, const void *b)
 {
-	return -NUM_COMPARE(((struct user_info *)a)->uid,
-		((struct user_info *)b)->uid);
+	const struct user_summary_info *x = a, *y = b;
+	return -NUM_COMPARE(x->ui->uid, y->ui->uid);
 }
 
 static int dir_count_comp(const void *a, const void *b)
 {
-	return NUM_COMPARE(((struct user_info *)a)->dirs,
-		((struct user_info *)b)->dirs);
+	const struct user_summary_info *x = a, *y = b;
+	return NUM_COMPARE(x->dirs, y->dirs);
 }
 
 static int file_count_comp(const void *a, const void *b)
 {
-	return NUM_COMPARE(((struct user_info *)a)->files,
-		((struct user_info *)b)->files);
+	const struct user_summary_info *x = a, *y = b;
+	return NUM_COMPARE(x->files, y->files);
 }
 
 static int size_comp(const void *a, const void *b)
 {
-	return NUM_COMPARE(((struct user_info *)a)->bytes,
-		((struct user_info *)b)->bytes);
+	const struct user_summary_info *x = a, *y = b;
+	return NUM_COMPARE(x->bytes, y->bytes);
 }
 
-/*
- * The comparators for sorting the user summary.
- *
- * This is an array of pointers to functions taking two constant void *
- * pointers and returning an int.
- */
-static int (*summary_comparators[])(const void *, const void *) = {
-	[user_summary_sort_arg_name] = name_comp,
-	[user_summary_sort_arg_uid] = uid_comp,
-	[user_summary_sort_arg_dir_count] = dir_count_comp,
-	[user_summary_sort_arg_file_count] = file_count_comp,
-	[user_summary_sort_arg_size] = size_comp,
-};
-
-static void print_user_summary(void)
+static int count_admissible_users(__a_unused struct user_info *ui, void *data)
 {
-	if (select_conf.no_user_summary_given)
-		return;
-	if (!select_conf.no_headers_given)
-		printf("User summary "
-			"(pw_name/uid/dirs%s/files%s/size%s):\n",
-			count_unit_buf, count_unit_buf, size_unit_buf);
-	sort_hash_table(summary_comparators[select_conf.user_summary_sort_arg]);
-	for_each_admissible_user(print_user_summary_line, NULL);
+	struct user_summary_loop_data *usld = data;
+	usld->num_admissible_users++;
+	return 1;
 }
 
-static int print_user_list(struct user_info *ui, __a_unused void *data)
+static int print_user_summary(struct format_info *fi)
 {
-	int ret;
-	struct user_stats_info usi;
-	enum enum_user_list ula = select_conf.user_list_arg;
-	int print_size_list = (ula == user_list_arg_size
-		|| ula == user_list_arg_both);
-
-	if (print_size_list) {
-		usi.count = select_conf.limit_arg;
-		usi.ui = ui;
-		usi.flags = USF_PRINT_DIRNAME | USF_PRINT_BYTES | USF_COMPUTE_SUMMARY;
-		if (!select_conf.no_headers_given)
-			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");
+	int i, ret;
+	int (*comp)(const void *a, const void *b);
+	struct user_summary_loop_data usld = { .fi = fi};
+	char *header = select_conf.header_given? select_conf.header_arg :
+		"User summary\n";
+
+	ret = output("%s", header);
+	if (ret < 0)
+		return ret;
+	ret = for_each_admissible_user(count_admissible_users, &usld);
+	if (ret < 0)
+		return ret;
+	if (usld.num_admissible_users == 0)
+		return 1;
+	usld.usis = adu_calloc(usld.num_admissible_users
+		* sizeof(struct user_summary_info));
+	usld.current = usld.usis;
+	ret = for_each_admissible_user(compute_user_summary, &usld);
+	if (ret < 0)
+		goto out;
+	switch (select_conf.user_summary_sort_arg) {
+	case user_summary_sort_arg_name:
+		comp = name_comp;
+		break;
+	case user_summary_sort_arg_uid:
+		comp = uid_comp;
+		break;
+	case user_summary_sort_arg_dir_count:
+		comp = dir_count_comp;
+		break;
+	case user_summary_sort_arg_file_count:
+		comp = file_count_comp;
+		break;
+	case user_summary_sort_arg_size:
+		comp = size_comp;
+		break;
+	default: /* this should never happen, but anyway */
+		comp = size_comp;
+		break;
 	}
-	if (ula == user_list_arg_file_count || ula == user_list_arg_both) {
-		if (!select_conf.no_headers_given)
-			printf("%s (uid %u), by file count%s:\n",
-				ui->pw_name? ui->pw_name : "?", (unsigned)ui->uid,
-				count_unit_buf);
-		usi.count = select_conf.limit_arg,
-		usi.ui = ui;
-		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);
+	qsort(usld.usis, usld.num_admissible_users,
+		sizeof(struct user_summary_info), comp);
+	for (i = 0; i < usld.num_admissible_users; i++) {
+		if (select_conf.limit_arg >= 0 && i > select_conf.limit_arg)
+			break;
+		ret = print_user_summary_line(usld.usis + i, usld.fi);
 		if (ret < 0)
-			return ret;
-		printf("\n");
+			goto out;
 	}
-	if (ula == user_list_arg_none && !select_conf.no_user_summary_given) {
-		usi.count = select_conf.limit_arg;
-		usi.ui = ui;
-		usi.flags = USF_COMPUTE_SUMMARY;
-		ret = adu_loop_reverse(ui->table, UT_FILES, &usi, user_stats_loop_function,
-			&usi.ret, &usi.osl_errno);
-		if (ret < 0)
-			return ret;
+	ret = output("%s", select_conf.trailer_arg);
+out:
+	free(usld.usis);
+	return ret;
+}
+
+static int user_list_loop_function(struct osl_row *row, void *data)
+{
+	struct user_list_info *uli = data;
+	union atom_value values[] = {
+		[ula_pw_name] = {.string_value = uli->ui->pw_name?
+			uli->ui->pw_name : "?"},
+		[ula_uid] = {.num_value = (long long unsigned)uli->ui->uid},
+		[ula_files] = {.num_value = 0ULL},
+		[ula_size] = {.num_value =  0ULL},
+		[ula_dirname] = {.string_value = NULL}
+	};
+	uint64_t num;
+	int ret;
+	char *dirname = NULL, *buf;
+
+	check_signals();
+	ret = -E_LOOP_COMPLETE;
+	if (!uli->count)
+		goto err;
+
+	ret = get_dir_name_of_user_row(row, uli->ui, &dirname);
+	if (ret < 0)
+		goto err;
+	if (!dir_is_admissible(dirname, uli->preg, uli->inverse_matching)) {
+		free(dirname);
+		return 1;
 	}
-	return 1;
+	values[ula_dirname].string_value = dirname;
+
+	ret = get_num_user_files(row, uli->ui, &num);
+	if (ret < 0)
+		goto err;
+	values[ula_files].num_value = num;
+
+	ret = get_num_user_bytes(row, uli->ui, &num);
+	if (ret < 0)
+		goto err;
+	values[ula_size].num_value = num;
+
+	buf = format_items(uli->fi, values);
+	free(dirname);
+	dirname = NULL;
+	ret = output("%s", buf);
+	free(buf);
+	if (ret < 0)
+		goto err;
+	uli->count--;
+	return ret;
+err:
+	free(dirname);
+	uli->ret = ret;
+	uli->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return ret;
 }
 
-static int print_user_lists(void)
+static int print_user_list(struct user_info *ui, void *data)
 {
-	return for_each_admissible_user(print_user_list, NULL);
+	struct user_list_format_info *ulfi = data;
+	int ret;
+	enum user_table_columns sort_column;
+	struct user_list_info uli = {
+		.ui = ui,
+		.fi = ulfi->fi,
+		.count = select_conf.limit_arg
+	};
+	union atom_value header_trailer_values[] = {
+		[ulha_uid] = {.num_value = (long long unsigned)ui->uid},
+		[ulha_pw_name] = {.string_value = ui->pw_name?
+			ui->pw_name : "?"}
+	};
+	char *buf = format_items(ulfi->header_fi, header_trailer_values);
+
+	ret = output("%s", buf);
+	free(buf);
+	if (ret < 0)
+		return ret;
+	if (select_conf.list_sort_arg == list_sort_arg_file_count)
+		sort_column = UT_FILES;
+	else
+		sort_column = UT_BYTES;
+
+	ret = compile_regex(&uli.preg, &uli.inverse_matching);
+	if (ret < 0)
+		return ret;
+	ret = adu_loop_reverse(ui->table, sort_column, &uli,
+		user_list_loop_function, &uli.ret, &uli.osl_errno);
+	free_regex(uli.preg);
+	if (ret < 0)
+		return ret;
+	buf = format_items(ulfi->trailer_fi, header_trailer_values);
+	ret = output("%s", buf);
+	free(buf);
+	return ret;
+}
+
+static int print_user_lists(struct format_info *fi)
+{
+	struct user_list_format_info ulfi = {.fi = fi};
+	char *header_fmt = select_conf.header_given?
+		select_conf.header_arg : "uid %(uid)(%(pw_name)):\n";
+	char *trailer_fmt = select_conf.trailer_arg;
+	int ret = parse_format_string(header_fmt,
+		user_list_header_trailer_atoms, &ulfi.header_fi);
+	if (ret < 0)
+		return ret;
+	ret = parse_format_string(trailer_fmt,
+		user_list_header_trailer_atoms, &ulfi.trailer_fi);
+	if (ret < 0)
+		return ret;
+	ret = for_each_admissible_user(print_user_list, &ulfi);
+	free_format_info(ulfi.header_fi);
+	free_format_info(ulfi.trailer_fi);
+	return ret;
 }
 
-static int print_global_lists(void)
+static int global_list_loop_function(struct osl_row *row, void *data)
 {
-	struct global_stats_info gsi;
+	struct global_list_info *gli = data;
+	union atom_value values[] = {
+		[gla_size] = {.num_value = 0ULL},
+		[gla_files] = {.num_value =  0ULL},
+		[gla_dirname] = {.string_value = NULL}
+	};
+	uint64_t num_files, num_bytes;
+	char *dirname = NULL, *buf;
 	int ret;
-	enum enum_global_list gla = select_conf.global_list_arg;
-	int print_size_list = (gla == global_list_arg_size
-		|| gla == global_list_arg_both);
-
-	if (print_size_list) {
-		gsi.count = select_conf.limit_arg;
-		gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_BYTES | GSF_COMPUTE_SUMMARY;
-		if (!select_conf.no_headers_given)
-			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");
-	}
-	if (gla == global_list_arg_file_count || gla == global_list_arg_both) {
-		gsi.count = select_conf.limit_arg;
-		gsi.flags = GSF_PRINT_DIRNAME | GSF_PRINT_FILES;
-		if (!print_size_list)
-			gsi.flags |= GSF_COMPUTE_SUMMARY;
-		if (!select_conf.no_headers_given)
-			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");
-	}
-	if (gla == global_list_arg_none && !select_conf.no_global_summary_given) {
-		/* must compute summary */
-		gsi.count = select_conf.limit_arg;
-		gsi.flags = GSF_COMPUTE_SUMMARY;
-		ret = adu_loop_reverse(dir_table, DT_FILES, &gsi,
-			global_stats_loop_function, &gsi.ret, &gsi.osl_errno);
-		if (ret < 0)
-			return ret;
+
+	check_signals();
+	ret = -E_LOOP_COMPLETE;
+	if (!gli->count)
+		goto err;
+
+	ret = get_dir_name_of_row(row, &dirname);
+	if (ret < 0)
+		goto err;
+	if (!dir_is_admissible(dirname, gli->preg, gli->inverse_matching)) {
+		free(dirname);
+		return 1;
 	}
-	return 1;
+	values[gla_dirname].string_value = dirname;
+
+	ret = get_num_files_of_row(row, &num_files);
+	if (ret < 0)
+		goto err;
+	values[gla_files].num_value = (long long unsigned)num_files;
+
+	ret = get_num_bytes_of_row(row, &num_bytes);
+	if (ret < 0)
+		goto err;
+	values[gla_size].num_value = (long long unsigned)num_bytes;
+
+	buf = format_items(gli->fi, values);
+	free(dirname);
+	dirname = NULL;
+	ret = output("%s", buf);
+	free(buf);
+	if (ret < 0)
+		goto err;
+	if (gli->count > 0)
+		gli->count--;
+	return ret;
+err:
+	free(dirname);
+	gli->ret = ret;
+	gli->osl_errno = (ret == -E_OSL)? osl_errno : 0;
+	return -1;
 }
 
-static int print_statistics(void)
+static int print_global_list(struct format_info *fi)
 {
 	int ret;
+	enum dir_table_columns sort_column;
+	struct global_list_info gli = {
+		.fi = fi,
+		.count = select_conf.limit_arg
+	};
+	char *header = select_conf.header_given?
+		select_conf.header_arg : "Global list\n";
 
-	ret = print_global_lists();
+	ret = output("%s", header);
 	if (ret < 0)
 		return ret;
-	print_global_summary();
-	print_user_lists();
-	print_user_summary();
-	return 1;
+	if (select_conf.list_sort_arg == list_sort_arg_file_count)
+		sort_column = DT_FILES;
+	else
+		sort_column = DT_BYTES;
+	ret = compile_regex(&gli.preg, &gli.inverse_matching);
+	if (ret < 0)
+		return ret;
+	ret = adu_loop_reverse(dir_table, sort_column, &gli,
+		global_list_loop_function, &gli.ret, &gli.osl_errno);
+	free_regex(gli.preg);
+	if (ret < 0)
+		return ret;
+	return output("%s", select_conf.trailer_arg);
 }
 
-static int read_uid_file(struct uid_range *admissible_uids)
+static int print_statistics(struct format_info *fi)
 {
-	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);
-	unsigned bits;
+	switch (select_conf.select_mode_arg) {
+	case select_mode_arg_global_list:
+		return print_global_list(fi);
+	case select_mode_arg_global_summary:
+		return print_global_summary(fi);
+	case select_mode_arg_user_list:
+		return print_user_lists(fi);
+	case select_mode_arg_user_summary:
+		return print_user_summary(fi);
+	};
+	ERROR_LOG("bad select mode\n");
+	return -ERRNO_TO_ERROR(EINVAL);
+}
 
-	if (ret < 0) {
-		INFO_LOG("failed to map %s\n", filename);
-		free(filename);
-		return ret;
+static int open_pipe(char *path)
+{
+	int p[2], ret, argc;
+	char **argv;
+
+	ret = pipe(p);
+	if (ret < 0)
+		return ERRNO_TO_ERROR(errno);
+	ret = fork();
+	if (ret < 0)
+		return ERRNO_TO_ERROR(errno);
+	if (ret) { /* parent */
+		DEBUG_LOG("created process %d\n", ret);
+		close(p[0]);
+		output_file = fdopen(p[1], "w");
+		if (!output_file)
+			return ERRNO_TO_ERROR(errno);
+		return 1;
+	}
+	close(p[1]);
+	if (p[0] != STDIN_FILENO)
+		dup2(p[0], STDIN_FILENO);
+	DEBUG_LOG("executing %s\n", path);
+	argc = split_args(path, &argv, " \t");
+	execvp(argv[0], argv);
+	ERROR_LOG("error executing %s: %s\n", path,
+		adu_strerror(ERRNO_TO_ERROR(errno)));
+	_exit(EXIT_FAILURE);
+}
+
+static int open_output_stream(void)
+{
+	char *p;
+	int ret, flags = O_WRONLY | O_CREAT;
+
+	if (!select_conf.output_given)
+		goto use_stdout;
+	p = select_conf.output_arg;
+	switch (p[0]) {
+	case '\0': /* empty string */
+		goto bad_output_arg;
+	case '-':
+		if (!p[1]) /* "-" means stdout */
+			goto use_stdout;
+		/* string starting with a dash */
+		flags |= O_EXCL;
+		goto open_file;
+	case '>':
+		if (!p[1]) /* ">" is invalid */
+			goto bad_output_arg;
+		if (p[1] != '>') {
+			p++;
+			flags |= O_TRUNC;
+			goto open_file;
+		}
+		/* string starting with ">>" */
+		if (!p[2]) /* ">>" is invalid */
+			goto bad_output_arg;
+		flags |= O_APPEND;
+		p += 2;
+		goto open_file;
+	case '|':
+		if (!p[1]) /* "|" is invalid */
+			goto bad_output_arg;
+		p++;
+		return open_pipe(p);
+	default: /* args starts with no magic character */
+		flags |= O_EXCL;
+		goto open_file;
 	}
-	num_uids = size / 4;
-	INFO_LOG("found %u uids in %s\n", (unsigned)num_uids, filename);
-	free(filename);
+use_stdout:
+	output_file = stdout;
+	return 1;
+bad_output_arg:
+	output_file = NULL;
+	return -E_BAD_OUTPUT_ARG;
+open_file:
 	/*
-	 * Compute number of hash table bits. The hash table size must be a
-	 * power of two and larger than the number of uids.
+	 * glibc's 'x' mode to fopen is not portable, so use open() and
+	 * fdopen().
 	 */
-	bits = 2;
-	while (1 << bits < num_uids)
-		bits++;
-	create_hash_table(bits);
-	for (n = 0; n < num_uids; n++) {
-		uint32_t uid = read_u32(map + n * sizeof(uid));
-		ret = search_uid(uid, admissible_uids, OPEN_USER_TABLE, NULL);
-		if (ret < 0)
-			goto out;
-	}
+	ret = open(p, flags, 0644);
+	if (ret < 0)
+		return -ERRNO_TO_ERROR(errno);
+	output_file = fdopen(ret, "w");
+	if (!output_file)
+		return -ERRNO_TO_ERROR(errno);
+	return 1;
+}
+
+/**
+ * Execute a select query.
+ *
+ * \param admissible_uids User IDs to take into account.
+ * \param fi Format information.
+ *
+ * Called once in select mode or for each \a run command in interactive mode.
+ *
+ * Open the output stream and the dir table if not already open. For each
+ * admissible uid, the user table is opened if necessary. After these
+ * preparations, the output according to \a select_mode and \a fi is written to
+ * the output stream.
+ *
+ * \return Standard.
+ */
+int run_select_query(struct uid_range *admissible_uids, struct format_info *fi)
+{
+	int ret = open_output_stream();
+
+	if (ret < 0)
+		goto out;
+	ret = open_dir_table(0);
+	if (ret < 0)
+		goto out;
+	check_signals();
+	ret = open_admissible_user_tables(admissible_uids);
+	if (ret < 0)
+		goto out;
+	check_signals();
+	ret = print_statistics(fi);
 out:
-	adu_munmap(map, size);
+	if (output_file && output_file != stdout) {
+		fclose(output_file);
+		output_file = NULL;
+	}
 	return ret;
 }
 
-int com_select(void)
+/** Default format string for global_list mode. */
+#define GLOBAL_LIST_DFLT_FMT "%(size:r:8) %(files:r:8) %(dirname)\n"
+/** Default format string for global_summary mode. */
+#define GLOBAL_SUMMARY_DFLT_FMT "#directories: %(dirs), #files: %(files), size: %(size)\n"
+/** Default format string for user_list mode. */
+#define USER_LIST_DFLT_FMT "%(size:r:5) %(files:r:5) %(dirname)\n"
+/** Default format string for user_summary mode. */
+#define USER_SUMMARY_DFLT_FMT "%(pw_name:l:16) %(uid:r:6) %(dirs:r:5) %(files:r:5) %(size:r:5)\n"
+
+static int setup_format_string(char *fmt, struct format_info **fi)
 {
-	int ret;
-	struct uid_range *admissible_uids = NULL;
+	struct atom *atoms;
 
-	if (conf.select_options_given) {
-		struct select_cmdline_parser_params params = {
-			.override = 1,
-			.initialize = 1,
-			.check_required = 1,
-			.check_ambiguity = 1,
-			.print_errors = 1
-		};
-
-		if (select_cmdline_parser_string_ext(conf.select_options_arg,
-			&select_conf, "select", &params))
-			return -E_SYNTAX;
-		ret = parse_uid_arg(select_conf.uid_arg, &admissible_uids);
+	if (!fmt)
+		INFO_LOG("using default format string\n");
+	switch (select_conf.select_mode_arg) {
+	case select_mode_arg_global_list:
+		if (!fmt)
+			fmt = GLOBAL_LIST_DFLT_FMT;
+		atoms = global_list_atoms;
+		break;
+	case select_mode_arg_global_summary:
+		if (!fmt)
+			fmt = GLOBAL_SUMMARY_DFLT_FMT;
+		atoms = global_summary_atoms;
+		break;
+	case select_mode_arg_user_list:
+		if (!fmt)
+			fmt = USER_LIST_DFLT_FMT;
+		atoms = user_list_atoms;
+		break;
+	case select_mode_arg_user_summary:
+		if (!fmt)
+			fmt = USER_SUMMARY_DFLT_FMT;
+		atoms = user_summary_atoms;
+		break;
+	default:
+		ERROR_LOG("bad select mode\n");
+		return -ERRNO_TO_ERROR(EINVAL);
+	};
+	INFO_LOG("format string: %s\n", fmt);
+	return parse_format_string(fmt, atoms, fi);
+}
+
+/**
+ * Parse a given format string.
+ *
+ * \param string The format string to parse.
+ * \param params gengetopt parameters.
+ * \param admissible_uids The array of admissible uid ranges.
+ * \param fi The format info to be used with format_items().
+ *
+ * If \a string is not \p NULL, it is broken down into its components using
+ * \ref create_argv() and the resulting argument vector is passed together with
+ * \a params to gengetopt's command line parser. If --help or --detailed-help
+ * was specified in \a string, the corresponding help text is printed and the
+ * function returns zero.
+ *
+ * Otherwise, any --uid or --user options are parsed and transformed into an
+ * array of admissible uids which is returned via \a admissible_uids.
+ *
+ * Finally, the format string given by --format (or the default format string
+ * for the given select mode if no --format option was given in \a string) is
+ * parsed as well resulting in a format_info structure which is returned via
+ * \a fi. The caller uses the \a fi pointer later to format each output line.
+ *
+ * \return Negative on errors, zero if --help or --detailed-help was given,
+ * positive otherwise.
+ *
+ * \sa format_items().
+ */
+int parse_select_options(char *string, struct select_cmdline_parser_params *params,
+		struct uid_range **admissible_uids, struct format_info **fi)
+{
+	int ret, num_uid_ranges;
+	const char **line;
+	char *fmt = NULL;
+
+	if (string) {
+		int argc;
+		char **argv;
+
+		ret = create_argv(string, &argv);
 		if (ret < 0)
 			return ret;
+		argc = ret;
+		ret = select_cmdline_parser_ext(argc, argv, &select_conf, params);
+		free_argv(argv);
+		if (ret)
+			return -E_SYNTAX;
+		if (select_conf.help_given || select_conf.detailed_help_given)
+			goto help;
+		fmt = select_conf.format_arg;
 	}
-
-	if (select_conf.count_unit_arg != count_unit_arg_h)
-		count_unit_buf[1] = count_unit_abbrevs[select_conf.count_unit_arg];
-	else
-		count_unit_buf[0] = '\0';
-	if (select_conf.size_unit_arg != size_unit_arg_h)
-		size_unit_buf[1] = size_unit_abbrevs[select_conf.size_unit_arg];
-	else
-		size_unit_buf[0] = '\0';
-
-	ret = open_dir_table(0);
+	ret = parse_uid_arg(select_conf.uid_arg, admissible_uids);
 	if (ret < 0)
 		return ret;
-	check_signals();
-	ret = read_uid_file(admissible_uids);
+	num_uid_ranges = ret;
+	ret = append_users(select_conf.user_arg, select_conf.user_given,
+		admissible_uids, num_uid_ranges);
 	if (ret < 0)
 		return ret;
-	check_signals();
-	ret = print_statistics();
-	close_all_tables();
+	return setup_format_string(fmt, fi);
+help:
+	line = select_conf.detailed_help_given?
+		select_args_info_detailed_help : select_args_info_help;
+	if (!output_file)
+		output_file = stdout;
+	for (; *line; line++) {
+		ret = output("%s\n", *line);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+/**
+ * Main function for select mode.
+ *
+ * \return Standard.
+ */
+int com_select(void)
+{
+	struct uid_range *admissible_uids = NULL;
+	int ret;
+	struct format_info *fi;
+	struct select_cmdline_parser_params params = {
+		.override = 1,
+		.initialize = 1,
+		.check_required = 1,
+		.check_ambiguity = 1,
+		.print_errors = 1
+	};
+
+	ret = parse_select_options(conf.select_options_arg, &params,
+		&admissible_uids, &fi);
+	if (ret > 0) {
+		ret = read_uid_file();
+		if (ret < 0)
+			goto out;
+		ret = run_select_query(admissible_uids, fi);
+		free_format_info(fi);
+	}
+out:
+	select_cmdline_parser_free(&select_conf);
 	return ret;
 }