Add stat(1).

doc/user-guide

@@ -212,6 +212,7 @@ Sortix comes with a number of home-made programs. Here is an overview:
 * `sh` - command shell
 * `sleep` - delay for a specified amount of time
 * `sort` - sort lines of text files
+* `stat` - display file status
 * `tail` - display end of file
 * `time` - measure program running time
 * `trianglix` - triangle system

utils/.gitignore

@@ -37,6 +37,7 @@ rm
 rmdir
 sleep
 sort
+stat
 tail
 time
 tr

utils/Makefile

@@ -49,6 +49,7 @@ rm \
 rmdir \
 sleep \
 sort \
+stat \
 tail \
 time \
 tr \

utils/stat.cpp

@@ -0,0 +1,215 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2015.
+
+    This program is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+    more details.
+
+    You should have received a copy of the GNU General Public License along with
+    this program. If not, see <http://www.gnu.org/licenses/>.
+
+    stat.cpp
+    Display file status.
+
+*******************************************************************************/
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <grp.h>
+#include <locale.h>
+#include <pwd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+char file_type_character(mode_t mode)
+{
+	if ( S_ISBLK(mode) )
+		return 'b';
+	if ( S_ISCHR(mode) )
+		return 'c';
+	if ( S_ISDIR(mode) )
+		return 'd';
+	if ( S_ISFIFO(mode) )
+		return 'p';
+	if ( S_ISLNK(mode) )
+		return 'l';
+	if ( S_ISREG(mode) )
+		return '-';
+	if ( S_ISSOCK(mode) )
+		return 's';
+	return '?';
+}
+
+static void render_perms(char perms[11], mode_t mode)
+{
+	perms[0] = file_type_character(mode);
+	const char flagnames[] = { 'x', 'w', 'r' };
+	for ( size_t i = 0; i < 9; i++ )
+	{
+		perms[9-i] = mode & 1 << i ? flagnames[i % 3] : '-';
+	}
+	if ( mode & S_ISUID )
+		perms[3] = mode & 0100 ? 's' : 'S';
+	if ( mode & S_ISGID )
+		perms[6] = mode & 0010 ? 's' : 'S';
+	if ( mode & S_ISVTX )
+		perms[9] = mode & 0001 ? 't' : 'T';
+	perms[10] = 0;
+}
+
+static void display_status(struct stat* st, const char* path)
+{
+	printf("File: `%s'", path);
+	if ( S_ISLNK(st->st_mode) && (uintmax_t) st->st_size < (uintmax_t) SIZE_MAX )
+	{
+		size_t target_size = (size_t) st->st_size;
+		char* target = (char*) malloc(target_size + 1);
+		ssize_t target_read;
+		if ( target && 0 <= (target_read = readlink(path, target, target_size)) )
+		{
+			target[target_read] = '\0';
+			printf(" -> `%s'", target);
+		}
+		free(target);
+	}
+	printf("\n");
+	printf("Size: %" PRIiOFF "\n", st->st_size);
+	char perms[11];
+	render_perms(perms, st->st_mode);
+	printf("Mode: %" PRIoMODE "/%s", st->st_mode, perms);
+	printf("\n");
+	printf("Device: 0x%" PRIXDEV "\n", st->st_dev);
+	printf("Inode: %" PRIuINO "\n", st->st_ino);
+	printf("Links: %" PRIuNLINK "\n", st->st_nlink);
+	printf("UID: %" PRIuUID "", st->st_uid);
+	struct passwd* pwd = getpwuid(st->st_uid);
+	if ( pwd )
+		printf("/%s", pwd->pw_name);
+	printf("\n");
+	printf("GID: %" PRIuGID "", st->st_gid);
+	struct group* grp = getgrgid(st->st_gid);
+	if ( grp )
+		printf("/%s", grp->gr_name);
+	printf("\n");
+	struct tm tm;
+	localtime_r(&st->st_atim.tv_sec, &tm);
+	printf("Access: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
+	       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+	       tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_atim.tv_nsec);
+	localtime_r(&st->st_mtim.tv_sec, &tm);
+	printf("Modify: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
+	       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+	       tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_mtim.tv_nsec);
+	localtime_r(&st->st_ctim.tv_sec, &tm);
+	printf("Change: %i-%02i-%02i %02i:%02i:%02i.%09li\n",
+	       tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+	       tm.tm_hour, tm.tm_min, tm.tm_sec, st->st_ctim.tv_nsec);
+	printf("Blocksize: %" PRIiBLKSIZE "\n", st->st_blksize);
+	printf("Blocks: %" PRIiBLKCNT "\n", st->st_blocks);
+}
+
+static void compact_arguments(int* argc, char*** argv)
+{
+	for ( int i = 0; i < *argc; i++ )
+	{
+		while ( i < *argc && !(*argv)[i] )
+		{
+			for ( int n = i; n < *argc; n++ )
+				(*argv)[n] = (*argv)[n+1];
+			(*argc)--;
+		}
+	}
+}
+
+static void help(FILE* fp, const char* argv0)
+{
+	fprintf(fp, "Usage: %s [OPTION]...\n", argv0);
+	fprintf(fp, "List processes.\n");
+}
+
+static void version(FILE* fp, const char* argv0)
+{
+	fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
+	fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
+	fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
+	fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
+}
+
+int main(int argc, char* argv[])
+{
+	setlocale(LC_ALL, "");
+
+	bool dereference = false;
+
+	const char* argv0 = argv[0];
+	for ( int i = 1; i < argc; i++ )
+	{
+		const char* arg = argv[i];
+		if ( arg[0] != '-' || !arg[1] )
+			continue;
+		argv[i] = NULL;
+		if ( !strcmp(arg, "--") )
+			break;
+		if ( arg[1] != '-' )
+		{
+			while ( char c = *++arg ) switch ( c )
+			{
+			case 'L': dereference = true; break;
+			default:
+				fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
+				help(stderr, argv0);
+				exit(1);
+			}
+		}
+		else if ( !strcmp(arg, "--help") )
+			help(stdout, argv0), exit(0);
+		else if ( !strcmp(arg, "--version") )
+			version(stdout, argv0), exit(0);
+		else if ( !strcmp(arg, "--dereference") )
+			dereference = true;
+		else
+		{
+			fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
+			help(stderr, argv0);
+			exit(1);
+		}
+	}
+
+	compact_arguments(&argc, &argv);
+
+	int result = 0;
+
+	if ( argc <= 1 )
+	{
+		struct stat st;
+		if ( fstat(0, &st) < 0 )
+			err(1, "fstat: %s", "<stdin>");
+		display_status(&st, "<stdin>");
+	}
+	else for ( int i = 1; i < argc; i++ )
+	{
+		struct stat st;
+		if ( (dereference ? stat : lstat)(argv[i], &st) < 0 )
+		{
+			warn("fstat: %s", argv[i]);
+			result = 1;
+			continue;
+		}
+		display_status(&st, argv[i]);
+	}
+
+	return ferror(stdout) || fflush(stdout) == EOF ? 1 : result;
+}