coreutils-8.25HEADcoreutils-8.25master

1 files changed, 206 insertions, 0 deletions

diff --git a/src/coreutils.c b/src/coreutils.c
new file mode 100644
index 0000000..4e44448
--- /dev/null
+++ b/src/coreutils.c
@@ -0,0 +1,206 @@
+/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
+
+   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/>.  */
+
+/* coreutils.c aggregates the functionality of every other tool into a single
+   binary multiplexed by the value of argv[0]. This is enabled by passing
+   --enable-single-binary to configure.
+
+   Written by Alex Deymo <deymo@chromium.org>.  */
+
+#include <config.h>
+#include <getopt.h>
+#include <stdio.h>
+#if HAVE_PRCTL
+# include <sys/prctl.h>
+#endif
+
+#include "system.h"
+#include "error.h"
+#include "quote.h"
+
+#ifdef SINGLE_BINARY
+/* Declare the main function on each one of the selected tools.  This name
+   needs to match the one passed as CFLAGS on single-binary.mk (generated
+   by gen-single-binary.sh). */
+# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) \
+  int single_binary_main_##main_name (int, char **);
+# include "coreutils.h"
+# undef SINGLE_BINARY_PROGRAM
+#endif
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "coreutils"
+
+#define AUTHORS \
+  proper_name ("Alex Deymo")
+
+static struct option const long_options[] =
+{
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {NULL, 0, NULL, 0}
+};
+
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("\
+Usage: %s --coreutils-prog=PROGRAM_NAME [PARAMETERS]... \n"),
+              program_name);
+      fputs (_("\
+Execute the PROGRAM_NAME built-in program with the given PARAMETERS.\n\
+\n"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+
+#ifdef SINGLE_BINARY
+/* XXX: Ideally we'd like to present "install" here, not "ginstall".  */
+      char const *prog_name_list =
+# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) " " prog_name_str
+# include "coreutils.h"
+# undef SINGLE_BINARY_PROGRAM
+      ;
+      printf ("\n\
+Built-in programs:\n\
+%s\n", prog_name_list);
+#endif
+
+      printf (_("\
+\n\
+Use: '%s --coreutils-prog=PROGRAM_NAME --help' for individual program help.\n"),
+              program_name);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+static void
+launch_program (const char *prog_name, int prog_argc, char **prog_argv)
+{
+  int (*prog_main) (int, char **) = NULL;
+
+  /* Ensure that at least one parameter was passed.  */
+  if (!prog_argc || !prog_argv || !prog_argv[0] || !prog_name)
+    return;
+
+#ifdef SINGLE_BINARY
+  if (false);
+  /* Look up the right main program.  */
+# define SINGLE_BINARY_PROGRAM(prog_name_str, main_name) \
+  else if (STREQ (prog_name_str, prog_name)) \
+    prog_main = single_binary_main_##main_name;
+# include "coreutils.h"
+# undef SINGLE_BINARY_PROGRAM
+#endif
+
+  if (! prog_main)
+    return;
+
+#if HAVE_PRCTL && defined PR_SET_NAME
+  /* Not being able to set the program name is not a fatal error.  */
+  prctl (PR_SET_NAME, prog_argv[0]);
+#endif
+#if HAVE_PRCTL && defined PR_SET_MM_ARG_START
+  /* Shift the beginning of the command line to prog_argv[0] (if set) so
+     /proc/pid/cmdline reflects the right value.  */
+  prctl (PR_SET_MM_ARG_START, prog_argv[0]);
+#endif
+
+  exit (prog_main (prog_argc, prog_argv));
+}
+
+int
+main (int argc, char **argv)
+{
+  char *prog_name = last_component (argv[0]);
+  int optc;
+
+  /* Map external name to internal name.  */
+  char ginstall[] = "ginstall";
+  if (STREQ (prog_name, "install"))
+    prog_name = ginstall;
+
+  /* If this program is called directly as "coreutils" or if the value of
+     argv[0] is an unknown tool (which "coreutils" is), we proceed and parse
+     the options.  */
+  launch_program (prog_name, argc, argv);
+
+  /* No known program was selected via argv[0].  Try parsing the first
+     argument as --coreutils-prog=PROGRAM to determine the program.  The
+     invocation for this case should be:
+       path/to/coreutils --coreutils-prog=someprog someprog ...
+     The third argument is what the program will see as argv[0].  */
+
+  if (argc >= 2)
+    {
+      size_t nskip = 0;
+      char *arg_name = NULL;
+
+      /* If calling coreutils directly, the "script" name isn't passed.
+         Distinguish the two cases with a -shebang suffix.  */
+      if (STRPREFIX (argv[1], "--coreutils-prog="))
+        {
+          nskip = 1;
+          arg_name = prog_name = argv[1] + strlen ("--coreutils-prog=");
+        }
+      else if (STRPREFIX (argv[1], "--coreutils-prog-shebang="))
+        {
+          nskip = 2;
+          prog_name = argv[1] + strlen ("--coreutils-prog-shebang=");
+          if (argc >= 3)
+            arg_name = last_component (argv[2]);
+          else
+            arg_name = prog_name;
+        }
+
+      if (nskip)
+        {
+          argv[nskip] = arg_name; /* XXX: Discards any specified path.  */
+          launch_program (prog_name, argc - nskip, argv + nskip);
+          error (EXIT_FAILURE, 0, _("unknown program %s"),
+                 quote (prog_name));
+        }
+    }
+
+  /* No known program was selected.  From here on, we behave like any other
+     coreutils program.  */
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+  atexit (close_stdout);
+
+  if ((optc = getopt_long (argc, argv, "", long_options, NULL)) != -1)
+    switch (optc)
+      {
+      case_GETOPT_HELP_CHAR;
+
+      case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+      }
+
+  /* Only print the error message when no options have been passed
+     to coreutils.  */
+  if (optind == 1 && prog_name && !STREQ (prog_name, "coreutils"))
+    error (0, 0, _("unknown program %s"),
+           quote (prog_name));
+
+  usage (EXIT_FAILURE);
+}