Adding upstream version 3:4.8.29.upstream/3%4.8.29upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1084 insertions, 0 deletions

diff --git a/src/filemanager/ext.c b/src/filemanager/ext.c
new file mode 100644
index 0000000..3c54747
--- /dev/null
+++ b/src/filemanager/ext.c
@@ -0,0 +1,1084 @@
+/*
+   Extension dependent execution.
+
+   Copyright (C) 1994-2022
+   Free Software Foundation, Inc.
+
+   Written by:
+   Jakub Jelinek, 1995
+   Miguel de Icaza, 1994
+   Slava Zanko <slavazanko@gmail.com>, 2013
+
+   This file is part of the Midnight Commander.
+
+   The Midnight Commander 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.
+
+   The Midnight Commander 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/>.
+ */
+
+/** \file  ext.c
+ *  \brief Source: extension dependent execution
+ */
+
+#include <config.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "lib/global.h"
+#include "lib/tty/tty.h"
+#include "lib/search.h"
+#include "lib/fileloc.h"
+#include "lib/mcconfig.h"
+#include "lib/util.h"
+#include "lib/vfs/vfs.h"
+#include "lib/widget.h"
+#ifdef HAVE_CHARSET
+#include "lib/charsets.h"       /* get_codepage_index */
+#endif
+
+#ifdef USE_FILE_CMD
+#include "src/setup.h"          /* use_file_to_check_type */
+#endif
+#include "src/execute.h"
+#include "src/history.h"
+#include "src/usermenu.h"
+
+#include "src/consaver/cons.saver.h"
+#include "src/viewer/mcviewer.h"
+
+#ifdef HAVE_CHARSET
+#include "src/selcodepage.h"    /* do_set_codepage */
+#endif
+
+#include "filemanager.h"        /* current_panel */
+#include "panel.h"              /* panel_cd */
+
+#include "ext.h"
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+#ifdef USE_FILE_CMD
+#ifdef FILE_B
+#define FILE_CMD "file -z " FILE_B FILE_S FILE_L
+#else
+#define FILE_CMD "file -z " FILE_S FILE_L
+#endif
+#endif
+
+/*** file scope type declarations ****************************************************************/
+
+typedef char *(*quote_func_t) (const char *name, gboolean quote_percent);
+
+/*** file scope variables ************************************************************************/
+
+/* This variable points to a copy of the mc.ext file in memory
+ * With this we avoid loading/parsing the file each time we
+ * need it
+ */
+static mc_config_t *ext_ini = NULL;
+static gchar **ext_ini_groups = NULL;
+static vfs_path_t *localfilecopy_vpath = NULL;
+static char buffer[BUF_1K];
+
+static char *pbuffer = NULL;
+static time_t localmtime = 0;
+static quote_func_t quote_func = name_quote;
+static gboolean run_view = FALSE;
+static gboolean is_cd = FALSE;
+static gboolean written_nonspace = FALSE;
+static gboolean do_local_copy = FALSE;
+
+static const char *descr_group = "mc.ext.ini";
+static const char *default_group = "Default";
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+exec_cleanup_script (vfs_path_t * script_vpath)
+{
+    if (script_vpath != NULL)
+    {
+        (void) mc_unlink (script_vpath);
+        vfs_path_free (script_vpath, TRUE);
+    }
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+exec_cleanup_file_name (const vfs_path_t * filename_vpath, gboolean has_changed)
+{
+    if (localfilecopy_vpath == NULL)
+        return;
+
+    if (has_changed)
+    {
+        struct stat mystat;
+
+        mc_stat (localfilecopy_vpath, &mystat);
+        has_changed = localmtime != mystat.st_mtime;
+    }
+    mc_ungetlocalcopy (filename_vpath, localfilecopy_vpath, has_changed);
+    vfs_path_free (localfilecopy_vpath, TRUE);
+    localfilecopy_vpath = NULL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static char *
+exec_get_file_name (const vfs_path_t * filename_vpath)
+{
+    if (!do_local_copy)
+        return quote_func (vfs_path_get_last_path_str (filename_vpath), FALSE);
+
+    if (localfilecopy_vpath == NULL)
+    {
+        struct stat mystat;
+        localfilecopy_vpath = mc_getlocalcopy (filename_vpath);
+        if (localfilecopy_vpath == NULL)
+            return NULL;
+
+        mc_stat (localfilecopy_vpath, &mystat);
+        localmtime = mystat.st_mtime;
+    }
+
+    return quote_func (vfs_path_get_last_path_str (localfilecopy_vpath), FALSE);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static char *
+exec_expand_format (char symbol, gboolean is_result_quoted)
+{
+    char *text;
+
+    text = expand_format (NULL, symbol, TRUE);
+    if (is_result_quoted && text != NULL)
+    {
+        char *quoted_text;
+
+        quoted_text = g_strdup_printf ("\"%s\"", text);
+        g_free (text);
+        text = quoted_text;
+    }
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static GString *
+exec_get_export_variables (const vfs_path_t * filename_vpath)
+{
+    char *text;
+    GString *export_vars_string;
+    size_t i;
+
+    /* *INDENT-OFF* */
+    struct
+    {
+        const char symbol;
+        const char *name;
+        const gboolean is_result_quoted;
+    } export_variables[] = {
+        {'p', "MC_EXT_BASENAME", FALSE},
+        {'d', "MC_EXT_CURRENTDIR", FALSE},
+        {'s', "MC_EXT_SELECTED", TRUE},
+        {'t', "MC_EXT_ONLYTAGGED", TRUE},
+        {'\0', NULL, FALSE}
+    };
+    /* *INDENT-ON* */
+
+    text = exec_get_file_name (filename_vpath);
+    if (text == NULL)
+        return NULL;
+
+    export_vars_string = g_string_new ("MC_EXT_FILENAME=");
+    g_string_append_printf (export_vars_string, "%s\nexport MC_EXT_FILENAME\n", text);
+    g_free (text);
+
+    for (i = 0; export_variables[i].name != NULL; i++)
+    {
+        text =
+            exec_expand_format (export_variables[i].symbol, export_variables[i].is_result_quoted);
+        if (text != NULL)
+        {
+            g_string_append_printf (export_vars_string,
+                                    "%s=%s\nexport %s\n", export_variables[i].name, text,
+                                    export_variables[i].name);
+            g_free (text);
+        }
+    }
+
+    return export_vars_string;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static GString *
+exec_make_shell_string (const char *lc_data, const vfs_path_t * filename_vpath)
+{
+    GString *shell_string;
+    char lc_prompt[80] = "\0";
+    gboolean parameter_found = FALSE;
+    gboolean expand_prefix_found = FALSE;
+
+    shell_string = g_string_new ("");
+
+    for (; *lc_data != '\0' && *lc_data != '\n'; lc_data++)
+    {
+        if (parameter_found)
+        {
+            if (*lc_data == '}')
+            {
+                char *parameter;
+
+                parameter_found = FALSE;
+                parameter =
+                    input_dialog (_("Parameter"), lc_prompt, MC_HISTORY_EXT_PARAMETER, "",
+                                  INPUT_COMPLETE_NONE);
+                if (parameter == NULL)
+                {
+                    /* User canceled */
+                    g_string_free (shell_string, TRUE);
+                    exec_cleanup_file_name (filename_vpath, FALSE);
+                    return NULL;
+                }
+                g_string_append (shell_string, parameter);
+                written_nonspace = TRUE;
+                g_free (parameter);
+            }
+            else
+            {
+                size_t len = strlen (lc_prompt);
+
+                if (len < sizeof (lc_prompt) - 1)
+                {
+                    lc_prompt[len] = *lc_data;
+                    lc_prompt[len + 1] = '\0';
+                }
+            }
+        }
+        else if (expand_prefix_found)
+        {
+            expand_prefix_found = FALSE;
+            if (*lc_data == '{')
+                parameter_found = TRUE;
+            else
+            {
+                int i;
+
+                i = check_format_view (lc_data);
+                if (i != 0)
+                {
+                    lc_data += i - 1;
+                    run_view = TRUE;
+                }
+                else
+                {
+                    i = check_format_cd (lc_data);
+                    if (i > 0)
+                    {
+                        is_cd = TRUE;
+                        quote_func = fake_name_quote;
+                        do_local_copy = FALSE;
+                        pbuffer = buffer;
+                        lc_data += i - 1;
+                    }
+                    else
+                    {
+                        char *v;
+
+                        i = check_format_var (lc_data, &v);
+                        if (i > 0)
+                        {
+                            g_string_append (shell_string, v);
+                            g_free (v);
+                            lc_data += i;
+                        }
+                        else
+                        {
+                            char *text;
+
+                            if (*lc_data != 'f')
+                                text = expand_format (NULL, *lc_data, !is_cd);
+                            else
+                            {
+                                text = exec_get_file_name (filename_vpath);
+                                if (text == NULL)
+                                {
+                                    g_string_free (shell_string, TRUE);
+                                    return NULL;
+                                }
+                            }
+
+                            if (!is_cd)
+                                g_string_append (shell_string, text);
+                            else
+                            {
+                                strcpy (pbuffer, text);
+                                pbuffer = strchr (pbuffer, 0);
+                            }
+
+                            g_free (text);
+                            written_nonspace = TRUE;
+                        }
+                    }
+                }
+            }
+        }
+        else if (*lc_data == '%')
+            expand_prefix_found = TRUE;
+        else
+        {
+            if (!whitespace (*lc_data))
+                written_nonspace = TRUE;
+            if (is_cd)
+                *(pbuffer++) = *lc_data;
+            else
+                g_string_append_c (shell_string, *lc_data);
+        }
+    }                           /* for */
+
+    return shell_string;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+exec_extension_view (void *target, char *cmd, const vfs_path_t * filename_vpath, int start_line)
+{
+    mcview_mode_flags_t def_flags = {
+        /* *INDENT-OFF* */
+        .wrap = FALSE,
+        .hex = mcview_global_flags.hex,
+        .magic = FALSE,
+        .nroff = mcview_global_flags.nroff
+        /* *INDENT-ON* */
+    };
+
+    mcview_mode_flags_t changed_flags;
+
+    mcview_clear_mode_flags (&changed_flags);
+    mcview_altered_flags.hex = FALSE;
+    mcview_altered_flags.nroff = FALSE;
+    if (def_flags.hex != mcview_global_flags.hex)
+        changed_flags.hex = TRUE;
+    if (def_flags.nroff != mcview_global_flags.nroff)
+        changed_flags.nroff = TRUE;
+
+    if (target == NULL)
+        mcview_viewer (cmd, filename_vpath, start_line, 0, 0);
+    else
+        mcview_load ((WView *) target, cmd, vfs_path_as_str (filename_vpath), start_line, 0, 0);
+
+    if (changed_flags.hex && !mcview_altered_flags.hex)
+        mcview_global_flags.hex = def_flags.hex;
+    if (changed_flags.nroff && !mcview_altered_flags.nroff)
+        mcview_global_flags.nroff = def_flags.nroff;
+
+    dialog_switch_process_pending ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+exec_extension_cd (WPanel * panel)
+{
+    char *q;
+    vfs_path_t *p_vpath;
+
+    *pbuffer = '\0';
+    pbuffer = buffer;
+    /* Search last non-space character. Start search at the end in order
+       not to short filenames containing spaces. */
+    q = pbuffer + strlen (pbuffer) - 1;
+    while (q >= pbuffer && whitespace (*q))
+        q--;
+    q[1] = 0;
+
+    p_vpath = vfs_path_from_str_flags (pbuffer, VPF_NO_CANON);
+    panel_cd (panel, p_vpath, cd_parse_command);
+    vfs_path_free (p_vpath, TRUE);
+}
+
+
+/* --------------------------------------------------------------------------------------------- */
+
+static vfs_path_t *
+exec_extension (WPanel * panel, void *target, const vfs_path_t * filename_vpath,
+                const char *lc_data, int start_line)
+{
+    GString *shell_string, *export_variables;
+    vfs_path_t *script_vpath = NULL;
+    int cmd_file_fd;
+    FILE *cmd_file;
+    char *cmd = NULL;
+
+    pbuffer = NULL;
+    localmtime = 0;
+    quote_func = name_quote;
+    run_view = FALSE;
+    is_cd = FALSE;
+    written_nonspace = FALSE;
+
+    /* Avoid making a local copy if we are doing a cd */
+    do_local_copy = !vfs_file_is_local (filename_vpath);
+
+    shell_string = exec_make_shell_string (lc_data, filename_vpath);
+    if (shell_string == NULL)
+        goto ret;
+
+    if (is_cd)
+    {
+        exec_extension_cd (panel);
+        g_string_free (shell_string, TRUE);
+        goto ret;
+    }
+
+    /*
+     * All commands should be run in /bin/sh regardless of user shell.
+     * To do that, create temporary shell script and run it.
+     * Sometimes it's not needed (e.g. for %cd and %view commands),
+     * but it's easier to create it anyway.
+     */
+    cmd_file_fd = mc_mkstemps (&script_vpath, "mcext", SCRIPT_SUFFIX);
+
+    if (cmd_file_fd == -1)
+    {
+        message (D_ERROR, MSG_ERROR,
+                 _("Cannot create temporary command file\n%s"), unix_error_string (errno));
+        g_string_free (shell_string, TRUE);
+        goto ret;
+    }
+
+    cmd_file = fdopen (cmd_file_fd, "w");
+    fputs ("#! /bin/sh\n\n", cmd_file);
+
+    export_variables = exec_get_export_variables (filename_vpath);
+    if (export_variables != NULL)
+    {
+        fputs (export_variables->str, cmd_file);
+        g_string_free (export_variables, TRUE);
+    }
+
+    fputs (shell_string->str, cmd_file);
+    g_string_free (shell_string, TRUE);
+
+    /*
+     * Make the script remove itself when it finishes.
+     * Don't do it for the viewer - it may need to rerun the script,
+     * so we clean up after calling view().
+     */
+    if (!run_view)
+        fprintf (cmd_file, "\n/bin/rm -f %s\n", vfs_path_as_str (script_vpath));
+
+    fclose (cmd_file);
+
+    if ((run_view && !written_nonspace) || is_cd)
+    {
+        exec_cleanup_script (script_vpath);
+        script_vpath = NULL;
+    }
+    else
+    {
+        /* Set executable flag on the command file ... */
+        mc_chmod (script_vpath, S_IRWXU);
+        /* ... but don't rely on it - run /bin/sh explicitly */
+        cmd = g_strconcat ("/bin/sh ", vfs_path_as_str (script_vpath), (char *) NULL);
+    }
+
+    if (run_view)
+    {
+        /* If we've written whitespace only, then just load filename into view */
+        if (!written_nonspace)
+            exec_extension_view (target, NULL, filename_vpath, start_line);
+        else
+            exec_extension_view (target, cmd, filename_vpath, start_line);
+    }
+    else
+    {
+        shell_execute (cmd, EXECUTE_INTERNAL);
+        if (mc_global.tty.console_flag != '\0')
+        {
+            handle_console (CONSOLE_SAVE);
+            if (output_lines != 0 && mc_global.keybar_visible)
+            {
+                unsigned char end_line;
+
+                end_line = LINES - (mc_global.keybar_visible ? 1 : 0) - 1;
+                show_console_contents (output_start_y, end_line - output_lines, end_line);
+            }
+        }
+    }
+
+    g_free (cmd);
+
+    exec_cleanup_file_name (filename_vpath, TRUE);
+  ret:
+    return script_vpath;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Run cmd_file with args, put result into buf.
+ * If error, put '\0' into buf[0]
+ * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
+ *
+ * NOTES: buf is null-terminated string.
+ */
+
+#ifdef USE_FILE_CMD
+static int
+get_popen_information (const char *cmd_file, const char *args, char *buf, int buflen)
+{
+    gboolean read_bytes = FALSE;
+    char *command;
+    FILE *f;
+
+    command = g_strconcat (cmd_file, args, " 2>/dev/null", (char *) NULL);
+    f = popen (command, "r");
+    g_free (command);
+
+    if (f != NULL)
+    {
+#ifdef __QNXNTO__
+        if (setvbuf (f, NULL, _IOFBF, 0) != 0)
+        {
+            (void) pclose (f);
+            return -1;
+        }
+#endif
+        read_bytes = (fgets (buf, buflen, f) != NULL);
+        if (!read_bytes)
+            buf[0] = '\0';      /* Paranoid termination */
+        pclose (f);
+    }
+    else
+    {
+        buf[0] = '\0';          /* Paranoid termination */
+        return -1;
+    }
+
+    buf[buflen - 1] = '\0';
+
+    return read_bytes ? 1 : 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Run the "file" command on the local file.
+ * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
+ */
+
+static int
+get_file_type_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
+{
+    char *tmp;
+    int ret;
+
+    tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), FALSE);
+    ret = get_popen_information (FILE_CMD, tmp, buf, buflen);
+    g_free (tmp);
+
+    return ret;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Run the "enca" command on the local file.
+ * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
+ */
+
+#ifdef HAVE_CHARSET
+static int
+get_file_encoding_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
+{
+    char *tmp, *lang, *args;
+    int ret;
+
+    tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), FALSE);
+    lang = name_quote (autodetect_codeset, FALSE);
+    args = g_strconcat (" -L", lang, " -i ", tmp, (char *) NULL);
+
+    ret = get_popen_information ("enca", args, buf, buflen);
+
+    g_free (args);
+    g_free (lang);
+    g_free (tmp);
+
+    return ret;
+}
+#endif /* HAVE_CHARSET */
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Invoke the "file" command on the file and match its output against PTR.
+ * have_type is a flag that is set if we already have tried to determine
+ * the type of that file.
+ * Return TRUE for match, FALSE otherwise.
+ */
+
+static gboolean
+regex_check_type (const vfs_path_t * filename_vpath, const char *ptr, gboolean case_insense,
+                  gboolean * have_type, GError ** mcerror)
+{
+    gboolean found = FALSE;
+
+    /* Following variables are valid if *have_type is TRUE */
+    static char content_string[2048];
+    static size_t content_shift = 0;
+    static int got_data = 0;
+
+    mc_return_val_if_error (mcerror, FALSE);
+
+    if (!*have_type)
+    {
+        vfs_path_t *localfile_vpath;
+
+#ifdef HAVE_CHARSET
+        static char encoding_id[21];    /* CSISO51INISCYRILLIC -- 20 */
+        int got_encoding_data;
+#endif /* HAVE_CHARSET */
+
+        /* Don't repeate even unsuccessful checks */
+        *have_type = TRUE;
+
+        localfile_vpath = mc_getlocalcopy (filename_vpath);
+        if (localfile_vpath == NULL)
+        {
+            mc_propagate_error (mcerror, 0, _("Cannot fetch a local copy of %s"),
+                                vfs_path_as_str (filename_vpath));
+            return FALSE;
+        }
+
+
+#ifdef HAVE_CHARSET
+        got_encoding_data = is_autodetect_codeset_enabled
+            ? get_file_encoding_local (localfile_vpath, encoding_id, sizeof (encoding_id)) : 0;
+
+        if (got_encoding_data > 0)
+        {
+            char *pp;
+            int cp_id;
+
+            pp = strchr (encoding_id, '\n');
+            if (pp != NULL)
+                *pp = '\0';
+
+            cp_id = get_codepage_index (encoding_id);
+            if (cp_id == -1)
+                cp_id = default_source_codepage;
+
+            do_set_codepage (cp_id);
+        }
+#endif /* HAVE_CHARSET */
+
+        got_data = get_file_type_local (localfile_vpath, content_string, sizeof (content_string));
+
+        mc_ungetlocalcopy (filename_vpath, localfile_vpath, FALSE);
+
+        if (got_data > 0)
+        {
+            char *pp;
+
+            pp = strchr (content_string, '\n');
+            if (pp != NULL)
+                *pp = '\0';
+
+#ifndef FILE_B
+            {
+                const char *real_name;  /* name used with "file" */
+                size_t real_len;
+
+                real_name = vfs_path_get_last_path_str (localfile_vpath);
+                real_len = strlen (real_name);
+
+                if (strncmp (content_string, real_name, real_len) == 0)
+                {
+                    /* Skip "real_name: " */
+                    content_shift = real_len;
+
+                    /* Solaris' file prints tab(s) after ':' */
+                    if (content_string[content_shift] == ':')
+                        for (content_shift++; whitespace (content_string[content_shift]);
+                             content_shift++)
+                            ;
+                }
+            }
+#endif /* FILE_B */
+        }
+        else
+        {
+            /* No data */
+            content_string[0] = '\0';
+        }
+        vfs_path_free (localfile_vpath, TRUE);
+    }
+
+    if (got_data == -1)
+    {
+        mc_propagate_error (mcerror, 0, "%s", _("Pipe failed"));
+        return FALSE;
+    }
+
+    if (content_string[0] != '\0')
+    {
+        mc_search_t *search;
+
+        search = mc_search_new (ptr, DEFAULT_CHARSET);
+        if (search != NULL)
+        {
+            search->search_type = MC_SEARCH_T_REGEX;
+            search->is_case_sensitive = !case_insense;
+            found = mc_search_run (search, content_string + content_shift, 0, -1, NULL);
+            mc_search_free (search);
+        }
+        else
+        {
+            mc_propagate_error (mcerror, 0, "%s", _("Regular expression error"));
+        }
+    }
+
+    return found;
+}
+#endif /* USE_FILE_CMD */
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+check_old_extension_file (void)
+{
+    char *extension_old_file;
+
+    extension_old_file = mc_config_get_full_path (MC_EXT_OLD_FILE);
+    if (exist_file (extension_old_file))
+        message (D_ERROR, _("Warning"),
+                 _("You have an outdated %s file.\nMidnight Commander now uses %s file.\n"
+                   "Please copy your modifications of the old file to the new one."),
+                 extension_old_file, MC_EXT_FILE);
+    g_free (extension_old_file);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static gboolean
+load_extension_file (void)
+{
+    char *extension_file;
+    gboolean mc_user_ext = TRUE;
+    gboolean home_error = FALSE;
+
+    extension_file = mc_config_get_full_path (MC_EXT_FILE);
+    if (!exist_file (extension_file))
+    {
+        g_free (extension_file);
+
+        check_old_extension_file ();
+
+      check_stock_mc_ext:
+        extension_file = mc_build_filename (mc_global.sysconfig_dir, MC_EXT_FILE, (char *) NULL);
+        if (!exist_file (extension_file))
+        {
+            g_free (extension_file);
+            extension_file =
+                mc_build_filename (mc_global.share_data_dir, MC_EXT_FILE, (char *) NULL);
+            if (!exist_file (extension_file))
+                MC_PTR_FREE (extension_file);
+        }
+        mc_user_ext = FALSE;
+    }
+
+    if (extension_file != NULL)
+    {
+        ext_ini = mc_config_init (extension_file, TRUE);
+        g_free (extension_file);
+    }
+    if (ext_ini == NULL)
+        return FALSE;
+
+    /* Check version */
+    if (!mc_config_has_group (ext_ini, descr_group))
+    {
+        flush_extension_file ();
+
+        if (!mc_user_ext)
+        {
+            char *title;
+
+            title = g_strdup_printf (_(" %s%s file error"), mc_global.sysconfig_dir, MC_EXT_FILE);
+            message (D_ERROR, title,
+                     _("The format of the %s%s file has changed with version 4.0. "
+                       "It seems that the installation has failed. Please fetch a fresh copy "
+                       "from the Midnight Commander package."),
+                     mc_global.sysconfig_dir, MC_EXT_FILE);
+            g_free (title);
+            return FALSE;
+        }
+
+        home_error = TRUE;
+        goto check_stock_mc_ext;
+    }
+
+    if (home_error)
+    {
+        char *title;
+
+        extension_file = mc_config_get_full_path (MC_EXT_FILE);
+        title = g_strdup_printf (_("%s file error"), extension_file);
+        message (D_ERROR, title,
+                 _("The format of the %s file has changed with version 4.0. You may either want "
+                   "to copy it from %s%s or use that file as an example of how to write it."),
+                 extension_file, mc_global.sysconfig_dir, MC_EXT_FILE);
+        g_free (extension_file);
+        g_free (title);
+    }
+
+    return TRUE;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+void
+flush_extension_file (void)
+{
+    g_strfreev (ext_ini_groups);
+    ext_ini_groups = NULL;
+
+    mc_config_deinit (ext_ini);
+    ext_ini = NULL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * The second argument is action, i.e. Open, View or Edit
+ * Use target object to open file in.
+ *
+ * This function returns:
+ *
+ * -1 for a failure or user interrupt
+ * 0 if no command was run
+ * 1 if some command was run
+ *
+ * If action == "View" then a parameter is checked in the form of "View:%d",
+ * if the value for %d exists, then the viewer is started up at that line number.
+ */
+
+int
+regex_command_for (void *target, const vfs_path_t * filename_vpath, const char *action,
+                   vfs_path_t ** script_vpath)
+{
+    const char *filename;
+    size_t filename_len;
+    gboolean found = FALSE;
+    gboolean error_flag = FALSE;
+    int ret = 0;
+    struct stat mystat;
+    int view_at_line_number = 0;
+#ifdef USE_FILE_CMD
+    gboolean have_type = FALSE; /* Flag used by regex_check_type() */
+#endif
+    char **group_iter;
+    char *include_group = NULL;
+    const char *current_group;
+
+    if (filename_vpath == NULL)
+        return 0;
+
+    if (script_vpath != NULL)
+        *script_vpath = NULL;
+
+    /* Check for the special View:%d parameter */
+    if (strncmp (action, "View:", 5) == 0)
+    {
+        view_at_line_number = atoi (action + 5);
+        action = "View";
+    }
+
+    if (ext_ini == NULL && !load_extension_file ())
+        return 0;
+
+    mc_stat (filename_vpath, &mystat);
+
+    filename = vfs_path_get_last_path_str (filename_vpath);
+    filename = x_basename (filename);
+    filename_len = strlen (filename);
+
+    if (ext_ini_groups == NULL)
+        ext_ini_groups = mc_config_get_groups (ext_ini, NULL);
+
+    /* find matched type, regex or shell pattern */
+    for (group_iter = ext_ini_groups; *group_iter != NULL && !found; group_iter++)
+    {
+        enum
+        {
+            TYPE_UNUSED,
+            TYPE_NOT_FOUND,
+            TYPE_FOUND
+        } type_state = TYPE_UNUSED;
+
+        const gchar *g = *group_iter;
+        gchar *pattern;
+        gboolean ignore_case;
+
+        if (strcmp (g, descr_group) == 0 || strncmp (g, "Include/", 8) == 0
+            || strcmp (g, default_group) == 0)
+            continue;
+
+        /* The "Directory" parameter is a special case: if it's present then
+           "Type", "Regex", and "Shell" parameters are ignored */
+        pattern = mc_config_get_string_raw (ext_ini, g, "Directory", NULL);
+        if (pattern != NULL)
+        {
+            found = S_ISDIR (mystat.st_mode)
+                && mc_search (pattern, DEFAULT_CHARSET, vfs_path_as_str (filename_vpath),
+                              MC_SEARCH_T_REGEX);
+            g_free (pattern);
+
+            continue;           /* stop if found */
+        }
+
+#ifdef USE_FILE_CMD
+        if (use_file_to_check_type)
+        {
+            pattern = mc_config_get_string_raw (ext_ini, g, "Type", NULL);
+            if (pattern != NULL)
+            {
+                GError *mcerror = NULL;
+
+                ignore_case = mc_config_get_bool (ext_ini, g, "TypeIgnoreCase", FALSE);
+                type_state =
+                    regex_check_type (filename_vpath, pattern, ignore_case, &have_type, &mcerror)
+                    ? TYPE_FOUND : TYPE_NOT_FOUND;
+                g_free (pattern);
+
+                if (mc_error_message (&mcerror, NULL))
+                    error_flag = TRUE;  /* leave it if file cannot be opened */
+
+                if (type_state == TYPE_NOT_FOUND)
+                    continue;
+            }
+        }
+#endif /* USE_FILE_CMD */
+
+        pattern = mc_config_get_string_raw (ext_ini, g, "Regex", NULL);
+        if (pattern != NULL)
+        {
+            mc_search_t *search;
+
+            ignore_case = mc_config_get_bool (ext_ini, g, "RegexIgnoreCase", FALSE);
+            search = mc_search_new (pattern, DEFAULT_CHARSET);
+            g_free (pattern);
+
+            if (search != NULL)
+            {
+                search->search_type = MC_SEARCH_T_REGEX;
+                search->is_case_sensitive = !ignore_case;
+                found = mc_search_run (search, filename, 0, filename_len, NULL);
+                mc_search_free (search);
+            }
+
+            found = found && (type_state == TYPE_UNUSED || type_state == TYPE_FOUND);
+        }
+        else
+        {
+            pattern = mc_config_get_string_raw (ext_ini, g, "Shell", NULL);
+            if (pattern != NULL)
+            {
+                int (*cmp_func) (const char *s1, const char *s2, size_t n);
+                size_t pattern_len;
+
+                ignore_case = mc_config_get_bool (ext_ini, g, "ShellIgnoreCase", FALSE);
+                cmp_func = ignore_case ? strncasecmp : strncmp;
+                pattern_len = strlen (pattern);
+
+                if (*pattern == '.' && filename_len >= pattern_len)
+                    found =
+                        cmp_func (pattern, filename + filename_len - pattern_len, pattern_len) == 0;
+                else
+                    found = pattern_len == filename_len
+                        && cmp_func (pattern, filename, filename_len) == 0;
+
+                g_free (pattern);
+
+                found = found && (type_state == TYPE_UNUSED || type_state == TYPE_FOUND);
+            }
+            else
+                found = type_state == TYPE_FOUND;
+        }
+    }
+
+    /* group is found, process actions */
+    if (found)
+    {
+        char *include_value;
+
+        group_iter--;
+
+        /* "Include" parameter has the highest priority over any actions */
+        include_value = mc_config_get_string_raw (ext_ini, *group_iter, "Include", NULL);
+        if (include_value != NULL)
+        {
+            /* find "Include/include_value" group */
+            include_group = g_strconcat ("Include/", include_value, (char *) NULL);
+            g_free (include_value);
+            found = mc_config_has_group (ext_ini, include_group);
+        }
+    }
+
+    if (found)
+        current_group = include_group != NULL ? include_group : *group_iter;
+    else
+    {
+        current_group = default_group;
+        found = mc_config_has_group (ext_ini, current_group);
+    }
+
+    if (found && !error_flag)
+    {
+        gchar *action_value;
+
+        action_value = mc_config_get_string_raw (ext_ini, current_group, action, NULL);
+        /* Empty commands just stop searching through, they don't do anything  */
+        if (action_value != NULL && *action_value != '\0')
+        {
+            vfs_path_t *sv;
+
+            sv = exec_extension (current_panel, target, filename_vpath, action_value,
+                                 view_at_line_number);
+            if (script_vpath != NULL)
+                *script_vpath = sv;
+            else
+                exec_cleanup_script (sv);
+
+            ret = 1;
+        }
+
+        g_free (action_value);
+    }
+
+    g_free (include_group);
+
+    return (error_flag ? -1 : ret);
+}
+
+/* --------------------------------------------------------------------------------------------- */