/***************************************************************************
 * CVSID: $Id$
 *
 * util.c - Various utilities
 *
 * Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
 *
 * Licensed under the Academic Free License version 2.1
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 **************************************************************************/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#include <stdint.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <sys/hexdump.h>

#include <glib.h>
#include <dbus/dbus.h>
#include <dbus/dbus-glib.h>

#include "osspec.h"
#include "logger.h"
#include "hald.h"
#include "hald_runner.h"
#include "hald_dbus.h"
#include "device_info.h"

#include "util.h"

/** Determine whether the given character is valid as the first character
 *  in a name.
 */
#define VALID_INITIAL_NAME_CHARACTER(c)          \
        (((c) >= 'A' && (c) <= 'Z') ||           \
        ((c) >= 'a' && (c) <= 'z') ||            \
        ((c) == '_'))

/** Determine whether the given character is valid as a second or later
 *  character in a name.
 */
#define VALID_NAME_CHARACTER(c)                  \
        (((c) >= '0' && (c) <= '9') ||           \
        ((c) >= 'A' && (c) <= 'Z') ||            \
        ((c) >= 'a' && (c) <= 'z') ||            \
        ((c) == '_'))

gboolean
hal_util_remove_trailing_slash (gchar *path)
{
        gchar *c = NULL;

        if (path == NULL) {
                return FALSE;
        }

        c = strrchr (path, '/');
        if (c == NULL) {
                HAL_WARNING (("Invalid path %s", path));
                return 1;
        }
        if (*(c+1) == '\0')
                *c = '\0';

        return TRUE;
}

/** Given a path, /foo/bar/bat/foobar, return the last element, e.g.
 *  foobar.
 *
 *  @param  path                Path
 *  @return                     Pointer into given string
 */
const gchar *
hal_util_get_last_element (const gchar *s)
{
        int len;
        const gchar *p;

        len = strlen (s);
        for (p = s + len - 1; p > s; --p) {
                if ((*p) == '/')
                        return p + 1;
        }

        return s;
}

/** Given a path, this functions finds the path representing the
 *  parent directory by truncation.
 *
 *  @param  path                Path
 *  @return                     Path for parent or NULL. Must be freed by caller
 */
gchar *
hal_util_get_parent_path (const gchar *path)
{
        guint i;
        guint len;
        gchar *parent_path;

        /* Find parent device by truncating our own path */
        parent_path = g_strndup (path, HAL_PATH_MAX);
        len = strlen (parent_path);
        for (i = len - 1; parent_path[i] != '/'; --i) {
                parent_path[i] = '\0';
        }
        parent_path[i] = '\0';

        return parent_path;
}

gchar *
hal_util_get_normalized_path (const gchar *path1, const gchar *path2)
{
        int len1;
        int len2;
        const gchar *p1;
        const gchar *p2;
        gchar buf[HAL_PATH_MAX];

        len1 = strlen (path1);
        len2 = strlen (path2);

        p1 = path1 + len1;

        p2 = path2;
        while (p2 < path2 + len2 && strncmp (p2, "../", 3) == 0) {
                p2 += 3;

                while (p1 >= path1 && *(--p1)!='/')
                        ;
        }

        if ((p1-path1) < 0) {
                HAL_ERROR (("Could not normalize '%s' and '%s', return 'NULL'", path1, path2));
                return NULL;
        }

        strncpy (buf, path1, (p1-path1));
        buf[p1-path1] = '\0';

        return g_strdup_printf ("%s/%s", buf, p2);
}

gboolean
hal_util_get_int_from_file (const gchar *directory, const gchar *file, gint *result, gint base)
{
        FILE *f;
        char buf[64];
        gchar path[HAL_PATH_MAX];
        gboolean ret;

        f = NULL;
        ret = FALSE;

        g_snprintf (path, sizeof (path), "%s/%s", directory, file);

        f = fopen (path, "rb");
        if (f == NULL) {
                HAL_ERROR (("Cannot open '%s'", path));
                goto out;
        }

        if (fgets (buf, sizeof (buf), f) == NULL) {
                HAL_ERROR (("Cannot read from '%s'", path));
                goto out;
        }

        /* TODO: handle error condition */
        *result = strtol (buf, NULL, base);
        ret = TRUE;

out:
        if (f != NULL)
                fclose (f);

        return ret;
}

gboolean
hal_util_set_int_from_file (HalDevice *d, const gchar *key, const gchar *directory, const gchar *file, gint base)
{
        gint value;
        gboolean ret;

        ret = FALSE;

        if (hal_util_get_int_from_file (directory, file, &value, base))
                ret = hal_device_property_set_int (d, key, value);

        return ret;
}


gboolean
hal_util_get_uint64_from_file (const gchar *directory, const gchar *file, guint64 *result, gint base)
{
        FILE *f;
        char buf[64];
        gchar path[HAL_PATH_MAX];
        gboolean ret;

        f = NULL;
        ret = FALSE;

        g_snprintf (path, sizeof (path), "%s/%s", directory, file);

        f = fopen (path, "rb");
        if (f == NULL) {
                HAL_ERROR (("Cannot open '%s'", path));
                goto out;
        }

        if (fgets (buf, sizeof (buf), f) == NULL) {
                HAL_ERROR (("Cannot read from '%s'", path));
                goto out;
        }

        /* TODO: handle error condition */
        *result = strtoll (buf, NULL, base);

        ret = TRUE;

out:
        if (f != NULL)
                fclose (f);

        return ret;
}

gboolean
hal_util_set_uint64_from_file (HalDevice *d, const gchar *key, const gchar *directory, const gchar *file, gint base)
{
        guint64 value;
        gboolean ret;

        ret = FALSE;

        if (hal_util_get_uint64_from_file (directory, file, &value, base))
                ret = hal_device_property_set_uint64 (d, key, value);

        return ret;
}

gboolean
hal_util_get_bcd2_from_file (const gchar *directory, const gchar *file, gint *result)
{
        FILE *f;
        char buf[64];
        gchar path[HAL_PATH_MAX];
        gboolean ret;
        gint digit;
        gint left, right;
        gboolean passed_white_space;
        gint num_prec;
        gsize len;
        gchar c;
        guint i;

        f = NULL;
        ret = FALSE;

        g_snprintf (path, sizeof (path), "%s/%s", directory, file);

        f = fopen (path, "rb");
        if (f == NULL) {
                HAL_ERROR (("Cannot open '%s'", path));
                goto out;
        }

        if (fgets (buf, sizeof (buf), f) == NULL) {
                HAL_ERROR (("Cannot read from '%s'", path));
                goto out;
        }

        left = 0;
        len = strlen (buf);
        passed_white_space = FALSE;
        for (i = 0; i < len && buf[i] != '.'; i++) {
                if (g_ascii_isspace (buf[i])) {
                        if (passed_white_space)
                                break;
                        else
                                continue;
                }
                passed_white_space = TRUE;
                left *= 16;
                c = buf[i];
                digit = (int) (c - '0');
                left += digit;
        }
        i++;
        right = 0;
        num_prec = 0;
        for (; i < len; i++) {
                if (g_ascii_isspace (buf[i]))
                        break;
                if (num_prec == 2)              /* Only care about two digits
                                                 * of precision */
                        break;
                right *= 16;
                c = buf[i];
                digit = (int) (c - '0');
                right += digit;
                num_prec++;
        }

        for (; num_prec < 2; num_prec++)
                right *= 16;

        *result = left * 256 + (right & 255);
        ret = TRUE;

out:
        if (f != NULL)
                fclose (f);

        return ret;
}

gboolean
hal_util_set_bcd2_from_file (HalDevice *d, const gchar *key, const gchar *directory, const gchar *file)
{
        gint value;
        gboolean ret;

        ret = FALSE;

        if (hal_util_get_bcd2_from_file (directory, file, &value))
                ret = hal_device_property_set_int (d, key, value);

        return ret;
}

gchar *
hal_util_get_string_from_file (const gchar *directory, const gchar *file)
{
        FILE *f;
        static gchar buf[256];
        gchar path[HAL_PATH_MAX];
        gchar *result;
        gsize len;
        gint i;

        f = NULL;
        result = NULL;

        g_snprintf (path, sizeof (path), "%s/%s", directory, file);

        f = fopen (path, "rb");
        if (f == NULL) {
                HAL_ERROR (("Cannot open '%s'", path));
                goto out;
        }

        buf[0] = '\0';
        if (fgets (buf, sizeof (buf), f) == NULL) {
                HAL_ERROR (("Cannot read from '%s'", path));
                goto out;
        }

        len = strlen (buf);
        if (len>0)
                buf[len-1] = '\0';

        /* Clear remaining whitespace */
        for (i = len - 2; i >= 0; --i) {
                if (!g_ascii_isspace (buf[i]))
                        break;
                buf[i] = '\0';
        }

        result = buf;

out:
        if (f != NULL)
                fclose (f);

        return result;
}

gboolean
hal_util_set_string_from_file (HalDevice *d, const gchar *key, const gchar *directory, const gchar *file)
{
        gchar *buf;
        gboolean ret;

        ret = FALSE;

        if ((buf = hal_util_get_string_from_file (directory, file)) != NULL)
                ret = hal_device_property_set_string (d, key, buf);

        return ret;
}

void
hal_util_compute_udi (HalDeviceStore *store, gchar *dst, gsize dstsize, const gchar *format, ...)
{
        guint i;
        va_list args;
        gchar buf[256];

        va_start (args, format);
        g_vsnprintf (buf, sizeof (buf), format, args);
        va_end (args);

        g_strcanon (buf,
                    "/_"
                    "abcdefghijklmnopqrstuvwxyz"
                    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                    "1234567890", '_');

        g_strlcpy (dst, buf, dstsize);
        if (hal_device_store_find (store, dst) == NULL)
                goto out;

        for (i = 0; ; i++) {
                g_snprintf (dst, dstsize, "%s_%d", buf, i);
                if (hal_device_store_find (store, dst) == NULL)
                        goto out;
        }

out:
        ;
}


gboolean
hal_util_path_ascend (gchar *path)
{
        gchar *p;

        if (path == NULL)
                return FALSE;

        p = strrchr (path, '/');
        if (p == NULL)
                return FALSE;

        *p = '\0';
        return TRUE;
}

static gboolean _grep_can_reuse = FALSE;

void
hal_util_grep_discard_existing_data (void)
{
        _grep_can_reuse = FALSE;
}

/** Given a directory and filename, open the file and search for the
 *  first line that starts with the given linestart string. Returns
 *  the rest of the line as a string if found.
 *
 *  @param  directory           Directory, e.g. "/proc/acpi/battery/BAT0"
 *  @param  file                File, e.g. "info"
 *  @param  linestart           Start of line, e.g. "serial number"
 *  @param  reuse               Whether we should reuse the file contents
 *                              if the file is the same; can be cleared
 *                              with hal_util_grep_discard_existing_data()
 *  @return                     NULL if not found, otherwise the remainder
 *                              of the line, e.g. ":           21805" if
 *                              the file /proc/acpi/battery/BAT0 contains
 *                              this line "serial number:           21805"
 *                              The string is only valid until the next
 *                              invocation of this function.
 */
gchar *
hal_util_grep_file (const gchar *directory, const gchar *file, const gchar *linestart, gboolean reuse)
{
        static gchar buf[2048];
        static unsigned int bufsize;
        static gchar filename[HAL_PATH_MAX];
        static gchar oldfilename[HAL_PATH_MAX];
        gchar *result;
        gsize linestart_len;
        gchar *p;

        result = NULL;

        /* TODO: use reuse and _grep_can_reuse parameters to avoid loading
         *       the file again and again
         */

        if (file != NULL && strlen (file) > 0)
                snprintf (filename, sizeof (filename), "%s/%s", directory, file);
        else
                strncpy (filename, directory, sizeof (filename));

        if (_grep_can_reuse && reuse && strcmp (oldfilename, filename) == 0) {
                /* just reuse old file; e.g. bufsize, buf */
                /*HAL_INFO (("hal_util_grep_file: reusing buf for %s", filename));*/
        } else {
                FILE *f;

                f = fopen (filename, "r");
                if (f == NULL)
                        goto out;
                bufsize = fread (buf, sizeof (char), sizeof (buf) - 1, f);
                buf[bufsize] = '\0';
                fclose (f);

                /*HAL_INFO (("hal_util_grep_file: read %s of %d bytes", filename, bufsize));*/
        }

        /* book keeping */
        _grep_can_reuse = TRUE;
        strncpy (oldfilename, filename, sizeof(oldfilename));

        linestart_len = strlen (linestart);

        /* analyze buf */
        p = buf;
        do {
                unsigned int linelen;
                static char line[256];

                for (linelen = 0; p[linelen] != '\n' && p[linelen] != '\0'; linelen++)
                        ;

                if (linelen < sizeof (line)) {

                        strncpy (line, p, linelen);
                        line[linelen] = '\0';

                        if (strncmp (line, linestart, linestart_len) == 0) {
                                result = line + linestart_len;
                                goto out;
                        }
                }

                p += linelen + 1;

        } while (p < buf + bufsize);

out:
        return result;
}

gchar *
hal_util_grep_string_elem_from_file (const gchar *directory, const gchar *file,
                                     const gchar *linestart, guint elem, gboolean reuse)
{
        gchar *line;
        gchar *res;
        static gchar buf[256];
        gchar **tokens;
        guint i, j;

        res = NULL;
        tokens = NULL;

        if (((line = hal_util_grep_file (directory, file, linestart, reuse)) == NULL) || (strlen (line) == 0))
                goto out;

        tokens = g_strsplit_set (line, " \t:", 0);
        for (i = 0, j = 0; tokens[i] != NULL; i++) {
                if (strlen (tokens[i]) == 0)
                        continue;
                if (j == elem) {
                        strncpy (buf, tokens[i], sizeof (buf));
                        res = buf;
                        goto out;
                }
                j++;
        }

out:
        if (tokens != NULL)
                g_strfreev (tokens);

        return res;
}

gint
hal_util_grep_int_elem_from_file (const gchar *directory, const gchar *file,
                                  const gchar *linestart, guint elem, guint base, gboolean reuse)
{
        gchar *endptr;
        gchar *strvalue;
        int value;

        value = G_MAXINT;

        strvalue = hal_util_grep_string_elem_from_file (directory, file, linestart, elem, reuse);
        if (strvalue == NULL)
                goto out;

        value = strtol (strvalue, &endptr, base);
        if (endptr == strvalue) {
                value = G_MAXINT;
                goto out;
        }

out:
        return value;
}

/** Get a string value from a formatted text file and assign it to
 *  a property on a device object.
 *
 *  Example: Given that the file /proc/acpi/battery/BAT0/info contains
 *  the line
 *
 *    "design voltage:          10800 mV"
 *
 *  then hal_util_set_string_elem_from_file (d, "battery.foo",
 *  "/proc/acpi/battery/BAT0", "info", "design voltage", 1) will assign
 *  the string "mV" to the property "battery.foo" on d.
 *
 *  @param  d                   Device object
 *  @param  key                 Property name
 *  @param  directory           Directory, e.g. "/proc/acpi/battery/BAT0"
 *  @param  file                File, e.g. "info"
 *  @param  linestart           Start of line, e.g. "design voltage"
 *  @param  elem                Element number after linestart to extract
 *                              excluding whitespace and ':' characters.
 *  @return                     TRUE, if, and only if, the value could be
 *                              extracted and the property was set
 */
gboolean
hal_util_set_string_elem_from_file (HalDevice *d, const gchar *key,
                                    const gchar *directory, const gchar *file,
                                    const gchar *linestart, guint elem, gboolean reuse)
{
        gboolean res;
        gchar *value;

        res = FALSE;

        if ((value = hal_util_grep_string_elem_from_file (directory, file, linestart, elem, reuse)) == NULL)
                goto out;

        res = hal_device_property_set_string (d, key, value);
out:
        return res;
}

/** Get an integer value from a formatted text file and assign it to
 *  a property on a device object.
 *
 *  Example: Given that the file /proc/acpi/battery/BAT0/info contains
 *  the line
 *
 *    "design voltage:          10800 mV"
 *
 *  then hal_util_set_int_elem_from_file (d, "battery.foo",
 *  "/proc/acpi/battery/BAT0", "info", "design voltage", 0) will assign
 *  the integer 10800 to the property "battery.foo" on d.
 *
 *  @param  d                   Device object
 *  @param  key                 Property name
 *  @param  directory           Directory, e.g. "/proc/acpi/battery/BAT0"
 *  @param  file                File, e.g. "info"
 *  @param  linestart           Start of line, e.g. "design voltage"
 *  @param  elem                Element number after linestart to extract
 *                              excluding whitespace and ':' characters.
 *  @return                     TRUE, if, and only if, the value could be
 *                              extracted and the property was set
 */
gboolean
hal_util_set_int_elem_from_file (HalDevice *d, const gchar *key,
                                 const gchar *directory, const gchar *file,
                                 const gchar *linestart, guint elem, guint base, gboolean reuse)
{
        gchar *endptr;
        gboolean res;
        gchar *strvalue;
        int value;

        res = FALSE;

        strvalue = hal_util_grep_string_elem_from_file (directory, file, linestart, elem, reuse);
        if (strvalue == NULL)
                goto out;

        value = strtol (strvalue, &endptr, base);
        if (endptr == strvalue)
                goto out;

        res = hal_device_property_set_int (d, key, value);

out:
        return res;

}

/** Get a value from a formatted text file, test it against a given
 *  value, and set a boolean property on a device object with the
 *  test result.
 *
 *  Example: Given that the file /proc/acpi/battery/BAT0/info contains
 *  the line
 *
 *    "present:                 yes"
 *
 *  then hal_util_set_bool_elem_from_file (d, "battery.baz",
 *  "/proc/acpi/battery/BAT0", "info", "present", 0, "yes") will assign
 *  the boolean TRUE to the property "battery.baz" on d.
 *
 *  If, instead, the line was
 *
 *    "present:                 no"
 *
 *  the value assigned will be FALSE.
 *
 *  @param  d                   Device object
 *  @param  key                 Property name
 *  @param  directory           Directory, e.g. "/proc/acpi/battery/BAT0"
 *  @param  file                File, e.g. "info"
 *  @param  linestart           Start of line, e.g. "design voltage"
 *  @param  elem                Element number after linestart to extract
 *                              excluding whitespace and ':' characters.
 *  @param  expected            Value to test against
 *  @return                     TRUE, if, and only if, the value could be
 *                              extracted and the property was set
 */
gboolean
hal_util_set_bool_elem_from_file (HalDevice *d, const gchar *key,
                                  const gchar *directory, const gchar *file,
                                  const gchar *linestart, guint elem, const gchar *expected, gboolean reuse)
{
        gchar *line;
        gboolean res;
        gchar **tokens;
        guint i, j;

        res = FALSE;
        tokens = NULL;

        if (((line = hal_util_grep_file (directory, file, linestart, reuse)) == NULL) || (strlen (line) == 0))
                goto out;

        tokens = g_strsplit_set (line, " \t:", 0);

        for (i = 0, j = 0; tokens[i] != NULL; i++) {
                if (strlen (tokens[i]) == 0)
                        continue;
                if (j == elem) {
                        hal_device_property_set_bool (d, key, strcmp (tokens[i], expected) == 0);
                        res = TRUE;
                        goto out;
                }
                j++;
        }


out:
        if (tokens != NULL)
                g_strfreev (tokens);

        return res;
}

gchar **
hal_util_dup_strv_from_g_slist (GSList *strlist)
{
        guint j;
        guint len;
        gchar **strv;
        GSList *i;

        len = g_slist_length (strlist);
        strv = g_new (char *, len + 1);

        for (i = strlist, j = 0; i != NULL; i = g_slist_next (i), j++) {
                strv[j] = g_strdup ((const gchar *) i->data);
        }
        strv[j] = NULL;

        return strv;
}

/* -------------------------------------------------------------------------------------------------------------- */

typedef struct {
        HalDevice *d;
        gchar **programs;
        gchar **extra_env;
        guint next_program;

        HalCalloutsDone callback;
        gpointer userdata1;
        gpointer userdata2;

} Callout;

static void callout_do_next (Callout *c);

static void
callout_terminated (HalDevice *d, guint32 exit_type,
                   gint return_code, gchar **error,
                   gpointer data1, gpointer data2)
{
        Callout *c;

        c = (Callout *) data1;
        callout_do_next (c);
}

static void
callout_do_next (Callout *c)
{

        /* Check if we're done */
        if (c->programs[c->next_program] == NULL) {
                HalDevice *d;
                gpointer userdata1;
                gpointer userdata2;
                HalCalloutsDone callback;

                d = c->d;
                userdata1 = c->userdata1;
                userdata2 = c->userdata2;
                callback = c->callback;

                g_strfreev (c->programs);
                g_strfreev (c->extra_env);
                g_free (c);

                callback (d, userdata1, userdata2);

        } else {
    hald_runner_run(c->d, c->programs[c->next_program], c->extra_env,
                    HAL_HELPER_TIMEOUT, callout_terminated,
                    (gpointer)c, NULL);
                c->next_program++;
        }
}

static void
hal_callout_device (HalDevice *d, HalCalloutsDone callback, gpointer userdata1, gpointer userdata2,
                    GSList *programs, gchar **extra_env)
{
        Callout *c;

        c = g_new0 (Callout, 1);
        c->d = d;
        c->callback = callback;
        c->userdata1 = userdata1;
        c->userdata2 = userdata2;
        c->programs = hal_util_dup_strv_from_g_slist (programs);
        c->extra_env = g_strdupv (extra_env);
        c->next_program = 0;

        callout_do_next (c);
}

void
hal_util_callout_device_add (HalDevice *d, HalCalloutsDone callback, gpointer userdata1, gpointer userdata2)
{
        GSList *programs;
        gchar *extra_env[2] = {"HALD_ACTION=add", NULL};

        if ((programs = hal_device_property_get_strlist (d, "info.callouts.add")) == NULL) {
                callback (d, userdata1, userdata2);
                goto out;
        }

        HAL_INFO (("Add callouts for udi=%s", d->udi));

        hal_callout_device (d, callback, userdata1, userdata2, programs, extra_env);
out:
        ;
}

void
hal_util_callout_device_remove (HalDevice *d, HalCalloutsDone callback, gpointer userdata1, gpointer userdata2)
{
        GSList *programs;
        gchar *extra_env[2] = {"HALD_ACTION=remove", NULL};

        if ((programs = hal_device_property_get_strlist (d, "info.callouts.remove")) == NULL) {
                callback (d, userdata1, userdata2);
                goto out;
        }

        HAL_INFO (("Remove callouts for udi=%s", d->udi));

        hal_callout_device (d, callback, userdata1, userdata2, programs, extra_env);
out:
        ;
}

void
hal_util_callout_device_preprobe (HalDevice *d, HalCalloutsDone callback, gpointer userdata1, gpointer userdata2)
{
        GSList *programs;
        gchar *extra_env[2] = {"HALD_ACTION=preprobe", NULL};

        if ((programs = hal_device_property_get_strlist (d, "info.callouts.preprobe")) == NULL) {
                callback (d, userdata1, userdata2);
                goto out;
        }

        HAL_INFO (("Preprobe callouts for udi=%s", d->udi));

        hal_callout_device (d, callback, userdata1, userdata2, programs, extra_env);
out:
        ;
}

gchar *
hal_util_strdup_valid_utf8 (const char *str)
{
        char *endchar;
        char *newstr;
        unsigned int count = 0;

        if (str == NULL)
                return NULL;

        newstr = g_strdup (str);

        while (!g_utf8_validate (newstr, -1, (const char **) &endchar)) {
                *endchar = '?';
                count++;
        }

        if (strlen(newstr) == count)
                return NULL;
        else
                return newstr;
}

void
hal_util_hexdump (const void *mem, unsigned int size)
{
        (void) printf ("Dumping %d=0x%x bytes\n", size, size);
        (void) hexdump_file(mem, size, HDF_DEFAULT, stdout);
}

gboolean
hal_util_is_mounted_by_hald (const char *mount_point)
{
        int i;
        FILE *hal_mtab;
        int hal_mtab_len;
        int num_read;
        char *hal_mtab_buf;
        char **lines;
        gboolean found;

        hal_mtab = NULL;
        hal_mtab_buf = NULL;
        found = FALSE;

        /*HAL_DEBUG (("examining /media/.hal-mtab for %s", mount_point));*/

        hal_mtab = fopen ("/media/.hal-mtab", "r");
        if (hal_mtab == NULL) {
                HAL_ERROR (("Cannot open /media/.hal-mtab"));
                goto out;
        }
        if (fseek (hal_mtab, 0L, SEEK_END) != 0) {
                HAL_ERROR (("Cannot seek to end of /media/.hal-mtab"));
                goto out;
        }
        hal_mtab_len = ftell (hal_mtab);
        if (hal_mtab_len < 0) {
                HAL_ERROR (("Cannot determine size of /media/.hal-mtab"));
                goto out;
        }
        rewind (hal_mtab);

        hal_mtab_buf = g_new0 (char, hal_mtab_len + 1);
        num_read = fread (hal_mtab_buf, 1, hal_mtab_len, hal_mtab);
        if (num_read != hal_mtab_len) {
                HAL_ERROR (("Cannot read from /media/.hal-mtab"));
                goto out;
        }
        fclose (hal_mtab);
        hal_mtab = NULL;

        /*HAL_DEBUG (("hal_mtab = '%s'\n", hal_mtab_buf));*/

        lines = g_strsplit (hal_mtab_buf, "\n", 0);
        g_free (hal_mtab_buf);
        hal_mtab_buf = NULL;

        /* find the entry we're going to unmount */
        for (i = 0; lines[i] != NULL && !found; i++) {
                char **line_elements;

                /*HAL_DEBUG ((" line = '%s'", lines[i]));*/

                if ((lines[i])[0] == '#')
                        continue;

                line_elements = g_strsplit (lines[i], "\t", 6);
                if (g_strv_length (line_elements) == 6) {
/*
                        HAL_DEBUG (("  devfile     = '%s'", line_elements[0]));
                        HAL_DEBUG (("  uid         = '%s'", line_elements[1]));
                        HAL_DEBUG (("  session id  = '%s'", line_elements[2]));
                        HAL_DEBUG (("  fs          = '%s'", line_elements[3]));
                        HAL_DEBUG (("  options     = '%s'", line_elements[4]));
                        HAL_DEBUG (("  mount_point = '%s'", line_elements[5]));
                        HAL_DEBUG (("  (comparing against '%s')", mount_point));
*/

                        if (strcmp (line_elements[5], mount_point) == 0) {
                                found = TRUE;
                                /*HAL_INFO (("device at '%s' is indeed mounted by HAL's Mount()", mount_point));*/
                        }

                }

                g_strfreev (line_elements);
        }

        g_strfreev (lines);

out:
        if (hal_mtab != NULL)
                fclose (hal_mtab);
        if (hal_mtab_buf != NULL)
                g_free (hal_mtab_buf);

        return found;
}

void
hal_util_branch_claim (HalDeviceStore *store, HalDevice *root, dbus_bool_t claimed,
    const char *service, int uid)
{
        GSList *children;
        GSList *i;
        HalDevice *d;

        if (claimed) {
                hal_device_property_set_bool (root, "info.claimed", claimed);
                hal_device_property_set_string (root, "info.claimed.service", service);
                hal_device_property_set_int (root, "info.claimed.uid", uid);
        } else {
                hal_device_property_remove (root, "info.claimed");
                hal_device_property_remove (root, "info.claimed.service");
                hal_device_property_remove (root, "info.claimed.uid");
        }


        children = hal_device_store_match_multiple_key_value_string (store,
            "info.parent", root->udi);

        for (i = children; i != NULL; i = g_slist_next (i)) {
                d = HAL_DEVICE (i->data);
                hal_util_branch_claim (store, d, claimed, service, uid);
        }

        g_slist_free (children);
}

/** Given an interface name, check if it is valid.
 *  @param  name        A given interface name
 *  @return             TRUE if name is valid, otherwise FALSE
 */
gboolean
is_valid_interface_name(const char *name) {

        const char *end;
        const char *last_dot;

        last_dot = NULL;

        if (strlen(name) == 0)
                return FALSE;

        end = name + strlen(name);

        if (*name == '.')    /* disallow starting with a . */
                return FALSE;
        else if (!VALID_INITIAL_NAME_CHARACTER (*name))
                return FALSE;
        else
                name++;

        while (name != end) {
                if (*name == '.') {
                        if ((name + 1) == end)
                                return FALSE;
                        else if (!VALID_INITIAL_NAME_CHARACTER (*(name + 1)))
                                return FALSE;
                        last_dot = name;
                        name++;    /* we just validated the next char, so skip two */
                } else if (!VALID_NAME_CHARACTER (*name))
                        return FALSE;
                name++;
        }
        if (last_dot == NULL)
                return FALSE;

        return TRUE;
}