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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
*
* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <locale.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include "gdm-common.h"
void
gdm_set_fatal_warnings_if_unstable (void)
{
char **versions;
versions = g_strsplit (VERSION, ".", 3);
if (versions && versions [0] && versions [1]) {
int major;
major = atoi (versions [1]);
if ((major % 2) != 0) {
g_setenv ("G_DEBUG", "fatal_criticals", FALSE);
g_log_set_always_fatal (G_LOG_LEVEL_CRITICAL);
}
}
g_strfreev (versions);
}
int
gdm_signal_pid (int pid,
int signal)
{
int status = -1;
/* perhaps block sigchld */
g_debug ("sending signal %d to process %d", signal, pid);
status = kill (pid, signal);
if (status < 0) {
if (errno == ESRCH) {
g_warning ("Child process %d was already dead.",
(int)pid);
} else {
g_warning ("Couldn't kill child process %d: %s",
pid,
g_strerror (errno));
}
}
/* perhaps unblock sigchld */
return status;
}
/* hex conversion adapted from D-Bus */
/**
* Appends a two-character hex digit to a string, where the hex digit
* has the value of the given byte.
*
* @param str the string
* @param byte the byte
*/
static void
_gdm_string_append_byte_as_hex (GString *str,
int byte)
{
const char hexdigits[16] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'
};
str = g_string_append_c (str, hexdigits[(byte >> 4)]);
str = g_string_append_c (str, hexdigits[(byte & 0x0f)]);
}
/**
* Encodes a string in hex, the way MD5 and SHA-1 are usually
* encoded. (Each byte is two hex digits.)
*
* @param source the string to encode
* @param start byte index to start encoding
* @param dest string where encoded data should be placed
* @param insert_at where to place encoded data
* @returns #TRUE if encoding was successful, #FALSE if no memory etc.
*/
gboolean
gdm_string_hex_encode (const GString *source,
int start,
GString *dest,
int insert_at)
{
GString *result;
const unsigned char *p;
const unsigned char *end;
gboolean retval;
g_assert (start <= source->len);
result = g_string_new (NULL);
retval = FALSE;
p = (const unsigned char*) source->str;
end = p + source->len;
p += start;
while (p != end) {
_gdm_string_append_byte_as_hex (result, *p);
++p;
}
dest = g_string_insert (dest, insert_at, result->str);
retval = TRUE;
g_string_free (result, TRUE);
return retval;
}
/**
* Decodes a string from hex encoding.
*
* @param source the string to decode
* @param start byte index to start decode
* @param end_return return location of the end of the hex data, or #NULL
* @param dest string where decoded data should be placed
* @param insert_at where to place decoded data
* @returns #TRUE if decoding was successful, #FALSE if no memory.
*/
gboolean
gdm_string_hex_decode (const GString *source,
int start,
int *end_return,
GString *dest,
int insert_at)
{
GString *result;
const unsigned char *p;
const unsigned char *end;
gboolean retval;
gboolean high_bits;
g_assert (start <= source->len);
result = g_string_new (NULL);
retval = FALSE;
high_bits = TRUE;
p = (const unsigned char*) source->str;
end = p + source->len;
p += start;
while (p != end) {
unsigned int val;
switch (*p) {
case '0':
val = 0;
break;
case '1':
val = 1;
break;
case '2':
val = 2;
break;
case '3':
val = 3;
break;
case '4':
val = 4;
break;
case '5':
val = 5;
break;
case '6':
val = 6;
break;
case '7':
val = 7;
break;
case '8':
val = 8;
break;
case '9':
val = 9;
break;
case 'a':
case 'A':
val = 10;
break;
case 'b':
case 'B':
val = 11;
break;
case 'c':
case 'C':
val = 12;
break;
case 'd':
case 'D':
val = 13;
break;
case 'e':
case 'E':
val = 14;
break;
case 'f':
case 'F':
val = 15;
break;
default:
goto done;
}
if (high_bits) {
result = g_string_append_c (result, val << 4);
} else {
int len;
unsigned char b;
len = result->len;
b = result->str[len - 1];
b |= val;
result->str[len - 1] = b;
}
high_bits = !high_bits;
++p;
}
done:
dest = g_string_insert (dest, insert_at, result->str);
if (end_return) {
*end_return = p - (const unsigned char*) source->str;
}
retval = TRUE;
g_string_free (result, TRUE);
return retval;
}
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