/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
*
* 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/>.
*/
#include "mds-colour.h"
/* TODO reload settings on SIGUSR2 */
/* TODO --save-changes */
#include <libmdsserver/macros.h>
#include <libmdsserver/util.h>
#include <libmdsserver/mds-message.h>
#include <libmdsserver/hash-list.h>
#include <libmdsserver/hash-help.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define reconnect_to_display() -1
#define MDS_COLOUR_VARS_VERSION 0
/**
* This variable should declared by the actual server implementation.
* It must be configured before `main` is invoked.
*
* This tells the server-base how to behave
*/
server_characteristics_t server_characteristics =
{
.require_privileges = 0,
.require_display = 1,
.require_respawn_info = 0,
.sanity_check_argc = 1,
.fork_for_safety = 0,
.danger_is_deadly = 0
};
/**
* Value of the ‘Message ID’ header for the next message
*/
static uint32_t message_id = 1;
/**
* Buffer for received messages
*/
static mds_message_t received;
/**
* Whether the server is connected to the display
*/
static int connected = 1;
/**
* Buffer for sending messages
*/
static char* send_buffer = NULL;
/**
* The size allocated to `send_buffer` divided by `sizeof(char)`
*/
static size_t send_buffer_size = 0;
/**
* List of all colours
*/
static colour_list_t colours;
/**
* Textual list of all colours that can be sent
* to clients upon query. This list only includes names.
*/
static char* colour_list_buffer_without_values = NULL;
/**
* Textual list of all colours that can be sent
* to clients upon query. This list include value.
*/
static char* colour_list_buffer_with_values = NULL;
/**
* The length of the message in `colour_list_buffer_without_values`
* assuming it is not `NULL`, if it is `NULL` this variable has no
* meaning and is not guaranteed to be zero.
*/
static size_t colour_list_buffer_without_values_length = 0;
/**
* The length of the message in `colour_list_buffer_with_values`
* assuming it is not `NULL`, if it is `NULL` this variable has no
* meaning and is not guaranteed to be zero.
*/
static size_t colour_list_buffer_with_values_length = 0;
/**
* Send a full message even if interrupted
*
* @param message:const char* The message to send
* @param length:size_t The length of the message
* @return :int Zero on success, -1 on error
*/
#define full_send(message, length) \
((full_send)(socket_fd, message, length))
/**
* Send an error message, message ID will be incremented
*
* @param recv_client_id:const char* The client ID attached on the message that was received,
* must not be `NULL`
* @param recv_message_id:const char* The message ID attached on the message that was received,
* must not be `NULL`
* @param recv_command:const char* The value of the `Command`-header on the message that was
* received, must not be `NULL`
* @param custom:int Non-zero if the error is a custom error
* @param errnum:int The error number, `errno` should be used if the error
* is not a custom error, zero should be used on success,
* a negative integer, such as -1, indicates that the error
* message should not include an error number,
* it is not allowed to have this value be negative and
* `custom` be zero at the same time
* @param message:const char* The description of the error, the line feed at the end
* is added automatically, `NULL` if the description should
* be omitted
* @return Zero on success, -1 on error
*/
#define send_error(recv_client_id, recv_message_id, recv_command, custom, errnum, message) \
((send_error)(recv_client_id, recv_message_id, recv_command, custom, errnum, \
message, &send_buffer, &send_buffer_size, message_id, socket_fd) \
? -1 : ((message_id = message_id == INT32_MAX ? 0 : (message_id + 1)), 0))
/**
* This function will be invoked before `initialise_server` (if not re-exec:ing)
* or before `unmarshal_server` (if re-exec:ing)
*
* @return Non-zero on error
*/
int __attribute__((const)) preinitialise_server(void)
{
return 0;
}
/**
* This function should initialise the server,
* and it not invoked after a re-exec.
*
* @return Non-zero on error
*/
int initialise_server(void)
{
int stage = 0;
const char* const message =
"Command: intercept\n"
"Message ID: 0\n"
"Length: 62\n"
"\n"
"Command: list-colours\n"
"Command: get-colour\n"
"Command: set-colour\n";
fail_if (full_send(message, strlen(message)));
fail_if (server_initialised() < 0); stage++;;
fail_if (colour_list_create(&colours, 64) < 0); stage++;
fail_if (mds_message_initialise(&received));
return 0;
fail:
xperror(*argv);
if (stage >= 2) colour_list_destroy(&colours);
if (stage >= 1) mds_message_destroy(&received);
return 1;
}
/**
* This function will be invoked after `initialise_server` (if not re-exec:ing)
* or after `unmarshal_server` (if re-exec:ing)
*
* @return Non-zero on error
*/
int postinitialise_server(void)
{
colours.freer = colour_list_entry_free;
colours.hasher = string_hash;
if (connected)
return 0;
fail_if (reconnect_to_display());
connected = 1;
return 0;
fail:
mds_message_destroy(&received);
return 1;
}
/**
* Calculate the number of bytes that will be stored by `marshal_server`
*
* On failure the program should `abort()` or exit by other means.
* However it should not be possible for this function to fail.
*
* @return The number of bytes that will be stored by `marshal_server`
*/
size_t marshal_server_size(void)
{
size_t rc = 2 * sizeof(int) + sizeof(uint32_t);
rc += mds_message_marshal_size(&received);
rc += colour_list_marshal_size(&colours);
return rc;
}
/**
* Marshal server implementation specific data into a buffer
*
* @param state_buf The buffer for the marshalled data
* @return Non-zero on error
*/
int marshal_server(char* state_buf)
{
buf_set_next(state_buf, int, MDS_COLOUR_VARS_VERSION);
buf_set_next(state_buf, int, connected);
buf_set_next(state_buf, uint32_t, message_id);
mds_message_marshal(&received, state_buf);
state_buf += mds_message_marshal_size(&received) / sizeof(char*);
colour_list_marshal(&colours, state_buf);
mds_message_destroy(&received);
colour_list_destroy(&colours);
return 0;
}
/**
* Unmarshal server implementation specific data and update the servers state accordingly
*
* On critical failure the program should `abort()` or exit by other means.
* That is, do not let `reexec_failure_recover` run successfully, if it unrecoverable
* error has occurred or one severe enough that it is better to simply respawn.
*
* @param state_buf The marshalled data that as not been read already
* @return Non-zero on error
*/
int unmarshal_server(char* state_buf)
{
int stage = 0;
/* buf_get_next(state_buf, int, MDS_COLOUR_VARS_VERSION); */
buf_next(state_buf, int, 1);
buf_get_next(state_buf, int, connected);
buf_get_next(state_buf, uint32_t, message_id);
fail_if (mds_message_unmarshal(&received, state_buf));
state_buf += mds_message_marshal_size(&received) / sizeof(char*);
stage++;
fail_if (colour_list_unmarshal(&colours, state_buf));
return 0;
fail:
xperror(*argv);
if (stage >= 0) mds_message_destroy(&received);
if (stage >= 1) colour_list_destroy(&colours);
return -1;
}
/**
* Attempt to recover from a re-exec failure that has been
* detected after the server successfully updated it execution image
*
* @return Non-zero on error
*/
int __attribute__((const)) reexec_failure_recover(void)
{
return -1;
}
/**
* Perform the server's mission
*
* @return Non-zero on error
*/
int master_loop(void)
{
int rc = 1, r;
while (!reexecing && !terminating)
{
if (danger)
{
danger = 0;
free(send_buffer), send_buffer = NULL;
send_buffer_size = 0;
colour_list_pack(&colours);
free(colour_list_buffer_without_values),
colour_list_buffer_without_values = NULL;
free(colour_list_buffer_with_values),
colour_list_buffer_with_values = NULL;
}
if (r = mds_message_read(&received, socket_fd), r == 0)
if (r = handle_message(), r == 0)
continue;
if (r == -2)
{
eprint("corrupt message received, aborting.");
goto done;
}
else if (errno == EINTR)
continue;
else
fail_if (errno != ECONNRESET);
eprint("lost connection to server.");
mds_message_destroy(&received);
mds_message_initialise(&received);
connected = 0;
fail_if (reconnect_to_display());
connected = 1;
}
rc = 0;
goto done;
fail:
xperror(*argv);
done:
if (rc || !reexecing)
{
mds_message_destroy(&received);
colour_list_destroy(&colours);
}
free(send_buffer);
free(colour_list_buffer_without_values);
free(colour_list_buffer_with_values);
return rc;
}
/**
* Handle the received message
*
* @return Zero on success, -1 on error
*/
int handle_message(void)
{
const char* recv_command = NULL;
const char* recv_client_id = "0:0";
const char* recv_message_id = NULL;
const char* recv_include_values = NULL;
const char* recv_name = NULL;
const char* recv_remove = NULL;
const char* recv_bytes = NULL;
const char* recv_red = NULL;
const char* recv_green = NULL;
const char* recv_blue = NULL;
size_t i;
#define __get_header(storage, header) \
(startswith(received.headers[i], header)) \
storage = received.headers[i] + strlen(header)
for (i = 0; i < received.header_count; i++)
{
if __get_header(recv_command, "Command: ");
else if __get_header(recv_client_id, "Client ID: ");
else if __get_header(recv_message_id, "Message ID: ");
else if __get_header(recv_include_values, "Include values: ");
else if __get_header(recv_name, "Name: ");
else if __get_header(recv_remove, "Remove: ");
else if __get_header(recv_bytes, "Bytes: ");
else if __get_header(recv_red, "Red: ");
else if __get_header(recv_green, "Green: ");
else if __get_header(recv_blue, "Blue: ");
}
#undef __get_header
if (recv_message_id == NULL)
{
eprint("received message without ID, ignoring, master server is misbehaving.");
return 0;
}
if (recv_command == NULL)
return 0; /* How did that get here, not matter, just ignore it? */
#define t(expr) do { fail_if (expr); return 0; } while (0)
if (strequals(recv_command, "list-colours"))
t (handle_list_colours(recv_client_id, recv_message_id, recv_include_values));
if (strequals(recv_command, "get-colour"))
t (handle_get_colour(recv_client_id, recv_message_id, recv_name));
if (strequals(recv_command, "set-colour"))
t (handle_set_colour(recv_name, recv_remove, recv_bytes, recv_red, recv_green, recv_blue));
#undef t
return 0; /* How did that get here, not matter, just ignore it? */
fail:
return -1;
}
/**
* Create a textual list of all colours that can be sent
* to clients upon query. This list will only include names,
* and will be stored as `colour_list_buffer_without_values`.
*
* @return Zero on success, -1 on error
*/
static int create_colour_list_buffer_without_values(void)
{
size_t i, length = 1;
colour_list_entry_t* entry;
char* temp;
int saved_errno;
foreach_hash_list_entry (colours, i, entry)
length += strlen(entry->key) + 1;
fail_if (yrealloc(temp, colour_list_buffer_without_values, length, char));
temp = colour_list_buffer_without_values;
colour_list_buffer_without_values_length = length - 1;
*temp = '\0';
foreach_hash_list_entry (colours, i, entry)
temp = stpcpy(temp, entry->key++), *temp++ = '\n';
*temp = '\0';
return 0;
fail:
saved_errno = errno;
free(colour_list_buffer_without_values);
colour_list_buffer_without_values = NULL;
return errno = saved_errno, -1;
}
/**
* Create a textual list of all colours that can be sent
* to clients upon query. This list will include value,
* and will be stored as `colour_list_buffer_with_values`.
*
* @return Zero on success, -1 on error
*/
static int create_colour_list_buffer_with_values(void)
{
size_t i, length = 1;
ssize_t part_length;
colour_list_entry_t* entry;
char* temp;
int saved_errno;
foreach_hash_list_entry (colours, i, entry)
snprintf(NULL, 0, "%i %"PRIu64" %"PRIu64" %"PRIu64" %s\n%zn",
entry->value.bytes, entry->value.red, entry->value.green,
entry->value.blue, entry->key, &part_length),
length += (size_t)part_length;
fail_if (yrealloc(temp, colour_list_buffer_with_values, length, char));
temp = colour_list_buffer_with_values;
colour_list_buffer_with_values_length = length - 1;
foreach_hash_list_entry (colours, i, entry)
sprintf(temp, "%i %"PRIu64" %"PRIu64" %"PRIu64" %s\n%zn",
entry->value.bytes, entry->value.red, entry->value.green,
entry->value.blue, entry->key, &part_length),
temp += (size_t)part_length;
return 0;
fail:
saved_errno = errno;
free(colour_list_buffer_with_values);
colour_list_buffer_with_values = NULL;
return errno = saved_errno, -1;
}
/**
* Handle the received message after it has been
* identified to contain `Command: list-colours`
*
* @param recv_client_id The value of the `Client ID`-header, "0:0" if omitted
* @param recv_message_id The value of the `Message ID`-header
* @param recv_include_values The value of the `Include values`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_list_colours(const char* recv_client_id, const char* recv_message_id,
const char* recv_include_values)
{
int include_values = 0;
char* payload;
size_t payload_length;
size_t length;
char* temp;
if (strequals(recv_client_id, "0:0"))
return eprint("got a query from an anonymous client, ignoring."), 0;
if (recv_include_values == NULL) include_values = 0;
else if (strequals(recv_include_values, "yes")) include_values = 1;
else if (strequals(recv_include_values, "no")) include_values = 0;
else
{
fail_if (send_error(recv_client_id, recv_message_id, "list-colours", 0, EPROTO, NULL));
return 0;
}
if ((colour_list_buffer_with_values == NULL) && include_values)
fail_if (create_colour_list_buffer_with_values());
else if ((colour_list_buffer_without_values == NULL) && !include_values)
fail_if (create_colour_list_buffer_without_values());
payload = include_values
? colour_list_buffer_with_values
: colour_list_buffer_without_values;
payload_length = include_values
? colour_list_buffer_with_values_length
: colour_list_buffer_without_values_length;
length = sizeof("To: \n"
"In response to: \n"
"Message ID: \n"
"Origin command: list-colours\n"
"\n") / sizeof(char);
length += strlen(recv_client_id) + strlen(recv_message_id) + 10 + payload_length;
if (length > send_buffer_size)
{
fail_if (yrealloc(temp, send_buffer, length, char));
send_buffer_size = length;
}
sprintf(send_buffer,
"To: %s\n"
"In response to: %s\n"
"Message ID: %"PRIu32"\n"
"Origin command: list-colours\n"
"\n%zn",
recv_client_id, recv_message_id, message_id,
(ssize_t*)&length);
memcpy(send_buffer + length, payload, payload_length * sizeof(char));
length += payload_length;
fail_if (full_send(send_buffer, length));
return 0;
fail:
return -1;
}
/**
* Handle the received message after it has been
* identified to contain `Command: get-colour`
*
* @param recv_client_id The value of the `Client ID`-header, "0:0" if omitted
* @param recv_message_id The value of the `Message ID`-header
* @param recv_name The value of the `Name`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_get_colour(const char* recv_client_id, const char* recv_message_id, const char* recv_name)
{
colour_t colour;
size_t length;
char* temp;
if (strequals(recv_client_id, "0:0"))
return eprint("got a query from an anonymous client, ignoring."), 0;
if (recv_name == NULL)
{
fail_if (send_error(recv_client_id, recv_message_id, "get-colour", 0, EPROTO, NULL));
return 0;
}
if (!colour_list_get(&colours, recv_name, &colour))
{
fail_if (send_error(recv_client_id, recv_message_id, "get-colour", 1, -1, "not defined"));
return 0;
}
length = sizeof("To: \n"
"In response to: \n"
"Message ID: \n"
"Origin command: get-colour\n"
"Bytes: \n"
"Red: \n"
"Green; \n"
"Blue: \n"
"\n") / sizeof(char);
length += strlen(recv_client_id) + strlen(recv_message_id) + 10 + 1 + 3 * 3 * (size_t)(colour.bytes);
if (length > send_buffer_size)
{
fail_if (yrealloc(temp, send_buffer, length, char));
send_buffer_size = length;
}
sprintf(send_buffer,
"To: %s\n"
"In response to: %s\n"
"Message ID: %"PRIu32"\n"
"Origin command: get-colour\n"
"Bytes: %i\n"
"Red: %"PRIu64"\n"
"Green; %"PRIu64"\n"
"Blue: %"PRIu64"\n"
"\n",
recv_client_id, recv_message_id, message_id, colour.bytes,
colour.red, colour.green, colour.blue);
message_id = message_id == UINT32_MAX ? 0 : (message_id + 1);
fail_if (full_send(send_buffer, (size_t)length));
return 0;
fail:
return -1;
}
/**
* Handle the received message after it has been
* identified to contain `Command: set-colour`
*
* @param recv_name The value of the `Name`-header, `NULL` if omitted
* @param recv_remove The value of the `Remove`-header, `NULL` if omitted
* @param recv_bytes The value of the `Bytes`-header, `NULL` if omitted
* @param recv_red The value of the `Red`-header, `NULL` if omitted
* @param recv_green The value of the `Green`-header, `NULL` if omitted
* @param recv_blue The value of the `Blue`-header, `NULL` if omitted
* @return Zero on success, -1 on error
*/
int handle_set_colour(const char* recv_name, const char* recv_remove, const char* recv_bytes,
const char* recv_red, const char* recv_green, const char* recv_blue)
{
uint64_t limit = UINT64_MAX;
int remove_colour = 0;
colour_t colour;
int bytes;
if (recv_remove == NULL) remove_colour = 0;
else if (strequals(recv_remove, "yes")) remove_colour = 1;
else if (strequals(recv_remove, "no")) remove_colour = 0;
else
return eprint("got an invalid value on the Remove-header, ignoring."), 0;
if (recv_name == NULL)
return eprint("did not get all required headers, ignoring."), 0;
if (remove_colour == 0)
{
if ((recv_bytes == NULL) || (recv_red == NULL) || (recv_green == NULL) || (recv_blue == NULL))
return eprint("did not get all required headers, ignoring."), 0;
if (strict_atoi(recv_bytes, &bytes, 1, 8))
return eprint("got an invalid value on the Bytes-header, ignoring."), 0;
if ((bytes != 1) && (bytes != 2) && (bytes != 4) && (bytes != 8))
return eprint("got an invalid value on the Bytes-header, ignoring."), 0;
if (bytes < 8)
limit = (((uint64_t)1) << (bytes * 8)) - 1;
colour.bytes = bytes;
if (strict_atou64(recv_red, &(colour.red), 0, limit))
return eprint("got an invalid value on the Red-header, ignoring."), 0;
if (strict_atou64(recv_green, &(colour.green), 0, limit))
return eprint("got an invalid value on the Green-header, ignoring."), 0;
if (strict_atou64(recv_blue, &(colour.blue), 0, limit))
return eprint("got an invalid value on the Blue-header, ignoring."), 0;
fail_if (set_colour(recv_name, &colour));
}
else
fail_if (set_colour(recv_name, NULL));
return 0;
fail:
return -1;
}
/**
* Check whether two colours are identical
*
* @param colour_a One of the colours
* @param colour_b The other colour
* @return 1 if the colours are equal, 0 otherwise
*/
static inline int colourequals(const colour_t* colour_a, const colour_t* colour_b)
{
size_t rc = (size_t)(colour_a->bytes - colour_b->bytes);
rc |= colour_a->red - colour_b->red;
rc |= colour_a->green - colour_b->green;
rc |= colour_a->blue - colour_b->blue;
return !rc;
}
/**
* Add, remove or modify a colour
*
* @param name The name of the colour, must not be `NULL`
* @param colour The colour, `NULL` to remove
* @return Zero on success, -1 on error, removal of
* non-existent colour does not constitute an error
*/
int set_colour(const char* name, const colour_t* colour)
{
char* name_ = NULL;
int found;
colour_t old_colour;
int saved_errno;
/* Find out whether the colour is already defined,
and retrieve its value. This is required so we
can broadcast the proper event. */
found = colour_list_get(&colours, name, &old_colour);
if (colour == NULL)
{
/* We have been asked to remove the colour. */
/* If the colour does not exist, there is no
point in removing it, and an event should
not be broadcasted. */
if (found == 0)
return 0;
/* Remove the colour. */
colour_list_remove(&colours, name);
/* Broadcast update event. */
fail_if (broadcast_update("colour-removed", name, NULL, "yes"));
}
else
{
/* We have been asked to add or modify the colour. */
/* `colour_list_put` will store the name of the colour,
so we have to make a copy that will not disappear. */
fail_if (xstrdup(name_, name));
/* Add or modify the colour. */
fail_if (colour_list_put(&colours, name_, colour));
/* Broadcast update event. */
if (found == 0)
fail_if (broadcast_update("colour-added", name, colour, "yes"));
else if (!colourequals(colour, &old_colour))
fail_if (broadcast_update("colour-changed", name, colour, "yes"));
}
return 0;
fail:
saved_errno = errno;
/* On failure, `colour_list_put` does not
free the colour name we gave it. */
free(name_);
return errno = saved_errno, -1;
}
/**
* Broadcast a colour list update event
*
* @param event The event, that is, the value for the `Command`-header, must not be `NULL`
* @param name The name of the colour, must not be `NULL`
* @param colour The new colour, `NULL` if and only if removed
* @param last_update The value on the `Last update`-header
* @return Zero on success, -1 on error
*/
int broadcast_update(const char* event, const char* name, const colour_t* colour, const char* last_update)
{
ssize_t part_length;
size_t length;
char* temp;
free(colour_list_buffer_without_values), colour_list_buffer_without_values = NULL;
free(colour_list_buffer_with_values), colour_list_buffer_with_values = NULL;
length = sizeof("Command: \nMessage ID: \nName: \nLast update: \n\n") / sizeof(char) - 1;
length += strlen(event) + 10 + strlen(name) + strlen(last_update);
if (colour != NULL)
{
length += sizeof("Bytes: \nRed: \nBlue: \nGreen: \n") / sizeof(char) - 1;
length += 1 + 3 * 3 * (size_t)(colour->bytes);
}
if (++length > send_buffer_size)
{
fail_if (yrealloc(temp, send_buffer, length, char));
send_buffer_size = length;
}
length = 0;
sprintf(send_buffer + length,
"Command: %s\n"
"Message ID: %"PRIu32"\n"
"Name: %s\n%zn",
event, message_id, name, &part_length),
length += (size_t)part_length;
if (colour != NULL)
sprintf(send_buffer + length,
"Bytes: %i\n"
"Red: %"PRIu64"\n"
"Blue: %"PRIu64"\n"
"Green: %"PRIu64"\n%zn",
colour->bytes, colour->red, colour->green,
colour->blue, &part_length),
length += (size_t)part_length;
sprintf(send_buffer + length,
"Last update: %s\n"
"\n%zn",
last_update, &part_length),
length += (size_t)part_length;
message_id = message_id == UINT32_MAX ? 0 : (message_id + 1);
fail_if (full_send(send_buffer, length));
return 0;
fail:
return -1;
}
/**
* This function is called when a signal that
* signals that the system to dump state information
* and statistics has been received
*
* @param signo The signal that has been received
*/
void received_info(int signo)
{
SIGHANDLER_START;
size_t i;
colour_list_entry_t* entry;
(void) signo;
iprintf("next message ID: %" PRIu32, message_id);
iprintf("connected: %s", connected ? "yes" : "no");
iprintf("send buffer size: %zu bytes", send_buffer_size);
iprint("DEFINED COLOURS (bytes red green blue name-hash name)");
foreach_hash_list_entry (colours, i, entry)
iprintf("%i %"PRIu64" %"PRIu64" %"PRIu64" %zu %s",
entry->value.bytes, entry->value.red, entry->value.green,
entry->value.blue, entry->key_hash, entry->key);
iprint("END DEFINED COLOURS");
SIGHANDLER_END;
}
/**
* Comparing keys
*
* @param key_a The first key, will never be `NULL`
* @param key_b The second key, will never be `NULL`
* @return Whether the keys are equal
*/
static inline int colour_list_key_comparer(const char* key_a, const char* key_b)
{
return !strcmp(key_a, key_b);
}
/**
* Determine the marshal-size of an entry's key and value
*
* @param entry The entry, will never be `NULL`, any only used entries will be passed
* @return The marshal-size of the entry's key and value
*/
static inline size_t colour_list_submarshal_size(const colour_list_entry_t* entry)
{
return sizeof(colour_t) + (strlen(entry->key) + 1) * sizeof(char);
}
/**
* Marshal an entry's key and value
*
* @param entry The entry, will never be `NULL`, any only used entries will be passed
* @param data The buffer where the entry's key and value will be stored
* @return The marshal-size of the entry's key and value
*/
static inline size_t colour_list_submarshal(const colour_list_entry_t* entry, char* restrict data)
{
size_t n = (strlen(entry->key) + 1) * sizeof(char);
memcpy(data, &(entry->value), sizeof(colour_t));
data += sizeof(colour_t) / sizeof(char);
memcpy(data, entry->key, n);
return sizeof(colour_t) + n;
}
/**
* Unmarshal an entry's key and value
*
* @param entry The entry, will never be `NULL`, any only used entries will be passed
* @param data The buffer where the entry's key and value is stored
* @return The number of read bytes, zero on error
*/
static inline size_t colour_list_subunmarshal(colour_list_entry_t* entry, char* restrict data)
{
size_t n = 0;
memcpy(&(entry->value), data, sizeof(colour_t));
data += sizeof(colour_t) / sizeof(char);
while (data[n++]);
n *= sizeof(char);
fail_if (xbmalloc(entry->key, n));
memcpy(entry->key, data, n);
return sizeof(colour_t) + n;
fail:
return 0;
}
/**
* Free the key and value of an entry in a colour list
*
* @param entry The entry
*/
void colour_list_entry_free(colour_list_entry_t* entry)
{
free(entry->key);
}
