diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mds-colour.c | 153 | ||||
| -rw-r--r-- | src/mds-colour.h | 19 |
2 files changed, 154 insertions, 18 deletions
diff --git a/src/mds-colour.c b/src/mds-colour.c index 5695dc7..82e0e76 100644 --- a/src/mds-colour.c +++ b/src/mds-colour.c @@ -525,34 +525,159 @@ int handle_set_colour(const char* recv_name, const char* recv_remove, const char if (strict_atou64(recv_blue, &(colour.blue), 0, limit)) return eprint("got an invalid value on the Blue-header, ignoring."), 0; - return set_colour(recv_name, &colour); /* TODO broadcast update */ + return set_colour(recv_name, &colour); } else - colour_list_remove(&colours, recv_name); /* TODO broadcast update */ - - return 0; + return set_colour(recv_name, NULL); } /** - * Add or modify a colour + * 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, 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_; - int r; - - if (xstrdup(name_, name)) - return -1; - r = colour_list_put(&colours, name_, colour); - if (r < 0) - free(name_); - return r; + int found; + colour_t old_colour; + + /* 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 */ + return 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. */ + if (xstrdup(name_, name)) + return -1; + + /* Add or modify the colour */ + if (colour_list_put(&colours, name_, colour) < 0) + { + /* On failure, `colour_list_put` does not + free the colour name we gave it */ + free(name_); + return -1; + } + + /* Broadcast update event */ + if (found == 0) + return broadcast_update("colour-added", name, colour, "yes"); + else if (!colourequals(colour, &old_colour)) + return broadcast_update("colour-changed", name, colour, "yes"); + + return 0; + } +} + + +/** + * 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 = 0; + char* temp; + + snprintf(NULL, 0, + "Command: %s\n" + "Name: %s\n" + "Last update: %s\n" + "\n%zn", + event, name, last_update, &part_length), + length += (size_t)part_length; + + if (colour != NULL) + snprintf(NULL, 0, + "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; + + if (length > send_buffer_size) + { + if (yrealloc(temp, send_buffer, length, char)) + return -1; + send_buffer_size = length; + } + + length = 0; + + sprintf(send_buffer + length, + "Command: %s\n" + "Name: %s\n%zn", + event, 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; + + return full_send(send_buffer, length); } diff --git a/src/mds-colour.h b/src/mds-colour.h index 6ff0402..341ffc8 100644 --- a/src/mds-colour.h +++ b/src/mds-colour.h @@ -102,16 +102,27 @@ int handle_get_colour(const char* recv_client_id, const char* recv_message_id, c 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); - /** - * Add or modify a colour + * Add, remove or modify a colour * * @param name The name of the colour, must not be `NULL` - * @param colour 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) __attribute__((nonnull)); +int set_colour(const char* name, const colour_t* colour) __attribute__((nonnull(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) __attribute__((nonnull(1, 2, 4))); CREATE_HASH_LIST_SUBCLASS(colour_list, char* restrict, const char* restrict, colour_t) |