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Truncate UTF-8 properly

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This will avoid to produce invalid UTF-8 results (although unlikely).
This commit is contained in:
Romain Vimont 2019-05-30 19:13:19 +02:00
parent 0a7fe7ad57
commit 6ec2ddd2d1
1 changed files with 5 additions and 5 deletions
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8
app/src/control_event.c
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@ -4,6 +4,7 @@
#include "buffer_util.h"
#include "log.h"
#include "str_util.h"
static void
write_position(uint8_t *buf, const struct position *position) {
@ -24,11 +25,10 @@ control_event_serialize(const struct control_event *event, unsigned char *buf) {
return 10;
case CONTROL_EVENT_TYPE_TEXT: {
// write length (2 bytes) + string (non nul-terminated)
size_t len = strlen(event->text_event.text);
if (len > CONTROL_EVENT_TEXT_MAX_LENGTH) {
// injecting a text takes time, so limit the text length
len = CONTROL_EVENT_TEXT_MAX_LENGTH;
}
size_t len = utf8_truncation_index(event->text_event.text,
CONTROL_EVENT_TEXT_MAX_LENGTH);
buffer_write16be(&buf[1], (uint16_t) len);
memcpy(&buf[3], event->text_event.text, len);
return 3 + len;