mouth_process.c

#include <stdio.h>
#include <string.h>

void show_icon(const char *code)
{
    static char msgHold[31] = {0};
    char icon[91];

    //Arduinos have a hardcoded limit of 64 bytes for their serial input
    //buffer. To get around this Mycroft sends large messages as two parts.

    //check if first or second half of a message
    //if it is, concatenate the message into one
    if (code[strlen(code)-1] == '$')
    {
        if(msgHold[0] != 0) //if holding part of a messasge
        {
            strcpy(icon,msgHold);
            strcat(icon,code);
            icon[strlen(icon)-1] = 0;
            msgHold[0] = 0;
        }
        else //hold part of a message
        {
            strcpy(msgHold, code);
            return;
        }
    }
    else
    {
            strcpy(icon, code);
    }
    printf("icon: %s\n", icon);
}

int main(void)
{
    show_icon("AAAAAAAAAAA$");
    show_icon("BBBBBBBBBBB$");
    return 0;
}

output

ake@Woodstock:~/projects/c/test$ gcc mouth_process.c 
ake@Woodstock:~/projects/c/test$ ./a.out 
icon: AAAAAAAAAAA$BBBBBBBBBBB
ake@Woodstock:~/projects/c/test$