Programming

char *conversionpointer = NULL;

char *chartodecimal(const char *STRING) // replaces all occurrences of char to html decimals
{
    conversionpointer = (char *)realloc(conversionpointer, strlen(STRING) + 1);

    strcpy(conversionpointer, STRING);

    char original[15][3] = {        "ç",   "\"",    "&",     "ñ",     "ä",     "é",     "ë",     "ü",     "ã",     "º",     "ª",     "á",     "ó",     "ø",     "ß"};
    char replacement[15][7] = {"&#231 ;","&#34 ;","&#38 ;","&#241 ;","&#228 ;","&#233 ;","&#235 ;","&#252 ;","&#227 ;","&#186 ;","&#170 ;","&#225 ;","&#243 ;","&#248 ;","&#223 ;"};

    char *conversionpointeroriginalp = NULL;
    char *buffer = NULL;
    int count = 0;

    while(count < 15)
    {
        conversionpointeroriginalp = strstr(conversionpointer, original[count]);

        while(conversionpointeroriginalp != NULL)
        {
            buffer = (char *)realloc(buffer, strlen(conversionpointer) + 1 + (strlen(replacement[count]) - strlen(original[count])));
            strncpy(buffer, conversionpointer, (size_t)(conversionpointeroriginalp - conversionpointer));

            sprintf(buffer + (conversionpointeroriginalp - conversionpointer), "%s%s", replacement[count], conversionpointeroriginalp + strlen(original[count]));

            conversionpointer = (char *)realloc(conversionpointer, strlen(buffer) + 1);

            strcpy(conversionpointer, buffer);

            conversionpointeroriginalp = strstr(conversionpointeroriginalp, original[count]);
        }

        count++;
    }

    if (buffer != NULL)
    {
        free(buffer);
    }

    return conversionpointer;
}

int main(void)
{
    printf("%s\n", chartodecimal("Barça"));

    return 0;
}

    char original[15][7] = {   "\u00E7"/*ç*/,   "\""     ,    "&"     ,"\u00F1"/*ñ*/,"\u00E4"/*ä*/,"\u00E9"/*é*/,"\u00EB"/*ë*/,"\u00FC"/*ü*/,"\u00E3"/*ã*/,"\u00BA"/*º*/,"\u00AA"/*ª*/,"\u00E1"/*á*/,"\u00F3"/*ó*/,"\u00F8"/*ø*/,"\u00DF"/*ß*/}; // Unicode is used instead of the char for portability
    char replacement[15][7] = {""&#231 ;"/*ç*/,"&#34 ;"/*"*/,"&#38 ;"/*&*/,"&#241 ;"/*ñ*/,"&#228 ;"/*ä*/,"&#233 ;"/*é*/,"&#235 ;"/*ë*/,"&#252 ;"/*ü*/,"&#227 ;"/*ã*/,"&#186 ;"/*º*/,"&#170 ;"/*ª*/,"&#225 ;"/*á*/,"&#243 ;"/*ó*/,"&#248 ;"/*ø*/,"&#223 ;"/*ß*/};