Print log line with GBDK (needs <gbdk/console.h> and <string.h>).

print_log.c

void print_log(const char *__s) {
    size_t max_length = 19;
    char __trimmed[20]; // 19 characters + 1 for null terminator.
    size_t len = strlen(__s);
    size_t i;

    // Copy characters up to max_length or until the end of the string.
    for (i = 0; i < max_length && i < len; ++i) {
        __trimmed[i] = __s[i];
    }

    // Fill the remaining space with empty spaces.
    for (; i < max_length; ++i) {
        __trimmed[i] = ' ';
    }

    // Null-terminate the string.
    __trimmed[max_length] = '\0';

    // Reset cursor position.
    gotoxy(1, 16);
    printf("%s", __trimmed);
}