Part of libtcod's console_c.c

int TCOD_console_print_internal(TCOD_console_t con,int x,int y, int rw, int rh, TCOD_bkgnd_flag_t flag,
    TCOD_alignment_t align, char *msg, bool can_split, bool count_only) {
    unsigned char *c=(unsigned char *)msg;
    int cx=0,cy=y;
    int minx,maxx,miny,maxy;
    TCOD_color_t oldFore;
    TCOD_color_t oldBack;
    TCOD_console_data_t *dat=con ? (TCOD_console_data_t *)con : TCOD_ctx.root;
    TCOD_IFNOT ( dat != NULL
        && (unsigned)(x) < (unsigned)dat->w && (unsigned)(y) < (unsigned)dat->h )
        return 0;
    TCOD_IFNOT(msg != NULL) return 0;