scx/c/xlib/extension.c

#include "xlib.h"

static s48_value P_List_Extensions (d) s48_value d; {
    s48_value ret;
    int n;
    register i;
    register char **p;
    S48_DECLARE_GC_PROTECT(1);

    Check_Type (d, T_Display);
    Disable_Interrupts;
    p = XListExtensions (DISPLAY(d)->dpy, &n);
    Enable_Interrupts;
    ret = s48_make_vector (n, S48_NULL);
    S48_GC_PROTECT_1 (ret);
    for (i = 0; i < n; i++) {
	s48_value e;
	
	e = Make_String (p[i], strlen (p[i]));
	S48_VECTOR_SET(ret, i, e;)
    }
    S48_GC_UNPROTECT;
    XFreeExtensionList (p);
    return ret;
}

static s48_value P_Query_Extension (d, name) s48_value d, name; {
    int opcode, event, error;
    s48_value ret, t;
    S48_DECLARE_GC_PROTECT(2);

    Check_Type (d, T_Display);
    if (!XQueryExtension (DISPLAY(d)->dpy, Get_Strsym (name), &opcode,
	    &event, &error))
	return S48_FALSE;
    t = ret = P_Make_List (s48_enter_integer (3), S48_NULL);
    S48_GC_PROTECT_2 (ret, t);
    S48_CAR (t) = (opcode ? s48_enter_integer (opcode) : S48_FALSE); t = S48_CDR (t);
    S48_CAR (t) = (event ? s48_enter_integer (event) : S48_FALSE); t = S48_CDR (t);
    S48_CAR (t) = (error ? s48_enter_integer (error) : S48_FALSE);
    S48_GC_UNPROTECT;
    return ret;
}

elk_init_xlib_extension () {
    Define_Primitive (P_List_Extensions,    "list-extensions",   1, 1, EVAL);
    Define_Primitive (P_Query_Extension,    "query-extension",   2, 2, EVAL);
}