diff --git a/caca/caca.h b/caca/caca.h
index d3a4b31..b147fd1 100644
--- a/caca/caca.h
+++ b/caca/caca.h
@@ -81,7 +81,7 @@ struct caca_event
     {
         struct { unsigned int x, y, button; } mouse;
         struct { unsigned int w, h; } resize;
-        struct { unsigned int ch; unsigned long int utf32; char utf8[8]; } key;
+        struct { unsigned int ch; uint32_t utf32; char utf8[8]; } key;
     } data;
     uint8_t padding[16];
 };
@@ -192,7 +192,7 @@ __extern unsigned int caca_get_mouse_x(caca_display_t const *);
 __extern unsigned int caca_get_mouse_y(caca_display_t const *);
 __extern enum caca_event_type caca_get_event_type(caca_event_t const *);
 __extern unsigned int caca_get_event_key_ch(caca_event_t const *);
-__extern unsigned long int caca_get_event_key_utf32(caca_event_t const *);
+__extern uint32_t caca_get_event_key_utf32(caca_event_t const *);
 __extern int caca_get_event_key_utf8(caca_event_t const *, char *);
 __extern unsigned int caca_get_event_mouse_button(caca_event_t const *);
 __extern unsigned int caca_get_event_mouse_x(caca_event_t const *);
diff --git a/caca/driver_gl.c b/caca/driver_gl.c
index 5063226..050a274 100644
--- a/caca/driver_gl.c
+++ b/caca/driver_gl.c
@@ -68,7 +68,7 @@ struct driver_private
     cucul_font_t *f;
     float font_width, font_height;
     float incx, incy;
-    unsigned long int const *blocks;
+    uint32_t const *blocks;
     int *txid;
     uint8_t close;
     uint8_t bit;
diff --git a/caca/event.c b/caca/event.c
index b26d7dc..f212c23 100644
--- a/caca/event.c
+++ b/caca/event.c
@@ -215,7 +215,7 @@ unsigned int caca_get_event_key_ch(caca_event_t const *ev)
  *  \param ev The libcaca event.
  *  \return The key's Unicode value.
  */
-unsigned long int caca_get_event_key_utf32(caca_event_t const *ev)
+uint32_t caca_get_event_key_utf32(caca_event_t const *ev)
 {
     return ((caca_privevent_t const *)ev)->data.key.utf32;
 }
diff --git a/cucul/attr.c b/cucul/attr.c
index fd40f0c..ce708bc 100644
--- a/cucul/attr.c
+++ b/cucul/attr.c
@@ -65,12 +65,12 @@ static const uint16_t ansitab14[16] =
  *  \param y Y coordinate.
  *  \return The requested attribute.
  */
-unsigned long int cucul_get_attr(cucul_canvas_t const *cv, int x, int y)
+uint32_t cucul_get_attr(cucul_canvas_t const *cv, int x, int y)
 {
     if(x < 0 || x >= (int)cv->width || y < 0 || y >= (int)cv->height)
-        return (unsigned long int)cv->curattr;
+        return cv->curattr;
 
-    return (unsigned long int)cv->attrs[x + y * cv->width];
+    return cv->attrs[x + y * cv->width];
 }
 
 /** \brief Set the default character attribute.
@@ -90,21 +90,14 @@ unsigned long int cucul_get_attr(cucul_canvas_t const *cv, int x, int y)
  *
  *  To retrieve the current attribute value, use cucul_get_attr(-1,-1).
  *
- *  If an error occurs, -1 is returned and \b errno is set accordingly:
- *  - \c EINVAL The attribute value is out of the 32-bit range.
+ *  This function never fails.
  *
  *  \param cv A handle to the libcucul canvas.
  *  \param attr The requested attribute value.
- *  \return 0 in case of success, -1 if an error occurred.
+ *  \return This function always returns 0.
  */
-int cucul_set_attr(cucul_canvas_t *cv, unsigned long int attr)
+int cucul_set_attr(cucul_canvas_t *cv, uint32_t attr)
 {
-    if(sizeof(unsigned long int) > sizeof(uint32_t) && attr > 0xffffffff)
-    {
-        seterrno(EINVAL);
-        return -1;
-    }
-
     if(attr < 0x00000010)
         attr = (cv->curattr & 0xfffffff0) | attr;
 
@@ -126,25 +119,18 @@ int cucul_set_attr(cucul_canvas_t *cv, unsigned long int attr)
  *    \e CUCUL_BLINK, \e CUCUL_BOLD and \e CUCUL_ITALICS), in which case
  *    setting the attribute does not modify the current colour information.
  *
- *  If an error occurs, -1 is returned and \b errno is set accordingly:
- *  - \c EINVAL The attribute value is out of the 32-bit range.
+ *  This function never fails.
  *
  *  \param cv A handle to the libcucul canvas.
  *  \param x X coordinate.
  *  \param y Y coordinate.
  *  \param attr The requested attribute value.
- *  \return 0 in case of success, -1 if an error occurred.
+ *  \return This function always returns 0.
  */
-int cucul_put_attr(cucul_canvas_t *cv, int x, int y, unsigned long int attr)
+int cucul_put_attr(cucul_canvas_t *cv, int x, int y, uint32_t attr)
 {
     uint32_t *curattr, *curchar;
 
-    if(sizeof(unsigned long int) > sizeof(uint32_t) && attr > 0xffffffff)
-    {
-        seterrno(EINVAL);
-        return -1;
-    }
-
     if(x < 0 || x >= (int)cv->width || y < 0 || y >= (int)cv->height)
         return 0;
 
@@ -207,24 +193,17 @@ int cucul_set_color_ansi(cucul_canvas_t *cv, uint8_t fg, uint8_t bg)
  *  instance, 0xf088 is solid dark cyan (A=15 R=0 G=8 B=8), and 0x8fff is
  *  white with 50% alpha (A=8 R=15 G=15 B=15).
  *
- *  If an error occurs, 0 is returned and \b errno is set accordingly:
- *  - \c EINVAL At least one of the colour values is invalid.
+ *  This function never fails.
  *
  *  \param cv A handle to the libcucul canvas.
  *  \param fg The requested ARGB foreground colour.
  *  \param bg The requested ARGB background colour.
- *  \return 0 in case of success, -1 if an error occurred.
+ *  \return This function always returns 0.
  */
-int cucul_set_color_argb(cucul_canvas_t *cv, unsigned int fg, unsigned int bg)
+int cucul_set_color_argb(cucul_canvas_t *cv, uint16_t fg, uint16_t bg)
 {
     uint32_t attr;
 
-    if(fg > 0xffff || bg > 0xffff)
-    {
-        seterrno(EINVAL);
-        return -1;
-    }
-
     if(fg < 0x100)
         fg += 0x100;
 
@@ -257,7 +236,7 @@ int cucul_set_color_argb(cucul_canvas_t *cv, unsigned int fg, unsigned int bg)
  *  \param attr The requested attribute value.
  *  \return The corresponding DOS ANSI value.
  */
-uint8_t cucul_attr_to_ansi(unsigned long int attr)
+uint8_t cucul_attr_to_ansi(uint32_t attr)
 {
     uint8_t fg = nearest_ansi((attr >> 4) & 0x3fff);
     uint8_t bg = nearest_ansi(attr >> 18);
@@ -281,7 +260,7 @@ uint8_t cucul_attr_to_ansi(unsigned long int attr)
  *  \param attr The requested attribute value.
  *  \return The corresponding ANSI foreground value.
  */
-uint8_t cucul_attr_to_ansi_fg(unsigned long int attr)
+uint8_t cucul_attr_to_ansi_fg(uint32_t attr)
 {
     return nearest_ansi(((uint16_t)attr >> 4) & 0x3fff);
 }
@@ -301,7 +280,7 @@ uint8_t cucul_attr_to_ansi_fg(unsigned long int attr)
  *  \param attr The requested attribute value.
  *  \return The corresponding ANSI background value.
  */
-uint8_t cucul_attr_to_ansi_bg(unsigned long int attr)
+uint8_t cucul_attr_to_ansi_bg(uint32_t attr)
 {
     return nearest_ansi(attr >> 18);
 }
@@ -321,7 +300,7 @@ uint8_t cucul_attr_to_ansi_bg(unsigned long int attr)
  *  \param attr The requested attribute value.
  *  \return The corresponding 12-bit RGB foreground value.
  */
-unsigned int cucul_attr_to_rgb12_fg(unsigned long int attr)
+uint16_t cucul_attr_to_rgb12_fg(uint32_t attr)
 {
     uint16_t fg = (attr >> 4) & 0x3fff;
 
@@ -352,7 +331,7 @@ unsigned int cucul_attr_to_rgb12_fg(unsigned long int attr)
  *  \param attr The requested attribute value.
  *  \return The corresponding 12-bit RGB background value.
  */
-unsigned int cucul_attr_to_rgb12_bg(unsigned long int attr)
+uint16_t cucul_attr_to_rgb12_bg(uint32_t attr)
 {
     uint16_t bg = attr >> 18;
 
@@ -387,7 +366,7 @@ unsigned int cucul_attr_to_rgb12_bg(unsigned long int attr)
  *  \param attr The requested attribute value.
  *  \param argb An array of 8-bit integers.
  */
-void cucul_attr_to_argb64(unsigned long int attr, uint8_t argb[8])
+void cucul_attr_to_argb64(uint32_t attr, uint8_t argb[8])
 {
     uint16_t fg = (attr >> 4) & 0x3fff;
     uint16_t bg = attr >> 18;
diff --git a/cucul/box.c b/cucul/box.c
index 9e6126b..d142892 100644
--- a/cucul/box.c
+++ b/cucul/box.c
@@ -38,7 +38,7 @@
  *  \return This function always returns 0.
  */
 int cucul_draw_box(cucul_canvas_t *cv, int x1, int y1, int w, int h, 
-                   unsigned long int ch)
+                   uint32_t ch)
 {
     int x2 = x1 + w - 1;
     int y2 = y1 + h - 1;
@@ -188,7 +188,7 @@ int cucul_draw_cp437_box(cucul_canvas_t *cv, int x1, int y1, int w, int h)
  *  \return This function always returns 0.
  */
 int cucul_fill_box(cucul_canvas_t *cv, int x1, int y1, int w, int h,
-                   unsigned long int ch)
+                   uint32_t ch)
 {
     int x, y, xmax, ymax;
 
diff --git a/cucul/canvas.c b/cucul/canvas.c
index 6b3fe6e..0990bf8 100644
--- a/cucul/canvas.c
+++ b/cucul/canvas.c
@@ -109,7 +109,7 @@ int cucul_get_cursor_y(cucul_canvas_t const *cv)
  *  \param ch The character to print.
  *  \return This function always returns 0.
  */
-int cucul_put_char(cucul_canvas_t *cv, int x, int y, unsigned long int ch)
+int cucul_put_char(cucul_canvas_t *cv, int x, int y, uint32_t ch)
 {
     uint32_t *curchar, *curattr, attr;
     int fullwidth;
@@ -191,12 +191,12 @@ int cucul_put_char(cucul_canvas_t *cv, int x, int y, unsigned long int ch)
  *  \param y Y coordinate.
  *  \return This function always returns 0.
  */
-unsigned long int cucul_get_char(cucul_canvas_t const *cv, int x, int y)
+uint32_t cucul_get_char(cucul_canvas_t const *cv, int x, int y)
 {
     if(x < 0 || x >= (int)cv->width || y < 0 || y >= (int)cv->height)
         return ' ';
 
-    return (unsigned long int)cv->chars[x + y * cv->width];
+    return cv->chars[x + y * cv->width];
 }
 
 /** \brief Print a string.
diff --git a/cucul/charset.c b/cucul/charset.c
index 55a32d7..f85cd5f 100644
--- a/cucul/charset.c
+++ b/cucul/charset.c
@@ -111,7 +111,7 @@ static uint32_t const cp437_lookup2[] =
  *  \return The corresponding UTF-32 character, or zero if the character
  *  is incomplete.
  */
-unsigned long int cucul_utf8_to_utf32(char const *s, unsigned int *read)
+uint32_t cucul_utf8_to_utf32(char const *s, unsigned int *read)
 {
     unsigned int bytes = trailing[(int)(unsigned char)*s];
     unsigned int i = 0;
@@ -150,7 +150,7 @@ unsigned long int cucul_utf8_to_utf32(char const *s, unsigned int *read)
  *  \param ch The UTF-32 character.
  *  \return The number of bytes written.
  */
-unsigned int cucul_utf32_to_utf8(char *buf, unsigned long int ch)
+unsigned int cucul_utf32_to_utf8(char *buf, uint32_t ch)
 {
     static const uint8_t mark[7] =
     {
@@ -190,7 +190,7 @@ unsigned int cucul_utf32_to_utf8(char *buf, unsigned long int ch)
  *  \param ch The UTF-32 character.
  *  \return The corresponding CP437 character, or "?" if not representable.
  */
-uint8_t cucul_utf32_to_cp437(unsigned long int ch)
+uint8_t cucul_utf32_to_cp437(uint32_t ch)
 {
     unsigned int i;
 
@@ -222,7 +222,7 @@ uint8_t cucul_utf32_to_cp437(unsigned long int ch)
  *  \param ch The CP437 character.
  *  \return The corresponding UTF-32 character, or zero if not representable.
  */
-unsigned long int cucul_cp437_to_utf32(uint8_t ch)
+uint32_t cucul_cp437_to_utf32(uint8_t ch)
 {
     if(ch > 0x7f)
         return cp437_lookup2[ch - 0x7f];
@@ -248,7 +248,7 @@ unsigned long int cucul_cp437_to_utf32(uint8_t ch)
  *  \return The corresponding ASCII character, or a graphically close
  *  equivalent if found, or "?" if not representable.
  */
-char cucul_utf32_to_ascii(unsigned long int ch)
+char cucul_utf32_to_ascii(uint32_t ch)
 {
     /* Standard ASCII */
     if(ch < 0x80)
@@ -387,7 +387,7 @@ char cucul_utf32_to_ascii(unsigned long int ch)
  *  \param ch The UTF-32 character.
  *  \return 1 if the character is fullwidth, 0 otherwise.
  */
-int cucul_utf32_is_fullwidth(unsigned long int ch)
+int cucul_utf32_is_fullwidth(uint32_t ch)
 {
     if(ch < 0x2e80) /* Standard stuff */
         return 0;
diff --git a/cucul/conic.c b/cucul/conic.c
index f015e03..385453b 100644
--- a/cucul/conic.c
+++ b/cucul/conic.c
@@ -39,8 +39,7 @@ static void ellipsepoints(cucul_canvas_t *, int, int, int, int, uint32_t, int);
  *  \param ch UTF-32 character to be used to draw the circle outline.
  *  \return This function always returns 0.
  */
-int cucul_draw_circle(cucul_canvas_t *cv, int x, int y, int r,
-                      unsigned long int ch)
+int cucul_draw_circle(cucul_canvas_t *cv, int x, int y, int r, uint32_t ch)
 {
     int test, dx, dy;
 
@@ -69,7 +68,7 @@ int cucul_draw_circle(cucul_canvas_t *cv, int x, int y, int r,
  *  \return This function always returns 0.
  */
 int cucul_fill_ellipse(cucul_canvas_t *cv, int xo, int yo, int a, int b,
-                       unsigned long int ch)
+                       uint32_t ch)
 {
     int d2;
     int x = 0;
@@ -129,7 +128,7 @@ int cucul_fill_ellipse(cucul_canvas_t *cv, int xo, int yo, int a, int b,
  *  \return This function always returns 0.
  */
 int cucul_draw_ellipse(cucul_canvas_t *cv, int xo, int yo, int a, int b,
-                       unsigned long int ch)
+                       uint32_t ch)
 {
     int d2;
     int x = 0;
diff --git a/cucul/cucul.h b/cucul/cucul.h
index d54a458..b337e11 100644
--- a/cucul/cucul.h
+++ b/cucul/cucul.h
@@ -110,15 +110,14 @@ __extern char const * cucul_get_version(void);
 __extern int cucul_gotoxy(cucul_canvas_t *, int, int);
 __extern int cucul_get_cursor_x(cucul_canvas_t const *);
 __extern int cucul_get_cursor_y(cucul_canvas_t const *);
-__extern int cucul_put_char(cucul_canvas_t *, int, int, unsigned long int);
-__extern unsigned long int cucul_get_char(cucul_canvas_t const *, int, int);
+__extern int cucul_put_char(cucul_canvas_t *, int, int, uint32_t);
+__extern uint32_t cucul_get_char(cucul_canvas_t const *, int, int);
 __extern int cucul_put_str(cucul_canvas_t *, int, int, char const *);
-__extern unsigned long int cucul_get_attr(cucul_canvas_t const *, int, int);
-__extern int cucul_set_attr(cucul_canvas_t *, unsigned long int);
-__extern int cucul_put_attr(cucul_canvas_t *, int, int, unsigned long int);
+__extern uint32_t cucul_get_attr(cucul_canvas_t const *, int, int);
+__extern int cucul_set_attr(cucul_canvas_t *, uint32_t);
+__extern int cucul_put_attr(cucul_canvas_t *, int, int, uint32_t);
 __extern int cucul_set_color_ansi(cucul_canvas_t *, uint8_t, uint8_t);
-__extern int cucul_set_color_argb(cucul_canvas_t *, unsigned int,
-                                  unsigned int);
+__extern int cucul_set_color_argb(cucul_canvas_t *, uint16_t, uint16_t);
 __extern int cucul_printf(cucul_canvas_t *, int, int, char const *, ...);
 __extern int cucul_clear_canvas(cucul_canvas_t *);
 __extern int cucul_set_canvas_handle(cucul_canvas_t *, int, int);
@@ -150,12 +149,12 @@ __extern int cucul_stretch_right(cucul_canvas_t *);
  *  These functions perform conversions between attribute values.
  *
  *  @{ */
-__extern uint8_t cucul_attr_to_ansi(unsigned long int);
-__extern uint8_t cucul_attr_to_ansi_fg(unsigned long int);
-__extern uint8_t cucul_attr_to_ansi_bg(unsigned long int);
-__extern unsigned int cucul_attr_to_rgb12_fg(unsigned long int);
-__extern unsigned int cucul_attr_to_rgb12_bg(unsigned long int);
-__extern void cucul_attr_to_argb64(unsigned long int, uint8_t[8]);
+__extern uint8_t cucul_attr_to_ansi(uint32_t);
+__extern uint8_t cucul_attr_to_ansi_fg(uint32_t);
+__extern uint8_t cucul_attr_to_ansi_bg(uint32_t);
+__extern uint16_t cucul_attr_to_rgb12_fg(uint32_t);
+__extern uint16_t cucul_attr_to_rgb12_bg(uint32_t);
+__extern void cucul_attr_to_argb64(uint32_t, uint8_t[8]);
 /*  @} */
 
 /** \defgroup cucul_charset libcucul character set conversions
@@ -163,12 +162,12 @@ __extern void cucul_attr_to_argb64(unsigned long int, uint8_t[8]);
  *  These functions perform conversions between usual character sets.
  *
  *  @{ */
-__extern unsigned long int cucul_utf8_to_utf32(char const *, unsigned int *);
-__extern unsigned int cucul_utf32_to_utf8(char *, unsigned long int);
-__extern uint8_t cucul_utf32_to_cp437(unsigned long int);
-__extern unsigned long int cucul_cp437_to_utf32(uint8_t);
-__extern char cucul_utf32_to_ascii(unsigned long int);
-__extern int cucul_utf32_is_fullwidth(unsigned long int);
+__extern uint32_t cucul_utf8_to_utf32(char const *, unsigned int *);
+__extern unsigned int cucul_utf32_to_utf8(char *, uint32_t);
+__extern uint8_t cucul_utf32_to_cp437(uint32_t);
+__extern uint32_t cucul_cp437_to_utf32(uint8_t);
+__extern char cucul_utf32_to_ascii(uint32_t);
+__extern int cucul_utf32_is_fullwidth(uint32_t);
 /*  @} */
 
 /** \defgroup cucul_primitives libcucul primitives drawing
@@ -177,35 +176,29 @@ __extern int cucul_utf32_is_fullwidth(unsigned long int);
  *  boxes, triangles and ellipses.
  *
  *  @{ */
-__extern int cucul_draw_line(cucul_canvas_t *, int, int, int, int,
-                             unsigned long int);
+__extern int cucul_draw_line(cucul_canvas_t *, int, int, int, int, uint32_t);
 __extern int cucul_draw_polyline(cucul_canvas_t *, int const x[],
-                                 int const y[], int, unsigned long int);
+                                 int const y[], int, uint32_t);
 __extern int cucul_draw_thin_line(cucul_canvas_t *, int, int, int, int);
 __extern int cucul_draw_thin_polyline(cucul_canvas_t *, int const x[],
                                       int const y[], int);
 
-__extern int cucul_draw_circle(cucul_canvas_t *, int, int, int,
-                               unsigned long int);
-__extern int cucul_draw_ellipse(cucul_canvas_t *, int, int, int, int,
-                                unsigned long int);
+__extern int cucul_draw_circle(cucul_canvas_t *, int, int, int, uint32_t);
+__extern int cucul_draw_ellipse(cucul_canvas_t *, int, int, int, int, uint32_t);
 __extern int cucul_draw_thin_ellipse(cucul_canvas_t *, int, int, int, int);
-__extern int cucul_fill_ellipse(cucul_canvas_t *, int, int, int, int,
-                                unsigned long int);
+__extern int cucul_fill_ellipse(cucul_canvas_t *, int, int, int, int, uint32_t);
 
-__extern int cucul_draw_box(cucul_canvas_t *, int, int, int, int,
-                            unsigned long int);
+__extern int cucul_draw_box(cucul_canvas_t *, int, int, int, int, uint32_t);
 __extern int cucul_draw_thin_box(cucul_canvas_t *, int, int, int, int);
 __extern int cucul_draw_cp437_box(cucul_canvas_t *, int, int, int, int);
-__extern int cucul_fill_box(cucul_canvas_t *, int, int, int, int,
-                            unsigned long int);
+__extern int cucul_fill_box(cucul_canvas_t *, int, int, int, int, uint32_t);
 
 __extern int cucul_draw_triangle(cucul_canvas_t *, int, int, int, int, int,
-                                 int, unsigned long int);
+                                 int, uint32_t);
 __extern int cucul_draw_thin_triangle(cucul_canvas_t *, int, int, int, int,
                                       int, int);
 __extern int cucul_fill_triangle(cucul_canvas_t *, int, int, int, int, int,
-                                 int, unsigned long int);
+                                 int, uint32_t);
 /*  @} */
 
 /** \defgroup cucul_frame libcucul canvas frame handling
@@ -230,10 +223,8 @@ __extern int cucul_free_frame(cucul_canvas_t *, unsigned int);
  *  @{ */
 __extern cucul_dither_t *cucul_create_dither(unsigned int, unsigned int,
                                              unsigned int, unsigned int,
-                                             unsigned long int,
-                                             unsigned long int,
-                                             unsigned long int,
-                                             unsigned long int);
+                                             uint32_t, uint32_t,
+                                             uint32_t, uint32_t);
 __extern int cucul_set_dither_palette(cucul_dither_t *,
                                       unsigned int r[], unsigned int g[],
                                       unsigned int b[], unsigned int a[]);
@@ -274,7 +265,7 @@ __extern cucul_font_t *cucul_load_font(void const *, unsigned int);
 __extern char const * const * cucul_get_font_list(void);
 __extern unsigned int cucul_get_font_width(cucul_font_t const *);
 __extern unsigned int cucul_get_font_height(cucul_font_t const *);
-__extern unsigned long int const *cucul_get_font_blocks(cucul_font_t const *);
+__extern unsigned int const *cucul_get_font_blocks(cucul_font_t const *);
 __extern int cucul_render_canvas(cucul_canvas_t const *, cucul_font_t const *,
                                  void *, unsigned int, unsigned int,
                                  unsigned int);
@@ -287,7 +278,7 @@ __extern int cucul_free_font(cucul_font_t *);
  *
  *  @{ */
 __extern int cucul_canvas_set_figfont(cucul_canvas_t *, char const *);
-__extern int cucul_put_figchar(cucul_canvas_t *, unsigned long int);
+__extern int cucul_put_figchar(cucul_canvas_t *, uint32_t);
 /*  @} */
 
 /** \defgroup cucul_importexport libcucul importers/exporters from/to various
diff --git a/cucul/dither.c b/cucul/dither.c
index 95f8491..17bef93 100644
--- a/cucul/dither.c
+++ b/cucul/dither.c
@@ -169,7 +169,7 @@ struct cucul_dither
 /*
  * Local prototypes
  */
-static void mask2shift(unsigned long int, int *, int *);
+static void mask2shift(uint32_t, int *, int *);
 static float gammapow(float x, float y);
 
 static void get_rgba_default(cucul_dither_t const *, uint8_t *, int, int,
@@ -262,10 +262,8 @@ static inline void rgb2hsv_default(int r, int g, int b,
  */
 cucul_dither_t *cucul_create_dither(unsigned int bpp, unsigned int w,
                                     unsigned int h, unsigned int pitch,
-                                    unsigned long int rmask,
-                                    unsigned long int gmask,
-                                    unsigned long int bmask,
-                                    unsigned long int amask)
+                                    uint32_t rmask, uint32_t gmask,
+                                    uint32_t bmask, uint32_t amask)
 {
     cucul_dither_t *d;
     int i;
@@ -1213,7 +1211,7 @@ int cucul_free_dither(cucul_dither_t *d)
  */
 
 /* Convert a mask, eg. 0x0000ff00, to shift values, eg. 8 and -4. */
-static void mask2shift(unsigned long int mask, int *right, int *left)
+static void mask2shift(uint32_t mask, int *right, int *left)
 {
     int rshift = 0, lshift = 0;
 
diff --git a/cucul/figfont.c b/cucul/figfont.c
index 92fe371..c8329a7 100644
--- a/cucul/figfont.c
+++ b/cucul/figfont.c
@@ -38,7 +38,7 @@ struct cucul_figfont
 
     enum { H_DEFAULT, H_KERN, H_SMUSH, H_NONE, H_OVERLAP } hmode;
     unsigned int hsmushrule;
-    unsigned long int hardblank;
+    uint32_t hardblank;
     unsigned int height, baseline, max_length;
     int old_layout;
     unsigned int print_direction, full_layout, codetag_count;
@@ -127,7 +127,7 @@ int cucul_canvas_set_figfont(cucul_canvas_t *cv, char const *path)
     return 0;
 }
 
-int cucul_put_figchar(cucul_canvas_t *cv, unsigned long int ch)
+int cucul_put_figchar(cucul_canvas_t *cv, uint32_t ch)
 {
     cucul_figfont_t *ff = cv->ff;
     unsigned int c, w, h, x, y, overlap, extra, xleft, xright;
@@ -450,7 +450,7 @@ cucul_figfont_t * open_figfont(char const *path)
      * smushing, nor any kind of error checking. */
     for(j = 0; j < ff->height * ff->glyphs; j++)
     {
-        unsigned long int ch, oldch = 0;
+        uint32_t ch, oldch = 0;
 
         for(i = ff->max_length; i--;)
         {
diff --git a/cucul/font.c b/cucul/font.c
index 7ea2719..bca9a71 100644
--- a/cucul/font.c
+++ b/cucul/font.c
@@ -60,7 +60,7 @@ struct cucul_font
     struct font_header header;
 
     struct block_info *block_list;
-    unsigned long int *user_block_list;
+    uint32_t *user_block_list;
     struct glyph_info *glyph_list;
     uint8_t *font_data;
 
@@ -186,7 +186,7 @@ cucul_font_t *cucul_load_font(void const *data, unsigned int size)
     }
 
     f->user_block_list = malloc((f->header.blocks + 1)
-                                  * 2 * sizeof(unsigned long int));
+                                  * 2 * sizeof(uint32_t));
     if(!f->user_block_list)
     {
         free(f->block_list);
@@ -364,9 +364,9 @@ unsigned int cucul_get_font_height(cucul_font_t const *f)
  *  \param f The font, as returned by cucul_load_font()
  *  \return The list of Unicode blocks supported by the font.
  */
-unsigned long int const *cucul_get_font_blocks(cucul_font_t const *f)
+uint32_t const *cucul_get_font_blocks(cucul_font_t const *f)
 {
-    return (unsigned long int const *)f->user_block_list;
+    return (uint32_t const *)f->user_block_list;
 }
 
 /** \brief Free a font structure.
diff --git a/cucul/line.c b/cucul/line.c
index 2f64ae1..5d56860 100644
--- a/cucul/line.c
+++ b/cucul/line.c
@@ -54,7 +54,7 @@ static void draw_thin_line(cucul_canvas_t*, struct line*);
  *  \return This function always returns 0.
  */
 int cucul_draw_line(cucul_canvas_t *cv, int x1, int y1, int x2, int y2,
-                    unsigned long int ch)
+                    uint32_t ch)
 {
     struct line s;
     s.x1 = x1;
@@ -85,7 +85,7 @@ int cucul_draw_line(cucul_canvas_t *cv, int x1, int y1, int x2, int y2,
  *  \return This function always returns 0.
  */
 int cucul_draw_polyline(cucul_canvas_t *cv, int const x[], int const y[],
-                        int n, unsigned long int ch)
+                        int n, uint32_t ch)
 {
     int i;
     struct line s;
diff --git a/cucul/triangle.c b/cucul/triangle.c
index 1efe9d5..6880556 100644
--- a/cucul/triangle.c
+++ b/cucul/triangle.c
@@ -40,7 +40,7 @@
  *  \return This function always returns 0.
  */
 int cucul_draw_triangle(cucul_canvas_t *cv, int x1, int y1, int x2, int y2,
-                        int x3, int y3, unsigned long int ch)
+                        int x3, int y3, uint32_t ch)
 {
     cucul_draw_line(cv, x1, y1, x2, y2, ch);
     cucul_draw_line(cv, x2, y2, x3, y3, ch);
@@ -87,7 +87,7 @@ int cucul_draw_thin_triangle(cucul_canvas_t *cv, int x1, int y1,
  *  \return This function always returns 0.
  */
 int cucul_fill_triangle(cucul_canvas_t *cv, int x1, int y1, int x2, int y2,
-                        int x3, int y3, unsigned long int ch)
+                        int x3, int y3, uint32_t ch)
 {
     int x, y, xmin, xmax, ymin, ymax;
     long int xx1, xx2, xa, xb, sl21, sl31, sl32;
diff --git a/cxx/cucul++.cpp b/cxx/cucul++.cpp
index ad36912..6b35210 100644
--- a/cxx/cucul++.cpp
+++ b/cxx/cucul++.cpp
@@ -25,19 +25,19 @@
 #include "cucul++.h"
 
 
-unsigned long int Charset::utf8ToUtf32(char const *s, unsigned int *read)
+uint32_t Charset::utf8ToUtf32(char const *s, unsigned int *read)
 {
     return cucul_utf8_to_utf32(s, read);
 }
-unsigned int Charset::utf32ToUtf8(char *buf, unsigned long int ch)
+unsigned int Charset::utf32ToUtf8(char *buf, uint32_t ch)
 {
     return cucul_utf32_to_utf8(buf, ch);
 }
-unsigned char Charset::utf32ToCp437(unsigned long int ch)
+uint8_t Charset::utf32ToCp437(uint32_t ch)
 {
     return cucul_utf32_to_cp437(ch);
 }
-unsigned long int Charset::cp437ToUtf32(unsigned char ch)
+uint32_t Charset::cp437ToUtf32(uint8_t ch)
 {
     return cucul_cp437_to_utf32(ch);
 }
@@ -82,7 +82,7 @@ unsigned int Cucul::getHeight(void)
     return cucul_get_canvas_height(cv);
 }
 
-int Cucul::setColorANSI(unsigned char f, unsigned char b)
+int Cucul::setColorANSI(uint8_t f, uint8_t b)
 {
     return cucul_set_color_ansi(cv, f, b);
 }
@@ -92,12 +92,12 @@ int  Cucul::setColorARGB(unsigned int f, unsigned int b)
     return cucul_set_color_argb(cv, f, b);
 }
 
-void Cucul::putChar(int x, int y, unsigned long int ch)
+void Cucul::putChar(int x, int y, uint32_t ch)
 {
     cucul_put_char(cv, x, y, ch);
 }
 
-unsigned long int Cucul::getChar(int x, int y)
+uint32_t Cucul::getChar(int x, int y)
 {
     return cucul_get_char(cv, x, y);
 }
@@ -156,12 +156,12 @@ void Cucul::Rotate()
     cucul_rotate_180(cv);
 }
 
-void Cucul::drawLine(int x1, int y1, int x2, int y2, unsigned long int ch)
+void Cucul::drawLine(int x1, int y1, int x2, int y2, uint32_t ch)
 {
     cucul_draw_line(cv, x1, y1, x2, y2, ch);
 }
 
-void Cucul::drawPolyline(int const x[], int const y[], int f, unsigned long int ch)
+void Cucul::drawPolyline(int const x[], int const y[], int f, uint32_t ch)
 {
     cucul_draw_polyline(cv, x, y, f, ch);
 }
@@ -176,12 +176,12 @@ void Cucul::drawThinPolyline(int const x[], int const y[], int f)
     cucul_draw_thin_polyline(cv, x, y, f);
 }
 
-void Cucul::drawCircle(int x, int y, int d, unsigned long int ch)
+void Cucul::drawCircle(int x, int y, int d, uint32_t ch)
 {
     cucul_draw_circle(cv, x, y, d, ch);
 }
 
-void Cucul::drawEllipse(int x, int y, int d1, int d2, unsigned long int ch)
+void Cucul::drawEllipse(int x, int y, int d1, int d2, uint32_t ch)
 {
     cucul_draw_ellipse(cv, x, y, d1, d2, ch);
 }
@@ -191,12 +191,12 @@ void Cucul::drawThinEllipse(int x, int y, int d1, int d2)
     cucul_draw_thin_ellipse(cv, x, y, d1, d2);
 }
 
-void Cucul::fillEllipse(int x, int y, int d1, int d2, unsigned long int ch)
+void Cucul::fillEllipse(int x, int y, int d1, int d2, uint32_t ch)
 {
     cucul_fill_ellipse(cv, x, y, d1, d2, ch);
 }
 
-void Cucul::drawBox(int x, int y, int w, int h, unsigned long int ch)
+void Cucul::drawBox(int x, int y, int w, int h, uint32_t ch)
 {
     cucul_draw_box(cv, x, y, w, h, ch);
 }
@@ -211,12 +211,12 @@ void Cucul::drawCP437Box(int x, int y, int w, int h)
     cucul_draw_cp437_box(cv, x, y, w, h);
 }
 
-void Cucul::fillBox(int x, int y, int w, int h, unsigned long int ch)
+void Cucul::fillBox(int x, int y, int w, int h, uint32_t ch)
 {
     cucul_fill_box(cv, x, y, w, h, ch);
 }
 
-void Cucul::drawTriangle(int x1, int y1, int x2, int y2, int x3, int y3, unsigned long int ch)
+void Cucul::drawTriangle(int x1, int y1, int x2, int y2, int x3, int y3, uint32_t ch)
 {
     cucul_draw_triangle(cv, x1, y1, x2, y2, x3, y3, ch);
 }
@@ -226,7 +226,7 @@ void Cucul::drawThinTriangle(int x1, int y1, int x2, int y2, int x3, int y3)
     cucul_draw_thin_triangle(cv, x1, y1, x2, y2, x3, y3);
 }
 
-void Cucul::fillTriangle(int x1, int y1, int x2, int y2, int x3, int y3, unsigned long int ch)
+void Cucul::fillTriangle(int x1, int y1, int x2, int y2, int x3, int y3, uint32_t ch)
 {
     cucul_fill_triangle(cv, x1, y1, x2, y2, x3, y3, ch);
 }
@@ -241,12 +241,12 @@ const char * Cucul::getVersion()
     return cucul_get_version();
 }
 
-int Cucul::setAttr(unsigned long int attr)
+int Cucul::setAttr(uint32_t attr)
 {
     return cucul_set_attr(cv, attr);
 }
 
-unsigned long int Cucul::getAttr(int x, int y)
+uint32_t Cucul::getAttr(int x, int y)
 {
     return cucul_get_attr(cv, x, y);
 }
@@ -394,12 +394,12 @@ unsigned int Font::getHeight()
     return cucul_get_font_height(font);
 }
 
-void Font::renderCanvas(Cucul *cv, unsigned char *buf, unsigned int x, unsigned int y, unsigned int w)
+void Font::renderCanvas(Cucul *cv, uint8_t *buf, unsigned int x, unsigned int y, unsigned int w)
 {
     cucul_render_canvas(cv->get_cucul_canvas_t(), font, buf, x, y, w);
 }
 
-unsigned long int const *Font::getBlocks()
+uint32_t const *Font::getBlocks()
 {
     return cucul_get_font_blocks(font);
 }
diff --git a/cxx/cucul++.h b/cxx/cucul++.h
index b941680..8c933c4 100644
--- a/cxx/cucul++.h
+++ b/cxx/cucul++.h
@@ -38,10 +38,10 @@ class Cucul;
 __class Charset
 {
  public:
-    unsigned long int utf8ToUtf32(char const *, unsigned int *);
-    unsigned int utf32ToUtf8(char *, unsigned long int);
-    unsigned char utf32ToCp437(unsigned long int);
-    unsigned long int cp437ToUtf32(unsigned char);
+    uint32_t utf8ToUtf32(char const *, unsigned int *);
+    unsigned int utf32ToUtf8(char *, uint32_t);
+    uint8_t utf32ToCp437(uint32_t);
+    uint32_t cp437ToUtf32(uint8_t);
 };
 
 /* Ugly, I know */
@@ -53,9 +53,9 @@ __class Font
     char const *const * getList(void);
     unsigned int getWidth();
     unsigned int getHeight();
-    void renderCanvas(Cucul *, unsigned char *, unsigned int,
+    void renderCanvas(Cucul *, uint8_t *, unsigned int,
                                unsigned int, unsigned int);
-    unsigned long int const *getBlocks();
+    uint32_t const *getBlocks();
 
  private:
     cucul_font *font;
@@ -100,13 +100,13 @@ __class Cucul
     void setSize(unsigned int w, unsigned int h);
     unsigned int getWidth(void);
     unsigned int getHeight(void);
-    unsigned long int getAttr(int, int);
-    int setAttr(unsigned long int);
-    int setColorANSI(unsigned char f, unsigned char b);
+    uint32_t getAttr(int, int);
+    int setAttr(uint32_t);
+    int setColorANSI(uint8_t f, uint8_t b);
     int setColorARGB(unsigned int f, unsigned int b);
     void Printf(int x, int y , char const * format, ...);
-    void putChar(int x, int y, unsigned long int ch);
-    unsigned long int getChar(int, int);
+    void putChar(int x, int y, uint32_t ch);
+    uint32_t getChar(int, int);
     void putStr(int x, int y, char *str);
     void Clear(void);
     void Blit(int, int, Cucul* c1, Cucul* c2);
@@ -114,21 +114,21 @@ __class Cucul
     void Flip();
     void Flop();
     void Rotate();
-    void drawLine(int, int, int, int, unsigned long int);
-    void drawPolyline(int const x[], int const y[], int, unsigned long int);
+    void drawLine(int, int, int, int, uint32_t);
+    void drawPolyline(int const x[], int const y[], int, uint32_t);
     void drawThinLine(int, int, int, int);
     void drawThinPolyline(int const x[], int const y[], int);
-    void drawCircle(int, int, int, unsigned long int);
-    void drawEllipse(int, int, int, int, unsigned long int);
+    void drawCircle(int, int, int, uint32_t);
+    void drawEllipse(int, int, int, int, uint32_t);
     void drawThinEllipse(int, int, int, int);
-    void fillEllipse(int, int, int, int, unsigned long int);
-    void drawBox(int, int, int, int, unsigned long int);
+    void fillEllipse(int, int, int, int, uint32_t);
+    void drawBox(int, int, int, int, uint32_t);
     void drawThinBox(int, int, int, int);
     void drawCP437Box(int, int, int, int);
-    void fillBox(int, int, int, int, unsigned long int);
-    void drawTriangle(int, int, int, int, int, int, unsigned long int);
+    void fillBox(int, int, int, int, uint32_t);
+    void drawTriangle(int, int, int, int, int, int, uint32_t);
     void drawThinTriangle(int, int, int, int, int, int);
-    void fillTriangle(int, int, int, int, int, int, unsigned long int);
+    void fillTriangle(int, int, int, int, int, int, uint32_t);
     int setBoundaries(cucul_canvas_t *, int, int, unsigned int, unsigned int);
     unsigned int getFrameCount();
     int setFrame(unsigned int);
diff --git a/ruby/cucul-font.c b/ruby/cucul-font.c
index ff138e2..a76a04c 100644
--- a/ruby/cucul-font.c
+++ b/ruby/cucul-font.c
@@ -71,7 +71,7 @@ static VALUE get_font_height(VALUE self)
 static VALUE get_font_blocks(VALUE self)
 {
     VALUE ary;
-    unsigned long int const *list;
+    uint32_t const *list;
     
     list = cucul_get_font_blocks(_SELF);