X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;ds=sidebyside;f=src%2Fgestalt.c;h=4b3b19c0a3e5af913fdd06b75dea46c78062c0d9;hb=3c7e09ffabd2962b5345c906b4d46757b796a4da;hp=1bb7f7e9c5bda60308a37c6b10e818ac5609562a;hpb=6b88d5630371fa1633b8f0dcd9f6c92efc315e6d;p=rodin%2Fchimara.git
diff --git a/src/gestalt.c b/src/gestalt.c
index 1bb7f7e..4b3b19c 100644
--- a/src/gestalt.c
+++ b/src/gestalt.c
@@ -27,11 +27,37 @@ glk_gestalt(glui32 sel, glui32 val)
* @sel: A selector, representing which capability to request information
* about.
* @val: Extra information, depending on the value of @sel.
- * @arr: Location of an array to store extra information in, or #NULL.
- * @arrlen: Length of @arr, or 0 if @arr is #NULL.
+ * @arr: Location of an array to store extra information in, or %NULL.
+ * @arrlen: Length of @arr, or 0 if @arr is %NULL.
*
- * Calls the gestalt system to request information about selector @sel,
- * possibly returning information in @arr.
+ * Calls the gestalt system to request information about the capabilities of the
+ * API. The selector @sel tells which capability you are requesting information
+ * about; the other three arguments are additional information, which may or may
+ * not be meaningful. The @arr and @arrlen arguments of glk_gestalt_ext() are
+ * always optional; you may always pass %NULL and 0, if you do not want whatever
+ * information they represent. glk_gestalt() is simply a shortcut for this;
+ * #glk_gestalt(x, y)
is exactly the same as
+ * #glk_gestalt_ext(x, y, %NULL, 0)
.
+ *
+ * The critical point is that if the Glk library has never heard of the selector
+ * @sel, it will return 0. It is always safe to call
+ * #glk_gestalt(x, y)
(or #glk_gestalt_ext(x, y, %NULL,
+ * 0)
). Even if you are using an old library, which was compiled before
+ * the given capability was imagined, you can test for the capability by calling
+ * glk_gestalt(); the library will correctly indicate that it does not support
+ * it, by returning 0.
+ *
+ * (It is also safe to call #glk_gestalt_ext(x, y, z, zlen)
for an
+ * unknown selector x
, where z
is not %NULL, as long
+ * as z
points at an array of at least zlen
elements.
+ * The selector will be careful not to write beyond that point in the array, if
+ * it writes to the array at all.)
+ *
+ * (If a selector does not use the second argument, you should always pass 0; do
+ * not assume that the second argument is simply ignored. This is because the
+ * selector may be extended in the future. You will continue to get the current
+ * behavior if you pass 0 as the second argument, but other values may produce
+ * other behavior.)
*
* Returns: an integer, depending on what selector was called.
*/
@@ -44,6 +70,20 @@ glk_gestalt_ext(glui32 sel, glui32 val, glui32 *arr, glui32 arrlen)
case gestalt_Version:
return (MAJOR_VERSION << 16) + (MINOR_VERSION << 8) + SUB_VERSION;
+ /* Which characters can the player type in line input? */
+ case gestalt_LineInput:
+ /* Does not accept control chars */
+ if( val < 32 || (val >= 127 && val <= 159) )
+ return 0;
+ return 1;
+
+ /* Which characters can the player type in char input? */
+ case gestalt_CharInput:
+ /* Does not accept control chars or unknown */
+ if( val < 32 || (val >= 127 && val <= 159) || val == keycode_Unknown )
+ return 0;
+ return 1;
+
/* Which characters can we print? */
case gestalt_CharOutput:
/* All characters are printed as one character, in any case */
@@ -54,7 +94,23 @@ glk_gestalt_ext(glui32 sel, glui32 val, glui32 *arr, glui32 arrlen)
return gestalt_CharOutput_CannotPrint;
/* Can print all other Latin-1 characters */
return gestalt_CharOutput_ExactPrint;
+
+ /* Unicode capabilities present */
+ case gestalt_Unicode:
+ return 1;
+ /* Unsupported capabilities */
+ case gestalt_MouseInput:
+ case gestalt_Timer:
+ case gestalt_Graphics:
+ case gestalt_DrawImage:
+ case gestalt_Sound:
+ case gestalt_SoundVolume:
+ case gestalt_SoundNotify:
+ case gestalt_Hyperlinks:
+ case gestalt_HyperlinkInput:
+ case gestalt_SoundMusic:
+ case gestalt_GraphicsTransparency:
/* Selector not supported */
default:
return 0;