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documentation updates, EnterDesktop() is equal to exit(0)
git-svn-id: svn://svn.cc65.org/cc65/trunk@2361 b7a2c559-68d2-44c3-8de9-860c34a00d81
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izydorst
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@ -549,6 +549,9 @@ after a click. Otherwise the user must choose an icon.
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<p>
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Note: use it if you really need (or if you will use it in many places) as
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it adds quite amount of code to your program.
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<p>
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Note: the formatted text <em/cannot exceed/ 255 bytes in length, there is no check
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for that.
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<sect1>Mouse, Sprites and Cursors
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<p>
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@ -796,7 +799,7 @@ struct tr_se myTrSe;
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<p>
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In this example <tt/otherTrSe/ can be replaced by <tt/myTrSe/.
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<p>
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NOTE that you <em/must/ use casting to have correct values.
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Note: you <em/must/ use casting to have correct values.
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<sect2>Low-level disk IO
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<p>
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@ -1071,12 +1074,14 @@ This function will load or save at most <tt/fLength/ bytes from currently pointe
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Functions covered in this section are common for whole C world - copying memory parts and
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strings is one of the main computer tasks. GEOS also has interface to do this. These functions
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are replacement for those like <tt/memset, memcpy, strcpy/ etc. from standard libraries.
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If you are dealing with short strings (up to 255 characters) you should use these functions
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instead of standard ones. E.g. <tt/CopyString/ instead of <tt/strcpy/. It will work faster.
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<p>
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However some of them have slighty different calling convention (order of arguments to be specific),
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so please check their syntax here before direct replacing.
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Please note that the memory described as <em/strings/ are up to 255 characters (without
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counting the terminating <tt/NULL/), and <em/regions/ cover whole 64K of memory.
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<p>
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Please note that the memory areas described here as <em/strings/ are up to 255 characters (without
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counting the terminating <tt/NULL/), and <em/regions/ can cover whole 64K of memory.
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<sect2>CopyString
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<p>
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@ -1146,7 +1151,8 @@ This is done with <tt/table/ where everything is defined. See structures chapter
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<tt/ char VerifyRAM (char bank, unsigned length, char *reuAddress, char *cpuAddress)/
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<p>
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These functions are interface to REU - Ram Expansion Unit. I think that they are self-explanatory.
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You can check for REU presence by taking value of <tt/ramExpSize/.
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You can check for REU presence by taking value of <tt/ramExpSize/. You have to do it before
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using any of these functions.
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<sect1>Processes and Multitasking
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<p>
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@ -1208,18 +1214,18 @@ It means that if you call <tt/UnBlockProcess/ before timer runs out, the process
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<tt/void UnFreezeProcess (char processNumber)/
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<p>
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<tt/FreezeProcess/ disables timer for given process. <tt/UnFreezeProcess/ does the opposite.
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This is not equal to <tt/RestartProcess/ as timers are not filled with initial value.
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This is not equal to <tt/RestartProcess/ as timers are not reloaded with initial value.
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<sect2>Sleep
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<p>
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<tt/void Sleep (unsigned jiffies)/
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<p>
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This function is multitasking sleep - the program is halted, but it doesn't block other functions.
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The only argument here is the number of jiffies to wait until app will wake up.
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<p>
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You can force to sleep not only the main application routine, but also processes-tasks. Be warned
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that the maximum number of sleeping functions is 20. If it would be larger it will overwrite
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parameters of already sleeping functions in GEOS kernal data space, leading to crash.
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This function is multitasking sleep - the program is halted, but it doesn't block other functions
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e.g. callbacks from menus and icons.
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The only argument here is the number of jiffies to wait until app will wake up. It depends on
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video mode (PAL or NTSC) how many jiffies there are per second (50 or 60, respectively).
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If you don't want to worry about it and need only full second resolution, call standard
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<tt/sleep/ function from <tt/unistd.h/.
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<sect1>System Functions
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@ -1237,7 +1243,8 @@ up. You shouldn't use this unless you know what you are doing.
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<tt/void DoneWithIO (void)/
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<p>
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These functions are called by some disk routines. You should call them only if you want to
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do something with IO registers or call one of Kernal's routines.
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do something with IO registers or call one of Kernal ROM routines. Note that this is rather an
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expensive way of turning off IRQs and enabling IO.
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<sect2>MainLoop
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<p>
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@ -1252,10 +1259,9 @@ proper handlers before that.
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<p>
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<tt/void EnterDeskTop (void)/
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<p>
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Calling this function will instantly terminate your program and bring you back to DeskTop.
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WARNING! It is not an equivalent of <tt/exit()/, library destructors code and functions
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registered with <tt/atexit()/ will not be called. In fact, you should always use
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<tt/exit()/ instead.
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This is an alias for <tt/exit(0)/ so you will never burn yourself. Anyway, you should not
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use it. Always use <tt/exit()/ instead. Library destructors and functions registered with
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<tt/atexit()/ are called.
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<sect2>ToBASIC
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<p>
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@ -1263,7 +1269,9 @@ registered with <tt/atexit()/ will not be called. In fact, you should always use
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<p>
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This one is another way of finishing application - forcing GEOS to shutdown and exit to BASIC.
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I was considering whether to include it or not, but maybe someone will need it. Which is I doubt.
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It has the same dangerous features as <tt/EnterDeskTop/.
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<p>
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<em/WARNING:/ library destructors and functions registered with <tt/atexit()/ will not be called
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so it is quite unsafe way to finish your program.
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<sect2>Panic
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<p>
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@ -1344,7 +1352,7 @@ definitions of returned values.
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<p>
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To simplify usage and optimize passing parameters to functions I have declared several structures
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which describe most common objects. Some of these structures are bound to static addresses in
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GEOS data space ($8000-$8fff), so you can use their fields directly in optimized way.
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GEOS data space (<tt/$8000-$8fff/), so you can use their fields directly in optimized way.
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Please see <tt/gsym.h/ and find them. All structures are defined in <tt/gstruct.h/ and you may
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find also some comments there.
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@ -1358,7 +1366,7 @@ One simple structure describing a point on the screen.
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<p>
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This structure describes a font in one pointsize. There is current font - <tt/struct fontdesc/
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bound to <tt/curFontDesc/. You can also force GEOS to use your own fonts by calling
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<tt/LoadCharSet/. You just need to open a VLIR font file and load one record - one pointsize
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<tt/LoadCharSet/. You just need to open a VLIR font file and load one record - one pointsize -
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somewhere. At the start of this area you already have all data for <tt/fontdesc/ so you can
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pass a pointer to the load adress of that pointsize to <tt/LoadCharSet/. (Note that although
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it has 'Load' in the name, that function loads only GEOS internal data structures, not data
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@ -9,4 +9,7 @@
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.import _exit
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.export _EnterDeskTop
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_EnterDeskTop = _exit
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_EnterDeskTop:
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lda #0
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tax
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jmp _exit
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