use of goto in C
in [ASM]
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From: Esra Sdrawkcab on 27 Apr 2010 02:33 On Mon, 26 Apr 2010 15:02:57 +0200, Robert Redelmeier <redelm(a)ev1.net.invalid> wrote: [editor with key processing] > In ASM (or C if it'll do this), you'd implement via a jmp table > (`jmp [ebx]`) and terminate each of the letter functions with > `jmp keyloop`. Or the equivalent call [ebx]/ret. More or > less how the C compiler will code it anyways. Pshurely 'call [ebx]' and end each section with 'ret', no goto required? > obTroll: In many ways, GOTO is reminiscent of the slightly > more recent calculator debate between fans of TI algebraic > notation and HP reverse polish notation. Damn, missed that! betterTroll: what about Comefrom? > > -- Robert > Needs a CRLF in there? -- Nuns! Nuns! Reverse
From: Alexei A. Frounze on 27 Apr 2010 04:43 On Apr 26, 11:38 pm, "Rod Pemberton" <do_not_h...(a)havenone.cmm> wrote: > "Alexei A. Frounze" <alexfrun...(a)gmail.com> wrote in messagenews:3175dd42-6ff2-452b-af2e-93de277ec661(a)t14g2000prm.googlegroups.com... > On Apr 26, 2:06 am, "Rod Pemberton" <do_not_h...(a)havenone.cmm> wrote: > > > > > while(0 /*shouldn't it actually be 1 because with 0 it > > won't execute even once*/) > > Eee... Good catch! Sorry, that doesn't work. > > But, no, definately not "while(1)"... That'd would be a loop. How about > "do {} while(0)"... With a "break" or "continue", we should have a forward > or backward goto. If the "break" or "continue" is not executed, the entire > section only executes once, as if the "do {} while(0)" was not there. > Hopefully, that's correct this time? > > :-) > > Rod Pemberton That (do {} while(0)) is a possibility and it is sometimes used for other purposes. Also, you could just put a break at the end of while(1)/for(;;)'s block. Alex
From: Robert Redelmeier on 27 Apr 2010 23:38 In alt.lang.asm Esra Sdrawkcab <admin(a)127.0.0.1> wrote in part: > [editor with key processing] > Pshurely 'call [ebx]' and end each section with 'ret', no goto required? Certainly if you wish to reuse the commands between different modes. Less if you are desparately counting cycles on an 8088 (jmp saves a jmp after the ret). Also less good if the key never returns "exit". >> obTroll: In many ways, GOTO is reminiscent of the slightly >> more recent calculator debate between fans of TI algebraic >> notation and HP reverse polish notation. > > Damn, missed that! > > betterTroll: what about Comefrom? ??? what is even slightly trollish about COMEFROM? It is an obvious debugging tool with _plenty_ of hardware support (brkpt instructions & debug registers). If someone chooses to use COMEFROM in their code, they must think their code has bugs. They would know :) >> -- Robert >> > Needs a CRLF in there? 'dems fightin' words. You callin' me MS-DOSish :) Yes, I realize \n is old-school correct from when people (incl me) had real paper ttys. I tr to save readers an extra line on their too-short read-boxes. (I normally run monitors in portrait mode with 100+ lines). -- Robert >
From: Nathan Baker on 28 Apr 2010 01:00 "Robert Redelmeier" <redelm(a)ev1.net.invalid> wrote in message news:hr8ak7$vhk$1(a)speranza.aioe.org... > > modes. Less if you are desparately counting cycles on an 8088 > (jmp saves a jmp after the ret). Don't you mean that a 'jmp' saves a 'ret' after a 'ret'?? For nested calls, the final call can be replaced by a jmp. E.g.: ,--- Afunc: <misc. code & func calls> call Zfunc `--- replaced by... ,--- Afunc: <misc. code & func calls> jmp Zfunc `--- Nathan.
From: Esra Sdrawkcab on 28 Apr 2010 08:58
On Wed, 28 Apr 2010 04:38:47 +0100, Robert Redelmeier <redelm(a)ev1.net.invalid> wrote: > In alt.lang.asm Esra Sdrawkcab <admin(a)127.0.0.1> wrote in part: >> [editor with key processing] > >> Pshurely 'call [ebx]' and end each section with 'ret', no goto required? > > Certainly if you wish to reuse the commands between different > modes. Less if you are desparately counting cycles on an 8088 > (jmp saves a jmp after the ret). Also less good if the key > never returns "exit". > Fairy 'nuff. But we're looking at speed, not (lack of) "Goto"s then. >>> obTroll: In many ways, GOTO is reminiscent of the slightly >>> more recent calculator debate between fans of TI algebraic >>> notation and HP reverse polish notation. >> >> Damn, missed that! >> >> betterTroll: what about Comefrom? > > ??? what is even slightly trollish about COMEFROM? > > It is an obvious debugging tool with _plenty_ of > hardware support (brkpt instructions & debug registers). > > If someone chooses to use COMEFROM in their code, they > must think their code has bugs. They would know :) > >>> -- Robert >>> >> Needs a CRLF in there? > > 'dems fightin' words. You callin' me MS-DOSish :) > > Yes, I realize \n is old-school correct from when people (incl > me) had real paper ttys. I tr to save readers an extra line on > their too-short read-boxes. (I normally run monitors in portrait > mode with 100+ lines). > > -- Robert > Ok a newline then! I was taught sig sep should be newline dash dash space newline. > >> -- Nuns! Nuns! Reverse |