Subj : Re: void interrupt(*oldvects[2])(...); can't compile.
To   : borland.public.cpp.borlandcpp
From : Nathan Witemberg
Date : Thu Dec 09 2004 09:43 am

The code was compiled in Borlands C++ v5.02 using Pentium/233 64mb RAM 
Win95 and it is supposed to be a DOS application and compiled and ran 
without trouble.
I am currently using C++BuilderX Personal 1.0.1786 on XP. I am not 
interested to port the program. I want to compile and run it as it is.

Thanks for the help.

Nathan


Ed Mulroy [TeamB] wrote:

> The code you show appears to be from Serial.CPP, part of a
> Borland tech info document on serial communications for
> Turbo C++ for DOS from around 1989.
> 
> 
>>1. I do not recognize the declaration syntax [what does
>>the (...) mean?
>>2. When trying to compile I get several errors, including:
>>  E2449 Size of 'interrupt' is unknown or zero
>>  E2141 Declaration syntax error at line 29 (the function
>>itself)
> 
> 
> In C and C++ an ellipsis (the three periods) indicate a variable
> argument list.
> 
> The word 'interrupt' is a keyword specific to the compiler.  It
> tells the compiler that the function is set up a specific way,
> a way that is compatible with being called in response to
> a processor interrupt.  In later years the language specifications
> were changed and keywords specific to a given vendor are
> suppossed to begin with an underscore so later compilers
> used _interrupt.  Later still the language committees
> required two instead of one leading underscores, making the
> keyword __interrupt.  For backward compatability, unless
> the ANSI standard option is enabled, all of interrupt,
> _interrupt and __interrupt should be recognized by the compiler.
> 
> What compiler are you using?
> 
> You posted your question both here and in the C++ Builder X
> group.  It is possible that you are trying to write a program for
> Windows.  If so, this is 16 bit DOS code and will not work with
> Windows.
> 
> .  Ed
> 
> 
>>Nathan Witemberg wrote in message
>>news:41b6a585@newsgroups.borland.com...
>>
>>I am having trouble with a serial communication routine (which
>>I didn't write). Specifically with the interrupt handling routine
>>which is the following:
>>
>>void interrupt com_int(void)
>>  /* Handle communications interrupts and put them in ccbuf */
>>  {
>>   disable();
>>   if ((inportb(portbase + IIR) & RX_MASK) == RX_ID)
>>   {
>>     ccbuf[endbuf++] = inportb(portbase + RXR);
>>     endbuf %= SBUFSIZ;
>>   }
>>   /* Signal end of hardware interrupt */
>>   outportb(ICR, EOI);
>>   enable();
>>
>>  } /* com_int */
>>
>>Which is previously declared in an include file as:
>>void  interrupt(*oldvects[2]) (...);
>>
>>1. I do not recognize the declaration syntax [what does
>>the (...) mean?
>>2. When trying to compile I get several errors, including:
>>  E2449 Size of 'interrupt' is unknown or zero
>>  E2141 Declaration syntax error at line 29 (the function
>>itself)
>>
>>I have seen that this is a rather common routine, anybody
>>with experience in serial cummunication? Any clue as how
>>to get past the compile errors?
> 
> 
> 
>

.