On Tue, 7 Jan 2014 12:17:03 +0500
Ivanko B <[email protected]> wrote:
> in pascal you can't write functions with variable number of arguments
> AFAIK, "C uses "va_list" lfor that. And C uses the right-2-left stact
> order for procedures to handle "va_list" otherwise Pascal uses the
> left-2-right order making "va_list" handling problematic.Then
> "writeln" might be implemented as a consequence of single "write"-s
> for each argument
No no, freepascal and delphi CAN do that. They have "array of
consts" (or something like that) which you construct with [xx, yy, zz].
The net result is the same as C, and probably more clean.
The problem is that you pass printf() or format() a string and a
handful of arguments:
printf("My name is %s and my age is %d", [myname, myage]);
and there is no check on arguments, and no check on correspondance
between arguments and positional specifiers "%blabla" in the string. In
the example above, the first %s asks for a string, and the second %d for
an integer. If you mistakely pass wrong arguments, or in wrong order
myname and myage, results can be catastrophic!
I tried to use the external function format() in linux libc from
pascal, and I didn't succeed. The problem was that, contrary to what
was stated in the manual, "open array of consts [...]" was not passed
to libc in a working way. I have no problems with delphi, instead; I
often use format() in windows, and every time I do I feel the
deprecating look of Martin behind my shoulders... :-)
Regards,
linuxfan
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