Library Functions provided by the compiler, are they portable?
i.e. is there any ANCI C standards for these functions.
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
gcc compiler does not define <conio.h> header file.
11  4395 
santosh wrote: Library Functions provided by the compiler, are they portable?
i.e. is there any ANCI C standards for these functions.
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
gcc compiler does not define <conio.h> header file.
If you stick with the standard C library as specified in the C standard,
your code will be portable.
gcc doesn't provide <conio.h>, Windows does.
--
Ian Collins.
santosh wrote: Library Functions provided by the compiler, are they portable?
Not all. There may be some functions specific to your compiler like
getch() which you have pointe dout below.
i.e. is there any ANCI C standards for these functions.
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
gcc compiler does not define <conio.h> header file. http://www-ccs.ucsd.edu/c/lib_over.html
"santosh" <sa***********@ gmail.com> writes: Library Functions provided by the compiler, are they portable?
i.e. is there any ANCI C standards for these functions.
Some are standard, some aren't. Search for "n1124.pdf" to see the
most current draft of the standard; section 7 defines the standard
library. Implementations typically provide additional functions.
(Ideally your documentation should tell you which functions are
standard and which ones are not.)
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
gcc compiler does not define <conio.h> header file.
Neither getch() nor <conio.h> is defined by the C standard.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <*> <http://users.sdsc.edu/~kst>
We must do something. This is something. Therefore, we must do this.
santosh wrote: Library Functions provided by the compiler, are they portable?
i.e. is there any ANCI C standards for these functions.
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
gcc compiler does not define <conio.h> header file.
No, there is no standard on the contents of headers provided by the
compiler, which are not described by the standard. Nor is there any
standard which says a gcc installation, on Windows or elsewhere, should
define such functions in the same named header file as a compiler you
associate more closely with a certain operating system.
gcc itself is parsimonious about providing headers not defined in the
standard. Quite likely, a header and library for a nonstandard function
like this is optional and can be installed or not, as you choose.
santosh said: Library Functions provided by the compiler, are they portable?
Not all of them, no.
i.e. is there any ANCI C standards for these functions.
You mean ANSI? Well, all the ones that are defined by ANSI are portable
across all hosted implementations , and so *must* be provided by the
implementation.
eg. getch() function defined in <conio.h> header file works fine in
windows C compiler but gcc compiler in linux does not recognise it.
It would if you added #include <curses.h> BUT it wouldn't be the same
getch(). It doesn't do the same job. That's one slightly less obvious snag
with non-portable functions such as getch().
gcc compiler does not define <conio.h> header file.
Right.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
Ian Collins said: gcc doesn't provide <conio.h>, Windows does.
Not true. It is supplied by some implementations , not by the OS. In any
case, it pre-dates Windows.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)
Richard Heathfield wrote: Ian Collins said:
gcc doesn't provide <conio.h>, Windows does.
Not true. It is supplied by some implementations , not by the OS. In any
case, it pre-dates Windows.
OK, half true - gcc doesn't provide it :)
If rusty grey cells can be trusted, I think it was a DOS header?
--
Ian Collins.
Ian Collins wrote: Richard Heathfield wrote: Ian Collins said:
gcc doesn't provide <conio.h>, Windows does.
Not true. It is supplied by some implementations , not by the OS. In any
case, it pre-dates Windows.
OK, half true - gcc doesn't provide it :)
If rusty grey cells can be trusted, I think it was a DOS header?
It was in Turbo C 1.0 & 2.0 and Borland C++ version 3.1. Used to provide
"windowing" functions in DOS or in a DOS box under Windows. Provided
things like gotoXY(), TextColor(), TextBackground( ), window() and so on.
As far as I know that was the only place conio.h existed
Alan
Ian Collins said: Richard Heathfield wrote: Ian Collins said:
gcc doesn't provide <conio.h>, Windows does.
Not true. It is supplied by some implementations , not by the OS. In any
case, it pre-dates Windows.
OK, half true - gcc doesn't provide it :)
If rusty grey cells can be trusted, I think it was a DOS header?
Not so. It is supplied by some implementations , not by the OS.
Borland provided a conio.h header in Turbo C. So, I believe, did Microsoft
in their own (cough) implementation - but with different contents. DJGPP
also provides one which consciously emulates Borland's.
And Zog C provides one too. See the following URL: http://dspace.dial.pipex.com/town/green/gfd34/art/
Click on Software link when you get there - don't worry, it's just passive
HTML.
--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999 http://www.cpax.org.uk
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