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Own getchar function
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If you would have to write your own implementation of the
function getchar() in C; how would you do it?.
function getchar() in C; how would you do it?.
Last edited by Aia; Apr 8th, 2007 at 2:22 am.
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Originally Posted by Aia 
If you would have to write your own implementation of the
function getchar() in C; how would you do it?.
The 3 Laws of the Procrastination Society:
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
1) Never do today that which can be put off until tomorrow
2) Tomorrow never comes
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Originally Posted by Aia
If you would have to write your own implementation of the
function getchar() in C; how would you do it?.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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getc_unlocked() and getchar_unlocked() functions conform to IEEE Std 1003.1-2001
(POSIX.1). so every *nix (mac is *nix below the hood) should have them as part of the
base system. (in linux, it would be in glibc.)
"getc_unlocked() and getchar_unlocked()functions are equivalent to getc() & getchar()
respectively, except that the caller is responsible for locking the stream with
flockfile(3) before calling them. These functions may be used to avoid the
overhead of locking the stream for each character, and to avoid input being
dispersed among multiple threads reading from the same stream."
-- from freebsd man pages.
i guess most *nix implementations would implement getchar as
flockfile, getchar_unlocked, unflockfile
(POSIX.1). so every *nix (mac is *nix below the hood) should have them as part of the
base system. (in linux, it would be in glibc.)
"getc_unlocked() and getchar_unlocked()functions are equivalent to getc() & getchar()
respectively, except that the caller is responsible for locking the stream with
flockfile(3) before calling them. These functions may be used to avoid the
overhead of locking the stream for each character, and to avoid input being
dispersed among multiple threads reading from the same stream."
-- from freebsd man pages.
i guess most *nix implementations would implement getchar as
flockfile, getchar_unlocked, unflockfile
Last edited by vijayan121; Apr 8th, 2007 at 9:59 am. Reason: formatting
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