On Thu, 2005-Aug-04 10:26:37 +0100, David Malone wrote: >On Thu, Aug 04, 2005 at 05:57:11PM +1000, Peter Jeremy wrote: >> That said, I've seen similar behaviour on other systems so it could be >> a subtle side-effect of POSIX. > >There are some magic things about fseek in the C standard - I wonder >if this could be related to them. For example (from C99) in the >commentry on fopen: [read/write switching] I don't see anything there that mandates the existing behaviour. The existing behaviour may be a simple way to implement the requirements but a more efficient way would seem to be to use flags to allow read/write switching and only reload the buffer if the next I/O operation specifies a different direction to the previous one. >Could what stdio is doing be related to flushing ungetc? The ungetc buffer is separate to the normal I/O buffer. Flushing it shouldn't require the normal I/O buffer to be re-read. -- Peter JeremyReceived on Thu Aug 04 2005 - 17:04:44 UTC
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