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fgetwc does not set the stream's error indicator on encoding errors,
making ferror insufficient to distinguish between error and eof
conditions. feof is also insufficient, since it will return true if
the file ended with a partial character encoding error.
whether fgetwc should be setting the error indicator itself is a
question with conflicting answers. the POSIX text for the function
states it as a requirement, but the ISO C text seems to require that
it not. this may be revisited in the future based on the outcome of
Austin Group issue #1170.
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this header evolved to facilitate the extremely lazy practice of
omitting explicit includes of the necessary headers in individual
stdio source files; not only was this sloppy, but it also increased
build time.
now, stdio_impl.h is only including the headers it needs for its own
use; any further headers needed by source files are included directly
where needed.
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to deal with the fact that the public headers may be used with pre-c99
compilers, __restrict is used in place of restrict, and defined
appropriately for any supported compiler. we also avoid the form
[restrict] since older versions of gcc rejected it due to a bug in the
original c99 standard, and instead use the form *restrict.
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