The standard you are looking for ISO / IEC 9899 , available from ISO at a low price of 352 Swiss francs. I like to have a standard around, it pays to have an authoritative version, especially when working with a cross-compiler. No matter what you do, do not use Google for C99.pdf, as this may result in the downloading of your copies.
For reference, I like to refer to the Open Group POSIX standard , which also lets you know what the POSIX extension is and what the ISO C99 is.
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