Re: Cannot compile with _FILE_OFFSET_BITS = 64

Ulrich Eckhardt wrote:
Richard Tobin wrote:
In article <5truv2F1f3un6U1@xxxxxxxxxxxxxxxxx>,
Ulrich Eckhardt <doomster@xxxxxxxx> wrote:

lseek64(fd, 4*1024*1024*1024, SEEK_SET) // integer overflow
Others already explained what is happening, but I'd suggest another
approach that works without C99's long long type simply cast the
expression to off_t, which will automatically be the correct 64 bit type,
regardless of whether you use C89 or C99.
Casting the expression won't help, if it's already overflowed as an
int.

Argh, well caught. Casting the first constant in above expression does the
job though.

Uli

You presume the first expression (4) will be evaluated before the last (1024). Why?

--
Joe Wright
"Everything should be made as simple as possible, but not simpler."
--- Albert Einstein ---
.

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