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Replace it with a simple pathname comparison instead.
The pathname check is not only portable (no need for any
compatibility helper functions), but we can do it much
earlier, and thus make the check much cheaper by avoiding
three extra system calls when it triggers (open/fstat/close).
And the pathname test seems to match all the cases anyway.
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It's disgusting how intimate lib.c is with all the types,
and this is slowly trying to split things up a bit. Now
the intimate part is in allocate.c, but maybe we can get
to the point where each allocation user just declares its
own allocation strategy, and just uses the generic routines
in allocate.c
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up for various system deficiencies.
This makes sparse easier to port to silly things like
MinGW or Solaris. In particular:
- strtold() is a C99 thing, not everybody has it
- MinGW has problems with mmap(MAP_ANONYMOUS) and doesn't zero it.
- st_ino/st_dev is POSIX identity testing, not supported by MinGW
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