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musl - an implementation of the standard library for Linux-based systems
debadaa238
the comparison must take place in the address space model as an integer type, since comparing pointers that are not pointing into the same array is undefined. the subsequent d<s comparison however is valid, because it's only reached in the case where the source and dest overlap, in which case they are necessarily pointing to parts of the same array. to make the comparison, use an unsigned range check for dist(s,d)>=n, algebraically !(-n<s-d<n). subtracting n yields !(-2*n<s-d-n<0), which mapped into unsigned modular arithmetic is !(-2*n<s-d-n) or rather -2*n>=s-d-n. |
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musl libc
musl, pronounced like the word "mussel", is an MIT-licensed
implementation of the standard C library targetting the Linux syscall
API, suitable for use in a wide range of deployment environments. musl
offers efficient static and dynamic linking support, lightweight code
and low runtime overhead, strong fail-safe guarantees under correct
usage, and correctness in the sense of standards conformance and
safety. musl is built on the principle that these goals are best
achieved through simple code that is easy to understand and maintain.
The 1.1 release series for musl features coverage for all interfaces
defined in ISO C99 and POSIX 2008 base, along with a number of
non-standardized interfaces for compatibility with Linux, BSD, and
glibc functionality.
For basic installation instructions, see the included INSTALL file.
Information on full musl-targeted compiler toolchains, system
bootstrapping, and Linux distributions built on musl can be found on
the project website:
http://www.musl-libc.org/