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the UTF-8 output code was written assuming an invariant that iconv's decoders only emit valid Unicode Scalar Values which wctomb can encode successfully, thereby always returning a value between 1 and 4. if this invariant is not satisfied, wctomb returns (size_t)-1, and the subsequent adjustments to the output buffer pointer and remaining output byte count overflow, moving the output position backwards, potentially past the beginning of the buffer, without storing any bytes.
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/