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b2020571f0
the way gets was implemented in terms of fgets, it used the location of the null termination to determine where to find and remove the newline, if any. an embedded null byte prevented this from working. this also fixes a one-byte buffer overflow, whereby when gets read an N-byte line (not counting newline), it would store two null terminators for a total of N+2 bytes. it's unlikely that anyone would care that a function whose use is pretty much inherently a buffer overflow writes too much, but it could break the only possible correct uses of this function, in conjunction with input of known format from a trusted/same-privilege-domain source, where the buffer length may have been selected to exactly match a line length contract. there seems to be no correct way to implement gets in terms of a single call to fgets or scanf, and using multiple calls would require explicit locking, so we might as well just write the logic out explicitly character-at-a-time. this isn't fast, but nobody cares if a catastrophically unsafe function that's so bad it was removed from the C language is fast.
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/