Newlib Alternatives

newlib reviews and mentions

• Is strcmp in embedded C safe? If not, what are the usual substitutes?
  2 projects | /r/embedded | 3 Feb 2023

  Swap the arguments is safer, as the first argument is checked for null termination first: https://github.com/eblot/newlib/blob/master/newlib/libc/string/strcmp.c

• What happens if main returns (and nothing happens after)? And: syscalls in embedded?
  1 project | /r/embedded | 31 Dec 2022

  Regarding __libc_init_array(), I found this source code, but I think I don't quite understand; it says about the array of function pointers "These magic symbols are provided by the linker" - to what does __preinit_array_start refer?

• How to make sure no Dynamic Memory is used
  1 project | news.ycombinator.com | 7 Nov 2022

  Any software written for microcontrollers or other low-memory environments is probably not going to use mmap or, more generally, anything that dynamically manipulates memory mappings (if there even is an MMU in the first place).

  That said, the specific use of a function called sbrk seems odd and maybe archaic, since it has no useful role if the heap is fixed-sized anyway. But it looks like newlib uses _sbrk as part of an abstraction that supports many different environments [1], including not just bare metal but also running as a userland program under Linux and other kernels. So maybe it makes sense.

  [1] https://github.com/eblot/newlib/search?q=_sbrk&type=code

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