[libc-commits] [PATCH] D119403: Introduce getenv to LLVM libc

[Raman Tenneti via Phabricator via libc-commits]

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Add support for getenv as defined by the Open Group's "System Interface &
 Header" in https://pubs.opengroup.org/onlinepubs/7908799/xsh/getenv.html

getenv requires a standard way of accessing the environment,
so a pointer to the environment is added to the startup in crt1.
Consquently, this function is not usable on top of other libcs.

Added starts_with method to StringView. getenv function uses it.

Co-authored-by: Jeff Bailey <jeffbailey at google.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119403

Files:
  libc/config/linux/aarch64/entrypoints.txt
  libc/config/linux/app.h
  libc/config/linux/x86_64/entrypoints.txt
  libc/loader/linux/x86_64/start.cpp
  libc/spec/posix.td
  libc/src/__support/CPP/StringView.h
  libc/src/stdlib/CMakeLists.txt
  libc/src/stdlib/getenv.cpp
  libc/src/stdlib/getenv.h
  libc/test/loader/linux/CMakeLists.txt
  libc/test/loader/linux/getenv_test.cpp
  libc/test/loader/linux/loader_test.h
  libc/test/utils/CPP/stringview_test.cpp

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