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## Appendix F Contributors to the GNU C Library

The GNU C Library project would like to thank its many contributors. Without them the project would not have been nearly as successful as it has been. Any omissions in this list are accidental. Feel free to file a bug in bugzilla if you have been left out or some of your contributions are not listed. Please keep this list in alphabetical order.

- Ryan S. Arnold for his improvements for Linux on PowerPC.
- Miles Bader for writing the `argp` argument-parsing package, and the `argz`/`envz` interfaces.
- Jeff Bailey for his maintainership of the HPPA architecture.
- Petr Baudis for bug fixes and testing.
- Stephen R. van den Berg for contributing a highly-optimized `strstr` function.
- Ondrej Bilka for contributing optimized string routines for x64.
- Eric Blake for adding O(n) implementations of `memmem`, `strstr` and `strcasestr`.
- Philip Blundell for the ports to Linux/ARM (`arm-`ANYTHING`-linuxaout`) and ARM standalone (`arm-`ANYTHING`-none`), as well as for parts of the IPv6 support code.
- Per Bothner for the implementation of the `libio` library which is used to implement `stdio` functions.
- Mark Brown for his direction as part of the GNU C Library steering committee.
- Thomas Bushnell for his contributions to Hurd.
- Liubov Dmitrieva for optimzed string and math functions on x86-64 and x86.
- Ulrich Drepper for his many contributions in almost all parts of the GNU C Library, including:
  - internationalization support, including the `locale` and `localedef` utilities.
  - Linux i386/ELF support
  - the `hsearch` and `drand48` families of functions, reentrant ‘`...`_r``’ versions of the `random` family; System V shared memory and IPC support code
  - several highly-optimized string functions for ix86 processors
  - many math functions
  - the character conversion functions (`iconv`)
  - the `ftw` and `nftw` functions
  - the floating-point printing function used by `printf` and friends and the floating-point reading function used by `scanf`, `strtod` and friends
  - the `catgets` support and the entire suite of multi-byte and wide-character support functions (`wctype.h`, `wchar.h`, etc.).
  - versioning of objects on the symbol level
- Paul Eggert for the `mktime` function and for his direction as part of the GNU C Library steering committee.
- Tulio Magno Quites Machado Filho for adding a new class of installed headers for low-level platform-specific functionality and one such for PowerPC.
- Mike Frysinger for his maintaining of the IA64 architecture and for testing and bug fixing.
- Michael Glad for the DES encryption function `crypt` and related functions.
- Wolfram Gloger for contributing the memory allocation functions functions `malloc`, `realloc` and `free` and related code.
- Torbjörn Granlund for fast implementations of many of the string functions (`memcpy`, `strlen`, etc.).
- Michael J. Haertel for writing the merge sort function `qsort` and malloc checking functions like `mcheck`.
- Bruno Haible for his improvements to the `iconv` and locale implementations.
- Richard Henderson for the port to Linux on Alpha (`alpha-`anything`-linux`).
- David Holsgrove for the port to Linux on MicroBlaze.
- Daniel Jacobowitz for various fixes and enhancements.
- Andreas Jaeger for the port to Linux on x86-64 (`x86_64-`anything`-linux` and his work on Linux for MIPS (`mips-`anything`-linux`), implementing the `ldconfig` program, providing a test suite for the math library and for his direction as part of the GNU C Library steering committee.
- Aurelien Jarno for various fixes.
- Jakub Jelinek for implementing a number of checking functions and for his direction as part of the GNU C Library steering committee.
- Geoffrey Keating for the port to Linux on PowerPC (`powerpc-`anything`-linux`).
- Brendan Kehoe for contributing the port to the MIPS DECStation running Ultrix 4 (`mips-dec-ultrix4`) and the port to the DEC Alpha running OSF/1 (`alpha-dec-osf1`).
- Mark Kettenis for implementing the `utmpx` interface and an utmp daemon, and for a Hesiod NSS module.
- Andi Kleen for implementing pthreads lock elision with TSX.
- Kazumoto Kojima for the port of the Mach and Hurd code to the MIPS architecture (`mips-`anything`-gnu`) and for his work on the SH architecture.
- Andreas Krebbel for his work on Linux for s390 and s390x.
- Thorsten Kukuk for providing an implementation for NIS (YP) and NIS+, securelevel 0, 1 and 2 and for the implementation for a caching daemon for NSS (`nscd`).
- Jeff Law for various fixes.
- Doug Lea for contributing the memory allocation functions functions `malloc`, `realloc` and `free` and related code.
- Hongjiu Lu for providing the support for a Linux 32-bit runtime environment under x86-64 (x32), for porting to Linux on IA64, for improved string functions, a framework for testing IFUNC implementations, and many bug fixes.
- Luis Machado for optimized functions on PowerPC.
- David J. MacKenzie for his contribution to the `getopt` function and writing the `tar.h` header.
- Greg McGary for adding runtime support for bounds checking.
- Roland McGrath for writing most of the GNU C Library originally, for his work on the Hurd port, his direction as part of the GNU C Library steering committee, and for many bug fixes and reviewing of contributions.
- Jason Merrill for the port to the Sequent Symmetry running Dynix version 3 (`i386-sequent-bsd`).
- Chris Metcalf for the port to Linux/Tile (`tilegx-`anything`-linux` and `tilepro-`anything`-linux`).
- David Miller for contributing the port to Linux/Sparc (`sparc*-`anything`-linux`).
- Alan Modra for his improvements for Linux on PowerPC.
- David Mosberger-Tang for contributing the port to Linux/Alpha (`alpha-`anything`-linux`).
- Stephen Moshier for implementing some 128-bit long double format math functions.
- Stephen Munroe for his port to Linux on PowerPC64 (`powerpc64-`anything`-linux`) and for adding optimized implementations for PowerPC.
- Joseph S. Myers for numerous bug fixes for the libm functions, for his maintainership of the ARM and MIPS architectures, improving cross-compilation and cross-testing of the GNU C Library, expanded coverage of conformtest, and merging the ports/ subdirectory into the GNU C Library main repository.
- Will Newton for contributing an optimized memcpy for ARM NEON and VFP chips.
- Carlos O'Donell for his maintainership of the HPPA architecture and maintaining the GNU C Library web pages.
- Alexandre Oliva for adding TLS descriptors for LD and GD on x86 and x86-64, for the am33 port, for completing the MIPS n64/n32/o32 multilib port, and for various fixes.
- Paul Pluzhnikov for various fixes.
- Marek Polacek for various fixes.
- Siddhesh Poyarekar for various fixes and an implementation of a framework for performance benchmarking of functions.
- Tom Quinn for contributing the startup code to support SunOS shared libraries and the port to SGI machines running Irix 4 (`mips-sgi-irix4`).
- Pravin Satpute for writing sorting rules for some Indian languages.
- Douglas C. Schmidt for writing the quick sort function used as a fallback by `qsort`.
- Will Schmidt for optimized string functions on PowerPC.
- Andreas Schwab for the port to Linux/m68k (`m68k-`anything`-linux`) and for his direction as part of the GNU C Library steering committee.
- Martin Schwidefsky for porting to Linux on s390 (`s390-`anything`-linux`) and s390x (`s390x-`anything`-linux`).
- Thomas Schwinge for his contribution to Hurd and the SH architecture.
- Carlos Eduardo Seo for optimized functions on PowerPC.
- Marcus Shawcroft for contributing the AArch64 port.
- Franz Sirl for various fixes.
- Jes Sorensen for porting to Linux on IA64 (`ia64-`anything`-linux`).
- Richard Stallman for his contribution to the `getopt` function.
- Alfred M. Szmidt for various fixes.
- Ian Lance Taylor for contributing the port to the MIPS DECStation running Ultrix 4 (`mips-dec-ultrix4`).
- Samuel Thibault for improving the Hurd port.
- Tim Waugh for the implementation of the POSIX.2 `wordexp` function family.
- Eric Youngdale for implementing versioning of objects on the symbol level.
- Adhemerval Zanella for optimized functions on PowerPC.

Some code in the GNU C Library comes from other projects and might be under a different license:

- The timezone support code is derived from the public-domain timezone package by Arthur David Olson and his many contributors.
- Some of the support code for Mach is taken from Mach 3.0 by CMU; the file if_ppp.h is also copyright by CMU, but under a different license; see the file `LICENSES` for the text of the licenses.
- The random number generation functions `random`, `srandom`, `setstate` and `initstate`, which are also the basis for the `rand` and `srand` functions, were written by Earl T. Cohen for the University of California at Berkeley and are copyrighted by the Regents of the University of California. They have undergone minor changes to fit into the GNU C Library and to fit the ISO C standard, but the functional code is Berkeley's.
- The Internet-related code (most of the `inet` subdirectory) and several other miscellaneous functions and header files have been included from 4.4 BSD with little or no modification. The copying permission notice for this code can be found in the file `LICENSES` in the source distribution.
- The `getaddrinfo` and `getnameinfo` functions and supporting code were written by Craig Metz; see the file `LICENSES` for details on their licensing.
- The DNS resolver code is taken directly from BIND 4.9.5, which includes copyrighted code from UC Berkeley and from Digital Equipment Corporation. See the file `LICENSES` for the text of the DEC license.
- The code to support Sun RPC is taken verbatim from Sun's rpcsrc-4.0 distribution; see the file `LICENSES` for the text of the license.
- The math functions are taken from `fdlibm-5.1` by Sun Microsystems, as modified by J.T. Conklin, Ian Lance Taylor, Ulrich Drepper, Andreas Schwab, and Roland McGrath.
- Many of the IEEE 64-bit double precision math functions (in the `sysdeps/ieee754/dbl-64` subdirectory) come from the IBM Accurate Mathematical Library, contributed by IBM.
- Many of the IA64 math functions are taken from a collection of “Highly Optimized Mathematical Functions for Itanium” that Intel makes available under a free license; see the file `LICENSES` for details.