Useful resources

 

C

Compiler support

Language

Headers

Type support

Program utilities

Variadic function support

Error handling

Dynamic memory management

Strings library

Algorithms

Numerics

Date and time utilities

Input/output support

Localization support

Concurrency support (C11)

Technical Specifications

Symbol index

 

C FAQs

• C FAQ — Answers to the frequently asked questions from the Usenet newsgroup comp.lang.c.

C Language and library references

• JTC1/SC22/WG14 — The C Standards Committee, includes draft C language standards, proposals, and defect reports.
  • c89 — C89 draft (html).
  • n1124.pdf — C99 draft (with TC1 and TC2).
  • n1256.pdf — C99 draft (with TC1, TC2, and TC3).
  • n1570.pdf — C11 final working draft.
  • n2176 (C17 FDIS) — C17/C18 final draft.
  • n3220.pdf — C23 first post-publication draft (contains editorial fixes to C23 only).
  • n3435.pdf — C latest public working draft (2025-01-03).
• comp.std.c — Discussion about C language standards.
• GNU C Manual — C core language reference as implemented by the GNU C compiler.

C ABIs

• System V ABI — For x86-64, Intel386, and IA MCU architectures.
• Windows x64 ABI
• PowerPC EABI — For 32-bit embedded processors.
• PowerOpen ABI — For older PowerPC platforms.
• ARM ABI — For ARM architecture.

Related standards

• POSIX.1-2024/IEEE Std 1003.1-2024 — The operating system API of the Unix-compatible systems.
• Linux man pages — The Linux OS API documentation.

Open-source implementations

• Standard library implementations:

• GNU libc
• MUSL
• Newlib
• PDClib

• Compilers:

• GCC
• LLVM Clang
• SDCC

See also

• List of C libraries

C++ documentation for External Links