# Utility library

From cppreference.com
< c

C includes a variety of utility libraries. These libraries can be broadly divided into two groups:

- language support libraries, and
- general-purpose libraries.

## Language support

Language support libraries provide functions that interact closely with language features and support common language idioms.

### Type support

Basic types (e.g. size_t, NULL)

### Dynamic memory management

(e.g. malloc)

### Error handling

Assertions (e.g. assert)

### Variadic functions

Support for functions that take an arbitrary number of parameters (via e.g. va_start, va_arg, va_end)

## General-purpose utilities

### Program utilities

Termination (e.g. abort, atexit), environment (e.g. system), signals (e.g. raise)

### Date and time

Time tracking (e.g. time, clock)

### See also

C++ documentation for Utility library

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