# Dynamic memory extensions

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< c‎ | experimental

Extensions to the C Library Part II: Dynamic Allocation Functions, ISO/IEC TR 24731-2:2010, defines the following new components for the C standard library:

__STDC_ALLOC_LIB__ | integer constant of type long indicating conformance level (macro constant)
Defined in header `<stdio.h>`
fmemopen (dynamic memory TR) | opens a fixed-size memory buffer as an I/O stream (function)
open_memstream open_wmemstream (dynamic memory TR) | opens a dynamically resized memory buffer as an I/O stream (function)
asprintf aswprintf vasprintf vaswprintf (dynamic memory TR) | variants of sprintf etc that write to automatically-allocated buffer and return a pointer to it (function)
getline getwline getdelim getwdelim (dynamic memory TR) | read from a stream into a automatically resized buffer until delimiter/end of line (function)
Defined in header `<string.h>`
strdup (dynamic memory TR) | allocate a copy of a string (function)
strndup (dynamic memory TR) | allocate a copy of a string up to specified size (function)

This library extension also introduces assignment-allocation character `m` for use with `%s`, `%[`, and `%c` conversion specifiers in fscanf and fwscanf family of functions.

### Notes

The functions `fmemopen`, `open_memstream`, `open_wmemstream`, `getdelim`, `getline`, `strdup`, `strndup`, and the extensions to `fscanf` are available in POSIX (ISO/IEC 9945:2003).

The functions `asprintf` and `vasprintf` are available in Linux Standard Base (ISO/IEC IS 23360:2006)

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