---
name: "strdupa"
section: "3"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/strdupa"
---

# strdupa(3)

string duplicate using-alloca

## NAME

strdupa - string duplicate using-alloca

## LIBRARY

Standard C library (*libc*, *-lc*)

## SYNOPSIS

```
#define _GNU_SOURCE  /* See feature_test_macros(7) */
#include <string.h>
```

**char \*strdupa(const char \****s***);**

## DESCRIPTION

**strdupa**() is similar to [**strdup**(3)](/strdup/3.md), but uses [**alloca**(3)](/alloca/3.md) to allocate the buffer.

It is equivalent to

```
strcpy(alloca(strlen(s) + 1), s)
```

## RETURN VALUE

On success, this macro returns a pointer to the duplicated string.

## ATTRIBUTES

For an explanation of the terms used in this section, see [**attributes**(7)](/attributes/7.md).

| | | |
| --- | --- | --- |
| **Interface** | **Attribute** | **Value** |
| **strdupa**() | Thread safety | MT-Safe |

## STANDARDS

GNU.

## HISTORY

GNU.

## CAVEATS

See [**alloca**(3)](/alloca/3.md).

## SEE ALSO

[**string**(3)](/string/3.md), [**alloca**(3)](/alloca/3.md), [**strdup**(3)](/strdup/3.md)