---
name: "SDL_strlcat"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_strlcat"
---

# SDL\_strlcat(3)

Concatenate strings.

## NAME

SDL\_strlcat - Concatenate strings.

## HEADER FILE

Defined in SDL3/SDL\_stdinc.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**size\_t SDL\_strlcat(char \*dst, const char \*src, size\_t maxlen);**

## DESCRIPTION

This function appends up to **maxlen**

•  **SDL\_strlen** (dst) - 1 characters from **src** to the end of the string in **dst** , then appends a null terminator. **src** and **dst** must not overlap.

If **maxlen**

•  **SDL\_strlen** (dst) - 1 is less than or equal to 0, then **dst** is unmodified.

## FUNCTION PARAMETERS

- *dst*

  The destination buffer already containing the first null-terminated string. Must not be NULL and must not overlap with **src** .

- *src*

  The second null-terminated string. Must not be NULL, and must not overlap with **dst** .

- *maxlen*

  The length (in characters) of the destination buffer.

## RETURN VALUE

Returns the length (in characters, excluding the null terminator) of the string in **dst** plus the length of **src** .

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_strlcpy**(3)](/SDL_strlcpy/3.md)