---
name: "al_ustr_replace_range"
section: "3"
platform: "linux"
package: "allegro"
version: "5.2.11.3-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/al_ustr_replace_range"
---

# al\_ustr\_replace\_range(3)

Allegro 5 API

## NAME

al\_ustr\_replace\_range - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro.h>
  bool al_ustr_replace_range(ALLEGRO_USTR *us1, int start_pos1, int end_pos1,
     const ALLEGRO_USTR *us2)
  ```

## DESCRIPTION

Replace the part of `us1` in the byte interval \[`start_pos1`, `end_pos1`) with the contents of `us2`. `start_pos1` cannot be less than 0. If `start_pos1` is past the end of `us1` then the space between the end of the string and `start_pos1` will be padded with NUL (`'\0'`) bytes.

Use [al\_ustr\_offset(3)](/al_ustr_offset/3.md) to find the byte offsets.

Returns true on success, false on error.

## SEE ALSO

[al\_ustr\_set\_chr(3)](/al_ustr_set_chr/3.md)