toascii(3)

toascii3

Convert character to ascii

Usage

#include <ctype.h>

[[deprecated]] int toascii(int c);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

toascii():

    _XOPEN_SOURCE
        || /* glibc >= 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

Library

Standard C library (libc, -lc)

Overview

toascii() converts c to a 7-bit unsigned char value that fits into the ASCII character set, by clearing the high-order bits.

Return value

The value returned is that of the converted character.

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
toascii()Thread safetyMT-Safe

Releases

19 releases since Debian 1.1 (Buzz); the text changed 13 times.

  1. 1.1–2.2
  2. 3.0
  3. 3.1
  4. 4.0
  5. 5.0
  6. 6.0
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. Arch

Standards

POSIX.1-2008.

History

SVr4, BSD, POSIX.1-2001. Obsolete in POSIX.1-2008, noting that it cannot be used portably in a localized application.

Bugs

Many people will be unhappy if you use this function. This function will convert accented letters into random characters.

From man-pages 6.19-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.