towlower(3)

towlower3

Upper case to lower case letter conversion (wide character version)

Usage

#include <wctype.h>

wint_t

towlower(wint_t wc);

Library

Standard C Library (libc, -lc)

Overview

The towlower() function converts an upper-case letter to the corresponding lower-case letter.

Return values

If the argument is an upper-case letter, the towlower() function returns the corresponding lower-case letter if there is one; otherwise the argument is returned unchanged.

Releases

56 releases since FreeBSD 5.0-RELEASE; the text changed 33 times.

  1. 5.0–6.3
  2. 6.4
  3. 7.0
  4. 7.1
  5. 7.2
  6. 7.3
  7. 7.4
  8. 8.0
  9. 8.1
  10. 8.2
  11. 8.3
  12. 8.4
  13. 9.0
  14. 9.1
  15. 9.2
  16. 9.3
  17. 10.0
  18. 10.1
  19. 10.2
  20. 10.3
  21. 10.4
  22. 11.0
  23. 11.1
  24. 11.2
  25. 11.3
  26. 11.4
  27. 12.0
  28. 12.1
  29. 12.2
  30. 12.3
  31. 12.4
  32. 13.0–13.2
  33. 13.3–14.5
  34. 15.0–16.0

Standards

The towlower() function conforms to ISO/IEC 9899:1999 (“ISO C99”).

From base 16.0-CURRENT-20261027-61c70dc16a79 in FreeBSD 16.0-CURRENT (2026-10-27). Parsed by carta from the page's mdoc source.