isascii(3)

isascii3

Test for ascii character

Usage

#include <ctype.h>

int

isascii(int c);

Library

Standard C Library (libc, -lc)

Overview

The isascii() function tests for an ASCII character, which is any character between 0 and octal 0177 inclusive.

Releases

87 releases since FreeBSD 2.0.5-RELEASE; the text changed 43 times.

  1. 2.0.5–2.2.2
  2. 2.2.5–3.4
  3. 3.5–3.5.1
  4. 4.0
  5. 4.1
  6. 4.1.1–4.2
  7. 4.3
  8. 4.4
  9. 4.5–4.11
  10. 5.0–6.3
  11. 6.4
  12. 7.0
  13. 7.1
  14. 7.2
  15. 7.3
  16. 7.4
  17. 8.0
  18. 8.1
  19. 8.2
  20. 8.3
  21. 8.4
  22. 9.0
  23. 9.1
  24. 9.2
  25. 9.3
  26. 10.0
  27. 10.1
  28. 10.2
  29. 10.3
  30. 10.4
  31. 11.0
  32. 11.1
  33. 11.2
  34. 11.3
  35. 11.4
  36. 12.0
  37. 12.1
  38. 12.2
  39. 12.3
  40. 12.4
  41. 13.0–13.1
  42. 13.2
  43. 13.3–14.5
  44. 15.0–16.0

History

The isascii() function first appeared in Version 7 AT&T UNIX.

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