ISASCII(3POSIX)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
isascii — test for a 7-bit US-ASCII character

SYNOPSIS

#include <ctype.h>

int isascii(int c);

DESCRIPTION
The isascii() function shall test whether c is a 7-bit US-ASCII character code.

The isascii() function is defined on all integer values.

RETURN VALUE
The isascii() function shall return non-zero if c is a 7-bit US-ASCII character code between 0 and octal 0177 inclusive; otherwise, it shall return 0.

ERRORS
No errors are defined.

The following sections are informative.

EXAMPLES
None.

APPLICATION USAGE
The isascii() function cannot be used portably in a localized application.

RATIONALE
None.

FUTURE DIRECTIONS
The isascii() function may be removed in a future version.

SEE ALSO
The Base Definitions volume of POSIX.1-2017, <ctype.h>

COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .