1ISASCII(3P)                POSIX Programmer's Manual               ISASCII(3P)
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PROLOG

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

12       isascii — test for a 7-bit US-ASCII character
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SYNOPSIS

15       #include <ctype.h>
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17       int isascii(int c);
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DESCRIPTION

20       The isascii() function shall test whether c is a 7-bit US-ASCII charac‐
21       ter code.
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23       The isascii() function is defined on all integer values.
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RETURN VALUE

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

31       No errors are defined.
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33       The following sections are informative.
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EXAMPLES

36       None.
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APPLICATION USAGE

39       The  isascii() function cannot be used portably in a localized applica‐
40       tion.
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RATIONALE

43       None.
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FUTURE DIRECTIONS

46       The isascii() function may be removed in a future version.
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SEE ALSO

49       The Base Definitions volume of POSIX.1‐2017, <ctype.h>
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52       Portions of this text are reprinted and reproduced in  electronic  form
53       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
54       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
55       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
56       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
57       event of any discrepancy between this version and the original IEEE and
58       The Open Group Standard, the original IEEE and The Open Group  Standard
59       is  the  referee document. The original Standard can be obtained online
60       at http://www.opengroup.org/unix/online.html .
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62       Any typographical or formatting errors that appear  in  this  page  are
63       most likely to have been introduced during the conversion of the source
64       files to man page format. To report such errors,  see  https://www.ker‐
65       nel.org/doc/man-pages/reporting_bugs.html .
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69IEEE/The Open Group                  2017                          ISASCII(3P)
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