ISASCII(3POSIX)

📦 version 2017a, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu resolute, ubuntu stonking

🦋 ISASCII(3POSIX) — the vibe check for 7-bit US-ASCII 🦋

okay bestie so this one is from the POSIX Programmer's Manual, and it's the manual page for isascii(3POSIX). come sit with me, it's short and it's cute 💖

🌸 PROLOG 🌸

okay so first things first, a lil heads up that the manpage itself gives you:

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.

so like. it might be different on your Linux box, or honestly it might not even be there at all 😭 check the Linux page, that's the move. iykyk.

✨ NAME ✨

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

💅 SYNOPSIS 💅

#include <ctype.h>

int isascii(int c);

🎀 DESCRIPTION 🎀

okay so what does she actually do? the isascii() function shall test whether c is a 7-bit US-ASCII character code. that's it. that's the whole job. queen of knowing her lane 👑

and the glow-up detail here: the isascii() function is defined on all integer values. every single one. no weird gaps, no undefined corners. she's got you, fr fr.

🌈 RETURN VALUE 🌈

  • isascii() 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. literally none. she simply does not have beef with anyone.

the following sections are informative, btw — so like, read them for the lore, not for the law ✨

🍓 EXAMPLES 🍓

None. nothing. the cupboard is bare bestie 😭

🫶 APPLICATION USAGE 🫶

important one, pay attention:

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

so like, if your app is doing the localization thing, this is not the function to build your whole personality on. noted. periodt.

🧚 RATIONALE 🧚

None. she didn't feel like explaining herself 💅

🔥 FUTURE DIRECTIONS 🔥

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

not me telling you this could get deleted. if you're out here relying on her, maybe have a backup plan 🫠

👑 SEE ALSO 👑

  • The Base Definitions volume of POSIX.1‐2017, <ctype.h>

okay the legal bit, and we're keeping every word because that's how it works:

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 .

and that's the whole page bestie 🎀 this one came to you courtesy of IEEE/The Open Group, dated 2017, filed under ISASCII(3POSIX) — and yes, the original header and footer said exactly that, i just moved the receipts down here so the top could be cute. slay, go check if your character is 7-bit, ily, bye 💖✨

📦 where this page comes from