ISPUNCT(3P)

💅 ISPUNCT(3P) — the POSIX Programmer's Manual glow-up

okay so bestie, welcome to the ispunct page from the POSIX Programmer's Manual (that's the manual name, it's iconic, we're keeping it). Let's get into it ✨

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🌸 PROLOG

Real talk first, bestie: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ — so if you're on Linux, go check the corresponding Linux manual page for the tea on Linux behavior. Or, plot twist, the interface might not even be implemented on Linux at all. 🙈

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✨ NAME

ispunct, ispunct_l — test for a punctuation character 👑

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🎀 SYNOPSIS

#include <ctype.h>

int ispunct(int c);
int ispunct_l(int c, locale_t locale);

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💖 DESCRIPTION

So for ispunct(): the functionality described on this reference page is aligned with the ISO C standard. And if there's any conflict between what's written here and the ISO C standard — that's unintentional, not a read. This volume of POSIX.1‐2017 defers to the ISO C standard, periodt.

The ispunct() and ispunct_l() functions shall test whether c is a character of class punct in the current locale, or in the locale represented by locale, respectively. If you wanna go deeper, see the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale. 📚

The c argument is an int, and the value of it — the application shall ensure — is a character representable as an unsigned char, or equal to the value of the macro EOF. If the argument has any other value?? 🚨 the behavior is undefined. Like, don't.

Also, and this is important bestie: the behavior is undefined if the locale argument to ispunct_l() is the special locale object LC_GLOBAL_LOCALE, or if it's not a valid locale object handle. Not valid = not it. 💀

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🦋 RETURN VALUE

ispunct() and ispunct_l() shall return non-zero if c is a punctuation character. Otherwise? They shall return 0. Simple as that, slay. 💅

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🌈 ERRORS

No errors are defined. ✨

The following sections are informative. (iykyk — that means they're the bonus content, not the rules.)

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🍓 EXAMPLES

None. 😭 (yes, really, that's the whole section)

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🧚 APPLICATION USAGE

To ensure applications portability — especially across natural languages, which is lowkey the whole point — only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification. Don't freestyle it, bestie. 🫶

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💜 RATIONALE

None.

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⭐ FUTURE DIRECTIONS

None.

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👑 SEE ALSO

• isalnum()
• isalpha()
• isblank()
• iscntrl()
• isdigit()
• isgraph()
• islower()
• isprint()
• isspace()
• isupper()
• isxdigit()
• setlocale()
• uselocale()

Also the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, plus <ctype.h> and <locale.h>. Go read them, they're giving main character energy. 📖

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💖 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. (Read: the original wins, always, no cap.)

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 . 🐛

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and that's the whole page, bestie!! this lil masterpiece was brought to you by IEEE/The Open Group, dated 2017 — thanks for coming to my TED talk, mwah 💋✨🦋