ISWSPACE(3POSIX)

💖 ISWSPACE(3POSIX) — the POSIX Programmer's Manual, bestie edition 💖

okay so this is a page from the POSIX Programmer's Manual (yes, the real one, the whole POSIX gang) and we're gonna talk about iswspace and iswspace_l. pull up a chair. 🫶

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✨ PROLOG ✨

real talk before we even start: 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 consult the corresponding Linux manual page for the deets on Linux behavior. also possible: the interface just… isn't implemented on Linux at all. 🙈 so check first, bestie, don't just assume.

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🌸 NAME 🌸

iswspace, iswspace_l — test for a white-space wide-character code

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🎀 SYNOPSIS 🎀

#include <wctype.h>

int iswspace(wint_t wc);
int iswspace_l(wint_t wc, locale_t locale);

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💅 DESCRIPTION 💅

okay so for iswspace(): the functionality described on this reference page is aligned with the ISO C standard. if there's any conflict between what's written here and the ISO C standard, that conflict is unintentional — nobody did that on purpose. this volume of POSIX.1‐2017 defers to the ISO C standard. periodt.

so here's the vibe: the iswspace() and iswspace_l() functions shall test whether wc is a wide-character code representing a character of class space — in the current locale for iswspace(), or in the locale represented by locale for iswspace_l(). respectively. see the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale for the whole lore. 📖

the wc argument is a wint_t, and the value of it — the application shall ensure — is a wide-character code corresponding to a valid character in the locale used by the function, or equal to the value of the macro WEOF. that's the deal.

🚨 and if the argument has any other value?? the behavior is undefined. like, we don't know what happens. we can't help you. it's giving chaos. 💀

and another one: the behavior is undefined if the locale argument to iswspace_l() is the special locale object LC_GLOBAL_LOCALE, or if it's not a valid locale object handle. do not pass those. i'm begging. 😭

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👑 RETURN VALUE 👑

the iswspace() and iswspace_l() functions shall return non-zero if wc is a white-space wide-character code. otherwise? they shall return 0. simple as that, no cap. ✨

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💀 ERRORS 💀

no errors are defined. literally none. not a single one. iconic behavior honestly. 💅

the following sections are informative.

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🦋 EXAMPLES 🦋

None. (bestie we got nothing. it's a vibe. 🌈)

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🌟 APPLICATION USAGE 🌟

so, for the sake of application portability — especially across natural languages, which is a whole thing — only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification. that's the assignment. don't go rogue. 🎀

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🧚 RATIONALE 🧚

None.

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🌈 FUTURE DIRECTIONS 🌈

None.

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🍓 SEE ALSO 🍓

• iswalnum()
• iswalpha()
• iswcntrl()
• iswctype()
• iswdigit()
• iswgraph()
• iswlower()
• iswprint()
• iswpunct()
• iswupper()
• iswxdigit()
• setlocale()
• uselocale()

also, the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, plus the headers <locale.h> and <wctype.h>. 💜

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⭐ COPYRIGHT ⭐

okay legal moment, stay with me, this part matters:

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 is the one with main character energy here, not us. 🤝)

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 one was brought to you by IEEE/The Open Group, 2017 — the ISWSPACE(3POSIX) girlies. go test your wide characters responsibly. mwah. 💖✨