TOWLOWER(3P)

👑 TOWLOWER(3P) — the POSIX Programmer's Manual girlie 💅

okay bestie, welcome to the POSIX Programmer's Manual, and this page is all about towlower and towlower_l — the wide-character glow-down functions ✨

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🌸 PROLOG 🌸

okay so real talk first: 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 deets on Linux behavior. Or, plot twist, the interface might not even be implemented on Linux at all. 😭 Not me finding out the hard way. Anyway.

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✨ NAME ✨

towlower, towlower_l — transliterate uppercase wide-character code to lowercase 🦋

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💖 SYNOPSIS 💖

#include <wctype.h>

wint_t towlower(wint_t wc);
wint_t towlower_l(wint_t wc, locale_t locale);

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💅 DESCRIPTION 💅

So for towlower() specifically: the functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1‐2017 defers to the ISO C standard. Periodt. 👑

The towlower() and towlower_l() functions have as a domain a type wint_t, the value of which the application shall ensure is a character representable as a wchar_t, and a wide-character code corresponding to a valid character in the locale used by the function, or the value of WEOF. If the argument has any other value, the behavior is undefined. 🙈 So like, don't do that.

If the argument of towlower() or towlower_l() represents an uppercase wide-character code, and there exists a corresponding lowercase wide-character code as defined by character type information in the current locale, or in the locale represented by locale, respectively (category LC_CTYPE), then the result shall be the corresponding lowercase wide-character code. All other arguments in the domain are returned unchanged. That's it, that's the whole vibe check. 🎀

⚠️ also bestie, the behavior is undefined if the locale argument to towlower_l() is the special locale object LC_GLOBAL_LOCALE, or is not a valid locale object handle. Like. Please. Don't. 💀

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🌈 RETURN VALUE 🌈

Upon successful completion, the towlower() and towlower_l() functions shall return the lowercase letter corresponding to the argument passed; otherwise, they shall return the argument unchanged. Lowkey the most chill return policy ever. 🫶

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🍓 ERRORS 🍓

No errors are defined. Not a single one. Iconic behavior honestly. ✨

The following sections are informative.

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🧚 EXAMPLES 🧚

None. (I know. I was gagged too. 😭)

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💜 APPLICATION USAGE 💜

None.

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🌸 RATIONALE 🌸

None.

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⭐ FUTURE DIRECTIONS ⭐

None.

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🦋 SEE ALSO 🦋

• setlocale()
• uselocale()

The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, <locale.h>, <wctype.h>

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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. 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, no cap 🫶 this little beauty was brought to you by IEEE/The Open Group, 2017 — mwah, slay, go lowercase something 💅✨💖