TOLOWER(3POSIX)

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

💖 TOLOWER(3POSIX) 💖

ok so bestie, welcome to the POSIX Programmer's Manual ✨ this page lives in the POSIX Programmer's Manual, and heads up: the Linux implementation of this interface may differ (so pls consult the corresponding Linux manual page for details of Linux behavior), or the interface may legitimately not be implemented on Linux at all. no cap. 🙈

🌸 PROLOG 🌸

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.

✨ NAME ✨

tolower, tolower_l — transliterate uppercase characters to lowercase

like... it takes your loud uppercase letters and makes them chill lowercase ones 🫶

🎀 SYNOPSIS 🎀

#include <ctype.h>

int tolower(int c);
int tolower_l(int c, locale_t locale);

💅 DESCRIPTION 💅

For tolower(): 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 — not me starting drama with ISO C — this volume of POSIX.1-2017 defers to the ISO C standard. periodt. 👑

The tolower() and tolower_l() functions have as a domain a type int, the value of which is representable as an unsigned char or the value of EOF. If the argument has any other value, the behavior is undefined 💀 — so like, don't do that, fr fr.

If the argument of tolower() or tolower_l() represents an uppercase letter, and there exists a corresponding lowercase letter as defined by character type information in the current locale or in the locale represented by locale, respectively (category LC_CTYPE), the result shall be the corresponding lowercase letter. All other arguments in the domain are returned unchanged. iconic behavior honestly 🌈

🚨 ok serious one: the behavior is undefined if the locale argument to tolower_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle. so don't pass it garbage, bestie, i'm begging 😭

⭐ RETURN VALUE ⭐

Upon successful completion, the tolower() and tolower_l() functions shall return the lowercase letter corresponding to the argument passed; otherwise, they shall return the argument unchanged.

translation: you get the lowercase glow-up, or you get your original self back untouched 💖

🌸 ERRORS 🌸

No errors are defined.

The following sections are informative. (so like, the vibe-only sections, iykyk ✨)

🦋 EXAMPLES 🦋

None.

🎀 APPLICATION USAGE 🎀

None.

💜 RATIONALE 💜

None.

🧚 FUTURE DIRECTIONS 🧚

None.

🔥 SEE ALSO 🔥

  • setlocale()
  • uselocale()
  • The Base Definitions volume of POSIX.1-2017, Chapter 7, Locale, <ctype.h>, <locale.h>

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 lil masterpiece is brought to you by IEEE/The Open Group, dated 2017, and it's the one and only TOLOWER(3POSIX) 🎀 go forth and lowercase responsibly 🦋💅

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