ISPRINT(3P)

💖 ISPRINT — POSIX Programmer's Manual, bestie edition 💖

okay so we're in the POSIX Programmer's Manual today, and we're talking about isprint(3P). pull up a chair, grab a boba, let's go 🧋✨

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✨ PROLOG ✨

so this manual page is part of the POSIX Programmer's Manual, okay?

heads up bestie 🫶 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 at all. no cap.

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🎀 NAME 🎀

isprint, isprint_l — the girlies who test for a printable character 💅

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🌸 SYNOPSIS 🌸

#include <ctype.h>

int isprint(int c);
int isprint_l(int c, locale_t locale);

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🦋 DESCRIPTION 🦋

so for isprint(): 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 — literally not on purpose. this volume of POSIX.1‐2017 defers to the ISO C standard. periodt.

the isprint() and isprint_l() functions shall test whether c is a character of class print in the current locale, or in the locale represented by locale, respectively. see the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale. iykyk 📖

the c argument is an int, the value of which 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, do not do that. fr fr.

and also — the behavior is undefined if the locale argument to isprint_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle. so like, valid handle or nothing, bestie 😭

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👑 RETURN VALUE 👑

isprint() and isprint_l() shall return non-zero if c is a printable character; otherwise, they shall return 0. simple as that 💖

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💀 ERRORS 💀

No errors are defined. iconic behavior honestly, she doesn't do drama 🙈

the following sections are informative.

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⭐ EXAMPLES ⭐

None. (yeah. nothing. moving on 🎀)

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🌈 APPLICATION USAGE 🌈

to ensure applications portability — especially across natural languages, which is highkey important — only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification. no DIY classification, babe. use the ones in the family. 🫶

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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()
• ispunct()
• isspace()
• isupper()
• isxdigit()
• setlocale()
• uselocale()

also the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, <ctype.h>, <locale.h> — go read those, they're the moment ✨

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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 🫶 mwah 💋 this one's brought to you by IEEE/The Open Group, dated 2017, filed under ISPRINT(3P). slay, stay printable, drink water ✨💖