ISPRINT(3POSIX)

💖 ISPRINT(3POSIX) 💖

okay bestie, welcome to the POSIX Programmer's Manual 🫶 this one's about isprint and isprint_l, and yes it's short, but the details are everything so stay with me.

---

🌸 PROLOG 🌸

Real talk before we start: this page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ — so consult the corresponding Linux manual page for the details of Linux behavior. Also possible: the interface may not be implemented on Linux at all. 🙈 iykyk.

---

✨ NAME ✨

isprint, isprint_l — test for a printable character 💅

---

🎀 SYNOPSIS 🎀

#include <ctype.h>

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

that's it. two little functions. iconic.

---

🦋 DESCRIPTION 🦋

So for isprint(): the functionality described on this reference page is aligned with the ISO C standard. And like, if there's any conflict between the requirements described here and the ISO C standard, that's unintentional — this volume of POSIX.1‐2017 defers to the ISO C standard. no drama, the ISO C standard is the main character here. 👑

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 🗺️)

The c argument is an int, and the value of it is something 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. 💀 so like, don't.

🚨 also undefined behavior: if the locale argument to isprint_l() is the special locale object LC_GLOBAL_LOCALE, or is not a valid locale object handle. not a vibe, don't do it.

---

⭐ RETURN VALUE ⭐

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

---

🌈 ERRORS 🌈

No errors are defined. ✨

The following sections are informative. (translation: the gossip below is bonus content, not requirements 💖)

---

🍓 EXAMPLES 🍓

None. 😭 we got nothing. no examples. empty. a void. moving on bestie.

---

💜 APPLICATION USAGE 💜

To ensure applications portability — especially across natural languages 🌍 — 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 rule. periodt.

---

🧚 RATIONALE 🧚

None. 🙈

---

👑 FUTURE DIRECTIONS 👑

None. 💅

---

🔥 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, plus the headers <ctype.h> and <locale.h> 🎀

---

💖 COPYRIGHT 💖

okay legal bestie moment, read carefully:

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 gem came to you from IEEE/The Open Group, 2017 — the ISPRINT(3POSIX) page itself. go forth and classify characters responsibly. slay. 💅✨