ISGRAPH(3POSIX)

💖 ISGRAPH(3POSIX) — the POSIX Programmer's Manual glow-up 💖

okay bestie, so this is ISGRAPH(3POSIX), straight out of the POSIX Programmer's Manual. Pull up a chair, we're classifying characters and we're gonna be so normal about it. 🦋

🌸 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 go consult the corresponding Linux manual page for details on Linux behavior — or honestly, the interface may not even be implemented on Linux at all. 🙈

---

✨ NAME ✨

isgraph, isgraph_l — test for a visible character. that's it, that's the whole job. iconic. 💅

---

🎀 SYNOPSIS 🎀

#include <ctype.h>

int isgraph(int c);
int isgraph_l(int c, locale_t locale);

look at those signatures, they're literally so clean 🫶

---

👑 DESCRIPTION 👑

For isgraph(): 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 — nobody's trying to start drama with ISO C. This volume of POSIX.1‐2017 defers to the ISO C standard, periodt.

The isgraph() and isgraph_l() functions shall test whether c is a character of class graph 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, 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. not "a little weird", not "vibes off" — undefined. do not pass go. 😭

And for isgraph_l(): the behavior is undefined if the locale argument is the special locale object LC_GLOBAL_LOCALE, or if it's not a valid locale object handle. fr fr, don't do that. 💀

---

⭐ RETURN VALUE ⭐

The isgraph() and isgraph_l() functions shall return non-zero if c is a character with a visible representation; otherwise, they shall return 0.

so basically: visible? slay. not visible? zero. simple as. 🎀

---

💜 ERRORS 💜

No errors are defined.

The following sections are informative. (translation: the vibes below are supplementary, not law 📜)

---

🍓 EXAMPLES 🍓

None.

truly nothing. we're serving minimalism. ✨

---

🌈 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. no rogue character-classifying, bestie, we're keeping it portable. 🧚

---

💅 RATIONALE 💅

None.

---

🦋 FUTURE DIRECTIONS 🦋

None.

---

🔥 SEE ALSO 🔥

• isalnum()
• isalpha()
• isblank()
• iscntrl()
• isdigit()
• islower()
• isprint()
• ispunct()
• isspace()
• isupper()
• isxdigit()
• setlocale()
• uselocale()

The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, <ctype.h>, <locale.h> — the whole squad, go read them, iykyk 💖

---

📜 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 is the main character here, we're just the narrator 👑)

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!! brought to you by IEEE/The Open Group, dated 2017 — yes, 2017, the year of the page, we love a vintage moment. 💖✨🎀 go check if your character is visible, and stay hydrated. 🫶