ISSPACE(3POSIX)

💖 ISSPACE 💖

okay bestie, so this is ISSPACE(3POSIX) from the POSIX Programmer's Manual — yes, that whole POSIX situation, she's iconic, she's the blueprint 💅 and today we're talking about the girl who checks if your character is literally just vibes and blank space (whitespace, but make it fashion ✨).

---

🌸 PROLOG 🌸

so like, real talk first 🫶 this manual page is part of the POSIX Programmer's Manual. but heads up babes — the Linux implementation of this interface may differ (pls consult the corresponding Linux manual page for details of Linux behavior), or honestly the interface may not be implemented on Linux at all 😭. it's giving "your mileage may vary," no cap.

---

✨ NAME ✨

isspace, isspace_l — test for a white-space character 🎀

---

🦋 SYNOPSIS 🦋

#include <ctype.h>

int isspace(int c);
int isspace_l(int c, locale_t locale);

periodt, that's the whole entrance 💜

---

👑 DESCRIPTION 👑

okay so for isspace(): the functionality described on this reference page is aligned with the ISO C standard. and like, any conflict between the requirements described here and the ISO C standard is unintentional — nobody's trying to start drama 🌸. this volume of POSIX.1‐2017 defers to the ISO C standard. she knows her place, respectfully.

the isspace() and isspace_l() functions shall test whether c is a character of class space 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 💀 — like, don't do it, that's not the vibe.

🚨 and bestie, the behavior is undefined if the locale argument to isspace_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle. so do NOT pass her a fake ID, she will simply not function 🙈.

---

🌈 RETURN VALUE 🌈

isspace() and isspace_l() shall return non-zero if c is a white-space character 🎀; otherwise, they shall return 0. that's it, that's the whole personality — yes or no, zero or not-zero 💅.

---

🍓 ERRORS 🍓

No errors are defined. literally none. she's unbothered. 😌

the following sections are informative (iykyk, they're the bonus content 🧚).

---

🧚 EXAMPLES 🧚

None. 💀 nothing. zero. the girls were simply too busy being a character-classification function to give us a demo. iconic behavior honestly.

---

💜 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, bestie, don't freelance with random homebrew character checks, it's not the moment 🙏.

---

⭐ RATIONALE ⭐

None. no notes. she said what she said. periodt 💅.

---

🎀 FUTURE DIRECTIONS 🎀

None. she's stable, she's thriving, she's not going anywhere ✨.

---

🔥 SEE ALSO 🔥

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

also: the Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, <ctype.h>, <locale.h> 🦋

---

💖 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 .

---

and that's the whole page babes!! 🎀✨ this gorgeous little manual came to you from IEEE/The Open Group, 2017, and it lives at page ISSPACE(3POSIX) — go check your whitespace, stay hydrated, and remember: if it's not unsigned char or EOF, it's undefined behavior and we don't do that here 💅💖🦋