wmemset(3)

💖 wmemset(3) — Library Functions Manual 💖

okay bestie, gather round, because today we're talking about wmemset, the wide-character glow-up of everyone's fave array-filler. yes, she lives in the Library Functions Manual, section 3, and she is so much cooler than she sounds. let's get into it. 🦋

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✨ NAME ✨

wmemset — fill an array of wide-characters with a constant wide character

like. she fills. she sets. she's a memset but ✨wide✨. it's giving "same energy, bigger vibes." 💅

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📚 LIBRARY 📚

Standard C library (libc, -lc)

she's not some niche third-party thing you gotta go hunt down on github at 2am, she's right there in libc, bestie. built in. iconic. 👑

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🎀 SYNOPSIS 🎀

#include <wchar.h>

wchar_t *wmemset(size_t n;
                 wchar_t wcs[n], wchar_t wc, size_t n);

yes, n shows up in two places, that's not a typo, that's just how she rolls. don't come for her. 😭

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🌸 DESCRIPTION 🌸

okay so the tea: wmemset() is literally the wide-character equivalent of memset(3). that's it. that's her whole thing.

she fills the array of n wide-characters starting at wcs with n copies of the wide character wc.

so you hand her a spot in memory, you tell her how many wide-chars deep to go, you give her the wide-char you want stamped in there, and she just... does it. every single one. no questions asked. no cap. 🔥

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💫 RETURN VALUE 💫

wmemset() returns wcs.

that's it. she hands you back the exact pointer you gave her, like "here bestie, you dropped this, now go do something slay with it." 🫶

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🧚 ATTRIBUTES 🧚

the vibe check on this section (and for what all these terms even mean, go peek at attributes(7)):

• Interface: wmemset()
• Attribute: Thread safety
• Value: MT-Safe

translation?? she's MT-Safe, babes. multiple threads can hang out with her at the same time and nothing is gonna go sideways. we love a low-drama, unproblematic queen. no fighting, no drama, no chaos. 💜 (lowkey wish the group chat could say the same but okay.)

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⭐ STANDARDS ⭐

• C11
• POSIX.1-2008

she's certified. legit. proper. official. standards-approved behavior, periodt. 🌈

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🕰️ HISTORY 🕰️

• POSIX.1-2001
• C99

she's been around since before most of us could even hold a phone. an OG. a legend. a legacy. 🙈

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👀 SEE ALSO 👀

• memset(3)

that's her sister. the non-wide one. the original. the blueprint. go show her some love too. 💖

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and that's the whole page, bestie!! this came to you from Linux man-pages 6.20, dated 2026-02-08, and honestly? we ate. no crumbs. slay the day away and go fill some wide-character arrays. 👑💅✨🍓