bitmap_parse(9)

✨ bitmap_parse(9) — Kernel API Manual ✨

okay bestie, gather round 💖 this is bitmap_parse(9) and it's literally the glow-up that turns an ASCII hex string into a bitmap. no cap.

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🎀 NAME 🎀

bitmap_parse — convert an ASCII hex string into a bitmap.

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🛠️ SYNOPSIS 🛠️

int bitmap_parse (const char *start , unsigned int buflen , unsigned
       long *maskp , int nmaskbits );

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🧚 ARGUMENTS 🧚

• start — pointer to buffer containing string. 🌸
• buflen — buffer size in bytes. If string is smaller than this then it must be terminated with a or 0 In that case, UINT_MAX may be provided instead of string length. 🫶
• maskp — pointer to bitmap array that will contain result. 💅
• nmaskbits — size of bitmap, in bits. 🔥

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💅 DESCRIPTION 💅

Commas group hex digits into chunks. Each chunk defines exactly 32 bits of the resultant bitmask. No chunk may specify a value larger than 32 bits (-EOVERFLOW), and if a chunk specifies a smaller value then leading 0-bits are prepended. -EINVAL is returned for illegal characters. Grouping such as "1,,5", ",44", "," or "" is allowed. Leading, embedded and trailing whitespace accepted.

slay, but also: those error codes are doing important main-character work, so don't ignore them 😭

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🔗 SEE ALSO 🔗

• Kernel file ./lib/bitmap-str.c
• bitmap_parse_user(9)
• bitmap_print_to_buf(9)
• bitmap_print_bitmask_to_buf(9)
• bitmap_print_list_to_buf(9)
• bitmap_parselist(9)
• bitmap_parselist_user(9)

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🌈 that's the whole vibe: hex string in, bitmap out, commas doing their little grouping thing, and error codes catching the chaos. periodt. 💜

🎀 xoxo, your kernel bestie — source/version ./lib, dated October 2026 💅