OPENSSL_STRCASECMP(3ossl)

💖 OPENSSL_STRCASECMP 💖

okay bestie, welcome to the 3ossl manual page for OPENSSL_strcasecmp and OPENSSL_strncasecmp — the two little functions that let you compare strings while ✨completely ignoring case✨. no cap.

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🌸 NAME 🌸

OPENSSL_strcasecmp, OPENSSL_strncasecmp — compare two strings ignoring case 💅

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✨ SYNOPSIS ✨

#include <openssl/crypto.h>

int OPENSSL_strcasecmp(const char *s1, const char *s2);
int OPENSSL_strncasecmp(const char *s1, const char *s2, size_t n);

like. that's it. that's the whole vibe check. 🦋

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🎀 DESCRIPTION 🎀

So OPENSSL_strcasecmp does a byte-by-byte comparison of the strings s1 and s2, and it literally just ignores the case of the characters. 'A' vs 'a'? not the drama. we move on. 👑

OPENSSL_strncasecmp is the same energy, except it compares no more than n bytes of s1 and s2. so it's giving "short king" — it knows when to stop. 🙈

On a POSIX-compatible system and on Windows, these functions use the "C" locale for case insensitivity. Otherwise the comparison is done in the current locale. iykyk. 🌈

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💖 RETURN VALUES 💖

Both functions hand you back an integer, and the tea is:

• less than zero if s1 is found to be less than s2
• equal to zero if s1 matches s2
• greater than zero if s1 is found to be greater than s2

fr fr, that's the whole scale. 📏✨

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🧚 NOTES 🧚

OpenSSL extensively uses case insensitive comparison of ASCII strings. icon behavior honestly.

But here's the thing, bestie — even though OpenSSL itself is locale-agnostic, applications using OpenSSL libraries may unpredictably suffer when they use localization. the classic example: the Turkish locale is well-known for its very specific I/i cases. 💀

so yeah, these functions use the C locale for string comparison. that's the safe lane. stay in it. 🫶

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🦋 HISTORY 🦋

These functions were added in OpenSSL 3.0.3. babygirls are relatively new but they've been carrying their weight. 🎀

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👑 COPYRIGHT 👑

Copyright 2022-2024 The OpenSSL Project Authors. All Rights Reserved. 🌟

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.

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okay that's the whole page, bestie!! 💖✨🎀🦋🌸💅🫶

and for the lil sign-off: this was version 3.5.9, dated 2026-09-29, and yes it's still OPENSSL_STRCASECMP(3ossl) — periodt. 👑🌈⭐