OPENSSL_strcasecmp, OPENSSL_strncasecmp - compare two strings ignoring case
int OPENSSL_strcasecmp(const char *s1, const char *s2);
int OPENSSL_strncasecmp(const char *s1, const char *s2, size_t n);
The OPENSSL_strcasecmp function performs a byte-by-byte comparison of the
strings s1 and s2, ignoring the case of the characters.
The OPENSSL_strncasecmp function is similar, except that it
compares no more than n bytes of s1 and s2.
In POSIX-compatible system and on Windows these functions use
"C" locale for case insensitive. Otherwise the comparison is done
in current locale.
Both functions return an integer less than, equal to, or greater than zero if s1
is found, respectively, to be less than, to match, or be greater than s2.
OpenSSL extensively uses case insensitive comparison of ASCII strings. Though
OpenSSL itself is locale-agnostic, the applications using OpenSSL libraries
may unpredictably suffer when they use localization (e.g. Turkish locale is
well-known with a specific I/i cases). These functions use C locale for string
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