Linux Standard Base Specification 3.0Preview1 | ||
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The strcasestr() shall behave as strstr(), except that it shall ignore the case of both strings. The strcasestr() function shall be locale aware; that is strcasestr() shall behave as if both strings had been converted to lower case in the current locale before the comparison is performed.
Upon successful completion, strcasestr() shall return a pointer to the located string or a null pointer if the string is not found. If s2 points to a string with zero length, the function shall return s1.
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