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@(#)strcasecmp.3 8.1 (Berkeley) 6/9/93
$FreeBSD: head/lib/libc/string/strcasecmp.3 266865 2014-05-30 01:09:07Z pfg $
.Dd May 29, 2014 .Dt STRCASECMP 3 .Os .Sh NAME .Nm strcasecmp , .Nm strncasecmp .Nd compare strings, ignoring case .Sh LIBRARY .Lb libc .Sh SYNOPSIS n strings.h .Ft int .Fn strcasecmp "const char *s1" "const char *s2" .Ft int .Fn strncasecmp "const char *s1" "const char *s2" "size_t len" n strings.h n xlocale.h .Ft int .Fn strcasecmp_l "const char *s1" "const char *s2" "locale_t loc" .Ft int .Fn strncasecmp_l "const char *s1" "const char *s2" "size_t len" "locale_t loc" .Sh DESCRIPTION The .Fn strcasecmp and .Fn strncasecmp functions compare the null-terminated strings .Fa s1 and .Fa s2 .
p The .Fn strncasecmp function compares at most .Fa len characters. The .Fn strcasecmp_l and .Fn strncasecmp_l functions do the same as their non-locale versions above, but take an explicit locale rather than using the current locale. .Sh RETURN VALUES The functions .Fn strcasecmp and .Fn strncasecmp return an integer greater than, equal to, or less than 0, depending on whether .Fa s1 is lexicographically greater than, equal to, or less than .Fa s2 after translation of each corresponding character to lower-case. The strings themselves are not modified. The comparison is done using unsigned characters, so that .Sq Li \e200 is greater than .Ql \e0 . The functions .Fn strcasecmp_l and .Fn strncasecmp_l do the same but take explicit locales. .Sh SEE ALSO .Xr bcmp 3 , .Xr memcmp 3 , .Xr strcmp 3 , .Xr strcoll 3 , .Xr strxfrm 3 , .Xr tolower 3 , .Xr wcscasecmp 3 .Sh HISTORY The .Fn strcasecmp and .Fn strncasecmp functions first appeared in x 4.4 . Their prototypes existed previously in n string.h before they were moved to n strings.h for .St -p1003.1-2001 compliance.