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STRCASECMP(3) FreeBSD Library Functions Manual STRCASECMP(3)
NAME
strcasecmp, strncasecmp - compare strings, ignoring case
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h>
int
strcasecmp(const char *s1, const char *s2);
int
strncasecmp(const char *s1, const char *s2, size_t len);
#include <strings.h>
#include <xlocale.h>
int
strcasecmp_l(const char *s1, const char *s2, locale_t loc);
int
strncasecmp_l(const char *s1, const char *s2, size_t len, locale_t loc);
DESCRIPTION
The strcasecmp() and strncasecmp() functions compare the null-terminated
strings s1 and s2.
The strncasecmp() function compares at most len characters. The
strcasecmp_l() and strncasecmp_l() functions do the same as their non-
locale versions above, but take an explicit locale rather than using the
current locale.
RETURN VALUES
The functions strcasecmp() and strncasecmp() return an integer greater
than, equal to, or less than 0, depending on whether s1 is
lexicographically greater than, equal to, or less than 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 `\200' is greater than `\0'. The functions
strcasecmp_l() and strncasecmp_l() do the same but take explicit locales.
SEE ALSO
bcmp(3), memcmp(3), strcmp(3), strcoll(3), strxfrm(3), tolower(3),
wcscasecmp(3)
HISTORY
The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD.
Their prototypes existed previously in <string.h> before they were moved
to <strings.h> for IEEE Std 1003.1-2001 ("POSIX.1") compliance.
FreeBSD 14.0-RELEASE-p11 May 29, 2014 FreeBSD 14.0-RELEASE-p11