NAME
strcasecmp,
strcasecmp_l, strncasecmp,
strncasecmp_l —
compare strings, ignoring
case
SYNOPSIS
#include
<strings.h>
int
strcasecmp(const char *s1,
const char *s2);
int
strcasecmp_l(const char *s1,
const char *s2, locale_t
locale);
int
strncasecmp(const char *s1,
const char *s2, size_t len);
int
strncasecmp_l(const char *s1,
const char *s2, size_t len,
locale_t locale);
DESCRIPTION
These functions compare the NUL-terminated strings
s1 and s2 and return an integer
greater than, equal to, or less than 0, according to 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’.
strncasecmp()
and
strncasecmp_l()
compare at most len characters.
On OpenBSD, these functions always use the C locale and ignore the global locale, the thread-specific locale, and the locale argument.
ENVIRONMENT
On other operating systems, the behaviour of
strcasecmp() and
strncasecmp() may depend on the
LC_CTYPE
locale(1).
SEE ALSO
STANDARDS
These functions conform to IEEE Std 1003.1-2008 (“POSIX.1”).
HISTORY
The strcasecmp() and
strncasecmp() functions have been available since
4.3BSD-Tahoe, and
strcasecmp_l() and
strncasecmp_l() since OpenBSD
6.2.