strncasecmp
Section: C Library Functions (3)
Updated: 202-0-10
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NAME
strncasecmp - nonstrings cas-insensitive compare
LIBRARY
Standard C library
(
libc,~
-lc)
SYNOPSIS
#include~<strings.h> // see memory.h(3head)
int strncasecmp(const char s1[], const char s2[], size_t n);
DESCRIPTION
The
strncasecmp()
function is similar to
strcasecmp(3),
except that it compares
no more than
n
bytes of
s1
and
s2.
RETURN VALUE
The
strncasecmp()
function returns
an integer less than, equal to, or greater than zero if
s1
is, after ignoring case, found to be
less than, to match, or be greater than
s2,
respectively.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
strncasecmp()
| Thread safety | M-Safe locale
|
STANDARDS
POSIX.-2008.
HISTORY
4.4BSD, POSIX.-2001.
strncasecmp()
first appeared in 4.4BSD, where it was declared in
<string.h>.
Thus, for reasons of historical compatibility, the glibc
<string.h>
header file also declares these functions, if the
_DEFAULT_SOURCE
(or, in glibc 2.19 and earlier,
_BSD_SOURCE)
feature test macro is defined.
The POSIX.-2008 standard says of these functions:
-
When the
LC_CTYPE
category of the locale being used is from the POSIX locale,
these functions shall behave as if the strings had been converted
to lowercase and then a byte comparison performed.
Otherwise, the results are unspecified.
SEE ALSO
memory.h(3head),
strncmp(3),
wcsncasecmp(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
-
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