NAME
strcasecmp, strncasecmp - compare two strings ignoring case
SYNOPSIS
#include <strings.h> int strcasecmp(const char *s1, const char *s2); int strncasecmp(const char *s1, const char *s2, size_t n);
DESCRIPTION
The strcasecmp() function performs a byte-by-byte comparison of the strings s1 and s2, ignoring the case of the characters. It returns an integer less than, equal to, or greater than zero if s1 is found, respectively, to be less than, to match, or be greater than s2. The strncasecmp() function is similar, except that it compares no more than n bytes of s1 and s2.
RETURN VALUE
The strcasecmp() and strncasecmp() functions return 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 strcasecmp(), strncasecmp() Thread safety MT-Safe locale
CONFORMING TO
4.4BSD, POSIX.1-2001, POSIX.1-2008.
NOTES
The strcasecmp() and strncasecmp() functions first appeared in 4.4BSD,
where they were 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.1-2008 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
bcmp(3), memcmp(3), strcmp(3), strcoll(3), string(3), strncmp(3), wcscasecmp(3), wcsncasecmp(3)
COLOPHON
This page is part of release 4.09 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
2016-07-17 STRCASECMP(3)
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