STRCASECMP(3)		   Linux Programmer's Manual		 STRCASECMP(3)



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 histori-
       cal 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  per-
	      formed.  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 4.10 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)