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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 18:12:45 1993 by Rik Faith (faith@cs.unc.edu)
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.TH STRCASECMP 3 2017-09-15 "" "Linux Programmer's Manual"
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.SH NAME
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strcasecmp, strncasecmp \- compare two strings ignoring case
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.SH SYNOPSIS
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.nf
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.B #include <strings.h>
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.PP
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.BI "int strcasecmp(const char *" s1 ", const char *" s2 );
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.PP
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.BI "int strncasecmp(const char *" s1 ", const char *" s2 ", size_t " n );
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.fi
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.SH DESCRIPTION
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The
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.BR strcasecmp ()
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function performs a byte-by-byte comparison of the strings
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.I s1
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and
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.IR s2 ,
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ignoring the case of the characters.
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It returns an integer
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less than, equal to, or greater than zero if
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.I s1
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is found,
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respectively, to be less than, to match, or be greater than
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.IR s2 .
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.PP
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The
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.BR strncasecmp ()
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function is similar, except that it compares
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no more than
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.I n
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bytes of
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.IR s1
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and
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.IR s2 .
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.SH RETURN VALUE
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The
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.BR strcasecmp ()
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and
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.BR strncasecmp ()
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functions return
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an integer less than, equal to, or greater than zero if
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.I s1
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is, after ignoring case, found to be
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less than, to match, or be greater than
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.IR s2 ,
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respectively.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lbw27 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR strcasecmp (),
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.BR strncasecmp ()
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T} Thread safety MT-Safe locale
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.TE
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.SH CONFORMING TO
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4.4BSD, POSIX.1-2001, POSIX.1-2008.
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.SH NOTES
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The
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.BR strcasecmp ()
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and
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.BR strncasecmp ()
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functions first appeared in 4.4BSD, where they were declared in
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.IR <string.h> .
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Thus, for reasons of historical compatibility, the glibc
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.I <string.h>
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header file also declares these functions, if the
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.B _DEFAULT_SOURCE
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(or, in glibc 2.19 and earlier,
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.BR _BSD_SOURCE )
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feature test macro is defined.
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.PP
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The POSIX.1-2008 standard says of these functions:
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.PP
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.RS
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When the
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.B LC_CTYPE
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category of the locale being used is from the POSIX locale,
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these functions shall behave as if the strings had been converted
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to lowercase and then a byte comparison performed.
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Otherwise, the results are unspecified.
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.RE
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.SH SEE ALSO
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.BR bcmp (3),
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.BR memcmp (3),
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.BR strcmp (3),
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.BR strcoll (3),
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.BR string (3),
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.BR strncmp (3),
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.BR wcscasecmp (3),
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.BR wcsncasecmp (3)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
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project.
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A description of the project,
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information about reporting bugs,
|
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and the latest version of this page,
|
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can be found at
|
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\%https://www.kernel.org/doc/man\-pages/.
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