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[thirdparty/man-pages.git] / man3 / strcmp.3

.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 18:08:52 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified 2001-08-31, aeb
.\"
.TH STRCMP 3  2019-03-06 "" "Linux Programmer's Manual"
.SH NAME
strcmp, strncmp \- compare two strings
.SH SYNOPSIS
.nf
.B #include <string.h>
.PP
.BI "int strcmp(const char *" s1 ", const char *" s2 );
.PP
.BI "int strncmp(const char *" s1 ", const char *" s2 ", size_t " n );
.fi
.SH DESCRIPTION
The
.BR strcmp ()
function compares the two strings
.I s1
and
.IR s2 .
The locale is not taken into account (for a locale-aware comparison, see
.BR strcoll (3)).
It returns an integer less than, equal to, or greater
than zero if
.I s1
is found, respectively, to be less than,
to match, or be greater than
.IR s2 .
.PP
The
.BR strncmp ()
function is similar, except it compares
only the first (at most)
.IR n
bytes of
.I s1
and
.IR s2 .
.SH RETURN VALUE
The
.BR strcmp ()
and
.BR strncmp ()
functions return an integer
less than, equal to, or greater than zero if
.I s1
(or the first
.I n
bytes thereof) is found, respectively, to be less than, to
match, or be greater than
.IR s2 .
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw19 lb lb
l l l.
Interface	Attribute	Value
T{
.BR strcmp (),
.BR strncmp ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
.SH SEE ALSO
.BR bcmp (3),
.BR memcmp (3),
.BR strcasecmp (3),
.BR strcoll (3),
.BR string (3),
.BR strncasecmp (3),
.BR strverscmp (3),
.BR wcscmp (3),
.BR wcsncmp (3)