STRCASECMP(P) POSIX Programmer's Manual STRCASECMP(P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAME
strcasecmp, strncasecmp - case-insensitive string comparisons
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 shall compare, while ignoring differences in
case, the string pointed to by s1 to the string pointed to by s2. The
strncasecmp() function shall compare, while ignoring differences in
case, not more than n bytes from the string pointed to by s1 to the
string pointed to by s2.
In the POSIX locale, strcasecmp() and strncasecmp() shall behave as if
the strings had been converted to lowercase and then a byte comparison
performed. The results are unspecified in other locales.
RETURN VALUE
Upon completion, strcasecmp() shall return an integer greater than,
equal to, or less than 0, if the string pointed to by s1 is, ignoring
case, greater than, equal to, or less than the string pointed to by s2,
respectively.
Upon successful completion, strncasecmp() shall return an integer
greater than, equal to, or less than 0, if the possibly null-terminated
array pointed to by s1 is, ignoring case, greater than, equal to, or
less than the possibly null-terminated array pointed to by s2, respec‐
tively.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
The Base Definitions volume of IEEE Std 1003.1-2001, <strings.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 STRCASECMP(P)
