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STRCASECMP(3P) POSIX Programmer's Manual STRCASECMP(3P)
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.
strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l — case-
insensitive string comparisons
#include <strings.h>
int strcasecmp(const char *s1, const char *s2);
int strcasecmp_l(const char *s1, const char *s2,
locale_t locale);
int strncasecmp(const char *s1, const char *s2, size_t n);
int strncasecmp_l(const char *s1, const char *s2,
size_t n, locale_t locale);
The strcasecmp() and strcasecmp_l() functions shall compare, while
ignoring differences in case, the string pointed to by s1 to the
string pointed to by s2. The strncasecmp() and strncasecmp_l()
functions 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.
The strcasecmp() and strncasecmp() functions use the current locale
to determine the case of the characters.
The strcasecmp_l() and strncasecmp_l() functions use the locale
represented by locale to determine the case of the characters.
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.
The behavior is undefined if the locale argument to strcasecmp_l() or
strncasecmp_l() is the special locale object LC_GLOBAL_LOCALE or is
not a valid locale object handle.
Upon completion, strcasecmp() and strcasecmp_l() 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() and strncasecmp_l() 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, respectively.
No errors are defined.
The following sections are informative.
None.
None.
None.
None.
wcscasecmp(3p)
The Base Definitions volume of POSIX.1‐2008, strings.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 STRCASECMP(3P)
Pages that refer to this page: strings.h(0p), strncasecmp(3p), wcscasecmp(3p)