PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

STRCASECMP(3P)            POSIX Programmer's Manual           STRCASECMP(3P)

PROLOG         top

       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         top

       strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l — case-
       insensitive string comparisons

SYNOPSIS         top

       #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);

DESCRIPTION         top

       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.

RETURN VALUE         top

       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.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       wcscasecmp(3p)

       The Base Definitions volume of POSIX.1‐2008, strings.h(0p)

COPYRIGHT         top

       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)