bionic (3) strcasecmp.3posix.gz

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


SYNOPSIS
       #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
       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
       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
       No errors are defined.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       None.


RATIONALE
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       wcscasecmp()

       The Base Definitions volume of POSIX.1‐2008, <strings.h>


       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 .