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strcasecmp(3posix)


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.12008, <strings.h>

COPYRIGHT

   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 .



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