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Linux 2.6 - man page for strcoll (linux section 3posix)

STRCOLL(P)			    POSIX Programmer's Manual			       STRCOLL(P)

NAME
       strcoll - string comparison using collating information

SYNOPSIS
       #include <string.h>

       int strcoll(const char *s1, const char *s2);

DESCRIPTION
       The  strcoll() function shall compare the string pointed to by s1 to the string pointed to
       by s2, both interpreted as appropriate to the LC_COLLATE category of the current locale.

       The strcoll() function shall not change the setting of errno if successful.

       Since no return value is reserved to indicate an error, an application  wishing	to  check
       for error situations should set errno to 0, then call strcoll(), then check errno.

RETURN VALUE
       Upon  successful  completion, strcoll() shall return an integer greater than, equal to, or
       less than 0, according to whether the string pointed to by s1 is greater than,  equal  to,
       or  less  than the string pointed to by s2 when both are interpreted as appropriate to the
       current locale.	  On error, strcoll() may set errno, but no return value is  reserved  to
       indicate an error.

ERRORS
       The strcoll() function may fail if:

       EINVAL The  s1  or  s2  arguments  contain  characters outside the domain of the collating
	      sequence.

       The following sections are informative.

EXAMPLES
   Comparing Nodes
       The following example uses an application-defined function, node_compare(), to compare two
       nodes based on an alphabetical ordering of the string field.

	      #include <string.h>
	      ...
	      struct node { /* These are stored in the table. */
		  char *string;
		  int length;
	      };
	      ...
	      int node_compare(const void *node1, const void *node2)
	      {
		  return strcoll(((const struct node *)node1)->string,
		      ((const struct node *)node2)->string);
	      }
	      ...

APPLICATION USAGE
       The strxfrm() and strcmp() functions should be used for sorting large lists.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       strcmp() , strxfrm() , the Base Definitions volume of IEEE Std 1003.1-2001, <string.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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       STRCOLL(P)


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