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strcoll (3)
  • strcoll (3) ( Solaris man: Библиотечные вызовы )
  • strcoll (3) ( FreeBSD man: Библиотечные вызовы )
  • strcoll (3) ( Русские man: Библиотечные вызовы )
  • strcoll (3) ( Linux man: Библиотечные вызовы )
  • >> strcoll (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    strcoll - string comparison using collating information
     
    

    SYNOPSIS

    #include <string.h>

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

    DESCRIPTION

    The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

    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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    Comparing Nodes
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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