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alphasort (3)
  • alphasort (3) ( FreeBSD man: Библиотечные вызовы )
  • alphasort (3) ( Русские man: Библиотечные вызовы )
  • >> alphasort (3) ( Linux man: Библиотечные вызовы )
  •  

    NAME

    scandir, alphasort, versionsort - scan a directory for matching entries
     
    

    SYNOPSIS

    #include <dirent.h>
    
    int scandir(const char *dirp, struct dirent ***namelist,
    
    int (*filter)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **));
    int alphasort(const void *a, const void *b); int versionsort(const void *a, const void *b);

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    scandir(), alphasort(): _BSD_SOURCE || _SVID_SOURCE
    versionsort(): _GNU_SOURCE  

    DESCRIPTION

    The scandir() function scans the directory dirp, calling filter() on each directory entry. Entries for which filter() returns non-zero are stored in strings allocated via malloc(3), sorted using qsort(3) with the comparison function compar(), and collected in array namelist which is allocated via malloc(3). If filter is NULL, all entries are selected.

    The alphasort() and versionsort() functions can be used as the comparison function compar(). The former sorts directory entries using strcoll(3), the latter using strverscmp(3) on the strings (*a)->d_name and (*b)->d_name.  

    RETURN VALUE

    The scandir() function returns the number of directory entries selected or -1 if an error occurs.

    The alphasort() and versionsort() functions return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.  

    ERRORS

    ENOMEM
    Insufficient memory to complete the operation.
     

    CONFORMING TO

    None of these functions is in POSIX.1-2001, but alphasort() and scandir() are under consideration for a future revision to POSIX.1.

    The functions scandir() and alphasort() are from 4.3BSD, and have been available under Linux since libc4. Libc4 and libc5 use the more precise prototype

        int alphasort(const struct dirent ** a,
                      const struct dirent **b);
    

    but glibc 2.0 returns to the imprecise BSD prototype.

    The function versionsort() is a GNU extension, available since glibc 2.1.

    Since glibc 2.1, alphasort() calls strcoll(3); earlier it used strcmp(3).  

    EXAMPLE

    #define _SVID_SOURCE
    /* print files in current directory in reverse order */
    #include <dirent.h>
    
    int
    main(void)
    {
        struct dirent **namelist;
        int n;
    
        n = scandir(".", &namelist, 0, alphasort);
        if (n < 0)
            perror("scandir");
        else {
            while (n--) {
                printf("%s\n", namelist[n]->d_name);
                free(namelist[n]);
            }
            free(namelist);
        }
    }
    
     

    SEE ALSO

    closedir(3), fnmatch(3), opendir(3), readdir(3), rewinddir(3), seekdir(3), strcmp(3), strcoll(3), strverscmp(3), telldir(3)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    EXAMPLE
    SEE ALSO
    COLOPHON


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