scandir - phpMan

SCANDIR(3)                 Linux Programmer’s Manual                SCANDIR(3)



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

SYNOPSIS
       #include <dirent.h>

       int scandir(const char *dir, 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);

DESCRIPTION
       The  scandir() function scans the directory dir, calling filter() on each directory
       entry.  Entries for which filter() returns non-zero are stored in strings allocated
       via  malloc(), sorted using qsort() with the comparison function compar(), and col-
       lected in array namelist which is allocated via malloc().  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.  LSB has deprecated the  library  call  alpha-
       sort() and never contained scandir().

       The  functions  scandir() and alphasort() are from BSD 4.3, 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
       /* print files in current directory in reverse order */
       #include <dirent.h>
       main(){
           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), str-
       cmp(3), strcoll(3), strverscmp(3), telldir(3)



GNU                               2001-12-26                        SCANDIR(3)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2009-01-10 10:55 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)