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

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

       #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

       The scandir() function scans the directory dirp, calling filter() on each directory entry.
       Entries for which filter() returns nonzero 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  com-
       par().	The  former  sorts  directory  entries using strcoll(3), the latter using strver-
       scmp(3) on the strings (*a)->d_name and (*b)->d_name.

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

       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.

       ENOMEM Insufficient memory to complete the operation.

       versionsort() was added to glibc in version 2.1.

       alphasort()  and  scandir() are specified in POSIX.1-2008, and are widely available.  ver-
       sionsort() is a GNU extension.

       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).

       #define _SVID_SOURCE
       /* print files in current directory in reverse order */
       #include <dirent.h>

	   struct dirent **namelist;
	   int n;

	   n = scandir(".", &namelist, 0, alphasort);
	   if (n < 0)
	   else {
	       while (n--) {
		   printf("%s\n", namelist[n]->d_name);

       closedir(3), fnmatch(3), opendir(3), readdir(3), rewinddir(3), seekdir(3), strcmp(3), str-
       coll(3), strverscmp(3), telldir(3)

       This page is part of release 3.25 of the Linux man-pages project.  A  description  of  the
       project,   and	information  about  reporting  bugs,  can  be  found  at  http://www.ker-

GNU					    2009-02-10				       SCANDIR(3)
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