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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 *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 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 compari-
       son function compar().  The former sorts directory entries  using  str-
       coll(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  consid-
       ered  to  be respectively less than, equal to, or greater than the sec-
       ond.

ERRORS
       ENOMEM Insufficient memory to complete the operation.

VERSIONS
       versionsort() was added to glibc in version 2.1.

CONFORMING TO
       alphasort() and scandir() are specified in POSIX.1-2008, and are widely
       available.  versionsort() 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  pre-
       cise 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  str-
       cmp(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 3.25 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/.

GNU                               2009-02-10                        SCANDIR(3)
 

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Gedruckt am: 21.09.2017 07:15 GMT+0200 (2017-09-21T07:15:53+02:00)