db2/os/os_dir.c

   1 /*-
   2  * See the file LICENSE for redistribution information.
   3  *
   4  * Copyright (c) 1997, 1998
   5  *      Sleepycat Software.  All rights reserved.
   6  */
   7
   8 #include "config.h"
   9
  10 #ifndef lint
  11 static const char sccsid[] = "@(#)os_dir.c      10.15 (Sleepycat) 4/26/98";
  12 #endif /* not lint */
  13
  14 #ifndef NO_SYSTEM_INCLUDES
  15 #include <sys/types.h>
  16
  17 #if HAVE_DIRENT_H
  18 # include <dirent.h>
  19 # define NAMLEN(dirent) strlen((dirent)->d_name)
  20 #else
  21 # define dirent direct
  22 # define NAMLEN(dirent) (dirent)->d_namlen
  23 # if HAVE_SYS_NDIR_H
  24 #  include <sys/ndir.h>
  25 # endif
  26 # if HAVE_SYS_DIR_H
  27 #  include <sys/dir.h>
  28 # endif
  29 # if HAVE_NDIR_H
  30 #  include <ndir.h>
  31 # endif
  32 #endif
  33
  34 #include <errno.h>
  35 #endif
  36
  37 #include "db_int.h"
  38
  39 /*
  40  * __os_dirlist --
  41  *      Return a list of the files in a directory.
  42  *
  43  * PUBLIC: int __os_dirlist __P((const char *, char ***, int *));
  44  */
  45 int
  46 __os_dirlist(dir, namesp, cntp)
  47         const char *dir;
  48         char ***namesp;
  49         int *cntp;
  50 {
  51         struct dirent *dp;
  52         DIR *dirp;
  53         int arraysz, cnt;
  54         char **names;
  55
  56         if ((dirp = opendir(dir)) == NULL)
  57                 return (errno);
  58         names = NULL;
  59         for (arraysz = cnt = 0; (dp = readdir(dirp)) != NULL; ++cnt) {
  60                 if (cnt >= arraysz) {
  61                         arraysz += 100;
  62                         names = (char **)(names == NULL ?
  63                             __db_malloc(arraysz * sizeof(names[0])) :
  64                             __db_realloc(names, arraysz * sizeof(names[0])));
  65                         if (names == NULL)
  66                                 goto nomem;
  67                 }
  68                 if ((names[cnt] = (char *)__db_strdup(dp->d_name)) == NULL)
  69                         goto nomem;
  70         }
  71         (void)closedir(dirp);
  72
  73         *namesp = names;
  74         *cntp = cnt;
  75         return (0);
  76
  77 nomem:  if (names != NULL)
  78                 __os_dirfree(names, cnt);
  79         return (ENOMEM);
  80 }
  81
  82 /*
  83  * __os_dirfree --
  84  *      Free the list of files.
  85  *
  86  * PUBLIC: void __os_dirfree __P((char **, int));
  87  */
  88 void
  89 __os_dirfree(names, cnt)
  90         char **names;
  91         int cnt;
  92 {
  93         while (cnt > 0)
  94                 __db_free(names[--cnt]);
  95         __db_free(names);
  96 }