afs_common.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7
   8 /** \file afs_common.c Functions common to all audio file selectors. */
   9
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12
  13
  14 #include "para.h"
  15 #include "fd.h"
  16 #include "server.cmdline.h"
  17 #include "afh.h"
  18 #include "server.h"
  19 #include "vss.h"
  20 #include <dirent.h> /* readdir() */
  21 #include <sys/stat.h> /* stat */
  22 #include <sys/types.h> /* mode_t */
  23 #include "error.h"
  24 #include "string.h"
  25
  26 /**
  27  * Traverse the given directory recursively.
  28  *
  29  * \param dirname The directory to traverse.
  30  * \param f The function to call for each entry.
  31  *
  32  * For each regular file whose filename ends in .yyy, where yyy is a supported
  33  * audio format, the supplied function \a f is called.  The directory and
  34  * filename component of the regular file are passed to \a f.
  35  *
  36  * \return On success, 1 is returned. Otherwise, this function returns a
  37  * negative value which indicates the kind of the error.
  38  */
  39 int find_audio_files(const char *dirname, int (*f)(const char *, const char *))
  40 {
  41         DIR *dir = NULL;
  42         int ret, ret2, cwd_fd;
  43         struct dirent *entry;
  44
  45         ret = para_opendir(dirname, &dir, &cwd_fd);
  46         if (ret < 0)
  47                 return ret;
  48         /* scan cwd recursively */
  49         while ((entry = readdir(dir))) {
  50                 mode_t m;
  51                 char *tmp;
  52                 struct stat s;
  53
  54                 if (!strcmp(entry->d_name, "."))
  55                         continue;
  56                 if (!strcmp(entry->d_name, ".."))
  57                         continue;
  58                 ret = -E_LSTAT;
  59                 if (lstat(entry->d_name, &s) == -1)
  60                         continue;
  61                 m = s.st_mode;
  62                 if (!S_ISREG(m) && !S_ISDIR(m)) /* skip links, sockets, ... */
  63                         continue;
  64                 if (S_ISREG(m)) { /* regular file */
  65                         if (guess_audio_format(entry->d_name) < 0)
  66                                 continue;
  67                         ret = f(dirname, entry->d_name);
  68                         if (ret < 0)
  69                                 goto out;
  70                         continue;
  71                 }
  72                 /* directory */
  73                 tmp = make_message("%s/%s", dirname, entry->d_name);
  74                 ret = find_audio_files(tmp, f);
  75                 free(tmp);
  76                 if (ret < 0)
  77                         goto out;
  78         }
  79         ret = 1;
  80 out:
  81         if (dir)
  82                 closedir(dir);
  83         ret2 = fchdir(cwd_fd);
  84         if (ret2 < 0 && ret >= 0)
  85                 ret = ret2;
  86         close(cwd_fd);
  87         if (ret < 0)
  88                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
  89         return ret;
  90 }