examples/fatdir.c

   1 //--------------------------------------------------------------------------------------------------
   2 // Copyright (C) 2022 Marcus Geelnard
   3 //
   4 // Redistribution and use in source and binary forms, with or without modification, are permitted
   5 // provided that the following conditions are met:
   6 //
   7 //   1. Redistributions of source code must retain the above copyright notice, this list of
   8 //      conditions and the following disclaimer.
   9 //
  10 //   2. Redistributions in binary form must reproduce the above copyright notice, this list of
  11 //      conditions and the following disclaimer in the documentation and/or other materials provided
  12 //      with the distribution.
  13 //
  14 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
  15 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16 // FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  17 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  19 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  20 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
  21 // WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  22 //--------------------------------------------------------------------------------------------------
  23
  24 #include <mfat.h>
  25
  26 #include <fcntl.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31
  32 static int blkread(char* ptr, unsigned block_no, void* custom) {
  33   int fd = *(int*)custom;
  34   if (lseek(fd, MFAT_BLOCK_SIZE * (size_t)block_no, SEEK_SET) == -1) {
  35     return -1;
  36   }
  37   size_t num_bytes = read(fd, ptr, MFAT_BLOCK_SIZE);
  38   return (num_bytes != MFAT_BLOCK_SIZE) && (num_bytes != 0) ? -1 : 0;
  39 }
  40
  41 static int blkwrite(const char* ptr, unsigned block_no, void* custom) {
  42   int fd = *(int*)custom;
  43   if (lseek(fd, MFAT_BLOCK_SIZE * (size_t)block_no, SEEK_SET) == -1) {
  44     return -1;
  45   }
  46   size_t num_bytes = write(fd, ptr, MFAT_BLOCK_SIZE);
  47   return (num_bytes != MFAT_BLOCK_SIZE) && (num_bytes != 0) ? -1 : 0;
  48 }
  49
  50 int main(int argc, char** argv) {
  51   // Get arguments.
  52   if (argc != 3) {
  53     printf("Usage: %s FATIMAGE DIR\n", argv[0]);
  54     return 1;
  55   }
  56   const char* img_path = argv[1];
  57   const char* dir_name = argv[2];
  58
  59   // Open the FAT image file or device.
  60   int img_fd = open(img_path, O_RDONLY);
  61   if (img_fd == -1) {
  62     fprintf(stderr, "*** Failed to open the FAT image\n");
  63     return 1;
  64   }
  65
  66   // Mount the image in MFAT.
  67   if (mfat_mount(blkread, blkwrite, &img_fd) == -1) {
  68     close(img_fd);
  69     fprintf(stderr, "*** Failed to init MFAT\n");
  70     return 1;
  71   }
  72
  73   // Show the files in the directory.
  74   mfat_dir_t* dirp = mfat_opendir(dir_name);
  75   if (dirp != NULL) {
  76     mfat_dirent_t* dirent;
  77     while ((dirent = mfat_readdir(dirp)) != NULL) {
  78       // Construct full path.
  79       char path[256];
  80       snprintf(&path[0], 255, "%s/%s", dir_name, dirent->d_name);
  81       path[255] = 0;
  82
  83       // Stat and print file info + name.
  84       mfat_stat_t stat;
  85       if (mfat_stat(path, &stat) != -1) {
  86         printf("%u-%02u-%02u %02u:%02u:%02u\t%s\t%u\t%s\n",
  87                stat.st_mtim.year,
  88                stat.st_mtim.month,
  89                stat.st_mtim.day,
  90                stat.st_mtim.hour,
  91                stat.st_mtim.minute,
  92                stat.st_mtim.second,
  93                MFAT_S_ISDIR(stat.st_mode) ? "<DIR>" : "",
  94                stat.st_size,
  95                dirent->d_name);
  96       } else {
  97         fprintf(stderr, "*** Failed to stat %s\n", path);
  98       }
  99     }
 100     mfat_closedir(dirp);
 101   } else {
 102     fprintf(stderr, "*** Failed to open dir %s\n", dir_name);
 103   }
 104
 105   // Unmount and close down.
 106   mfat_unmount();
 107   close(img_fd);
 108
 109   return 0;
 110 }