release/src/router/busybox/e2fsprogs/old_e2fsprogs/ext2fs/io_manager.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * io_manager.c --- the I/O manager abstraction
   4  */
   5
   6 #include <stdio.h>
   7 #include <string.h>
   8 #if HAVE_UNISTD_H
   9 #include <unistd.h>
  10 #endif
  11 #include <fcntl.h>
  12 #include <time.h>
  13 #if HAVE_SYS_STAT_H
  14 #include <sys/stat.h>
  15 #endif
  16 #if HAVE_SYS_TYPES_H
  17 #include <sys/types.h>
  18 #endif
  19
  20 #include "ext2_fs.h"
  21 #include "ext2fs.h"
  22
  23 errcode_t io_channel_set_options(io_channel channel, const char *opts)
  24 {
  25         errcode_t retval = 0;
  26         char *next, *ptr, *options, *arg;
  27
  28         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
  29
  30         if (!opts)
  31                 return 0;
  32
  33         if (!channel->manager->set_option)
  34                 return EXT2_ET_INVALID_ARGUMENT;
  35
  36         options = malloc(strlen(opts)+1);
  37         if (!options)
  38                 return EXT2_ET_NO_MEMORY;
  39         strcpy(options, opts);
  40         ptr = options;
  41
  42         while (ptr && *ptr) {
  43                 next = strchr(ptr, '&');
  44                 if (next)
  45                         *next++ = 0;
  46
  47                 arg = strchr(ptr, '=');
  48                 if (arg)
  49                         *arg++ = 0;
  50
  51                 retval = (channel->manager->set_option)(channel, ptr, arg);
  52                 if (retval)
  53                         break;
  54                 ptr = next;
  55         }
  56         free(options);
  57         return retval;
  58 }
  59
  60 errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
  61                                 int count, const void *data)
  62 {
  63         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
  64
  65         if (channel->manager->write_byte)
  66                 return channel->manager->write_byte(channel, offset,
  67                                                     count, data);
  68
  69         return EXT2_ET_UNIMPLEMENTED;
  70 }