source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/io_manager.c@ 1209

/*
 * io_manager.c --- the I/O manager abstraction
 */

#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <time.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#include "ext2_fs.h"
#include "ext2fs.h"

errcode_t io_channel_set_options(io_channel channel, const char *opts)
{
    errcode_t retval = 0;
    char *next, *ptr, *options, *arg;

    EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);

    if (!opts)
        return 0;

    if (!channel->manager->set_option)
        return EXT2_ET_INVALID_ARGUMENT;

    options = malloc(strlen(opts)+1);
    if (!options)
        return EXT2_ET_NO_MEMORY;
    strcpy(options, opts);
    ptr = options;

    while (ptr && *ptr) {
        next = strchr(ptr, '&');
        if (next)
            *next++ = 0;

        arg = strchr(ptr, '=');
        if (arg)
            *arg++ = 0;

        retval = (channel->manager->set_option)(channel, ptr, arg);
        if (retval)
            break;
        ptr = next;
    }
    free(options);
    return retval;
}

errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
                int count, const void *data)
{
    EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);

    if (channel->manager->write_byte)
        return channel->manager->write_byte(channel, offset,
                            count, data);

    return EXT2_ET_UNIMPLEMENTED;
}