source: MondoRescue/branches/3.0/mindi-busybox/miscutils/flashcp.c@ 2899

/* vi: set sw=4 ts=4: */
/*
 * busybox reimplementation of flashcp
 *
 * (C) 2009 Stefan Seyfried <seife@sphairon.com>
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */

#include "libbb.h"
#include <mtd/mtd-user.h>

#define MTD_DEBUG 0

#define OPT_v (1 << 0)

#define BUFSIZE (8 * 1024)

static void progress(int mode, uoff_t count, uoff_t total)
{
    uoff_t percent;

    if (!option_mask32) //if (!(option_mask32 & OPT_v))
        return;
    percent = count * 100;
    if (total)
        percent = (unsigned) (percent / total);
    printf("\r%s: %"OFF_FMT"u/%"OFF_FMT"u (%u%%) ",
        (mode == 0) ? "Erasing block" : ((mode == 1) ? "Writing kb" : "Verifying kb"),
        count, total, (unsigned)percent);
    fflush_all();
}

static void progress_newline(void)
{
    if (!option_mask32) //if (!(option_mask32 & OPT_v))
        return;
    bb_putchar('\n');
}

int flashcp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int flashcp_main(int argc UNUSED_PARAM, char **argv)
{
    int fd_f, fd_d; /* input file and mtd device file descriptors */
    int i;
    uoff_t erase_count;
    unsigned opts;
    struct mtd_info_user mtd;
    struct erase_info_user e;
    struct stat statb;
//  const char *filename, *devicename;
    RESERVE_CONFIG_UBUFFER(buf, BUFSIZE);
    RESERVE_CONFIG_UBUFFER(buf2, BUFSIZE);

    opt_complementary = "=2"; /* exactly 2 non-option args: file, dev */
    opts = getopt32(argv, "v");
    argv += optind;
//  filename = *argv++;
//  devicename = *argv;
#define filename argv[0]
#define devicename argv[1]

    /* open input file and mtd device and do sanity checks */
    fd_f = xopen(filename, O_RDONLY);
    fstat(fd_f, &statb);
    fd_d = xopen(devicename, O_SYNC | O_RDWR);
#if !MTD_DEBUG
    if (ioctl(fd_d, MEMGETINFO, &mtd) < 0) {
        bb_error_msg_and_die("%s is not a MTD flash device", devicename);
    }
    if (statb.st_size > mtd.size) {
        bb_error_msg_and_die("%s bigger than %s", filename, devicename);
    }
#else
    mtd.erasesize = 64 * 1024;
#endif

    /* always erase a complete block */
    erase_count = (uoff_t)(statb.st_size + mtd.erasesize - 1) / mtd.erasesize;
    /* erase 1 block at a time to be able to give verbose output */
    e.length = mtd.erasesize;
#if 0
/* (1) bloat
 * (2) will it work for multi-gigabyte devices?
 * (3) worse wrt error detection granularity
 */
    /* optimization: if not verbose, erase in one go */
    if (!opts) { // if (!(opts & OPT_v))
        e.length = mtd.erasesize * erase_count;
        erase_count = 1;
    }
#endif
    e.start = 0;
    for (i = 1; i <= erase_count; i++) {
        progress(0, i, erase_count);
        errno = 0;
#if !MTD_DEBUG
        if (ioctl(fd_d, MEMERASE, &e) < 0) {
            bb_perror_msg_and_die("erase error at 0x%llx on %s",
                (long long)e.start, devicename);
        }
#else
        usleep(100*1000);
#endif
        e.start += mtd.erasesize;
    }
    progress_newline();

    /* doing this outer loop gives significantly smaller code
     * than doing two separate loops for writing and verifying */
    for (i = 1; i <= 2; i++) {
        uoff_t done;
        unsigned count;

        xlseek(fd_f, 0, SEEK_SET);
        xlseek(fd_d, 0, SEEK_SET);
        done = 0;
        count = BUFSIZE;
        while (1) {
            uoff_t rem = statb.st_size - done;
            if (rem == 0)
                break;
            if (rem < BUFSIZE)
                count = rem;
            progress(i, done / 1024, (uoff_t)statb.st_size / 1024);
            xread(fd_f, buf, count);
            if (i == 1) {
                int ret;
                errno = 0;
                ret = full_write(fd_d, buf, count);
                if (ret != count) {
                    bb_perror_msg_and_die("write error at 0x%"OFF_FMT"x on %s, "
                        "write returned %d",
                        done, devicename, ret);
                }
            } else { /* i == 2 */
                xread(fd_d, buf2, count);
                if (memcmp(buf, buf2, count)) {
                    bb_error_msg_and_die("verification mismatch at 0x%"OFF_FMT"x", done);
                }
            }

            done += count;
        }

        progress_newline();
    }
    /* we won't come here if there was an error */

    return EXIT_SUCCESS;
}