nandwrite: new applet

function                                             old     new   delta
nandwrite_main                                         -     382    +382
packed_usage                                       27119   27135     +16
applet_names                                        2275    2285     +10
applet_main                                         1340    1344      +4
applet_nameofs                                       670     672      +2
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 4/0 up/down: 414/0)             Total: 414 bytes

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>

diff --git a/miscutils/nandwrite.c b/miscutils/nandwrite.c
new file mode 100644 (file)
index 0000000..a20f7f3
--- /dev/null
+++ b/miscutils/nandwrite.c
@@ -0,0 +1,128 @@
+/*
+ * nandwrite.c - ported to busybox from mtd-utils
+ *
+ * Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ *
+ * TODO: add support for large (>4GB) MTD devices
+ */
+
+//applet:IF_NANDWRITE(APPLET(nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
+
+//config:config NANDWRITE
+//config:      bool "nandwrite"
+//config:      default n
+//config:      depends on PLATFORM_LINUX
+//config:      help
+//config:        Write to the specified MTD device, with bad blocks awareness
+
+#include "libbb.h"
+#include <mtd/mtd-user.h>
+
+//usage:#define nandwrite_trivial_usage
+//usage:       "[-p] [-s ADDR] MTD_DEVICE [FILE]"
+//usage:#define nandwrite_full_usage "\n\n"
+//usage:       "Write to the specified MTD device\n"
+//usage:     "\nOptions:"
+//usage:     "\n       -p      Pad to page size"
+//usage:     "\n       -s ADDR Start address"
+
+static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
+               unsigned block_offset)
+{
+       while (1) {
+               loff_t offs;
+               if (block_offset >= meminfo->size)
+                       bb_error_msg_and_die("not enough space in MTD device");
+               offs = block_offset;
+               if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
+                       return block_offset;
+               /* ioctl returned 1 => "bad block" */
+               printf("Skipping bad block at 0x%08x\n", block_offset);
+               block_offset += meminfo->erasesize;
+       }
+}
+
+int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int nandwrite_main(int argc UNUSED_PARAM, char **argv)
+{
+       unsigned opts;
+       int fd;
+       ssize_t cnt;
+       unsigned mtdoffset, meminfo_writesize;
+       struct mtd_info_user meminfo;
+       unsigned char *filebuf;
+       const char *opt_s = "0";
+       enum {
+               OPT_p = (1 << 0),
+               OPT_s = (1 << 1),
+       };
+
+       opt_complementary = "-1:?2";
+       opts = getopt32(argv, "ps:", &opt_s);
+       argv += optind;
+
+       if (argv[1])
+               xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
+
+       fd = xopen(argv[0], O_RDWR);
+       xioctl(fd, MEMGETINFO, &meminfo);
+
+       mtdoffset = xatou(opt_s);
+
+       /* Pull it into a CPU register (hopefully) - smaller code that way */
+       meminfo_writesize = meminfo.writesize;
+
+       if (mtdoffset & (meminfo_writesize - 1))
+               bb_error_msg_and_die("start address is not page aligned");
+
+       filebuf = xmalloc(meminfo_writesize);
+
+       cnt = -1;
+       while (mtdoffset < meminfo.size) {
+               unsigned blockstart = mtdoffset & ~(meminfo.erasesize - 1);
+               if (blockstart == mtdoffset) {
+                       /* starting a new eraseblock */
+                       mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
+                       printf("Writing at 0x%08x\n", mtdoffset);
+               }
+               /* get some more data from input */
+               cnt = full_read(STDIN_FILENO, filebuf, meminfo_writesize);
+               if (cnt == 0) {
+                       /* even with -p, we do not pad past the end of input
+                        * (-p only zero-pads last incomplete page)
+                        */
+                       break;
+               }
+               if (cnt < meminfo_writesize) {
+                       if (!(opts & OPT_p))
+                               bb_error_msg_and_die("input size is not rounded up to page size, "
+                                               "use -p to zero pad");
+                       /* zero pad to end of write block */
+                       memset(filebuf + cnt, 0, meminfo_writesize - cnt);
+               }
+               xlseek(fd, mtdoffset, SEEK_SET);
+               xwrite(fd, filebuf, meminfo_writesize);
+               mtdoffset += meminfo_writesize;
+               if (cnt < meminfo_writesize)
+                       break;
+       }
+
+       if (cnt != 0) {
+               /* We filled entire MTD, but did we reach EOF on input? */
+               if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
+                       /* no */
+                       bb_error_msg_and_die("not enough space in MTD device");
+               }
+       }
+
+       if (ENABLE_FEATURE_CLEAN_UP) {
+               free(filebuf);
+               close(fd);
+       }
+
+       return EXIT_SUCCESS;
+}