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nshlib/dd: Add support for reading from/writing to standard input/output

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Test
  1. Input from stdin and output to stdout
       Keyboard input: 12345AAAAABBBBB
    nsh> dd bs=5
    1234512345AAAAAAAAAABBBBBBBBBB

  2. Input from file and output to stdout
    nsh> dd if=/etc/init.d/rc.sysinit
    mkrd -m 2 -s 512 1024
    mkfatfs /dev/ram2
    mount -t vfat /dev/ram2 "/tmp"

  3. Input from stdin and output to file
       Keyboard input: QWERT
    dd of=/data/dd_stdout bs=5

    Then, cat the output file in host (based on HostFS):
    $ cat ./dd_stdout
    QWERT

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>
This commit is contained in:
wangjianyu3
2024-10-17 16:32:15 +08:00
committed by Xiang Xiao
parent a799c3e805
commit e5a1bb1796
2 changed files with 31 additions and 25 deletions
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2
nshlib/nsh_command.c
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@@ -186,7 +186,7 @@ static const struct cmdmap_s g_cmdmap[] =
#endif
#ifndef CONFIG_NSH_DISABLE_DD
CMD_MAP("dd", cmd_dd, 3, 7,
CMD_MAP("dd", cmd_dd, 1, 7,
"if=<infile> of=<outfile> [bs=<sectsize>] [count=<sectors>] "
"[skip=<sectors>] [seek=<sectors>] [verify] [conv=<nocreat,notrunc>]"),
#endif