Add interactive Key-Value app

[bradjc]

This app can set/get/delete keys through stdin.

I also added sync functions to make the app easier to write.

[alistair23]

If key_end is 64 then won't this overflow?

[bradjc]

Worst case is it copies the entire buffer minus the "set " at the beginning, so it should fit.

[alistair23]

Isn't the worst case an overflow?

If key_end is 64 then we have the following:

      int key_start   = 4;
      int key_end     = 64; // A valid result from find_end()
      int key_len     = 60;
      int value_start = 65;
      int value_end   = ??;
      int value_len   = ??;

     char read_buf[64];

This memcpy() will become:

       memcpy(key_buf, read_buf + 4, 60);

which is ok,

    key_buf[60] = '\0';

Seems like the wrong place to set the terminator though

but

    memcpy(value_buf, read_buf + 65, ??);

Is an overflow

[ppannuto]

bors r+

[bors]

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