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Cannot output 0x00 (null) character

Trevor Martin

I am trying to write a very simple program to output a serial string including hex codes when I press a button.

It works fine if the string does not include 0x00, but if it does this is treated as 'end of string' and does not output.

printf ("\x01\x02\x00\x03\x04")
only outputs up to 0x02.

similarly for;
SBUF =0x01
SBUF =0x02
SBUF =0x00
SBUF =0x03
SBUF =0x04

The program is based on the hello.c sample.

Help please

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  • 0 in reply to Graham Cole 

    loop = length_of_string;
p    = address_of_string;

do
{
    putchar( *p++ );
}while( --loop != 0 )

    This will fail if loop is ever zero, e.g. the string is zero bytes long. Safe coding practices would re-write this with a while (do-while's border on evil anyhow), e.g.
    while (loop--) { putchar(*p++); }

Reply
  • 0 in reply to Graham Cole 

    loop = length_of_string;
p    = address_of_string;

do
{
    putchar( *p++ );
}while( --loop != 0 )

    This will fail if loop is ever zero, e.g. the string is zero bytes long. Safe coding practices would re-write this with a while (do-while's border on evil anyhow), e.g.
    while (loop--) { putchar(*p++); }

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