Split a string and convert individual pieces to hexadecimal

Question

I have a string like "03FE" holding hexadecimal values. I need to split this string in two parts, and convert each individual part to the equivalent hexadecimal.

That is, I need 0x03 in one variable and 0xFE in another variable.

For example, if I didn't have to split the string, this is how I would have done it:

 char *p;
 uint32_t uv=0;
 uv=strtoul(&string_to_convert, &p, 16);

How shall I proceed if I needed to split the string?

There is no such thing as a "hexa variable". The variable contains an integer. The "hexadecimal" part is just way to present that integer to humans, as a string. The integer itself is not hex. — unwind, Jun 10 '15 at 06:11

score 5 · Accepted Answer · edited Jun 10 '15 at 05:55

5

Split the output of strtoul instead:

uint8_t uv_hi = uv >> 8;
uint8_t uv_lo = uv & 0xFF;

edited Jun 10 '15 at 05:55

R Sahu

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answered Jun 10 '15 at 05:54

barak manos

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Sourav Ghosh · Answer 2 · 2015-06-10T06:03:29.327

I think

You can create one additional buffer of length n+1, where you want to split the string into n byte tokens
Use snprintf() to print out n characters to the temporary buffer.
Use strtoul() to convert the temporary buffer content to hex value.
Iterate over till you have tokens left.

This way, you can have a generic approach to tokenize and convert a source string of any length into tokens and then convert them to hex values.

Split a string and convert individual pieces to hexadecimal

2 Answers2