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On 12/02/2014 12:21 PM, Steffen Wolfer wrote:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dear all, I'm having the following, interesting problem using Newlib's sscanf(). Trying to read an IP address from a string with the following code snippet: void read_ipaddr() { char *str; uint8_t a, b, c, d; int res; // This function returns a pointer to the // string that represents the IP address get_str( &str ); res = sscanf( str, "%" SCNu8 ".%" SCNu8 ".%" SCNu8 ".%" SCNu8, &a, &b, &c, &d ); ... }
As explained by others, the reason for the behavior you see is that the launchpad toolchain has C99 formats disabled. You may want to check out this toolchain compilation - https://sourceforge.net/projects/bleeding-edge/ (info here http://www.freddiechopin.info/en/articles/35-arm/87-bleeding-edge-toolchain-o-co-chodzi ). It has - among others - C99 formats enabled. I'm doing these compilations and I've been using them for over 2 years with no issues.
Regards, FCh
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