I need to read IP addresses into a char array for working on it later. Since IP octets can be as big as 256, I thought it would be good to use unsigned char array to read them. This is how I intend to use it.
sprintf(buf,"%d.%d.%d.%d",ip24,ip16,ip8,ip);
But it appears that first argument of sprintf should be char* and hence it's throwing the below warning. How do I deal with it.
expected ‘char * restrict’ but argument is of type ‘unsigned char *’
The type of buf should be char* in first place. The fact that an IP octet can be as big as 256 (that is it is a unsigned char) has nothing to do with the fact that buf is an array of unsigned char.
sprint wants a char* as first argument, so give it a char:
sprintf((char*)buf,"%d.%d.%d.%d",ip24,ip16,ip8,ip);
this can avoid the warning. But why not use char* buf?
unsigned char* but char*.
You need to declare buf as a char* or char buf[16] instead of unsigned char*, or cast it when using, if changing the data type of buf is a hassle.
As you rightly stated, referring to the man page for sprintf(), it indicates that it expected the first argument of the type char *str.
char buf[16]="255.255.255.255"chars. This question indicates a lack of thought about what you're doing.bufis obviously the wrong type. Declare it as achar *rather than anunsigned char*. And depending on the type ofipand friends, you probably want to use%urather than%d(and octets cannot be as large as 256; the valid range is [0,255]).