Thread: strnlen, implicit declaration?

OK, I have managed to get rid of all the errors whilst compiling, but I am not getting the output I want from the function.

Code:

void printDescription(const char *description, const int maxLineWidth) {
	char buff[maxLineWidth + 1], *b;
	char word[maxLineWidth + 1], *w;
	b = buff;
	w = word;
	
	for(; *description !='\0'; description++) {
		*w = *description;

		if (*description == ' ' &&  strlen(w) + strlen(b) <= maxLineWidth) {
			b = strncat(b, w, strlen(w + 1));
			*w = 0;
		}

		else if (*description == ' ' && strlen(w) + strlen(b) > maxLineWidth) {
			printf("%s\n", b);
			*b = 0;
			b = w;
			*w = 0;
		}
		
		else {
			w++;
		}
	}

	printf("%s\n", b);
}

From my analysis I think the problem is where I have *w=0. What I want to do here is effectively 'reset' the string so it is effectively empty, and the pointer is back at the starting position. I suspect what it is actually doing is just putting a 0 value at the current position and continuing on. Does anybody know what I would have to change it to to get the desired result?

The only other thing I thought it could be was if strlen included the null characters in the length of the string, but surely it doesn't...

Many thanks

Yes, sorry about the pointer names, I can be rather unthoughtful when it comes to naming some things. So you mean initialize them like this?

Code:

char buff[maxLineWidth + 1] = {0}, *b;
char word[maxLineWidth + 1] = {0}, *w;

When I do this I get the following when I try to compile it:
misc.c: In function ‘printDescription’:
misc.c:12: error: variable-sized object may not be initialized
misc.c:12: warning: excess elements in array initializer
misc.c:12: warning: (near initialization for ‘buff’)
misc.c:13: error: variable-sized object may not be initialized
misc.c:13: warning: excess elements in array initializer
misc.c:13: warning: (near initialization for ‘word’)