mailmime_write - col parameter

int mailmime_write(FILE * f, int * col,
		   struct mailmime * build_info);

What is this col parameter? In my documentation it is described as:

"col current column is given for wrapping purpose in (* col), the 
resulting columns will be returned.."

Should I be concerned about this in top-level call? Is it enough to call 
this function once for given FILE* and struct mailmime*?

STF

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