iswhite
iswhite(char c)
#define iswhite isspace /* use the ctype macro */
#define iswhite(c) ((c == ' ') || (c == '\t')) /* check for white space */
#define iswhite(arg) _wht[arg & 0xff] /* T if char is white */
#define iswhite(c) ((c) == ' ' || (c) == '\t')