ISspace
while ((ch = *bufptr) != '\0' && !ISspace(ch))
while ((ch = *bufptr) != '\0' && !ISspace(ch))
while ((ch = *bufptr) != '\0' && !ISspace(ch))
while ((ch = *bufptr) != '\0' && ISspace(ch))
while ((ch = *s) != '\0' && !ISspace(ch)) /* note else-clauses above */
while ((ch = *s) != '\0' && ISspace(ch))
while (ISspace(*envptr)) /* must discard leading spaces */
while (ISspace(*envptr))