46  *	the physical character column within the line, including space
90  *	if specified, the physical character column within the line.
134 	/* Macro to return the display length of any signal character. */  in vs_columns()
140 	 * of the current screen, and the character was a tab, reset the  in vs_columns()
143 	 * character in the next screen.  in vs_columns()
179 	 * tab character displays correctly.  in vs_columns()
189  *	character closest to the currently most attractive character
199 	/* Last character is easy, and common. */  in vs_rcm()
206 	/* First character is easy, and common. */  in vs_rcm()
216  *	character closest to the specified screen column.
247 		 * physical character in the line.  in vs_colpos()
254 		 * the end of the current screen, and the character was a tab,  in vs_colpos()
256 		 * of the character is displayed in the next screen.  in vs_colpos()
264 	/* Step through the line until reach the right character or EOL. */  in vs_colpos()
269 		 * If we've reached the specific character, there are three  in vs_colpos()
272 		 * 1: scno == cno, i.e. the current character ends at the  in vs_colpos()
273 		 *    screen character we care about.  in vs_colpos()
274 		 *	a: off < llen - 1, i.e. not the last character in  in vs_colpos()
275 		 *	   the line, return the offset of the next character.  in vs_colpos()
276 		 *	b: else return the offset of the last character.  in vs_colpos()
277 		 * 2: scno != cno, i.e. this character overruns the character  in vs_colpos()
278 		 *    we care about, return the offset of this character.  in vs_colpos()
289 	/* No such character; return the start of the last character. */  in vs_colpos()