GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/vi/build/../vi/v_section.c Lines: 0 82 0.0 %
Date: 2017-11-13 Branches: 0 96 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: v_section.c,v 1.7 2014/11/12 04:28:41 bentley Exp $	*/
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/*-
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 * Copyright (c) 1992, 1993, 1994
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 *	The Regents of the University of California.  All rights reserved.
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 * Copyright (c) 1992, 1993, 1994, 1995, 1996
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 *	Keith Bostic.  All rights reserved.
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 *
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 * See the LICENSE file for redistribution information.
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 */
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#include "config.h"
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "../common/common.h"
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#include "vi.h"
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/*
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 * !!!
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 * In historic vi, the section commands ignored empty lines, unlike the
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 * paragraph commands, which was probably okay.  However, they also moved
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 * to the start of the last line when there where no more sections instead
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 * of the end of the last line like the paragraph commands.  I've changed
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 * the latter behavior to match the paragraph commands.
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 *
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 * In historic vi, a section was defined as the first character(s) of the
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 * line matching, which could be followed by anything.  This implementation
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 * follows that historic practice.
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 *
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 * !!!
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 * The historic vi documentation (USD:15-10) claimed:
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 *	The section commands interpret a preceding count as a different
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 *	window size in which to redraw the screen at the new location,
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 *	and this window size is the base size for newly drawn windows
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 *	until another size is specified.  This is very useful if you are
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 *	on a slow terminal ...
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 *
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 * I can't get the 4BSD vi to do this, it just beeps at me.  For now, a
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 * count to the section commands simply repeats the command.
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 */
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/*
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 * v_sectionf -- [count]]]
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 *	Move forward count sections/functions.
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 *
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 * !!!
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 * Using ]] as a motion command was a bit special, historically.  It could
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 * match } as well as the usual { and section values.  If it matched a { or
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 * a section, it did NOT include the matched line.  If it matched a }, it
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 * did include the line.  No clue why.
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 *
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 * PUBLIC: int v_sectionf(SCR *, VICMD *);
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 */
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int
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v_sectionf(SCR *sp, VICMD *vp)
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{
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	recno_t cnt, lno;
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	size_t len;
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	char *p, *list, *lp;
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	/* Get the macro list. */
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	if ((list = O_STR(sp, O_SECTIONS)) == NULL)
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		return (1);
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	/*
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	 * !!!
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	 * If the starting cursor position is at or before any non-blank
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	 * characters in the line, i.e. the movement is cutting all of the
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	 * line's text, the buffer is in line mode.  It's a lot easier to
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	 * check here, because we know that the end is going to be the start
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	 * or end of a line.
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	 */
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	if (ISMOTION(vp)) {
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		if (vp->m_start.cno == 0)
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			F_SET(vp, VM_LMODE);
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		else {
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			vp->m_stop = vp->m_start;
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			vp->m_stop.cno = 0;
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			if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
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				return (1);
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			if (vp->m_start.cno <= vp->m_stop.cno)
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				F_SET(vp, VM_LMODE);
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		}
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	}
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	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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	for (lno = vp->m_start.lno; !db_get(sp, ++lno, 0, &p, &len);) {
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		if (len == 0)
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			continue;
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		if (p[0] == '{' || (ISMOTION(vp) && p[0] == '}')) {
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			if (!--cnt) {
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				if (p[0] == '{')
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					goto adjust1;
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				goto adjust2;
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			}
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			continue;
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		}
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		/*
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		 * !!!
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		 * Historic documentation (USD:15-11, 4.2) said that formfeed
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		 * characters (^L) in the first column delimited sections.
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		 * The historic code mentions formfeed characters, but never
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		 * implements them.  Seems reasonable, do it.
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		 */
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		if (p[0] == '\014') {
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			if (!--cnt)
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				goto adjust1;
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			continue;
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		}
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		if (p[0] != '.' || len < 2)
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			continue;
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		for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
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			if (lp[0] == p[1] &&
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			    ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
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			    !--cnt) {
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				/*
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				 * !!!
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				 * If not cutting this line, adjust to the end
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				 * of the previous one.  Otherwise, position to
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				 * column 0.
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				 */
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adjust1:			if (ISMOTION(vp))
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					goto ret1;
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adjust2:			vp->m_stop.lno = lno;
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				vp->m_stop.cno = 0;
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				goto ret2;
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			}
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	}
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	/* If moving forward, reached EOF, check to see if we started there. */
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	if (vp->m_start.lno == lno - 1) {
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		v_eof(sp, NULL);
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		return (1);
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	}
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ret1:	if (db_get(sp, --lno, DBG_FATAL, NULL, &len))
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		return (1);
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	vp->m_stop.lno = lno;
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	vp->m_stop.cno = len ? len - 1 : 0;
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	/*
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	 * Non-motion commands go to the end of the range.  Delete and
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	 * yank stay at the start of the range.  Ignore others.
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	 */
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ret2:	if (ISMOTION(vp)) {
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		vp->m_final = vp->m_start;
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		if (F_ISSET(vp, VM_LMODE))
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			vp->m_final.cno = 0;
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	} else
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		vp->m_final = vp->m_stop;
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	return (0);
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}
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/*
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 * v_sectionb -- [count][[
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 *	Move backward count sections/functions.
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 *
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 * PUBLIC: int v_sectionb(SCR *, VICMD *);
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 */
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int
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v_sectionb(SCR *sp, VICMD *vp)
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{
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	size_t len;
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	recno_t cnt, lno;
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	char *p, *list, *lp;
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	/* An empty file or starting from line 1 is always illegal. */
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	if (vp->m_start.lno <= 1) {
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		v_sof(sp, NULL);
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		return (1);
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	}
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	/* Get the macro list. */
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	if ((list = O_STR(sp, O_SECTIONS)) == NULL)
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		return (1);
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	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
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	for (lno = vp->m_start.lno; !db_get(sp, --lno, 0, &p, &len);) {
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		if (len == 0)
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			continue;
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		if (p[0] == '{') {
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			if (!--cnt)
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				goto adjust1;
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			continue;
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		}
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		/*
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		 * !!!
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		 * Historic documentation (USD:15-11, 4.2) said that formfeed
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		 * characters (^L) in the first column delimited sections.
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		 * The historic code mentions formfeed characters, but never
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		 * implements them.  Seems reasonable, do it.
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		 */
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		if (p[0] == '\014') {
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			if (!--cnt)
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				goto adjust1;
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			continue;
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		}
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		if (p[0] != '.' || len < 2)
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			continue;
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		for (lp = list; *lp != '\0'; lp += 2 * sizeof(*lp))
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			if (lp[0] == p[1] &&
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			    ((lp[1] == ' ' && len == 2) || lp[1] == p[2]) &&
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			    !--cnt) {
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adjust1:			vp->m_stop.lno = lno;
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				vp->m_stop.cno = 0;
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				goto ret1;
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			}
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	}
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	/*
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	 * If moving backward, reached SOF, which is a movement sink.
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	 * We already checked for starting there.
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	 */
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	vp->m_stop.lno = 1;
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	vp->m_stop.cno = 0;
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	/*
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	 * All commands move to the end of the range.
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	 *
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	 * !!!
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	 * Historic practice is the section cut was in line mode if it started
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	 * from column 0 and was in the backward direction.  Otherwise, left
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	 * motion commands adjust the starting point to the character before
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	 * the current one.  What makes this worse is that if it cut to line
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	 * mode it also went to the first non-<blank>.
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	 */
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ret1:	if (vp->m_start.cno == 0) {
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		F_CLR(vp, VM_RCM_MASK);
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		F_SET(vp, VM_RCM_SETFNB);
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		--vp->m_start.lno;
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		F_SET(vp, VM_LMODE);
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	} else
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		--vp->m_start.cno;
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	vp->m_final = vp->m_stop;
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	return (0);
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}