GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/vi/build/../ex/ex_join.c Lines: 0 51 0.0 %
Date: 2017-11-13 Branches: 0 96 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: ex_join.c,v 1.8 2016/01/06 22:28:52 millert 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 <bitstring.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../common/common.h"
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/*
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 * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
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 *	Join lines.
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 *
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 * PUBLIC: int ex_join(SCR *, EXCMD *);
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 */
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int
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ex_join(SCR *sp, EXCMD *cmdp)
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{
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	recno_t from, to;
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	size_t blen, clen, len, tlen;
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	int echar, extra, first;
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	char *bp, *p, *tbp;
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	NEEDFILE(sp, cmdp);
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	from = cmdp->addr1.lno;
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	to = cmdp->addr2.lno;
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	/* Check for no lines to join. */
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	if (!db_exist(sp, from + 1)) {
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		msgq(sp, M_ERR, "No following lines to join");
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		return (1);
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	}
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	GET_SPACE_RET(sp, bp, blen, 256);
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	/*
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	 * The count for the join command was off-by-one,
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	 * historically, to other counts for other commands.
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	 */
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	if (FL_ISSET(cmdp->iflags, E_C_COUNT))
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		++cmdp->addr2.lno;
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	/*
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	 * If only a single address specified, or, the same address
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	 * specified twice, the from/two addresses will be the same.
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	 */
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	if (cmdp->addr1.lno == cmdp->addr2.lno)
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		++cmdp->addr2.lno;
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	clen = tlen = 0;
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        for (first = 1,
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	    from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
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		/*
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		 * Get next line.  Historic versions of vi allowed "10J" while
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		 * less than 10 lines from the end-of-file, so we do too.
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		 */
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		if (db_get(sp, from, 0, &p, &len)) {
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			cmdp->addr2.lno = from - 1;
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			break;
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		}
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		/* Empty lines just go away. */
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		if (len == 0)
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			continue;
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		/*
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		 * Get more space if necessary.  Note, tlen isn't the length
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		 * of the new line, it's roughly the amount of space needed.
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		 * tbp - bp is the length of the new line.
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		 */
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		tlen += len + 2;
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		ADD_SPACE_RET(sp, bp, blen, tlen);
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		tbp = bp + clen;
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		/*
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		 * Historic practice:
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		 *
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		 * If force specified, join without modification.
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		 * If the current line ends with whitespace, strip leading
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		 *    whitespace from the joined line.
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		 * If the next line starts with a ), do nothing.
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		 * If the current line ends with ., insert two spaces.
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		 * Else, insert one space.
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		 *
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		 * One change -- add ? and ! to the list of characters for
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		 * which we insert two spaces.  I expect that POSIX 1003.2
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		 * will require this as well.
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		 *
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		 * Echar is the last character in the last line joined.
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		 */
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		extra = 0;
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		if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
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			if (isblank(echar))
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				for (; len && isblank(*p); --len, ++p);
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			else if (p[0] != ')') {
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				if (strchr(".?!", echar)) {
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					*tbp++ = ' ';
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					++clen;
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					extra = 1;
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				}
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				*tbp++ = ' ';
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				++clen;
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				for (; len && isblank(*p); --len, ++p);
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			}
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		}
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		if (len != 0) {
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			memcpy(tbp, p, len);
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			tbp += len;
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			clen += len;
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			echar = p[len - 1];
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		} else
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			echar = ' ';
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		/*
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		 * Historic practice for vi was to put the cursor at the first
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		 * inserted whitespace character, if there was one, or the
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		 * first character of the joined line, if there wasn't, or the
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		 * last character of the line if joined to an empty line.  If
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		 * a count was specified, the cursor was moved as described
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		 * for the first line joined, ignoring subsequent lines.  If
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		 * the join was a ':' command, the cursor was placed at the
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		 * first non-blank character of the line unless the cursor was
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		 * "attracted" to the end of line when the command was executed
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		 * in which case it moved to the new end of line.  There are
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		 * probably several more special cases, but frankly, my dear,
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		 * I don't give a damn.  This implementation puts the cursor
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		 * on the first inserted whitespace character, the first
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		 * character of the joined line, or the last character of the
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		 * line regardless.  Note, if the cursor isn't on the joined
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		 * line (possible with : commands), it is reset to the starting
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		 * line.
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		 */
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		if (first) {
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			sp->cno = (tbp - bp) - (1 + extra);
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			first = 0;
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		} else
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			sp->cno = (tbp - bp) - len - (1 + extra);
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	}
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	sp->lno = cmdp->addr1.lno;
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	/* Delete the joined lines. */
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        for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
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		if (db_delete(sp, to))
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			goto err;
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	/* If the original line changed, reset it. */
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	if (!first && db_set(sp, from, bp, tbp - bp)) {
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err:		FREE_SPACE(sp, bp, blen);
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		return (1);
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	}
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	FREE_SPACE(sp, bp, blen);
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	sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
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	return (0);
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}