4.4BSD/usr/src/contrib/nvi/nvi/ex/ex_write.c

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)ex_write.c	8.1 (Berkeley) 6/9/93";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>

#include "vi.h"
#include "excmd.h"

enum which {WQ, WRITE, XIT};

static int exwr __P((SCR *, EXF *, EXCMDARG *, enum which));

/*
 * ex_wq --	:wq[!] [>>] [file]
 *	Write to a file.
 */
int
ex_wq(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	int force;

	force = F_ISSET(cmdp, E_FORCE);

	if (exwr(sp, ep, cmdp, WQ))
		return (1);

	if (!force && ep->refcnt <= 1 && file_next(sp, ep, 0)) {
		msgq(sp, M_ERR,
		    "More files to edit; use \":n\" to go to the next file");
		return (1);
	}

	F_SET(sp, force ? S_EXIT_FORCE : S_EXIT);
	return (0);
}

/*
 * ex_write --	:write[!] [>>] [file]
 *		:write [!] [cmd]
 *	Write to a file.
 */
int
ex_write(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	return (exwr(sp, ep, cmdp, WRITE));
}


/*
 * ex_xit -- :x[it]! [file]
 *
 *	Write out any modifications and quit.
 */
int
ex_xit(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	int force;

	force = F_ISSET(cmdp, E_FORCE);

	if (F_ISSET((ep), F_MODIFIED) && exwr(sp, ep, cmdp, XIT))
		return (1);

	if (!force && ep->refcnt <= 1 && file_next(sp, ep, 0)) {
		msgq(sp, M_ERR,
		    "More files to edit; use \":n\" to go to the next file");
		return (1);
	}

	F_SET(sp, force ? S_EXIT_FORCE : S_EXIT);
	return (0);
}

/*
 * exwr --
 *	The guts of the ex write commands.
 */
static int
exwr(sp, ep, cmdp, cmd)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
	enum which cmd;
{
	register char *p;
	MARK rm;
	int flags;
	char *fname;

	/* All write commands can have an associated '!'. */
	LF_INIT(FS_POSSIBLE);

	p = cmdp->string ? cmdp->string : "";

	/* If "write!" it's a force to a file. */
	if (*p == '!') {
		++p;
		LF_SET(FS_FORCE);
	}

	/* If no more arguments, just write the file back. */
	for (; *p && isspace(*p); ++p);
	if (!*p) {
		if (F_ISSET(cmdp, E_ADDR2_ALL))
			LF_SET(FS_ALL);
		return (file_write(sp, ep,
		    &cmdp->addr1, &cmdp->addr2, NULL, flags));
	}

	/* If "write !" it's a pipe to a utility. */
	if (cmd == WRITE && *p == '!') {
		for (; *p && isspace(*p); ++p);
		if (*p == '\0') {
			msgq(sp, M_ERR, "Usage: %s.", cmdp->cmd->usage);
			return (1);
		}
		if (filtercmd(sp, ep,
		    &cmdp->addr1, &cmdp->addr2, &rm, ++p, NOOUTPUT))
			return (1);
		sp->lno = rm.lno;
		return (0);
	}

	/* If "write >>" it's an append to a file. */
	if (cmd != XIT && p[0] == '>' && p[1] == '>') {
		LF_SET(FS_APPEND);

		/* Skip ">>" and whitespace. */
		for (p += 2; *p && isspace(*p); ++p);
	}

	/* Build an argv (so we get file expansion). */
	if (buildargv(sp, ep, p, 1, &cmdp->argc, &cmdp->argv))
		return (1);

	switch(cmdp->argc) {
	case 0:
		fname = ep->name;
		break;
	case 1:
		fname = (char *)cmdp->argv[0];
		set_altfname(sp, fname);
		break;
	default:
		msgq(sp, M_ERR, "Usage: %s.", cmdp->cmd->usage);
		return (1);
	}

	if (F_ISSET(cmdp, E_ADDR2_ALL))
		LF_SET(FS_ALL);
	return (file_write(sp, ep, &cmdp->addr1, &cmdp->addr2, fname, flags));
}

/*
 * ex_writefp --
 *	Write a range of lines to a FILE *.
 */
int
ex_writefp(sp, ep, fname, fp, fm, tm, success_msg)
	SCR *sp;
	EXF *ep;
	char *fname;
	FILE *fp;
	MARK *fm, *tm;
	int success_msg;
{
	register u_long ccnt, fline, tline;
	recno_t nlines;
	size_t len;
	char *p;

	fline = fm->lno;
	tline = tm->lno;

	ccnt = 0;
	/*
	 * Historic vi permitted files of 0 length to be written.  However,
	 * since the way vi got around dealing with "empty" files was to
	 * always have a line in the file no matter what, it wrote them as
	 * files of a single, empty line.  `Alex, I'll take vi trivia for
	 * $1000.'
	 */
	if (tline != 0)
		for (; fline <= tline; ++fline) {
			if ((p = file_gline(sp, ep, fline, &len)) == NULL)
				break;
			if (fwrite(p, 1, len, fp) != len)
				break;
			ccnt += len;
			if (putc('\n', fp) != '\n')
				break;
			++ccnt;
		}
	if (fclose(fp)) {
		msgq(sp, M_ERR, "%s: %s", fname, strerror(errno));
		return (1);
	}
	if (success_msg) {
		nlines = tm->lno == 0 ? 0 : tm->lno - fm->lno + 1;
		msgq(sp, M_INFO, "%s: %lu line%s, %lu characters.",
		    fname, nlines, nlines == 1 ? "" : "s", ccnt);
	}
	return (0);
}