4.4BSD/usr/src/contrib/nvi/nvi/ex/ex_read.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_read.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 <stdlib.h>
#include <string.h>

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

/*
 * ex_read --	:read[!] [file]
 *		:read [! cmd]
 *	Read from a file or utility.
 */
int
ex_read(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	register char *p;
	struct stat sb;
	FILE *fp;
	MARK rm;
	int force;
	char *fname;

	/* If nothing, just read the file. */
	if ((p = cmdp->string) == NULL) {
		if (F_ISSET(ep, F_NONAME)) {
			msgq(sp, M_ERR, "No filename from which to read.");
			return (1);
		}
		fname = ep->name;
		force = 0;
		goto noargs;
	}

	/* If "read!" it's a force from a file. */
	if (*p == '!') {
		force = 1;
		++p;
	} else
		force = 0;

	/* Skip whitespace. */
	for (; *p && isspace(*p); ++p);

	/* If "read !" it's a pipe from a utility. */
	if (*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, NULL, &rm, ++p, NOINPUT))
			return (1);
		sp->lno = rm.lno;
		return (0);
	}

	/* Build an argv. */
	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);
	}

	/* Open the file. */
noargs:	if ((fp = fopen(fname, "r")) == NULL || fstat(fileno(fp), &sb)) {
		msgq(sp, M_ERR, "%s: %s", fname, strerror(errno));
		return (1);
	}

	/* If not a regular file, force must be set. */
	if (!force && !S_ISREG(sb.st_mode)) {
		msgq(sp, M_ERR,
		    "%s is not a regular file -- use ! to read it.", fname);
		return (1);
	}

	if (ex_readfp(sp, ep, fname, fp, &cmdp->addr1, &sp->rptlines[L_READ]))
		return (1);

	/* Set the cursor. */
	sp->lno = cmdp->addr1.lno + 1;
	
	/* Set autoprint. */
	F_SET(sp, S_AUTOPRINT);

	return (0);
}

/*
 * ex_readfp --
 *	Read lines into the file.
 */
int
ex_readfp(sp, ep, fname, fp, fm, cntp)
	SCR *sp;
	EXF *ep;
	char *fname;
	FILE *fp;
	MARK *fm;
	recno_t *cntp;
{
	size_t len;
	recno_t lno;
	int rval;

	/*
	 * There is one very nasty special case.  The historic vi code displays
	 * a single space (or a '$' if the list option is set) for the first
	 * line in an "empty" file.  If we "insert" a line, that line gets
	 * scrolled down, not repainted, so it's incorrect when we refresh the
	 * the screen.  This is really hard to find and fix in the vi code --
	 * the text input functions detect it explicitly and don't insert a new
	 * line.  The hack here is to repaint the screen if we're appending to
	 * an empty file.
	 */
	if (file_lline(sp, ep, &lno))
		return (1);
	if (lno == 0)
		F_SET(sp, S_REDRAW);

	/*
	 * Add in the lines from the output.  Insertion starts at the line
	 * following the address.
	 */
	rval = 0;
	for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno)
		if (file_aline(sp, ep, 1, lno, sp->ibp, len)) {
			rval = 1;
			break;
		}

	if (ferror(fp)) {
		msgq(sp, M_ERR, "%s: %s", fname, strerror(errno));
		rval = 1;
	}

	if (fclose(fp)) {
		msgq(sp, M_ERR, "%s: %s", fname, strerror(errno));
		return (1);
	}

	if (rval)
		return (1);

	/* Return the number of lines read in. */
	if (cntp != NULL)
		*cntp += lno - fm->lno;

	return (0);
}