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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ex_source.c,v 1.7 2009/10/27 23:59:47 deraadt Exp $	*/

/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

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

#include <bitstring.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../common/common.h"

/*
 * ex_source -- :source file
 *	Execute ex commands from a file.
 *
 * PUBLIC: int ex_source(SCR *, EXCMD *);
 */
int
ex_source(sp, cmdp)
	SCR *sp;
	EXCMD *cmdp;
{
	struct stat sb;
	int fd, len;
	char *bp, *name;

	name = cmdp->argv[0]->bp;
	if ((fd = open(name, O_RDONLY, 0)) < 0 || fstat(fd, &sb))
		goto err;

	/*
	 * XXX
	 * I'd like to test to see if the file is too large to malloc.  Since
	 * we don't know what size or type off_t's or size_t's are, what the
	 * largest unsigned integral type is, or what random insanity the local
	 * C compiler will perpetrate, doing the comparison in a portable way
	 * is flatly impossible.  So, put an fairly unreasonable limit on it,
	 * I don't want to be dropping core here.
	 */
#define	MEGABYTE	1048576
	if (sb.st_size > MEGABYTE) {
		errno = ENOMEM;
		goto err;
	}

	MALLOC(sp, bp, char *, (size_t)sb.st_size + 1);
	if (bp == NULL) {
		(void)close(fd);
		return (1);
	}
	bp[sb.st_size] = '\0';

	/* Read the file into memory. */
	len = read(fd, bp, (int)sb.st_size);
	(void)close(fd);
	if (len == -1 || len != sb.st_size) {
		if (len != sb.st_size)
			errno = EIO;
		free(bp);
err:		msgq_str(sp, M_SYSERR, name, "%s");
		return (1);
	}

	/* Put it on the ex queue. */
	return (ex_run_str(sp, name, bp, (size_t)sb.st_size, 1, 1));
}