/*-
 * 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"
#include "pathnames.h"

/*
 * ex_mkexrc -- :mkexrc[!] [file]
 *
 * Create (or overwrite) a .exrc file with the current info.
 *
 * PUBLIC: int ex_mkexrc(SCR *, EXCMD *);
 */
int
ex_mkexrc(SCR *sp, EXCMD *cmdp)
{
	struct stat sb;
	FILE *fp;
	int fd, sverrno;
	char *fname;
	size_t flen;

	switch (cmdp->argc) {
	case 0:
		fname = _PATH_EXRC;
		break;
	case 1:
		INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1, 
			    fname, flen);
		set_alt_name(sp, fname);
		break;
	default:
		abort();
	}

	if (!FL_ISSET(cmdp->iflags, E_C_FORCE) && !stat(fname, &sb)) {
		msgq_str(sp, M_ERR, fname,
		    "137|%s exists, not written; use ! to override");
		return (1);
	}

	/* Create with max permissions of rw-r--r--. */
	if ((fd = open(fname, O_CREAT | O_TRUNC | O_WRONLY,
	    S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)) < 0) {
		msgq_str(sp, M_SYSERR, fname, "%s");
		return (1);
	}

	if ((fp = fdopen(fd, "w")) == NULL) {
		sverrno = errno;
		(void)close(fd);
		goto e2;
	}

	if (seq_save(sp, fp, "abbreviate ", SEQ_ABBREV) || ferror(fp))
		goto e1;
	if (seq_save(sp, fp, "map ", SEQ_COMMAND) || ferror(fp))
		goto e1;
	if (seq_save(sp, fp, "map! ", SEQ_INPUT) || ferror(fp))
		goto e1;
	if (opts_save(sp, fp) || ferror(fp))
		goto e1;
	if (fclose(fp)) {
		sverrno = errno;
		goto e2;
	}

	msgq_str(sp, M_INFO, fname, "138|New exrc file: %s");
	return (0);

e1:	sverrno = errno;
	(void)fclose(fp);
e2:	errno = sverrno;
	msgq_str(sp, M_SYSERR, fname, "%s");
	return (1);
}