OpenBSD-4.6/usr.bin/vi/ex/ex_write.c
/* $OpenBSD: ex_write.c,v 1.10 2007/03/20 03:56:13 tedu 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"
#ifndef lint
static const char sccsid[] = "@(#)ex_write.c 10.30 (Berkeley) 7/12/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <bitstring.h>
#include <ctype.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"
enum which {WN, WQ, WRITE, XIT};
static int exwr(SCR *, EXCMD *, enum which);
/*
* ex_wn -- :wn[!] [>>] [file]
* Write to a file and switch to the next one.
*
* PUBLIC: int ex_wn(SCR *, EXCMD *);
*/
int
ex_wn(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
if (exwr(sp, cmdp, WN))
return (1);
if (file_m3(sp, 0))
return (1);
/* The file name isn't a new file to edit. */
cmdp->argc = 0;
return (ex_next(sp, cmdp));
}
/*
* ex_wq -- :wq[!] [>>] [file]
* Write to a file and quit.
*
* PUBLIC: int ex_wq(SCR *, EXCMD *);
*/
int
ex_wq(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
int force;
if (exwr(sp, cmdp, WQ))
return (1);
if (file_m3(sp, 0))
return (1);
force = FL_ISSET(cmdp->iflags, E_C_FORCE);
if (ex_ncheck(sp, force))
return (1);
F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
return (0);
}
/*
* ex_write -- :write[!] [>>] [file]
* :write [!] [cmd]
* Write to a file.
*
* PUBLIC: int ex_write(SCR *, EXCMD *);
*/
int
ex_write(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
return (exwr(sp, cmdp, WRITE));
}
/*
* ex_xit -- :x[it]! [file]
* Write out any modifications and quit.
*
* PUBLIC: int ex_xit(SCR *, EXCMD *);
*/
int
ex_xit(sp, cmdp)
SCR *sp;
EXCMD *cmdp;
{
int force;
NEEDFILE(sp, cmdp);
if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
return (1);
if (file_m3(sp, 0))
return (1);
force = FL_ISSET(cmdp->iflags, E_C_FORCE);
if (ex_ncheck(sp, force))
return (1);
F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
return (0);
}
/*
* exwr --
* The guts of the ex write commands.
*/
static int
exwr(sp, cmdp, cmd)
SCR *sp;
EXCMD *cmdp;
enum which cmd;
{
MARK rm;
int flags;
char *name, *p = NULL;
NEEDFILE(sp, cmdp);
/* All write commands can have an associated '!'. */
LF_INIT(FS_POSSIBLE);
if (FL_ISSET(cmdp->iflags, E_C_FORCE))
LF_SET(FS_FORCE);
/* Skip any leading whitespace. */
if (cmdp->argc != 0)
for (p = cmdp->argv[0]->bp; isblank(*p); ++p)
;
/* If "write !" it's a pipe to a utility. */
if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
/* Secure means no shell access. */
if (O_ISSET(sp, O_SECURE)) {
ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
return (1);
}
/* Expand the argument. */
for (++p; isblank(*p); ++p);
if (*p == '\0') {
ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
return (1);
}
if (argv_exp1(sp, cmdp, p, strlen(p), 1))
return (1);
/*
* Historically, vi waited after a write filter even if there
* wasn't any output from the command. People complained when
* nvi waited only if there was output, wanting the visual cue
* that the program hadn't written anything.
*/
F_SET(sp, SC_EX_WAIT_YES);
/*
* !!!
* Ignore the return cursor position, the cursor doesn't
* move.
*/
if (ex_filter(sp, cmdp, &cmdp->addr1,
&cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
return (1);
/* Ex terminates with a bang, even if the command fails. */
if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
(void)ex_puts(sp, "!\n");
return (0);
}
/* Set the FS_ALL flag if we're writing the entire file. */
if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
LF_SET(FS_ALL);
/* If "write >>" it's an append to a file. */
if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
LF_SET(FS_APPEND);
/* Skip ">>" and whitespace. */
for (p += 2; isblank(*p); ++p);
}
/* If no other arguments, just write the file back. */
if (cmdp->argc == 0 || *p == '\0')
return (file_write(sp,
&cmdp->addr1, &cmdp->addr2, NULL, flags));
/* Build an argv so we get an argument count and file expansion. */
if (argv_exp2(sp, cmdp, p, strlen(p)))
return (1);
/*
* 0 args: impossible.
* 1 args: impossible (I hope).
* 2 args: read it.
* >2 args: object, too many args.
*
* The 1 args case depends on the argv_sexp() function refusing
* to return success without at least one non-blank character.
*/
switch (cmdp->argc) {
case 0:
case 1:
abort();
/* NOTREACHED */
case 2:
name = cmdp->argv[1]->bp;
/*
* !!!
* Historically, the read and write commands renamed
* "unnamed" files, or, if the file had a name, set
* the alternate file name.
*/
if (F_ISSET(sp->frp, FR_TMPFILE) &&
!F_ISSET(sp->frp, FR_EXNAMED)) {
if ((p = v_strdup(sp,
cmdp->argv[1]->bp, cmdp->argv[1]->len)) != NULL) {
free(sp->frp->name);
sp->frp->name = p;
}
/*
* The file has a real name, it's no longer a
* temporary, clear the temporary file flags.
*
* !!!
* If we're writing the whole file, FR_NAMECHANGE
* will be cleared by the write routine -- this is
* historic practice.
*/
F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
/* Notify the screen. */
(void)sp->gp->scr_rename(sp, sp->frp->name, 1);
} else
set_alt_name(sp, name);
break;
default:
ex_emsg(sp, p, EXM_FILECOUNT);
return (1);
}
return (file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags));
}
/*
* ex_writefp --
* Write a range of lines to a FILE *.
*
* PUBLIC: int ex_writefp(SCR *,
* PUBLIC: char *, FILE *, MARK *, MARK *, u_long *, u_long *, int);
*/
int
ex_writefp(sp, name, fp, fm, tm, nlno, nch, silent)
SCR *sp;
char *name;
FILE *fp;
MARK *fm, *tm;
u_long *nlno, *nch;
int silent;
{
struct stat sb;
GS *gp;
u_long ccnt; /* XXX: can't print off_t portably. */
recno_t fline, tline, lcnt;
size_t len;
int rval;
char *msg, *p;
gp = sp->gp;
fline = fm->lno;
tline = tm->lno;
if (nlno != NULL) {
*nch = 0;
*nlno = 0;
}
/*
* The vi filter code has multiple processes running simultaneously,
* and one of them calls ex_writefp(). The "unsafe" function calls
* in this code are to db_get() and msgq(). Db_get() is safe, see
* the comment in ex_filter.c:ex_filter() for details. We don't call
* msgq if the multiple process bit in the EXF is set.
*
* !!!
* 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. We write empty files.
*
* "Alex, I'll take vi trivia for $1000."
*/
ccnt = 0;
lcnt = 0;
msg = "253|Writing...";
if (tline != 0)
for (; fline <= tline; ++fline, ++lcnt) {
/* Caller has to provide any interrupt message. */
if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
if (INTERRUPTED(sp))
break;
if (!silent) {
gp->scr_busy(sp, msg, msg == NULL ?
BUSY_UPDATE : BUSY_ON);
msg = NULL;
}
}
if (db_get(sp, fline, DBG_FATAL, &p, &len))
goto err;
if (fwrite(p, 1, len, fp) != len)
goto err;
ccnt += len;
if (putc('\n', fp) != '\n')
break;
++ccnt;
}
if (fflush(fp))
goto err;
/*
* XXX
* I don't trust NFS -- check to make sure that we're talking to
* a regular file and sync so that NFS is forced to flush.
*/
if (!fstat(fileno(fp), &sb) &&
S_ISREG(sb.st_mode) && fsync(fileno(fp)))
goto err;
if (fclose(fp)) {
fp = NULL;
goto err;
}
rval = 0;
if (0) {
err: if (!F_ISSET(sp->ep, F_MULTILOCK))
msgq_str(sp, M_SYSERR, name, "%s");
if (fp != NULL)
(void)fclose(fp);
rval = 1;
}
if (!silent)
gp->scr_busy(sp, NULL, BUSY_OFF);
/* Report the possibly partial transfer. */
if (nlno != NULL) {
*nch = ccnt;
*nlno = lcnt;
}
return (rval);
}