/*
* exwr --
* The guts of the ex write commands.
*/
static int
exwr(SCR *sp, EXCMD *cmdp, enum which cmd)
{
MARK rm;
int flags;
char *name;
CHAR_T *p = NULL;
size_t nlen;
char *n;
int rc;
EX_PRIVATE *exp;
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; *p != '\0' && cmdskip(*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_wemsg(sp, cmdp->cmd->name, EXM_SECURE_F);
return (1);
}
/* Expand the argument. */
for (++p; *p && cmdskip(*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);
/* Set the last bang command */
exp = EXP(sp);
free(exp->lastbcomm);
exp->lastbcomm = v_wstrdup(sp, cmdp->argv[1]->bp,
cmdp->argv[1]->len);
/*
* 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; *p && cmdskip(*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:
INT2CHAR(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len+1,
n, nlen);
name = v_strdup(sp, n, nlen - 1);
/*
* !!!
* 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 ((n = v_strdup(sp, name, nlen - 1)) != NULL) {
free(sp->frp->name);
sp->frp->name = n;
}
/*
* 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:
INT2CHAR(sp, p, STRLEN(p) + 1, n, nlen);
ex_emsg(sp, n, EXM_FILECOUNT);
return (1);
}
rc = file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags);
free(name);
return rc;
}
/*
* ex_read -- :read [file]
* :read [!cmd]
* Read from a file or utility.
*
* !!!
* Historical vi wouldn't undo a filter read, for no apparent reason.
*
* PUBLIC: int ex_read __P((SCR *, EXCMD *));
*/
int
ex_read(SCR *sp, EXCMD *cmdp)
{
enum { R_ARG, R_EXPANDARG, R_FILTER } which;
struct stat sb;
CHAR_T *arg;
char *name;
size_t nlen;
EX_PRIVATE *exp;
FILE *fp;
FREF *frp;
GS *gp;
MARK rm;
db_recno_t nlines;
size_t arglen;
int argc, rval;
char *p;
char *np;
gp = sp->gp;
/*
* 0 args: read the current pathname.
* 1 args: check for "read !arg".
*/
switch (cmdp->argc) {
case 0:
which = R_ARG;
break;
case 1:
arg = cmdp->argv[0]->bp;
arglen = cmdp->argv[0]->len;
if (*arg == '!') {
++arg;
--arglen;
which = R_FILTER;
/* Secure means no shell access. */
if (O_ISSET(sp, O_SECURE)) {
ex_wemsg(sp, cmdp->cmd->name, EXM_SECURE_F);
return (1);
}
} else
which = R_EXPANDARG;
break;
default:
abort();
/* NOTREACHED */
}
/* Load a temporary file if no file being edited. */
if (sp->ep == NULL) {
if ((frp = file_add(sp, NULL)) == NULL)
return (1);
if (file_init(sp, frp, NULL, 0))
return (1);
}
switch (which) {
case R_FILTER:
/*
* File name and bang expand the user's argument. If
* we don't get an additional argument, it's illegal.
*/
argc = cmdp->argc;
if (argv_exp1(sp, cmdp, arg, arglen, 1))
return (1);
if (argc == cmdp->argc) {
ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
return (1);
}
argc = cmdp->argc - 1;
/* Set the last bang command. */
exp = EXP(sp);
if (exp->lastbcomm != NULL)
free(exp->lastbcomm);
if ((exp->lastbcomm =
v_wstrdup(sp, cmdp->argv[argc]->bp,
cmdp->argv[argc]->len)) == NULL) {
msgq(sp, M_SYSERR, NULL);
return (1);
}
/*
* Vi redisplayed the user's argument if it changed, ex
* always displayed a !, plus the user's argument if it
* changed.
*/
if (F_ISSET(sp, SC_VI)) {
if (F_ISSET(cmdp, E_MODIFY))
(void)vs_update(sp, "!", cmdp->argv[argc]->bp);
} else {
if (F_ISSET(cmdp, E_MODIFY))
(void)ex_printf(sp,
"!%s\n", cmdp->argv[argc]->bp);
else
(void)ex_puts(sp, "!\n");
(void)ex_fflush(sp);
}
/*
* Historically, filter reads as the first ex command didn't
* wait for the user. If SC_SCR_EXWROTE not already set, set
* the don't-wait flag.
*/
if (!F_ISSET(sp, SC_SCR_EXWROTE))
F_SET(sp, SC_EX_WAIT_NO);
/*
* Switch into ex canonical mode. The reason to restore the
* original terminal modes for read filters is so that users
* can do things like ":r! cat /dev/tty".
*
* !!!
* We do not output an extra <newline>, so that we don't touch
* the screen on a normal read.
*/
if (F_ISSET(sp, SC_VI)) {
if (gp->scr_screen(sp, SC_EX)) {
ex_wemsg(sp, cmdp->cmd->name, EXM_NOCANON_F);
return (1);
}
/*
* !!!
* Historically, the read command doesn't switch to
* the alternate X11 xterm screen, if doing a filter
* read -- don't set SA_ALTERNATE.
*/
F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
}
if (ex_filter(sp, cmdp, &cmdp->addr1,
NULL, &rm, cmdp->argv[argc]->bp, FILTER_READ))
return (1);
/* The filter version of read set the autoprint flag. */
F_SET(cmdp, E_AUTOPRINT);
/*
* If in vi mode, move to the first nonblank. Might have
* switched into ex mode, so saved the original SC_VI value.
*/
sp->lno = rm.lno;
if (F_ISSET(sp, SC_VI)) {
sp->cno = 0;
(void)nonblank(sp, sp->lno, &sp->cno);
}
return (0);
case R_ARG:
name = sp->frp->name;
break;
case R_EXPANDARG:
if (argv_exp2(sp, cmdp, arg, arglen))
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:
INT2CHAR(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len + 1,
name, nlen);
/*
* !!!
* 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 = strdup(name)) != 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.
*/
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);
name = sp->frp->name;
} else {
set_alt_name(sp, name);
name = sp->alt_name;
}
break;
default:
ex_wemsg(sp, cmdp->argv[0]->bp, EXM_FILECOUNT);
return (1);
}
break;
}
/*
* !!!
* Historically, vi did not permit reads from non-regular files, nor
* did it distinguish between "read !" and "read!", so there was no
* way to "force" it. We permit reading from named pipes too, since
* they didn't exist when the original implementation of vi was done
* and they seem a reasonable addition.
*/
if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) {
msgq_str(sp, M_SYSERR, name, "%s");
return (1);
}
if (!S_ISFIFO(sb.st_mode) && !S_ISREG(sb.st_mode)) {
(void)fclose(fp);
msgq(sp, M_ERR,
"145|Only regular files and named pipes may be read");
return (1);
}
/* Try and get a lock. */
if (file_lock(sp, NULL, NULL, fileno(fp), 0) == LOCK_UNAVAIL)
msgq(sp, M_ERR, "146|%s: read lock was unavailable", name);
rval = ex_readfp(sp, name, fp, &cmdp->addr1, &nlines, 0);
/*
* In vi, set the cursor to the first line read in, if anything read
* in, otherwise, the address. (Historic vi set it to the line after
* the address regardless, but since that line may not exist we don't
* bother.)
*
* In ex, set the cursor to the last line read in, if anything read in,
* otherwise, the address.
*/
if (F_ISSET(sp, SC_VI)) {
sp->lno = cmdp->addr1.lno;
if (nlines)
++sp->lno;
} else
sp->lno = cmdp->addr1.lno + nlines;
return (rval);
}
/*
* ex_bang -- :[line [,line]] ! command
*
* Pass the rest of the line after the ! character to the program named by
* the O_SHELL option.
*
* Historical vi did NOT do shell expansion on the arguments before passing
* them, only file name expansion. This means that the O_SHELL program got
* "$t" as an argument if that is what the user entered. Also, there's a
* special expansion done for the bang command. Any exclamation points in
* the user's argument are replaced by the last, expanded ! command.
*
* There's some fairly amazing slop in this routine to make the different
* ways of getting here display the right things. It took a long time to
* get it right (wrong?), so be careful.
*
* PUBLIC: int ex_bang(SCR *, EXCMD *);
*/
int
ex_bang(SCR *sp, EXCMD *cmdp)
{
enum filtertype ftype;
ARGS *ap;
EX_PRIVATE *exp;
MARK rm;
recno_t lno;
int rval;
const char *msg;
char *np;
size_t nlen;
ap = cmdp->argv[0];
if (ap->len == 0) {
ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
return (1);
}
/* Set the "last bang command" remembered value. */
exp = EXP(sp);
free(exp->lastbcomm);
if ((exp->lastbcomm = v_wstrdup(sp, ap->bp, ap->len)) == NULL) {
msgq(sp, M_SYSERR, NULL);
return (1);
}
/*
* If the command was modified by the expansion, it was historically
* redisplayed.
*/
if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, SC_EX_SILENT)) {
/*
* Display the command if modified. Historic ex/vi displayed
* the command if it was modified due to file name and/or bang
* expansion. If piping lines in vi, it would be immediately
* overwritten by any error or line change reporting.
*/
if (F_ISSET(sp, SC_VI))
vs_update(sp, "!", ap->bp);
else {
(void)ex_printf(sp, "!"WS"\n", ap->bp);
(void)ex_fflush(sp);
}
}
/*
* If no addresses were specified, run the command. If there's an
* underlying file, it's been modified and autowrite is set, write
* the file back. If the file has been modified, autowrite is not
* set and the warn option is set, tell the user about the file.
*/
if (cmdp->addrcnt == 0) {
msg = NULL;
if (sp->ep != NULL && F_ISSET(sp->ep, F_MODIFIED))
if (O_ISSET(sp, O_AUTOWRITE)) {
if (file_aw(sp, FS_ALL))
return (0);
} else if (O_ISSET(sp, O_WARN) &&
!F_ISSET(sp, SC_EX_SILENT))
msg = msg_cat(sp,
"303|File modified since last write.",
NULL);
/* If we're still in a vi screen, move out explicitly. */
INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
(void)ex_exec_proc(sp,
cmdp, np, msg, !F_ISSET(sp, SC_EX | SC_SCR_EXWROTE));
}
/*
* If addresses were specified, pipe lines from the file through the
* command.
*
* Historically, vi lines were replaced by both the stdout and stderr
* lines of the command, but ex lines by only the stdout lines. This
* makes no sense to me, so nvi makes it consistent for both, and
* matches vi's historic behavior.
*/
else {
NEEDFILE(sp, cmdp);
/* Autoprint is set historically, even if the command fails. */
F_SET(cmdp, E_AUTOPRINT);
/*
* !!!
* Historical vi permitted "!!" in an empty file. When this
* happens, we arrive here with two addresses of 1,1 and a
* bad attitude. The simple solution is to turn it into a
* FILTER_READ operation, with the exception that stdin isn't
* opened for the utility, and the cursor position isn't the
* same. The only historic glitch (I think) is that we don't
* put an empty line into the default cut buffer, as historic
* vi did. Imagine, if you can, my disappointment.
*/
ftype = FILTER_BANG;
if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
if (db_last(sp, &lno))
return (1);
if (lno == 0) {
cmdp->addr1.lno = cmdp->addr2.lno = 0;
ftype = FILTER_RBANG;
}
}
rval = ex_filter(sp, cmdp,
&cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype);
/*
* If in vi mode, move to the first nonblank.
*
* !!!
* Historic vi wasn't consistent in this area -- if you used
* a forward motion it moved to the first nonblank, but if you
* did a backward motion it didn't. And, if you followed a
* backward motion with a forward motion, it wouldn't move to
* the nonblank for either. Going to the nonblank generally
* seems more useful and consistent, so we do it.
*/
sp->lno = rm.lno;
if (F_ISSET(sp, SC_VI)) {
sp->cno = 0;
(void)nonblank(sp, sp->lno, &sp->cno);
} else
sp->cno = rm.cno;
}
/* 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");
/*
* XXX
* The ! commands never return an error, so that autoprint always
* happens in the ex parser.
*/
return (0);
}
