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BSD 4_4_Lite2 release
[unix-history] / usr / src / contrib / nvi.1.43 / ex / ex_read.c
/*-
* Copyright (c) 1992, 1993, 1994
* 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 9.5 (Berkeley) 12/1/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
/*
* ex_read -- :read [file]
* :read [!cmd]
* Read from a file or utility.
*
* !!!
* Historical vi wouldn't undo a filter read, for no apparent reason.
*/
int
ex_read(sp, cmdp)
SCR *sp;
EXCMDARG *cmdp;
{
enum { R_ARG, R_EXPANDARG, R_FILTER } which;
struct stat sb;
CHAR_T *arg, *name;
EX_PRIVATE *exp;
FILE *fp;
FREF *frp;
MARK rm;
recno_t nlines;
size_t arglen, blen, len;
int argc, btear, nf, rval;
char *p;
/*
* 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;
} 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)
goto usage;
argc = cmdp->argc - 1;
/* Set the last bang command. */
exp = EXP(sp);
if (exp->lastbcomm != NULL)
free(exp->lastbcomm);
if ((exp->lastbcomm =
strdup(cmdp->argv[argc]->bp)) == NULL) {
msgq(sp, M_SYSERR, NULL);
return (1);
}
/* Redisplay the user's argument if it's changed. */
if (F_ISSET(cmdp, E_MODIFY) && IN_VI_MODE(sp)) {
len = cmdp->argv[argc]->len;
GET_SPACE_RET(sp, p, blen, len + 2);
p[0] = '!';
memmove(p + 1,
cmdp->argv[argc]->bp, cmdp->argv[argc]->len + 1);
(void)sp->s_busy(sp, p);
FREE_SPACE(sp, p, blen);
}
if (filtercmd(sp, &cmdp->addr1,
NULL, &rm, cmdp->argv[argc]->bp, FILTER_READ))
return (1);
/* The filter version of read set the autoprint flag. */
F_SET(EXP(sp), EX_AUTOPRINT);
/* If in vi mode, move to the first nonblank. */
sp->lno = rm.lno;
if (IN_VI_MODE(sp)) {
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);
/*
* 0/1 args: impossible.
* 2 args: read it.
* >2 args: object, too many args.
*/
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.
* The read-only flag follows the file name,
* clear it as well.
*/
F_CLR(sp->frp,
FR_RDONLY | FR_TMPEXIT | FR_TMPFILE);
F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
} else
set_alt_name(sp, name);
break;
default:
p = msg_print(sp, cmdp->argv[0]->bp, &nf);
msgq(sp, M_ERR,
"149|%s expanded into too many file names", p);
if (nf)
FREE_SPACE(sp, p, 0);
usage: ex_message(sp, cmdp->cmd, EXM_USAGE);
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.
*/
if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) {
p = msg_print(sp, name, &nf);
msgq(sp, M_SYSERR, "%s", p);
if (nf)
FREE_SPACE(sp, p, 0);
return (1);
}
if (!S_ISREG(sb.st_mode)) {
(void)fclose(fp);
msgq(sp, M_ERR, "150|Only regular files 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, "264|%s: read lock was unavailable", name);
/* Turn on busy message. */
btear = F_ISSET(sp, S_EXSILENT) ? 0 : !busy_on(sp, "Reading...");
rval = ex_readfp(sp, name, fp, &cmdp->addr1, &nlines, 1);
if (btear)
busy_off(sp);
/*
* 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.)
*/
sp->lno = cmdp->addr1.lno;
if (nlines)
++sp->lno;
return (rval);
}
/*
* ex_readfp --
* Read lines into the file.
*/
int
ex_readfp(sp, name, fp, fm, nlinesp, success_msg)
SCR *sp;
char *name;
FILE *fp;
MARK *fm;
recno_t *nlinesp;
int success_msg;
{
EX_PRIVATE *exp;
recno_t lcnt, lno;
size_t len;
u_long ccnt; /* XXX: can't print off_t portably. */
int nf, rval;
char *p;
rval = 0;
exp = EXP(sp);
/*
* Add in the lines from the output. Insertion starts at the line
* following the address.
*/
ccnt = 0;
lcnt = 0;
for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno, ++lcnt) {
if (INTERRUPTED(sp)) {
if (!success_msg)
ex_message(sp, NULL, EXM_INTERRUPTED);
break;
}
if (file_aline(sp, 1, lno, exp->ibp, len)) {
rval = 1;
break;
}
ccnt += len;
}
if (ferror(fp)) {
p = msg_print(sp, name, &nf);
msgq(sp, M_SYSERR, "%s", p);
if (nf)
FREE_SPACE(sp, p, 0);
rval = 1;
}
if (fclose(fp)) {
p = msg_print(sp, name, &nf);
msgq(sp, M_SYSERR, "%s", p);
if (nf)
FREE_SPACE(sp, p, 0);
return (1);
}
if (rval)
return (1);
/* Return the number of lines read in. */
if (nlinesp != NULL)
*nlinesp = lcnt;
if (success_msg) {
p = msg_print(sp, name, &nf);
if (INTERRUPTED(sp))
msgq(sp, M_INFO,
"151|Interrupted read: %s: %lu lines, %lu characters",
p, lcnt, ccnt);
else
msgq(sp, M_INFO,
"152|%s: %lu lines, %lu characters",
p, lcnt, ccnt);
if (nf)
FREE_SPACE(sp, p, 0);
}
return (0);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.