2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid[] = "@(#)ex_read.c 10.38 (Berkeley) 8/12/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
21 #include <bitstring.h>
29 #include "../common/common.h"
33 * ex_read -- :read [file]
35 * Read from a file or utility.
38 * Historical vi wouldn't undo a filter read, for no apparent reason.
40 * PUBLIC: int ex_read __P((SCR *, EXCMD *));
47 enum { R_ARG, R_EXPANDARG, R_FILTER } which;
63 * 0 args: read the current pathname.
64 * 1 args: check for "read !arg".
71 arg = cmdp->argv[0]->bp;
72 arglen = cmdp->argv[0]->len;
78 /* Secure means no shell access. */
79 if (O_ISSET(sp, O_SECURE)) {
80 ex_emsg(sp, cmdp->cmd->name, EXM_SECURE_F);
91 /* Load a temporary file if no file being edited. */
93 if ((frp = file_add(sp, NULL)) == NULL)
95 if (file_init(sp, frp, NULL, 0))
102 * File name and bang expand the user's argument. If
103 * we don't get an additional argument, it's illegal.
106 if (argv_exp1(sp, cmdp, arg, arglen, 1))
108 if (argc == cmdp->argc) {
109 ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
112 argc = cmdp->argc - 1;
114 /* Set the last bang command. */
116 if (exp->lastbcomm != NULL)
117 free(exp->lastbcomm);
118 if ((exp->lastbcomm =
119 strdup(cmdp->argv[argc]->bp)) == NULL) {
120 msgq(sp, M_SYSERR, NULL);
125 * Vi redisplayed the user's argument if it changed, ex
126 * always displayed a !, plus the user's argument if it
129 if (F_ISSET(sp, SC_VI)) {
130 if (F_ISSET(cmdp, E_MODIFY))
131 (void)vs_update(sp, "!", cmdp->argv[argc]->bp);
133 if (F_ISSET(cmdp, E_MODIFY))
135 "!%s\n", cmdp->argv[argc]->bp);
137 (void)ex_puts(sp, "!\n");
142 * Historically, filter reads as the first ex command didn't
143 * wait for the user. If SC_SCR_EXWROTE not already set, set
144 * the don't-wait flag.
146 if (!F_ISSET(sp, SC_SCR_EXWROTE))
147 F_SET(sp, SC_EX_WAIT_NO);
150 * Switch into ex canonical mode. The reason to restore the
151 * original terminal modes for read filters is so that users
152 * can do things like ":r! cat /dev/tty".
155 * We do not output an extra <newline>, so that we don't touch
156 * the screen on a normal read.
158 if (F_ISSET(sp, SC_VI)) {
159 if (gp->scr_screen(sp, SC_EX)) {
160 ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON_F);
165 * Historically, the read command doesn't switch to
166 * the alternate X11 xterm screen, if doing a filter
167 * read -- don't set SA_ALTERNATE.
169 F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
172 if (ex_filter(sp, cmdp, &cmdp->addr1,
173 NULL, &rm, cmdp->argv[argc]->bp, FILTER_READ))
176 /* The filter version of read set the autoprint flag. */
177 F_SET(cmdp, E_AUTOPRINT);
180 * If in vi mode, move to the first nonblank. Might have
181 * switched into ex mode, so saved the original SC_VI value.
184 if (F_ISSET(sp, SC_VI)) {
186 (void)nonblank(sp, sp->lno, &sp->cno);
190 name = sp->frp->name;
193 if (argv_exp2(sp, cmdp, arg, arglen))
196 * 0 args: impossible.
197 * 1 args: impossible (I hope).
199 * >2 args: object, too many args.
201 * The 1 args case depends on the argv_sexp() function refusing
202 * to return success without at least one non-blank character.
204 switch (cmdp->argc) {
210 name = cmdp->argv[1]->bp;
213 * Historically, the read and write commands renamed
214 * "unnamed" files, or, if the file had a name, set
215 * the alternate file name.
217 if (F_ISSET(sp->frp, FR_TMPFILE) &&
218 !F_ISSET(sp->frp, FR_EXNAMED)) {
219 if ((p = v_strdup(sp, cmdp->argv[1]->bp,
220 cmdp->argv[1]->len)) != NULL) {
225 * The file has a real name, it's no longer a
226 * temporary, clear the temporary file flags.
228 F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
229 F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
231 /* Notify the screen. */
232 (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
234 set_alt_name(sp, name);
237 ex_emsg(sp, cmdp->argv[0]->bp, EXM_FILECOUNT);
246 * Historically, vi did not permit reads from non-regular files, nor
247 * did it distinguish between "read !" and "read!", so there was no
248 * way to "force" it. We permit reading from named pipes too, since
249 * they didn't exist when the original implementation of vi was done
250 * and they seem a reasonable addition.
252 if ((fp = fopen(name, "r")) == NULL || fstat(fileno(fp), &sb)) {
253 msgq_str(sp, M_SYSERR, name, "%s");
256 if (!S_ISFIFO(sb.st_mode) && !S_ISREG(sb.st_mode)) {
259 "145|Only regular files and named pipes may be read");
263 /* Try and get a lock. */
264 if (file_lock(sp, NULL, NULL, fileno(fp), 0) == LOCK_UNAVAIL)
265 msgq(sp, M_ERR, "146|%s: read lock was unavailable", name);
267 rval = ex_readfp(sp, name, fp, &cmdp->addr1, &nlines, 0);
270 * In vi, set the cursor to the first line read in, if anything read
271 * in, otherwise, the address. (Historic vi set it to the line after
272 * the address regardless, but since that line may not exist we don't
275 * In ex, set the cursor to the last line read in, if anything read in,
276 * otherwise, the address.
278 if (F_ISSET(sp, SC_VI)) {
279 sp->lno = cmdp->addr1.lno;
283 sp->lno = cmdp->addr1.lno + nlines;
289 * Read lines into the file.
291 * PUBLIC: int ex_readfp __P((SCR *, char *, FILE *, MARK *, recno_t *, int));
294 ex_readfp(sp, name, fp, fm, nlinesp, silent)
306 u_long ccnt; /* XXX: can't print off_t portably. */
314 * Add in the lines from the output. Insertion starts at the line
315 * following the address.
319 p = "147|Reading...";
320 for (lno = fm->lno; !ex_getline(sp, fp, &len); ++lno, ++lcnt) {
321 if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
326 p == NULL ? BUSY_UPDATE : BUSY_ON);
330 if (db_append(sp, 1, lno, exp->ibp, len))
335 if (ferror(fp) || fclose(fp))
338 /* Return the number of lines read in. */
343 p = msg_print(sp, name, &nf);
345 "148|%s: %lu lines, %lu characters", p, lcnt, ccnt);
347 FREE_SPACE(sp, p, 0);
352 err: msgq_str(sp, M_SYSERR, name, "%s");
358 gp->scr_busy(sp, NULL, BUSY_OFF);