1 /* $NetBSD: ex_write.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
2 /*-
3 * Copyright (c) 1992, 1993, 1994
4 * The Regents of the University of California. All rights reserved.
5 * Copyright (c) 1992, 1993, 1994, 1995, 1996
6 * Keith Bostic. All rights reserved.
7 *
8 * See the LICENSE file for redistribution information.
9 */
10
11 #include "config.h"
12
13 #include <sys/cdefs.h>
14 #if 0
15 #ifndef lint
16 static const char sccsid[] = "Id: ex_write.c,v 10.38 2001/06/25 15:19:22 skimo Exp (Berkeley) Date: 2001/06/25 15:19:22 ";
17 #endif /* not lint */
18 #else
19 __RCSID("$NetBSD: ex_write.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
20 #endif
21
22 #include <sys/types.h>
23 #include <sys/queue.h>
24 #include <sys/stat.h>
25
26 #include <bitstring.h>
27 #include <ctype.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <limits.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 #include "../common/common.h"
37
38 enum which {WN, WQ, WRITE, XIT};
39 static int exwr __P((SCR *, EXCMD *, enum which));
40
41 /*
42 * ex_wn -- :wn[!] [>>] [file]
43 * Write to a file and switch to the next one.
44 *
45 * PUBLIC: int ex_wn __P((SCR *, EXCMD *));
46 */
47 int
ex_wn(SCR * sp,EXCMD * cmdp)48 ex_wn(SCR *sp, EXCMD *cmdp)
49 {
50 if (exwr(sp, cmdp, WN))
51 return (1);
52 if (file_m3(sp, 0))
53 return (1);
54
55 /* The file name isn't a new file to edit. */
56 cmdp->argc = 0;
57
58 return (ex_next(sp, cmdp));
59 }
60
61 /*
62 * ex_wq -- :wq[!] [>>] [file]
63 * Write to a file and quit.
64 *
65 * PUBLIC: int ex_wq __P((SCR *, EXCMD *));
66 */
67 int
ex_wq(SCR * sp,EXCMD * cmdp)68 ex_wq(SCR *sp, EXCMD *cmdp)
69 {
70 int force;
71
72 if (exwr(sp, cmdp, WQ))
73 return (1);
74 if (file_m3(sp, 0))
75 return (1);
76
77 force = FL_ISSET(cmdp->iflags, E_C_FORCE);
78
79 if (ex_ncheck(sp, force))
80 return (1);
81
82 F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
83 return (0);
84 }
85
86 /*
87 * ex_write -- :write[!] [>>] [file]
88 * :write [!] [cmd]
89 * Write to a file.
90 *
91 * PUBLIC: int ex_write __P((SCR *, EXCMD *));
92 */
93 int
ex_write(SCR * sp,EXCMD * cmdp)94 ex_write(SCR *sp, EXCMD *cmdp)
95 {
96 return (exwr(sp, cmdp, WRITE));
97 }
98
99
100 /*
101 * ex_xit -- :x[it]! [file]
102 * Write out any modifications and quit.
103 *
104 * PUBLIC: int ex_xit __P((SCR *, EXCMD *));
105 */
106 int
ex_xit(SCR * sp,EXCMD * cmdp)107 ex_xit(SCR *sp, EXCMD *cmdp)
108 {
109 int force;
110
111 NEEDFILE(sp, cmdp);
112
113 if (F_ISSET(sp->ep, F_MODIFIED) && exwr(sp, cmdp, XIT))
114 return (1);
115 if (file_m3(sp, 0))
116 return (1);
117
118 force = FL_ISSET(cmdp->iflags, E_C_FORCE);
119
120 if (ex_ncheck(sp, force))
121 return (1);
122
123 F_SET(sp, force ? SC_EXIT_FORCE : SC_EXIT);
124 return (0);
125 }
126
127 /*
128 * exwr --
129 * The guts of the ex write commands.
130 */
131 static int
exwr(SCR * sp,EXCMD * cmdp,enum which cmd)132 exwr(SCR *sp, EXCMD *cmdp, enum which cmd)
133 {
134 MARK rm;
135 int flags;
136 char *name;
137 CHAR_T *p = NULL;
138 size_t nlen;
139 const char *n;
140 int rc;
141 EX_PRIVATE *exp;
142
143 NEEDFILE(sp, cmdp);
144
145 /* All write commands can have an associated '!'. */
146 LF_INIT(FS_POSSIBLE);
147 if (FL_ISSET(cmdp->iflags, E_C_FORCE))
148 LF_SET(FS_FORCE);
149
150 /* Skip any leading whitespace. */
151 if (cmdp->argc != 0)
152 for (p = cmdp->argv[0]->bp; *p != '\0' && ISBLANK((UCHAR_T)*p); ++p);
153
154 /* If "write !" it's a pipe to a utility. */
155 if (cmdp->argc != 0 && cmd == WRITE && *p == '!') {
156 /* Secure means no shell access. */
157 if (O_ISSET(sp, O_SECURE)) {
158 ex_wemsg(sp, cmdp->cmd->name, EXM_SECURE_F);
159 return (1);
160 }
161
162 /* Expand the argument. */
163 for (++p; *p && ISBLANK((UCHAR_T)*p); ++p);
164 if (*p == '\0') {
165 ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
166 return (1);
167 }
168 if (argv_exp1(sp, cmdp, p, STRLEN(p), 1))
169 return (1);
170
171 /* Set the last bang command */
172 exp = EXP(sp);
173 free(exp->lastbcomm);
174 exp->lastbcomm = v_wstrdup(sp, cmdp->argv[1]->bp,
175 cmdp->argv[1]->len);
176
177 /*
178 * Historically, vi waited after a write filter even if there
179 * wasn't any output from the command. People complained when
180 * nvi waited only if there was output, wanting the visual cue
181 * that the program hadn't written anything.
182 */
183 F_SET(sp, SC_EX_WAIT_YES);
184
185 /*
186 * !!!
187 * Ignore the return cursor position, the cursor doesn't
188 * move.
189 */
190 if (ex_filter(sp, cmdp, &cmdp->addr1,
191 &cmdp->addr2, &rm, cmdp->argv[1]->bp, FILTER_WRITE))
192 return (1);
193
194 /* Ex terminates with a bang, even if the command fails. */
195 if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
196 (void)ex_puts(sp, "!\n");
197
198 return (0);
199 }
200
201 /* Set the FS_ALL flag if we're writing the entire file. */
202 if (cmdp->addr1.lno <= 1 && !db_exist(sp, cmdp->addr2.lno + 1))
203 LF_SET(FS_ALL);
204
205 /* If "write >>" it's an append to a file. */
206 if (cmdp->argc != 0 && cmd != XIT && p[0] == '>' && p[1] == '>') {
207 LF_SET(FS_APPEND);
208
209 /* Skip ">>" and whitespace. */
210 for (p += 2; *p && ISBLANK((UCHAR_T)*p); ++p);
211 }
212
213 /* If no other arguments, just write the file back. */
214 if (cmdp->argc == 0 || *p == '\0')
215 return (file_write(sp,
216 &cmdp->addr1, &cmdp->addr2, NULL, flags));
217
218 /* Build an argv so we get an argument count and file expansion. */
219 if (argv_exp2(sp, cmdp, p, STRLEN(p)))
220 return (1);
221
222 /*
223 * 0 args: impossible.
224 * 1 args: impossible (I hope).
225 * 2 args: read it.
226 * >2 args: object, too many args.
227 *
228 * The 1 args case depends on the argv_sexp() function refusing
229 * to return success without at least one non-blank character.
230 */
231 switch (cmdp->argc) {
232 case 0:
233 case 1:
234 abort();
235 /* NOTREACHED */
236 case 2:
237 INT2CHAR(sp, cmdp->argv[1]->bp, cmdp->argv[1]->len+1,
238 n, nlen);
239 name = v_strdup(sp, n, nlen - 1);
240
241 /*
242 * !!!
243 * Historically, the read and write commands renamed
244 * "unnamed" files, or, if the file had a name, set
245 * the alternate file name.
246 */
247 if (F_ISSET(sp->frp, FR_TMPFILE) &&
248 !F_ISSET(sp->frp, FR_EXNAMED)) {
249 char *q;
250 if ((q = v_strdup(sp, name, nlen - 1)) != NULL) {
251 free(sp->frp->name);
252 sp->frp->name = q;
253 }
254 /*
255 * The file has a real name, it's no longer a
256 * temporary, clear the temporary file flags.
257 *
258 * !!!
259 * If we're writing the whole file, FR_NAMECHANGE
260 * will be cleared by the write routine -- this is
261 * historic practice.
262 */
263 F_CLR(sp->frp, FR_TMPEXIT | FR_TMPFILE);
264 F_SET(sp->frp, FR_NAMECHANGE | FR_EXNAMED);
265
266 /* Notify the screen. */
267 (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
268 } else
269 set_alt_name(sp, name);
270 break;
271 default:
272 INT2CHAR(sp, p, STRLEN(p) + 1, n, nlen);
273 ex_emsg(sp, n, EXM_FILECOUNT);
274 return (1);
275 }
276
277 rc = file_write(sp, &cmdp->addr1, &cmdp->addr2, name, flags);
278
279 free(name);
280
281 return rc;
282 }
283
284 /*
285 * ex_writefp --
286 * Write a range of lines to a FILE *.
287 *
288 * PUBLIC: int ex_writefp __P((SCR *,
289 * PUBLIC: const char *, FILE *, MARK *, MARK *, u_long *, u_long *, int));
290 */
291 int
ex_writefp(SCR * sp,const char * name,FILE * fp,MARK * fm,MARK * tm,u_long * nlno,u_long * nch,int silent)292 ex_writefp(SCR *sp, const char *name, FILE *fp, MARK *fm, MARK *tm, u_long *nlno, u_long *nch, int silent)
293 {
294 struct stat sb;
295 GS *gp;
296 u_long ccnt; /* XXX: can't print off_t portably. */
297 db_recno_t fline, tline, lcnt;
298 size_t len;
299 int rval;
300 const char *msg;
301 CHAR_T *p;
302 const char *f;
303 size_t flen;
304
305 gp = sp->gp;
306 fline = fm->lno;
307 tline = tm->lno;
308
309 if (nlno != NULL) {
310 *nch = 0;
311 *nlno = 0;
312 }
313
314 /*
315 * The vi filter code has multiple processes running simultaneously,
316 * and one of them calls ex_writefp(). The "unsafe" function calls
317 * in this code are to db_get() and msgq(). Db_get() is safe, see
318 * the comment in ex_filter.c:ex_filter() for details. We don't call
319 * msgq if the multiple process bit in the EXF is set.
320 *
321 * !!!
322 * Historic vi permitted files of 0 length to be written. However,
323 * since the way vi got around dealing with "empty" files was to
324 * always have a line in the file no matter what, it wrote them as
325 * files of a single, empty line. We write empty files.
326 *
327 * "Alex, I'll take vi trivia for $1000."
328 */
329 ccnt = 0;
330 lcnt = 0;
331 msg = "253|Writing...";
332 if (tline != 0)
333 for (; fline <= tline; ++fline, ++lcnt) {
334 /* Caller has to provide any interrupt message. */
335 if ((lcnt + 1) % INTERRUPT_CHECK == 0) {
336 if (INTERRUPTED(sp))
337 break;
338 if (!silent) {
339 gp->scr_busy(sp, msg, msg == NULL ?
340 BUSY_UPDATE : BUSY_ON);
341 msg = NULL;
342 }
343 }
344 if (db_get(sp, fline, DBG_FATAL, &p, &len))
345 goto err;
346 INT2FILE(sp, p, len, f, flen);
347 if (fwrite(f, 1, flen, fp) != flen)
348 goto err;
349 ccnt += len;
350 if (putc('\n', fp) != '\n')
351 break;
352 ++ccnt;
353 }
354
355 if (fflush(fp))
356 goto err;
357 /*
358 * XXX
359 * I don't trust NFS -- check to make sure that we're talking to
360 * a regular file and sync so that NFS is forced to flush.
361 */
362 if (!fstat(fileno(fp), &sb) &&
363 S_ISREG(sb.st_mode) && fsync(fileno(fp)))
364 goto err;
365
366 if (fclose(fp))
367 goto err;
368
369 rval = 0;
370 if (0) {
371 err: if (!F_ISSET(sp->ep, F_MULTILOCK))
372 msgq_str(sp, M_SYSERR, name, "%s");
373 (void)fclose(fp);
374 rval = 1;
375 }
376
377 if (!silent)
378 gp->scr_busy(sp, NULL, BUSY_OFF);
379
380 /* Report the possibly partial transfer. */
381 if (nlno != NULL) {
382 *nch = ccnt;
383 *nlno = lcnt;
384 }
385 return (rval);
386 }
387