1 /*-
2 * Copyright (c) 1980, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)main.c 8.6 (Berkeley) 5/1/95
31 * $FreeBSD: src/sbin/dump/main.c,v 1.20.2.9 2003/01/25 18:54:59 dillon Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/stat.h>
36 #include <sys/time.h>
37 #include <vfs/ufs/dinode.h>
38 #include <vfs/ufs/fs.h>
39
40 #include <protocols/dumprestore.h>
41
42 #include <ctype.h>
43 #include <err.h>
44 #include <fcntl.h>
45 #include <fstab.h>
46 #include <signal.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #include <unistd.h>
51
52 #include "dump.h"
53 #include "pathnames.h"
54
55 int mapsize; /* size of the state maps */
56 char *usedinomap; /* map of allocated inodes */
57 char *dumpdirmap; /* map of directories to be dumped */
58 char *dumpinomap; /* map of files to be dumped */
59
60 #ifndef SBOFF
61 #define SBOFF (SBLOCK * DEV_BSIZE)
62 #endif
63
64 char *disk; /* name of the disk file */
65 const char *tape; /* name of the tape file */
66 int level; /* dump level of this dump */
67 int uflag; /* update flag */
68 int diskfd; /* disk file descriptor */
69 int pipeout; /* true => output to standard output */
70 int density = 0; /* density in bytes/0.1" " <- this is for hilit19 */
71 long tapesize; /* estimated tape size, blocks */
72 long tsize; /* tape size in 0.1" units */
73 int etapes; /* estimated number of tapes */
74 int nonodump; /* if set, do not honor UF_NODUMP user flags */
75 int unlimited; /* if set, write to end of medium */
76 int cachesize = 0; /* block cache size (in bytes) */
77 int notify = 0; /* notify operator flag */
78 int blockswritten = 0; /* number of blocks written on current tape */
79 int tapeno = 0; /* current tape number */
80 int ntrec = NTREC; /* # tape blocks in each tape record */
81 long blocksperfile; /* output blocks per file */
82 int cartridge = 0; /* Assume non-cartridge tape */
83 int dokerberos = 0; /* Use Kerberos authentication */
84 long dev_bsize = 1; /* recalculated below */
85 const char *host; /* remote host (if any) */
86 time_t tstart_writing; /* when started writing the first tape block */
87 time_t tend_writing; /* after writing the last tape block */
88 int passno; /* current dump pass number */
89 struct fs *sblock; /* the file system super block */
90 int dev_bshift; /* log2(dev_bsize) */
91 int tp_bshift; /* log2(TP_BSIZE) */
92 char sblock_buf[MAXBSIZE];
93 static long numarg(const char *, long, long);
94 static void obsolete(int *, char **[]);
95 static void usage(void);
96
97 int
main(int argc,char ** argv)98 main(int argc, char **argv)
99 {
100 struct stat sb;
101 ufs1_ino_t ino;
102 int dirty;
103 struct ufs1_dinode *dp;
104 struct fstab *dt;
105 char *map;
106 int ch;
107 int i, anydirskipped, bflag = 0, Tflag = 0, honorlevel = 1;
108 int just_estimate = 0;
109 ufs1_ino_t maxino;
110
111 spcl.c_date = 0;
112 time((time_t *)&spcl.c_date);
113
114 tsize = 0; /* Default later, based on 'c' option for cart tapes */
115 if ((tape = getenv("TAPE")) == NULL)
116 tape = _PATH_DEFTAPE;
117 dumpdates = _PATH_DUMPDATES;
118 if (TP_BSIZE / DEV_BSIZE == 0 || TP_BSIZE % DEV_BSIZE != 0)
119 quit("TP_BSIZE must be a multiple of DEV_BSIZE\n");
120 level = '0';
121
122 if (argc < 2)
123 usage();
124
125 obsolete(&argc, &argv);
126 #ifdef KERBEROS
127 #define optstring "0123456789aB:b:cd:f:h:kns:ST:uWwD:C:"
128 #else
129 #define optstring "0123456789aB:b:cd:f:h:ns:ST:uWwD:C:"
130 #endif
131 while ((ch = getopt(argc, argv, optstring)) != -1)
132 #undef optstring
133 switch (ch) {
134 /* dump level */
135 case '0': case '1': case '2': case '3': case '4':
136 case '5': case '6': case '7': case '8': case '9':
137 level = ch;
138 break;
139
140 case 'a': /* `auto-size', Write to EOM. */
141 unlimited = 1;
142 break;
143
144 case 'B': /* blocks per output file */
145 blocksperfile = numarg("number of blocks per file",
146 1L, 0L);
147 break;
148
149 case 'b': /* blocks per tape write */
150 ntrec = numarg("number of blocks per write",
151 1L, 1000L);
152 break;
153
154 case 'c': /* Tape is cart. not 9-track */
155 cartridge = 1;
156 break;
157
158 case 'd': /* density, in bits per inch */
159 density = numarg("density", 10L, 327670L) / 10;
160 if (density >= 625 && !bflag)
161 ntrec = HIGHDENSITYTREC;
162 break;
163
164 case 'f': /* output file */
165 tape = optarg;
166 break;
167
168 case 'D':
169 dumpdates = optarg;
170 break;
171
172 case 'C':
173 cachesize = numarg("cachesize", 0, 0) * 1024 * 1024;
174 break;
175
176 case 'h':
177 honorlevel = numarg("honor level", 0L, 10L);
178 break;
179
180 #ifdef KERBEROS
181 case 'k':
182 dokerberos = 1;
183 break;
184 #endif
185
186 case 'n': /* notify operators */
187 notify = 1;
188 break;
189
190 case 's': /* tape size, feet */
191 tsize = numarg("tape size", 1L, 0L) * 12 * 10;
192 break;
193
194 case 'S': /* exit after estimating # of tapes */
195 just_estimate = 1;
196 break;
197
198 case 'T': /* time of last dump */
199 spcl.c_ddate = unctime(optarg);
200 if (spcl.c_ddate < 0) {
201 fprintf(stderr, "bad time \"%s\"\n", optarg);
202 exit(X_STARTUP);
203 }
204 Tflag = 1;
205 lastlevel = '?';
206 break;
207
208 case 'u': /* update /etc/dumpdates */
209 uflag = 1;
210 break;
211
212 case 'W': /* what to do */
213 case 'w':
214 lastdump(ch);
215 exit(X_FINOK); /* do nothing else */
216
217 default:
218 usage();
219 }
220 argc -= optind;
221 argv += optind;
222
223 if (argc < 1) {
224 fprintf(stderr, "Must specify disk or filesystem\n");
225 exit(X_STARTUP);
226 }
227 disk = *argv++;
228 argc--;
229 if (argc >= 1) {
230 fprintf(stderr, "Unknown arguments to dump:");
231 while (argc--)
232 fprintf(stderr, " %s", *argv++);
233 fprintf(stderr, "\n");
234 exit(X_STARTUP);
235 }
236 if (Tflag && uflag) {
237 fprintf(stderr, "You cannot use the T and u flags together.\n");
238 exit(X_STARTUP);
239 }
240 if (strcmp(tape, "-") == 0) {
241 pipeout++;
242 tape = "standard output";
243 }
244
245 if (blocksperfile)
246 blocksperfile = rounddown(blocksperfile, ntrec); /* round down */
247 else if (!unlimited) {
248 /*
249 * Determine how to default tape size and density
250 *
251 * density tape size
252 * 9-track 1600 bpi (160 bytes/.1") 2300 ft.
253 * 9-track 6250 bpi (625 bytes/.1") 2300 ft.
254 * cartridge 8000 bpi (100 bytes/.1") 1700 ft.
255 * (450*4 - slop)
256 * hilit19 hits again: "
257 */
258 if (density == 0)
259 density = cartridge ? 100 : 160;
260 if (tsize == 0)
261 tsize = cartridge ? 1700L*120L : 2300L*120L;
262 }
263
264 if (strchr(tape, ':')) {
265 char *ehost;
266 if ((host = strdup(tape)) == NULL)
267 err(1, "strdup failed");
268 ehost = strchr(host, ':');
269 *ehost++ = '\0';
270 tape = ehost;
271 #ifdef RDUMP
272 if (strchr(tape, '\n')) {
273 fprintf(stderr, "invalid characters in tape\n");
274 exit(X_STARTUP);
275 }
276 if (rmthost(host) == 0)
277 exit(X_STARTUP);
278 #else
279 fprintf(stderr, "remote dump not enabled\n");
280 exit(X_STARTUP);
281 #endif
282 }
283 setuid(getuid()); /* rmthost() is the only reason to be setuid */
284
285 if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
286 signal(SIGHUP, sig);
287 if (signal(SIGTRAP, SIG_IGN) != SIG_IGN)
288 signal(SIGTRAP, sig);
289 if (signal(SIGFPE, SIG_IGN) != SIG_IGN)
290 signal(SIGFPE, sig);
291 if (signal(SIGBUS, SIG_IGN) != SIG_IGN)
292 signal(SIGBUS, sig);
293 if (signal(SIGSEGV, SIG_IGN) != SIG_IGN)
294 signal(SIGSEGV, sig);
295 if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
296 signal(SIGTERM, sig);
297 if (signal(SIGINT, interrupt) == SIG_IGN)
298 signal(SIGINT, SIG_IGN);
299
300 dump_getfstab(); /* /etc/fstab snarfed */
301 /*
302 * disk can be either the full special file name,
303 * the suffix of the special file name,
304 * the special name missing the leading '/',
305 * the file system name with or without the leading '/'.
306 */
307 dt = fstabsearch(disk);
308 if (dt != NULL) {
309 disk = rawname(dt->fs_spec);
310 strncpy(spcl.c_dev, dt->fs_spec, NAMELEN);
311 strncpy(spcl.c_filesys, dt->fs_file, NAMELEN);
312 } else {
313 strncpy(spcl.c_dev, disk, NAMELEN);
314 strncpy(spcl.c_filesys, "an unlisted file system", NAMELEN);
315 }
316 spcl.c_dev[NAMELEN-1]='\0';
317 spcl.c_filesys[NAMELEN-1]='\0';
318 strcpy(spcl.c_label, "none");
319 gethostname(spcl.c_host, NAMELEN);
320 spcl.c_level = level - '0';
321 spcl.c_type = TS_TAPE;
322 if (!Tflag)
323 getdumptime(); /* /etc/dumpdates snarfed */
324
325 msg("Date of this level %c dump: %s", level,
326 spcl.c_date == 0 ? "the epoch\n" : ctime((const time_t *)&spcl.c_date));
327 msg("Date of last level %c dump: %s", lastlevel,
328 spcl.c_ddate == 0 ? "the epoch\n" : ctime((const time_t *)&spcl.c_ddate));
329 msg("Dumping %s ", disk);
330 if (dt != NULL)
331 msgtail("(%s) ", dt->fs_file);
332 if (host)
333 msgtail("to %s on host %s\n", tape, host);
334 else
335 msgtail("to %s\n", tape);
336
337 if ((diskfd = open(disk, O_RDONLY)) < 0)
338 err(X_STARTUP, "Cannot open %s", disk);
339 if (fstat(diskfd, &sb) != 0)
340 err(X_STARTUP, "%s: stat", disk);
341 if (S_ISDIR(sb.st_mode))
342 errx(X_STARTUP, "%s: unknown file system", disk);
343 sync();
344 sblock = (struct fs *)sblock_buf;
345 bread(SBOFF, (char *) sblock, SBSIZE);
346 if (sblock->fs_magic != FS_MAGIC)
347 quit("bad sblock magic number\n");
348 dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1);
349 dev_bshift = ffs(dev_bsize) - 1;
350 if (dev_bsize != (1 << dev_bshift))
351 quit("dev_bsize (%ld) is not a power of 2", dev_bsize);
352 tp_bshift = ffs(TP_BSIZE) - 1;
353 if (TP_BSIZE != (1 << tp_bshift))
354 quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE);
355 #ifdef FS_44INODEFMT
356 if (sblock->fs_inodefmt >= FS_44INODEFMT)
357 spcl.c_flags |= DR_NEWINODEFMT;
358 #endif
359 maxino = sblock->fs_ipg * sblock->fs_ncg;
360 mapsize = roundup(howmany(maxino, NBBY), TP_BSIZE);
361 usedinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
362 dumpdirmap = (char *)calloc((unsigned) mapsize, sizeof(char));
363 dumpinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
364 tapesize = 3 * (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
365
366 nonodump = spcl.c_level < honorlevel;
367
368 passno = 1;
369 setproctitle("%s: pass 1: regular files", disk);
370 msg("mapping (Pass I) [regular files]\n");
371 anydirskipped = mapfiles(maxino, &tapesize);
372
373 passno = 2;
374 setproctitle("%s: pass 2: directories", disk);
375 msg("mapping (Pass II) [directories]\n");
376 while (anydirskipped) {
377 anydirskipped = mapdirs(maxino, &tapesize);
378 }
379
380 if (pipeout || unlimited) {
381 tapesize += 10; /* 10 trailer blocks */
382 msg("estimated %ld tape blocks.\n", tapesize);
383 } else {
384 double fetapes;
385
386 if (blocksperfile)
387 fetapes = (double) tapesize / blocksperfile;
388 else if (cartridge) {
389 /* Estimate number of tapes, assuming streaming stops at
390 the end of each block written, and not in mid-block.
391 Assume no erroneous blocks; this can be compensated
392 for with an artificially low tape size. */
393 fetapes =
394 ( (double) tapesize /* blocks */
395 * TP_BSIZE /* bytes/block */
396 * (1.0/density) /* 0.1" / byte " */
397 +
398 (double) tapesize /* blocks */
399 * (1.0/ntrec) /* streaming-stops per block */
400 * 15.48 /* 0.1" / streaming-stop " */
401 ) * (1.0 / tsize ); /* tape / 0.1" " */
402 } else {
403 /* Estimate number of tapes, for old fashioned 9-track
404 tape */
405 int tenthsperirg = (density == 625) ? 3 : 7;
406 fetapes =
407 ( (double) tapesize /* blocks */
408 * TP_BSIZE /* bytes / block */
409 * (1.0/density) /* 0.1" / byte " */
410 +
411 (double) tapesize /* blocks */
412 * (1.0/ntrec) /* IRG's / block */
413 * tenthsperirg /* 0.1" / IRG " */
414 ) * (1.0 / tsize ); /* tape / 0.1" " */
415 }
416 etapes = fetapes; /* truncating assignment */
417 etapes++;
418 /* count the dumped inodes map on each additional tape */
419 tapesize += (etapes - 1) *
420 (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
421 tapesize += etapes + 10; /* headers + 10 trailer blks */
422 msg("estimated %ld tape blocks on %3.2f tape(s).\n",
423 tapesize, fetapes);
424 }
425
426 /*
427 * If the user only wants an estimate of the number of
428 * tapes, exit now.
429 */
430 if (just_estimate)
431 exit(0);
432
433 /*
434 * Allocate tape buffer.
435 */
436 if (!alloctape())
437 quit(
438 "can't allocate tape buffers - try a smaller blocking factor.\n");
439
440 startnewtape(1);
441 time((time_t *)&(tstart_writing));
442 dumpmap(usedinomap, TS_CLRI, maxino - 1);
443
444 passno = 3;
445 setproctitle("%s: pass 3: directories", disk);
446 msg("dumping (Pass III) [directories]\n");
447 dirty = 0; /* XXX just to get gcc to shut up */
448 for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
449 if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */
450 dirty = *map++;
451 else
452 dirty >>= 1;
453 if ((dirty & 1) == 0)
454 continue;
455 /*
456 * Skip directory inodes deleted and maybe reallocated
457 */
458 dp = getino(ino);
459 if ((dp->di_mode & IFMT) != IFDIR)
460 continue;
461 dumpino(dp, ino);
462 }
463
464 passno = 4;
465 setproctitle("%s: pass 4: regular files", disk);
466 msg("dumping (Pass IV) [regular files]\n");
467 for (map = dumpinomap, ino = 1; ino < maxino; ino++) {
468 int mode;
469
470 if (((ino - 1) % NBBY) == 0) /* map is offset by 1 */
471 dirty = *map++;
472 else
473 dirty >>= 1;
474 if ((dirty & 1) == 0)
475 continue;
476 /*
477 * Skip inodes deleted and reallocated as directories.
478 */
479 dp = getino(ino);
480 mode = dp->di_mode & IFMT;
481 if (mode == IFDIR)
482 continue;
483 dumpino(dp, ino);
484 }
485
486 time(&tend_writing);
487 spcl.c_type = TS_END;
488 for (i = 0; i < ntrec; i++)
489 writeheader(maxino - 1);
490 if (pipeout)
491 msg("DUMP: %ld tape blocks\n", (long)spcl.c_tapea);
492 else
493 msg("DUMP: %ld tape blocks on %d volume%s\n",
494 (long)spcl.c_tapea, spcl.c_volume,
495 (spcl.c_volume == 1) ? "" : "s");
496
497 /* report dump performance, avoid division through zero */
498 if (tend_writing - tstart_writing == 0)
499 msg("finished in less than a second\n");
500 else
501 msg("finished in %ld seconds, throughput %ld KBytes/sec\n",
502 (long)(tend_writing - tstart_writing),
503 spcl.c_tapea / (tend_writing - tstart_writing));
504
505 putdumptime();
506 trewind();
507 broadcast("DUMP IS DONE!\a\a\n");
508 msg("DUMP IS DONE\n");
509 Exit(X_FINOK);
510 /* NOTREACHED */
511 }
512
513 static void
usage(void)514 usage(void)
515 {
516 fprintf(stderr,
517 "usage: dump [-0123456789ac"
518 #ifdef KERBEROS
519 "k"
520 #endif
521 "nSu] [-B records] [-b blocksize] [-D dumpdates]\n"
522 " [-d density] [-f file ] [-h level] [-s feet]\n"
523 " [-T date] [-C cachesizeMB] filesystem\n"
524 " dump [-W | -w]\n");
525 exit(X_STARTUP);
526 }
527
528 /*
529 * Pick up a numeric argument. It must be nonnegative and in the given
530 * range (except that a vmax of 0 means unlimited).
531 */
532 static long
numarg(const char * meaning,long vmin,long vmax)533 numarg(const char *meaning, long vmin, long vmax)
534 {
535 char *p;
536 long val;
537
538 val = strtol(optarg, &p, 10);
539 if (*p)
540 errx(1, "illegal %s -- %s", meaning, optarg);
541 if (val < vmin || (vmax && val > vmax))
542 errx(1, "%s must be between %ld and %ld", meaning, vmin, vmax);
543 return (val);
544 }
545
546 void
sig(int signo)547 sig(int signo)
548 {
549 switch(signo) {
550 case SIGALRM:
551 case SIGBUS:
552 case SIGFPE:
553 case SIGHUP:
554 case SIGTERM:
555 case SIGTRAP:
556 if (pipeout)
557 quit("Signal on pipe: cannot recover\n");
558 msg("Rewriting attempted as response to unknown signal.\n");
559 fflush(stderr);
560 fflush(stdout);
561 close_rewind();
562 exit(X_REWRITE);
563 /* NOTREACHED */
564 case SIGSEGV:
565 msg("SIGSEGV: ABORTING!\n");
566 signal(SIGSEGV, SIG_DFL);
567 kill(0, SIGSEGV);
568 /* NOTREACHED */
569 }
570 }
571
572 char *
rawname(char * cp)573 rawname(char *cp)
574 {
575 static char rawbuf[MAXPATHLEN];
576 char *dp;
577 struct stat sb;
578
579 if (stat(cp, &sb) == 0) {
580 /*
581 * If the name already refers to a raw device, return
582 * it immediately without tampering.
583 */
584 if ((sb.st_mode & S_IFMT) == S_IFCHR)
585 return (cp);
586 }
587
588 dp = strrchr(cp, '/');
589
590 if (dp == NULL)
591 return (NULL);
592 *dp = '\0';
593 strncpy(rawbuf, cp, MAXPATHLEN - 1);
594 rawbuf[MAXPATHLEN-1] = '\0';
595 *dp = '/';
596 strncat(rawbuf, "/r", MAXPATHLEN - 1 - strlen(rawbuf));
597 strncat(rawbuf, dp + 1, MAXPATHLEN - 1 - strlen(rawbuf));
598 return (rawbuf);
599 }
600
601 /*
602 * obsolete --
603 * Change set of key letters and ordered arguments into something
604 * getopt(3) will like.
605 */
606 static void
obsolete(int * argcp,char *** argvp)607 obsolete(int *argcp, char ***argvp)
608 {
609 int argc, flags;
610 char *ap, **argv, *flagsp, **nargv, *p;
611
612 /* Setup. */
613 argv = *argvp;
614 argc = *argcp;
615
616 /* Return if no arguments or first argument has leading dash. */
617 ap = argv[1];
618 if (argc == 1 || *ap == '-')
619 return;
620
621 /* Allocate space for new arguments. */
622 if ((*argvp = nargv = malloc((argc + 1) * sizeof(char *))) == NULL ||
623 (p = flagsp = malloc(strlen(ap) + 2)) == NULL)
624 err(1, NULL);
625
626 *nargv++ = *argv;
627 argv += 2;
628
629 for (flags = 0; *ap; ++ap) {
630 switch (*ap) {
631 case 'B':
632 case 'b':
633 case 'd':
634 case 'f':
635 case 'D':
636 case 'C':
637 case 'h':
638 case 's':
639 case 'T':
640 if (*argv == NULL) {
641 warnx("option requires an argument -- %c", *ap);
642 usage();
643 }
644 if ((nargv[0] = malloc(strlen(*argv) + 2 + 1)) == NULL)
645 err(1, NULL);
646 nargv[0][0] = '-';
647 nargv[0][1] = *ap;
648 strcpy(&nargv[0][2], *argv);
649 ++argv;
650 ++nargv;
651 break;
652 default:
653 if (!flags) {
654 *p++ = '-';
655 flags = 1;
656 }
657 *p++ = *ap;
658 break;
659 }
660 }
661
662 /* Terminate flags. */
663 if (flags) {
664 *p = '\0';
665 *nargv++ = flagsp;
666 }
667
668 /* Copy remaining arguments. */
669 while ((*nargv++ = *argv++));
670
671 /* Update argument count. */
672 *argcp = nargv - *argvp - 1;
673 }
674