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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //compat/linux/proc/self/root/usr/src/sbin/dump/main.c |
/*-
* Copyright (c) 1980, 1991, 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.
* 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 const char copyright[] =
"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c 8.6 (Berkeley) 5/1/95";
#endif
static const char rcsid[] =
"$FreeBSD: release/9.1.0/sbin/dump/main.c 217769 2011-01-24 06:17:05Z mckusick $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ffs/fs.h>
#include <protocols/dumprestore.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>
#include "dump.h"
#include "pathnames.h"
int notify = 0; /* notify operator flag */
int snapdump = 0; /* dumping live filesystem, so use snapshot */
int blockswritten = 0; /* number of blocks written on current tape */
int tapeno = 0; /* current tape number */
int density = 0; /* density in bytes/0.1" " <- this is for hilit19 */
int ntrec = NTREC; /* # tape blocks in each tape record */
int cartridge = 0; /* Assume non-cartridge tape */
int cachesize = 0; /* block cache size (in bytes), defaults to 0 */
long dev_bsize = 1; /* recalculated below */
long blocksperfile; /* output blocks per file */
char *host = NULL; /* remote host (if any) */
/*
* Possible superblock locations ordered from most to least likely.
*/
static int sblock_try[] = SBLOCKSEARCH;
static char *getmntpt(char *, int *);
static long numarg(const char *, long, long);
static void obsolete(int *, char **[]);
static void usage(void) __dead2;
int
main(int argc, char *argv[])
{
struct stat sb;
ino_t ino;
int dirty;
union dinode *dp;
struct fstab *dt;
char *map, *mntpt;
int ch, mode, mntflags;
int i, anydirskipped, bflag = 0, Tflag = 0, honorlevel = 1;
int just_estimate = 0;
ino_t maxino;
char *tmsg;
spcl.c_date = _time_to_time64(time(NULL));
tsize = 0; /* Default later, based on 'c' option for cart tapes */
dumpdates = _PATH_DUMPDATES;
popenout = NULL;
tape = NULL;
temp = _PATH_DTMP;
if (TP_BSIZE / DEV_BSIZE == 0 || TP_BSIZE % DEV_BSIZE != 0)
quit("TP_BSIZE must be a multiple of DEV_BSIZE\n");
level = 0;
rsync_friendly = 0;
if (argc < 2)
usage();
obsolete(&argc, &argv);
while ((ch = getopt(argc, argv,
"0123456789aB:b:C:cD:d:f:h:LnP:RrSs:T:uWw")) != -1)
switch (ch) {
/* dump level */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
level = 10 * level + ch - '0';
break;
case 'a': /* `auto-size', Write to EOM. */
unlimited = 1;
break;
case 'B': /* blocks per output file */
blocksperfile = numarg("number of blocks per file",
1L, 0L);
break;
case 'b': /* blocks per tape write */
ntrec = numarg("number of blocks per write",
1L, 1000L);
break;
case 'C':
cachesize = numarg("cachesize", 0, 0) * 1024 * 1024;
break;
case 'c': /* Tape is cart. not 9-track */
cartridge = 1;
break;
case 'D':
dumpdates = optarg;
break;
case 'd': /* density, in bits per inch */
density = numarg("density", 10L, 327670L) / 10;
if (density >= 625 && !bflag)
ntrec = HIGHDENSITYTREC;
break;
case 'f': /* output file */
if (popenout != NULL)
errx(X_STARTUP, "You cannot use the P and f "
"flags together.\n");
tape = optarg;
break;
case 'h':
honorlevel = numarg("honor level", 0L, 10L);
break;
case 'L':
snapdump = 1;
break;
case 'n': /* notify operators */
notify = 1;
break;
case 'P':
if (tape != NULL)
errx(X_STARTUP, "You cannot use the P and f "
"flags together.\n");
popenout = optarg;
break;
case 'r': /* store slightly less data to be friendly to rsync */
if (rsync_friendly < 1)
rsync_friendly = 1;
break;
case 'R': /* store even less data to be friendlier to rsync */
if (rsync_friendly < 2)
rsync_friendly = 2;
break;
case 'S': /* exit after estimating # of tapes */
just_estimate = 1;
break;
case 's': /* tape size, feet */
tsize = numarg("tape size", 1L, 0L) * 12 * 10;
break;
case 'T': /* time of last dump */
spcl.c_ddate = unctime(optarg);
if (spcl.c_ddate < 0) {
(void)fprintf(stderr, "bad time \"%s\"\n",
optarg);
exit(X_STARTUP);
}
Tflag = 1;
lastlevel = -1;
break;
case 'u': /* update /etc/dumpdates */
uflag = 1;
break;
case 'W': /* what to do */
case 'w':
lastdump(ch);
exit(X_FINOK); /* do nothing else */
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1) {
(void)fprintf(stderr, "Must specify disk or file system\n");
exit(X_STARTUP);
}
disk = *argv++;
argc--;
if (argc >= 1) {
(void)fprintf(stderr, "Unknown arguments to dump:");
while (argc--)
(void)fprintf(stderr, " %s", *argv++);
(void)fprintf(stderr, "\n");
exit(X_STARTUP);
}
if (rsync_friendly && (level > 0)) {
(void)fprintf(stderr, "%s %s\n", "rsync friendly options",
"can be used only with level 0 dumps.");
exit(X_STARTUP);
}
if (Tflag && uflag) {
(void)fprintf(stderr,
"You cannot use the T and u flags together.\n");
exit(X_STARTUP);
}
if (popenout) {
tape = "child pipeline process";
} else if (tape == NULL && (tape = getenv("TAPE")) == NULL)
tape = _PATH_DEFTAPE;
if (strcmp(tape, "-") == 0) {
pipeout++;
tape = "standard output";
}
if (blocksperfile)
blocksperfile = blocksperfile / ntrec * ntrec; /* round down */
else if (!unlimited) {
/*
* Determine how to default tape size and density
*
* density tape size
* 9-track 1600 bpi (160 bytes/.1") 2300 ft.
* 9-track 6250 bpi (625 bytes/.1") 2300 ft.
* cartridge 8000 bpi (100 bytes/.1") 1700 ft.
* (450*4 - slop)
* hilit19 hits again: "
*/
if (density == 0)
density = cartridge ? 100 : 160;
if (tsize == 0)
tsize = cartridge ? 1700L*120L : 2300L*120L;
}
if (strchr(tape, ':')) {
host = tape;
tape = strchr(host, ':');
*tape++ = '\0';
#ifdef RDUMP
if (index(tape, '\n')) {
(void)fprintf(stderr, "invalid characters in tape\n");
exit(X_STARTUP);
}
if (rmthost(host) == 0)
exit(X_STARTUP);
#else
(void)fprintf(stderr, "remote dump not enabled\n");
exit(X_STARTUP);
#endif
}
(void)setuid(getuid()); /* rmthost() is the only reason to be setuid */
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, sig);
if (signal(SIGTRAP, SIG_IGN) != SIG_IGN)
signal(SIGTRAP, sig);
if (signal(SIGFPE, SIG_IGN) != SIG_IGN)
signal(SIGFPE, sig);
if (signal(SIGBUS, SIG_IGN) != SIG_IGN)
signal(SIGBUS, sig);
if (signal(SIGSEGV, SIG_IGN) != SIG_IGN)
signal(SIGSEGV, sig);
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, sig);
if (signal(SIGINT, interrupt) == SIG_IGN)
signal(SIGINT, SIG_IGN);
dump_getfstab(); /* /etc/fstab snarfed */
/*
* disk can be either the full special file name,
* the suffix of the special file name,
* the special name missing the leading '/',
* the file system name with or without the leading '/'.
*/
dt = fstabsearch(disk);
if (dt != NULL) {
disk = rawname(dt->fs_spec);
if (disk == NULL)
errx(X_STARTUP, "%s: unknown file system", dt->fs_spec);
(void)strncpy(spcl.c_dev, dt->fs_spec, NAMELEN);
(void)strncpy(spcl.c_filesys, dt->fs_file, NAMELEN);
} else {
(void)strncpy(spcl.c_dev, disk, NAMELEN);
(void)strncpy(spcl.c_filesys, "an unlisted file system",
NAMELEN);
}
spcl.c_dev[NAMELEN-1]='\0';
spcl.c_filesys[NAMELEN-1]='\0';
if ((mntpt = getmntpt(disk, &mntflags)) != 0) {
if (mntflags & MNT_RDONLY) {
if (snapdump != 0) {
msg("WARNING: %s\n",
"-L ignored for read-only filesystem.");
snapdump = 0;
}
} else if (snapdump == 0) {
msg("WARNING: %s\n",
"should use -L when dumping live read-write "
"filesystems!");
} else {
char snapname[BUFSIZ], snapcmd[BUFSIZ];
snprintf(snapname, sizeof snapname, "%s/.snap", mntpt);
if ((stat(snapname, &sb) < 0) || !S_ISDIR(sb.st_mode)) {
msg("WARNING: %s %s\n",
"-L requested but snapshot location",
snapname);
msg(" %s: %s\n",
"is not a directory",
"dump downgraded, -L ignored");
snapdump = 0;
} else {
snprintf(snapname, sizeof snapname,
"%s/.snap/dump_snapshot", mntpt);
snprintf(snapcmd, sizeof snapcmd, "%s %s %s",
_PATH_MKSNAP_FFS, mntpt, snapname);
unlink(snapname);
if (system(snapcmd) != 0)
errx(X_STARTUP, "Cannot create %s: %s\n",
snapname, strerror(errno));
if ((diskfd = open(snapname, O_RDONLY)) < 0) {
unlink(snapname);
errx(X_STARTUP, "Cannot open %s: %s\n",
snapname, strerror(errno));
}
unlink(snapname);
if (fstat(diskfd, &sb) != 0)
err(X_STARTUP, "%s: stat", snapname);
spcl.c_date = _time_to_time64(sb.st_mtime);
}
}
} else if (snapdump != 0) {
msg("WARNING: Cannot use -L on an unmounted filesystem.\n");
snapdump = 0;
}
if (snapdump == 0) {
if ((diskfd = open(disk, O_RDONLY)) < 0)
err(X_STARTUP, "Cannot open %s", disk);
if (fstat(diskfd, &sb) != 0)
err(X_STARTUP, "%s: stat", disk);
if (S_ISDIR(sb.st_mode))
errx(X_STARTUP, "%s: unknown file system", disk);
}
(void)strcpy(spcl.c_label, "none");
(void)gethostname(spcl.c_host, NAMELEN);
spcl.c_level = level;
spcl.c_type = TS_TAPE;
if (rsync_friendly) {
/* don't store real dump times */
spcl.c_date = 0;
spcl.c_ddate = 0;
}
if (spcl.c_date == 0) {
tmsg = "the epoch\n";
} else {
time_t t = _time64_to_time(spcl.c_date);
tmsg = ctime(&t);
}
msg("Date of this level %d dump: %s", level, tmsg);
if (!Tflag && (!rsync_friendly))
getdumptime(); /* /etc/dumpdates snarfed */
if (spcl.c_ddate == 0) {
tmsg = "the epoch\n";
} else {
time_t t = _time64_to_time(spcl.c_ddate);
tmsg = ctime(&t);
}
if (lastlevel < 0)
msg("Date of last (level unknown) dump: %s", tmsg);
else
msg("Date of last level %d dump: %s", lastlevel, tmsg);
msg("Dumping %s%s ", snapdump ? "snapshot of ": "", disk);
if (dt != NULL)
msgtail("(%s) ", dt->fs_file);
if (host)
msgtail("to %s on host %s\n", tape, host);
else
msgtail("to %s\n", tape);
sync();
sblock = (struct fs *)sblock_buf;
for (i = 0; sblock_try[i] != -1; i++) {
sblock->fs_fsize = SBLOCKSIZE; /* needed in bread */
bread(sblock_try[i] >> dev_bshift, (char *) sblock, SBLOCKSIZE);
if ((sblock->fs_magic == FS_UFS1_MAGIC ||
(sblock->fs_magic == FS_UFS2_MAGIC &&
sblock->fs_sblockloc == sblock_try[i])) &&
sblock->fs_bsize <= MAXBSIZE &&
sblock->fs_bsize >= sizeof(struct fs))
break;
}
if (sblock_try[i] == -1)
quit("Cannot find file system superblock\n");
dev_bsize = sblock->fs_fsize / fsbtodb(sblock, 1);
dev_bshift = ffs(dev_bsize) - 1;
if (dev_bsize != (1 << dev_bshift))
quit("dev_bsize (%ld) is not a power of 2", dev_bsize);
tp_bshift = ffs(TP_BSIZE) - 1;
if (TP_BSIZE != (1 << tp_bshift))
quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE);
maxino = sblock->fs_ipg * sblock->fs_ncg;
mapsize = roundup(howmany(maxino, CHAR_BIT), TP_BSIZE);
usedinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
dumpdirmap = (char *)calloc((unsigned) mapsize, sizeof(char));
dumpinomap = (char *)calloc((unsigned) mapsize, sizeof(char));
tapesize = 3 * (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
nonodump = spcl.c_level < honorlevel;
passno = 1;
setproctitle("%s: pass 1: regular files", disk);
msg("mapping (Pass I) [regular files]\n");
anydirskipped = mapfiles(maxino, &tapesize);
passno = 2;
setproctitle("%s: pass 2: directories", disk);
msg("mapping (Pass II) [directories]\n");
while (anydirskipped) {
anydirskipped = mapdirs(maxino, &tapesize);
}
if (pipeout || unlimited) {
tapesize += 10; /* 10 trailer blocks */
msg("estimated %ld tape blocks.\n", tapesize);
} else {
double fetapes;
if (blocksperfile)
fetapes = (double) tapesize / blocksperfile;
else if (cartridge) {
/* Estimate number of tapes, assuming streaming stops at
the end of each block written, and not in mid-block.
Assume no erroneous blocks; this can be compensated
for with an artificially low tape size. */
fetapes =
( (double) tapesize /* blocks */
* TP_BSIZE /* bytes/block */
* (1.0/density) /* 0.1" / byte " */
+
(double) tapesize /* blocks */
* (1.0/ntrec) /* streaming-stops per block */
* 15.48 /* 0.1" / streaming-stop " */
) * (1.0 / tsize ); /* tape / 0.1" " */
} else {
/* Estimate number of tapes, for old fashioned 9-track
tape */
int tenthsperirg = (density == 625) ? 3 : 7;
fetapes =
( (double) tapesize /* blocks */
* TP_BSIZE /* bytes / block */
* (1.0/density) /* 0.1" / byte " */
+
(double) tapesize /* blocks */
* (1.0/ntrec) /* IRG's / block */
* tenthsperirg /* 0.1" / IRG " */
) * (1.0 / tsize ); /* tape / 0.1" " */
}
etapes = fetapes; /* truncating assignment */
etapes++;
/* count the dumped inodes map on each additional tape */
tapesize += (etapes - 1) *
(howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
tapesize += etapes + 10; /* headers + 10 trailer blks */
msg("estimated %ld tape blocks on %3.2f tape(s).\n",
tapesize, fetapes);
}
/*
* If the user only wants an estimate of the number of
* tapes, exit now.
*/
if (just_estimate)
exit(0);
/*
* Allocate tape buffer.
*/
if (!alloctape())
quit(
"can't allocate tape buffers - try a smaller blocking factor.\n");
startnewtape(1);
(void)time((time_t *)&(tstart_writing));
dumpmap(usedinomap, TS_CLRI, maxino - 1);
passno = 3;
setproctitle("%s: pass 3: directories", disk);
msg("dumping (Pass III) [directories]\n");
dirty = 0; /* XXX just to get gcc to shut up */
for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
if (((ino - 1) % CHAR_BIT) == 0) /* map is offset by 1 */
dirty = *map++;
else
dirty >>= 1;
if ((dirty & 1) == 0)
continue;
/*
* Skip directory inodes deleted and maybe reallocated
*/
dp = getino(ino, &mode);
if (mode != IFDIR)
continue;
(void)dumpino(dp, ino);
}
passno = 4;
setproctitle("%s: pass 4: regular files", disk);
msg("dumping (Pass IV) [regular files]\n");
for (map = dumpinomap, ino = 1; ino < maxino; ino++) {
if (((ino - 1) % CHAR_BIT) == 0) /* map is offset by 1 */
dirty = *map++;
else
dirty >>= 1;
if ((dirty & 1) == 0)
continue;
/*
* Skip inodes deleted and reallocated as directories.
*/
dp = getino(ino, &mode);
if (mode == IFDIR)
continue;
(void)dumpino(dp, ino);
}
(void)time((time_t *)&(tend_writing));
spcl.c_type = TS_END;
for (i = 0; i < ntrec; i++)
writeheader(maxino - 1);
if (pipeout)
msg("DUMP: %jd tape blocks\n", (intmax_t)spcl.c_tapea);
else
msg("DUMP: %jd tape blocks on %d volume%s\n",
(intmax_t)spcl.c_tapea, spcl.c_volume,
(spcl.c_volume == 1) ? "" : "s");
/* report dump performance, avoid division through zero */
if (tend_writing - tstart_writing == 0)
msg("finished in less than a second\n");
else
msg("finished in %jd seconds, throughput %jd KBytes/sec\n",
(intmax_t)tend_writing - tstart_writing,
(intmax_t)(spcl.c_tapea /
(tend_writing - tstart_writing)));
putdumptime();
trewind();
broadcast("DUMP IS DONE!\a\a\n");
msg("DUMP IS DONE\n");
Exit(X_FINOK);
/* NOTREACHED */
}
static void
usage(void)
{
fprintf(stderr,
"usage: dump [-0123456789acLnSu] [-B records] [-b blocksize] [-C cachesize]\n"
" [-D dumpdates] [-d density] [-f file | -P pipecommand] [-h level]\n"
" [-s feet] [-T date] filesystem\n"
" dump -W | -w\n");
exit(X_STARTUP);
}
/*
* Check to see if a disk is currently mounted.
*/
static char *
getmntpt(char *name, int *mntflagsp)
{
long mntsize, i;
struct statfs *mntbuf;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
if (!strcmp(mntbuf[i].f_mntfromname, name)) {
*mntflagsp = mntbuf[i].f_flags;
return (mntbuf[i].f_mntonname);
}
}
return (0);
}
/*
* Pick up a numeric argument. It must be nonnegative and in the given
* range (except that a vmax of 0 means unlimited).
*/
static long
numarg(const char *meaning, long vmin, long vmax)
{
char *p;
long val;
val = strtol(optarg, &p, 10);
if (*p)
errx(1, "illegal %s -- %s", meaning, optarg);
if (val < vmin || (vmax && val > vmax))
errx(1, "%s must be between %ld and %ld", meaning, vmin, vmax);
return (val);
}
void
sig(int signo)
{
switch(signo) {
case SIGALRM:
case SIGBUS:
case SIGFPE:
case SIGHUP:
case SIGTERM:
case SIGTRAP:
if (pipeout)
quit("Signal on pipe: cannot recover\n");
msg("Rewriting attempted as response to unknown signal.\n");
(void)fflush(stderr);
(void)fflush(stdout);
close_rewind();
exit(X_REWRITE);
/* NOTREACHED */
case SIGSEGV:
msg("SIGSEGV: ABORTING!\n");
(void)signal(SIGSEGV, SIG_DFL);
(void)kill(0, SIGSEGV);
/* NOTREACHED */
}
}
char *
rawname(char *cp)
{
struct stat sb;
/*
* Ensure that the device passed in is a raw device.
*/
if (stat(cp, &sb) == 0 && (sb.st_mode & S_IFMT) == S_IFCHR)
return (cp);
/*
* Since there's only one device type now, we can't construct any
* better name, so we have to return NULL.
*/
return (NULL);
}
/*
* obsolete --
* Change set of key letters and ordered arguments into something
* getopt(3) will like.
*/
static void
obsolete(int *argcp, char **argvp[])
{
int argc, flags;
char *ap, **argv, *flagsp, **nargv, *p;
/* Setup. */
argv = *argvp;
argc = *argcp;
/*
* Return if no arguments or first argument has leading
* dash or slash.
*/
ap = argv[1];
if (argc == 1 || *ap == '-' || *ap == '/')
return;
/* Allocate space for new arguments. */
if ((*argvp = nargv = malloc((argc + 1) * sizeof(char *))) == NULL ||
(p = flagsp = malloc(strlen(ap) + 2)) == NULL)
err(1, NULL);
*nargv++ = *argv;
argv += 2;
for (flags = 0; *ap; ++ap) {
switch (*ap) {
case 'B':
case 'b':
case 'd':
case 'f':
case 'D':
case 'C':
case 'h':
case 's':
case 'T':
if (*argv == NULL) {
warnx("option requires an argument -- %c", *ap);
usage();
}
if ((nargv[0] = malloc(strlen(*argv) + 2 + 1)) == NULL)
err(1, NULL);
nargv[0][0] = '-';
nargv[0][1] = *ap;
(void)strcpy(&nargv[0][2], *argv);
++argv;
++nargv;
break;
default:
if (!flags) {
*p++ = '-';
flags = 1;
}
*p++ = *ap;
break;
}
}
/* Terminate flags. */
if (flags) {
*p = '\0';
*nargv++ = flagsp;
} else
free(flagsp);
/* Copy remaining arguments. */
while ((*nargv++ = *argv++));
/* Update argument count. */
*argcp = nargv - *argvp - 1;
}